From 4600af055566854e6e59f54d1c45914d36ca19d5 Mon Sep 17 00:00:00 2001
From: NozomuIkuta <NozomuIkuta@users.noreply.github.com>
Date: Mon, 27 Nov 2023 02:56:39 +0000
Subject: [PATCH] deploy: d325ce16c9bf90b9c6493a416bb791d67ea0d2df

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diff --git a/assets/blog_2022-08-08-linter-research.md.7364aab2.lean.js b/assets/blog_2022-08-08-linter-research.md.2f4287c0.js
similarity index 89%
rename from assets/blog_2022-08-08-linter-research.md.7364aab2.lean.js
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similarity index 89%
rename from assets/blog_2022-08-08-linter-research.md.7364aab2.js
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diff --git a/assets/blog_2023-11-07-announcing-oxc.md.3a2f4a1d.js b/assets/blog_2023-11-07-announcing-oxc.md.899bda23.js
similarity index 88%
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+++ b/assets/blog_2023-11-07-announcing-oxc.md.899bda23.js
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-import{_ as e,C as o,o as t,c as a,H as c}from"./chunks/framework.725e5b03.js";const m=JSON.parse('{"title":"Announcing Oxc","description":"","frontmatter":{"title":"Announcing Oxc","outline":"deep","authors":["boshen"]},"headers":[],"relativePath":"blog/2023-11-07-announcing-oxc.md","filePath":"blog/2023-11-07-announcing-oxc.md","lastUpdated":1701052174000}'),s={name:"blog/2023-11-07-announcing-oxc.md"};function r(p,i,l,d,_,u){const n=o("AppBlogPostHeader");return t(),a("div",null,[c(n)])}const x=e(s,[["render",r]]);export{m as __pageData,x as default};
+import{_ as e,C as o,o as t,c as a,H as c}from"./chunks/framework.725e5b03.js";const m=JSON.parse('{"title":"Announcing Oxc","description":"","frontmatter":{"title":"Announcing Oxc","outline":"deep","authors":["boshen"]},"headers":[],"relativePath":"blog/2023-11-07-announcing-oxc.md","filePath":"blog/2023-11-07-announcing-oxc.md","lastUpdated":1701053760000}'),s={name:"blog/2023-11-07-announcing-oxc.md"};function r(p,i,l,d,_,u){const n=o("AppBlogPostHeader");return t(),a("div",null,[c(n)])}const x=e(s,[["render",r]]);export{m as __pageData,x as default};
diff --git a/assets/blog_2023-11-07-announcing-oxc.md.3a2f4a1d.lean.js b/assets/blog_2023-11-07-announcing-oxc.md.899bda23.lean.js
similarity index 88%
rename from assets/blog_2023-11-07-announcing-oxc.md.3a2f4a1d.lean.js
rename to assets/blog_2023-11-07-announcing-oxc.md.899bda23.lean.js
index bf1ecc281c..a56b0c187f 100644
--- a/assets/blog_2023-11-07-announcing-oxc.md.3a2f4a1d.lean.js
+++ b/assets/blog_2023-11-07-announcing-oxc.md.899bda23.lean.js
@@ -1 +1 @@
-import{_ as e,C as o,o as t,c as a,H as c}from"./chunks/framework.725e5b03.js";const m=JSON.parse('{"title":"Announcing Oxc","description":"","frontmatter":{"title":"Announcing Oxc","outline":"deep","authors":["boshen"]},"headers":[],"relativePath":"blog/2023-11-07-announcing-oxc.md","filePath":"blog/2023-11-07-announcing-oxc.md","lastUpdated":1701052174000}'),s={name:"blog/2023-11-07-announcing-oxc.md"};function r(p,i,l,d,_,u){const n=o("AppBlogPostHeader");return t(),a("div",null,[c(n)])}const x=e(s,[["render",r]]);export{m as __pageData,x as default};
+import{_ as e,C as o,o as t,c as a,H as c}from"./chunks/framework.725e5b03.js";const m=JSON.parse('{"title":"Announcing Oxc","description":"","frontmatter":{"title":"Announcing Oxc","outline":"deep","authors":["boshen"]},"headers":[],"relativePath":"blog/2023-11-07-announcing-oxc.md","filePath":"blog/2023-11-07-announcing-oxc.md","lastUpdated":1701053760000}'),s={name:"blog/2023-11-07-announcing-oxc.md"};function r(p,i,l,d,_,u){const n=o("AppBlogPostHeader");return t(),a("div",null,[c(n)])}const x=e(s,[["render",r]]);export{m as __pageData,x as default};
diff --git a/assets/blog_2023-11-08-announcing-oxlint.md.706d95fb.js b/assets/blog_2023-11-08-announcing-oxlint.md.9976ed49.js
similarity index 89%
rename from assets/blog_2023-11-08-announcing-oxlint.md.706d95fb.js
rename to assets/blog_2023-11-08-announcing-oxlint.md.9976ed49.js
index cdab496c42..d5dcd9e226 100644
--- a/assets/blog_2023-11-08-announcing-oxlint.md.706d95fb.js
+++ b/assets/blog_2023-11-08-announcing-oxlint.md.9976ed49.js
@@ -1 +1 @@
-import{_ as n,C as t,o,c as a,H as l}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Oxlint General Availability","description":"","frontmatter":{"title":"Oxlint General Availability","outline":"deep","authors":["boshen"]},"headers":[],"relativePath":"blog/2023-11-08-announcing-oxlint.md","filePath":"blog/2023-11-08-announcing-oxlint.md","lastUpdated":1701052174000}'),i={name:"blog/2023-11-08-announcing-oxlint.md"};function r(s,c,p,d,_,m){const e=t("AppBlogPostHeader");return o(),a("div",null,[l(e)])}const x=n(i,[["render",r]]);export{g as __pageData,x as default};
+import{_ as n,C as t,o,c as a,H as l}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Oxlint General Availability","description":"","frontmatter":{"title":"Oxlint General Availability","outline":"deep","authors":["boshen"]},"headers":[],"relativePath":"blog/2023-11-08-announcing-oxlint.md","filePath":"blog/2023-11-08-announcing-oxlint.md","lastUpdated":1701053760000}'),i={name:"blog/2023-11-08-announcing-oxlint.md"};function r(s,c,p,d,_,m){const e=t("AppBlogPostHeader");return o(),a("div",null,[l(e)])}const x=n(i,[["render",r]]);export{g as __pageData,x as default};
diff --git a/assets/blog_2023-11-08-announcing-oxlint.md.706d95fb.lean.js b/assets/blog_2023-11-08-announcing-oxlint.md.9976ed49.lean.js
similarity index 89%
rename from assets/blog_2023-11-08-announcing-oxlint.md.706d95fb.lean.js
rename to assets/blog_2023-11-08-announcing-oxlint.md.9976ed49.lean.js
index cdab496c42..d5dcd9e226 100644
--- a/assets/blog_2023-11-08-announcing-oxlint.md.706d95fb.lean.js
+++ b/assets/blog_2023-11-08-announcing-oxlint.md.9976ed49.lean.js
@@ -1 +1 @@
-import{_ as n,C as t,o,c as a,H as l}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Oxlint General Availability","description":"","frontmatter":{"title":"Oxlint General Availability","outline":"deep","authors":["boshen"]},"headers":[],"relativePath":"blog/2023-11-08-announcing-oxlint.md","filePath":"blog/2023-11-08-announcing-oxlint.md","lastUpdated":1701052174000}'),i={name:"blog/2023-11-08-announcing-oxlint.md"};function r(s,c,p,d,_,m){const e=t("AppBlogPostHeader");return o(),a("div",null,[l(e)])}const x=n(i,[["render",r]]);export{g as __pageData,x as default};
+import{_ as n,C as t,o,c as a,H as l}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Oxlint General Availability","description":"","frontmatter":{"title":"Oxlint General Availability","outline":"deep","authors":["boshen"]},"headers":[],"relativePath":"blog/2023-11-08-announcing-oxlint.md","filePath":"blog/2023-11-08-announcing-oxlint.md","lastUpdated":1701053760000}'),i={name:"blog/2023-11-08-announcing-oxlint.md"};function r(s,c,p,d,_,m){const e=t("AppBlogPostHeader");return o(),a("div",null,[l(e)])}const x=n(i,[["render",r]]);export{g as __pageData,x as default};
diff --git a/assets/blog_index.md.a20bd3b9.js b/assets/blog_index.md.e44a5676.js
similarity index 99%
rename from assets/blog_index.md.a20bd3b9.js
rename to assets/blog_index.md.e44a5676.js
index 445dea1311..7edac1e0ab 100644
--- a/assets/blog_index.md.a20bd3b9.js
+++ b/assets/blog_index.md.e44a5676.js
@@ -1,4 +1,4 @@
-import{_ as e,o as a,c as r,Q as s}from"./chunks/framework.725e5b03.js";const m=JSON.parse('{"title":"","description":"","frontmatter":{"outline":"deep"},"headers":[],"relativePath":"blog/index.md","filePath":"blog/index.md","lastUpdated":1701052174000}'),t={name:"blog/index.md"},o=s(`<p><a href="https://github.com/rome/tools" target="_blank" rel="noreferrer">Rome</a> uses a different set of techniques for parsing JavaScript and TypeScript. This tutorial summarizes them in learning order for better understanding.</p><h2 id="history" tabindex="-1">History <a class="header-anchor" href="#history" aria-label="Permalink to &quot;History&quot;">​</a></h2><ul><li>The Rome codebase was rewritten from TypeScript to Rust, see <a href="https://rome.tools/blog/2021/09/21/rome-will-be-rewritten-in-rust" target="_blank" rel="noreferrer">Rome will be rewritten in Rust</a></li><li>The decision was made after talking to the author of <a href="https://github.com/rslint/rslint" target="_blank" rel="noreferrer">rslint</a> and <a href="https://github.com/rust-lang/rust-analyzer" target="_blank" rel="noreferrer">rust-analyzer</a></li><li>rust-analyzer proved that IDE-centric tools built around concrete syntax tree are possible</li><li>rslint proved that it is possible to write a JavaScript parser in Rust, with the same base libraries as rust-analyzer</li><li>Rome ported the rslint codebase to their own repo with permission from rslint&#39;s author</li></ul><h2 id="concrete-syntax-tree" tabindex="-1">Concrete Syntax Tree <a class="header-anchor" href="#concrete-syntax-tree" aria-label="Permalink to &quot;Concrete Syntax Tree&quot;">​</a></h2><ul><li>The base library is called <a href="https://github.com/rust-analyzer/rowan" target="_blank" rel="noreferrer">rowan</a>, see <a href="https://github.com/rust-lang/rust-analyzer/blob/master/docs/dev/syntax.md" target="_blank" rel="noreferrer">overview of rowan</a></li><li>Rowan, also known as red-green trees, is named after the real green <a href="https://en.wikipedia.org/wiki/Rowan" target="_blank" rel="noreferrer">rowan tree</a> that makes red berries</li><li>The origin of red-green trees is described in this <a href="https://ericlippert.com/2012/06/08/red-green-trees/" target="_blank" rel="noreferrer">blog post</a>, by the authors of the C# programming language</li><li>The whole point of rowan is to define a lossless concrete syntax tree (CST) that describes all the details of the source code and provides a set of traversal APIs (parent, children, siblings, etc)</li><li>Read the advantage of having a CST over an AST: <a href="https://rdambrosio016.github.io/rust/2020/09/18/pure-ast-based-linting-sucks.html" target="_blank" rel="noreferrer">Pure AST based linting sucks</a></li><li>CST provides the ability to build a fully recoverable parser</li></ul><h2 id="grammar" tabindex="-1">Grammar <a class="header-anchor" href="#grammar" aria-label="Permalink to &quot;Grammar&quot;">​</a></h2><ul><li>Just like an AST, we need to define the grammar. The grammar is auto-generated by using <a href="https://github.com/rome/tools/tree/main/xtask/codegen" target="_blank" rel="noreferrer">xtask/codegen</a></li><li>The grammar is generated from the <a href="https://github.com/rust-analyzer/ungrammar" target="_blank" rel="noreferrer">ungrammar</a> DSL</li><li>The input <code>ungrammar</code> source file is in <a href="https://github.com/rome/tools/blob/main/xtask/codegen/js.ungram" target="_blank" rel="noreferrer">xtask/codegen/js.ungram</a></li><li>The output of the codegen is in <a href="https://github.com/rome/tools/tree/main/crates/rome_js_syntax/src/generated" target="_blank" rel="noreferrer">rome_js_syntax/src/generated</a></li></ul><h2 id="entry-point" tabindex="-1">Entry Point <a class="header-anchor" href="#entry-point" aria-label="Permalink to &quot;Entry Point&quot;">​</a></h2><p>The Rome codebase is getting large and slightly difficult to find the parser entry point.</p><p>For first-time contributors, the <code>rome_cli</code> crate is the binary entry point for running the code:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span></span>
+import{_ as e,o as a,c as r,Q as s}from"./chunks/framework.725e5b03.js";const m=JSON.parse('{"title":"","description":"","frontmatter":{"outline":"deep"},"headers":[],"relativePath":"blog/index.md","filePath":"blog/index.md","lastUpdated":1701053760000}'),t={name:"blog/index.md"},o=s(`<p><a href="https://github.com/rome/tools" target="_blank" rel="noreferrer">Rome</a> uses a different set of techniques for parsing JavaScript and TypeScript. This tutorial summarizes them in learning order for better understanding.</p><h2 id="history" tabindex="-1">History <a class="header-anchor" href="#history" aria-label="Permalink to &quot;History&quot;">​</a></h2><ul><li>The Rome codebase was rewritten from TypeScript to Rust, see <a href="https://rome.tools/blog/2021/09/21/rome-will-be-rewritten-in-rust" target="_blank" rel="noreferrer">Rome will be rewritten in Rust</a></li><li>The decision was made after talking to the author of <a href="https://github.com/rslint/rslint" target="_blank" rel="noreferrer">rslint</a> and <a href="https://github.com/rust-lang/rust-analyzer" target="_blank" rel="noreferrer">rust-analyzer</a></li><li>rust-analyzer proved that IDE-centric tools built around concrete syntax tree are possible</li><li>rslint proved that it is possible to write a JavaScript parser in Rust, with the same base libraries as rust-analyzer</li><li>Rome ported the rslint codebase to their own repo with permission from rslint&#39;s author</li></ul><h2 id="concrete-syntax-tree" tabindex="-1">Concrete Syntax Tree <a class="header-anchor" href="#concrete-syntax-tree" aria-label="Permalink to &quot;Concrete Syntax Tree&quot;">​</a></h2><ul><li>The base library is called <a href="https://github.com/rust-analyzer/rowan" target="_blank" rel="noreferrer">rowan</a>, see <a href="https://github.com/rust-lang/rust-analyzer/blob/master/docs/dev/syntax.md" target="_blank" rel="noreferrer">overview of rowan</a></li><li>Rowan, also known as red-green trees, is named after the real green <a href="https://en.wikipedia.org/wiki/Rowan" target="_blank" rel="noreferrer">rowan tree</a> that makes red berries</li><li>The origin of red-green trees is described in this <a href="https://ericlippert.com/2012/06/08/red-green-trees/" target="_blank" rel="noreferrer">blog post</a>, by the authors of the C# programming language</li><li>The whole point of rowan is to define a lossless concrete syntax tree (CST) that describes all the details of the source code and provides a set of traversal APIs (parent, children, siblings, etc)</li><li>Read the advantage of having a CST over an AST: <a href="https://rdambrosio016.github.io/rust/2020/09/18/pure-ast-based-linting-sucks.html" target="_blank" rel="noreferrer">Pure AST based linting sucks</a></li><li>CST provides the ability to build a fully recoverable parser</li></ul><h2 id="grammar" tabindex="-1">Grammar <a class="header-anchor" href="#grammar" aria-label="Permalink to &quot;Grammar&quot;">​</a></h2><ul><li>Just like an AST, we need to define the grammar. The grammar is auto-generated by using <a href="https://github.com/rome/tools/tree/main/xtask/codegen" target="_blank" rel="noreferrer">xtask/codegen</a></li><li>The grammar is generated from the <a href="https://github.com/rust-analyzer/ungrammar" target="_blank" rel="noreferrer">ungrammar</a> DSL</li><li>The input <code>ungrammar</code> source file is in <a href="https://github.com/rome/tools/blob/main/xtask/codegen/js.ungram" target="_blank" rel="noreferrer">xtask/codegen/js.ungram</a></li><li>The output of the codegen is in <a href="https://github.com/rome/tools/tree/main/crates/rome_js_syntax/src/generated" target="_blank" rel="noreferrer">rome_js_syntax/src/generated</a></li></ul><h2 id="entry-point" tabindex="-1">Entry Point <a class="header-anchor" href="#entry-point" aria-label="Permalink to &quot;Entry Point&quot;">​</a></h2><p>The Rome codebase is getting large and slightly difficult to find the parser entry point.</p><p>For first-time contributors, the <code>rome_cli</code> crate is the binary entry point for running the code:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span></span>
 <span class="line"></span>
 <span class="line"><span style="color:#B392F0;">touch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">test.js</span></span>
 <span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">check</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">./test.js</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">rome_cli</span></span>
diff --git a/assets/blog_index.md.a20bd3b9.lean.js b/assets/blog_index.md.e44a5676.lean.js
similarity index 84%
rename from assets/blog_index.md.a20bd3b9.lean.js
rename to assets/blog_index.md.e44a5676.lean.js
index 5b253e3923..8a512c3f9e 100644
--- a/assets/blog_index.md.a20bd3b9.lean.js
+++ b/assets/blog_index.md.e44a5676.lean.js
@@ -1 +1 @@
-import{_ as e,o as a,c as r,Q as s}from"./chunks/framework.725e5b03.js";const m=JSON.parse('{"title":"","description":"","frontmatter":{"outline":"deep"},"headers":[],"relativePath":"blog/index.md","filePath":"blog/index.md","lastUpdated":1701052174000}'),t={name:"blog/index.md"},o=s("",18),n=[o];function l(i,p,c,h,d,b){return a(),r("div",null,n)}const u=e(t,[["render",l]]);export{m as __pageData,u as default};
+import{_ as e,o as a,c as r,Q as s}from"./chunks/framework.725e5b03.js";const m=JSON.parse('{"title":"","description":"","frontmatter":{"outline":"deep"},"headers":[],"relativePath":"blog/index.md","filePath":"blog/index.md","lastUpdated":1701053760000}'),t={name:"blog/index.md"},o=s("",18),n=[o];function l(i,p,c,h,d,b){return a(),r("div",null,n)}const u=e(t,[["render",l]]);export{m as __pageData,u as default};
diff --git a/assets/chunks/@localSearchIndexja.fe90f88e.js b/assets/chunks/@localSearchIndexja.fe90f88e.js
new file mode 100644
index 0000000000..dca819f9c4
--- /dev/null
+++ b/assets/chunks/@localSearchIndexja.fe90f88e.js
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this._currentVacuum!=null},enumerable:!1,configurable:!0}),Object.defineProperty(o.prototype,"dirtCount",{get:function(){return this._dirtCount},enumerable:!1,configurable:!0}),Object.defineProperty(o.prototype,"dirtFactor",{get:function(){return this._dirtCount/(1+this._documentCount+this._dirtCount)},enumerable:!1,configurable:!0}),o.prototype.has=function(e){return this._idToShortId.has(e)},o.prototype.getStoredFields=function(e){var t=this._idToShortId.get(e);if(t!=null)return this._storedFields.get(t)},o.prototype.search=function(e,t){var r,n;t===void 0&&(t={});var a=this.executeQuery(e,t),i=[];try{for(var s=D(a),u=s.next();!u.done;u=s.next()){var l=K(u.value,2),d=l[0],h=l[1],v=h.score,y=h.terms,b=h.match,S=y.length||1,g={id:this._documentIds.get(d),score:v*S,terms:Object.keys(b),match:b};Object.assign(g,this._storedFields.get(d)),(t.filter==null||t.filter(g))&&i.push(g)}}catch(A){r={error:A}}finally{try{u&&!u.done&&(n=s.return)&&n.call(s)}finally{if(r)throw r.error}}return 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V=K(R.value,2),k=V[0],O=V[1];F._idToShortId.set(O,k)}}catch(z){r={error:z}}finally{try{R&&!R.done&&(n=L.return)&&n.call(L)}finally{if(r)throw r.error}}try{for(var C=D(l),_=C.next();!_.done;_=C.next()){var w=K(_.value,2),c=w[0],f=w[1],p=new Map;try{for(var N=(s=void 0,D(Object.keys(f))),I=N.next();!I.done;I=N.next()){var M=I.value,P=f[M];T===1&&(P=P.ds),p.set(parseInt(M,10),Ce(P))}}catch(z){s={error:z}}finally{try{I&&!I.done&&(u=N.return)&&u.call(N)}finally{if(s)throw s.error}}F._index.set(c,p)}}catch(z){a={error:z}}finally{try{_&&!_.done&&(i=C.return)&&i.call(C)}finally{if(a)throw a.error}}return F},o.prototype.executeQuery=function(e,t){var r=this;if(t===void 0&&(t={}),e===o.wildcard)return this.executeWildcardQuery(t);if(typeof e!="string"){var n=W(W(W({},t),e),{queries:void 0}),a=e.queries.map(function(g){return r.executeQuery(g,n)});return this.combineResults(a,n.combineWith)}var 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_.error}}}}catch(f){O={error:f}}finally{try{y&&!y.done&&(C=v.return)&&C.call(v)}finally{if(O)throw O.error}}return this._index.get(d).size===0&&this._index.delete(d),i%n!==0?[3,4]:[4,new Promise(function(f){return setTimeout(f,a)})];case 3:c.sent(),c.label=4;case 4:i+=1,c.label=5;case 5:return u=s.next(),[3,2];case 6:return[3,9];case 7:return R=c.sent(),V={error:R},[3,9];case 8:try{u&&!u.done&&(k=s.return)&&k.call(s)}finally{if(V)throw V.error}return[7];case 9:this._dirtCount-=r,c.label=10;case 10:return[4,null];case 11:return c.sent(),this._currentVacuum=this._enqueuedVacuum,this._enqueuedVacuum=null,[2]}})})},o.prototype.vacuumConditionsMet=function(e){if(e==null)return!0;var t=e.minDirtCount,r=e.minDirtFactor;return t=t||Be.minDirtCount,r=r||Be.minDirtFactor,this.dirtCount>=t&&this.dirtFactor>=r},Object.defineProperty(o.prototype,"isVacuuming",{get:function(){return this._currentVacuum!=null},enumerable:!1,configurable:!0}),Object.defineProperty(o.prototype,"dirtCount",{get:function(){return this._dirtCount},enumerable:!1,configurable:!0}),Object.defineProperty(o.prototype,"dirtFactor",{get:function(){return this._dirtCount/(1+this._documentCount+this._dirtCount)},enumerable:!1,configurable:!0}),o.prototype.has=function(e){return this._idToShortId.has(e)},o.prototype.getStoredFields=function(e){var t=this._idToShortId.get(e);if(t!=null)return this._storedFields.get(t)},o.prototype.search=function(e,t){var r,n;t===void 0&&(t={});var a=this.executeQuery(e,t),i=[];try{for(var s=D(a),u=s.next();!u.done;u=s.next()){var l=K(u.value,2),d=l[0],h=l[1],v=h.score,y=h.terms,b=h.match,S=y.length||1,g={id:this._documentIds.get(d),score:v*S,terms:Object.keys(b),match:b};Object.assign(g,this._storedFields.get(d)),(t.filter==null||t.filter(g))&&i.push(g)}}catch(A){r={error:A}}finally{try{u&&!u.done&&(n=s.return)&&n.call(s)}finally{if(r)throw r.error}}return e===o.wildcard&&t.boostDocument==null&&this._options.searchOptions.boostDocument==null||i.sort(vt),i},o.prototype.autoSuggest=function(e,t){var r,n,a,i;t===void 0&&(t={}),t=W(W({},this._options.autoSuggestOptions),t);var s=new Map;try{for(var u=D(this.search(e,t)),l=u.next();!l.done;l=u.next()){var d=l.value,h=d.score,v=d.terms,y=v.join(" "),b=s.get(y);b!=null?(b.score+=h,b.count+=1):s.set(y,{score:h,terms:v,count:1})}}catch(R){r={error:R}}finally{try{l&&!l.done&&(n=u.return)&&n.call(u)}finally{if(r)throw r.error}}var S=[];try{for(var g=D(s),A=g.next();!A.done;A=g.next()){var T=K(A.value,2),b=T[0],F=T[1],h=F.score,v=F.terms,L=F.count;S.push({suggestion:b,terms:v,score:h/L})}}catch(R){a={error:R}}finally{try{A&&!A.done&&(i=g.return)&&i.call(g)}finally{if(a)throw a.error}}return S.sort(vt),S},Object.defineProperty(o.prototype,"documentCount",{get:function(){return this._documentCount},enumerable:!1,configurable:!0}),Object.defineProperty(o.prototype,"termCount",{get:function(){return this._index.size},enumerable:!1,configurable:!0}),o.loadJSON=function(e,t){if(t==null)throw new Error("MiniSearch: loadJSON should be given the same options used when serializing the index");return this.loadJS(JSON.parse(e),t)},o.getDefault=function(e){if(ze.hasOwnProperty(e))return Pe(ze,e);throw new Error('MiniSearch: unknown option "'.concat(e,'"'))},o.loadJS=function(e,t){var r,n,a,i,s,u,l=e.index,d=e.documentCount,h=e.nextId,v=e.documentIds,y=e.fieldIds,b=e.fieldLength,S=e.averageFieldLength,g=e.storedFields,A=e.dirtCount,T=e.serializationVersion;if(T!==1&&T!==2)throw new Error("MiniSearch: cannot deserialize an index created with an incompatible version");var F=new o(t);F._documentCount=d,F._nextId=h,F._documentIds=Ce(v),F._idToShortId=new Map,F._fieldIds=y,F._fieldLength=Ce(b),F._avgFieldLength=S,F._storedFields=Ce(g),F._dirtCount=A||0,F._index=new Me;try{for(var L=D(F._documentIds),R=L.next();!R.done;R=L.next()){var V=K(R.value,2),k=V[0],O=V[1];F._idToShortId.set(O,k)}}catch(z){r={error:z}}finally{try{R&&!R.done&&(n=L.return)&&n.call(L)}finally{if(r)throw r.error}}try{for(var C=D(l),_=C.next();!_.done;_=C.next()){var w=K(_.value,2),c=w[0],f=w[1],p=new Map;try{for(var N=(s=void 0,D(Object.keys(f))),I=N.next();!I.done;I=N.next()){var M=I.value,P=f[M];T===1&&(P=P.ds),p.set(parseInt(M,10),Ce(P))}}catch(z){s={error:z}}finally{try{I&&!I.done&&(u=N.return)&&u.call(N)}finally{if(s)throw s.error}}F._index.set(c,p)}}catch(z){a={error:z}}finally{try{_&&!_.done&&(i=C.return)&&i.call(C)}finally{if(a)throw a.error}}return F},o.prototype.executeQuery=function(e,t){var r=this;if(t===void 0&&(t={}),e===o.wildcard)return this.executeWildcardQuery(t);if(typeof e!="string"){var n=W(W(W({},t),e),{queries:void 0}),a=e.queries.map(function(g){return r.executeQuery(g,n)});return this.combineResults(a,n.combineWith)}var i=this._options,s=i.tokenize,u=i.processTerm,l=i.searchOptions,d=W(W({tokenize:s,processTerm:u},l),t),h=d.tokenize,v=d.processTerm,y=h(e).flatMap(function(g){return v(g)}).filter(function(g){return!!g}),b=y.map(jr(d)),S=b.map(function(g){return r.executeQuerySpec(g,d)});return this.combineResults(S,d.combineWith)},o.prototype.executeQuerySpec=function(e,t){var r,n,a,i,s=W(W({},this._options.searchOptions),t),u=(s.fields||this._options.fields).reduce(function(M,P){var z;return W(W({},M),(z={},z[P]=Pe(s.boost,P)||1,z))},{}),l=s.boostDocument,d=s.weights,h=s.maxFuzzy,v=s.bm25,y=W(W({},dt.weights),d),b=y.fuzzy,S=y.prefix,g=this._index.get(e.term),A=this.termResults(e.term,e.term,1,g,u,l,v),T,F;if(e.prefix&&(T=this._index.atPrefix(e.term)),e.fuzzy){var L=e.fuzzy===!0?.2:e.fuzzy,R=L<1?Math.min(h,Math.round(e.term.length*L)):L;R&&(F=this._index.fuzzyGet(e.term,R))}if(T)try{for(var V=D(T),k=V.next();!k.done;k=V.next()){var O=K(k.value,2),C=O[0],_=O[1],w=C.length-e.term.length;if(w){F==null||F.delete(C);var c=S*C.length/(C.length+.3*w);this.termResults(e.term,C,c,_,u,l,v,A)}}}catch(M){r={error:M}}finally{try{k&&!k.done&&(n=V.return)&&n.call(V)}finally{if(r)throw r.error}}if(F)try{for(var f=D(F.keys()),p=f.next();!p.done;p=f.next()){var C=p.value,N=K(F.get(C),2),I=N[0],w=N[1];if(w){var c=b*C.length/(C.length+w);this.termResults(e.term,C,c,I,u,l,v,A)}}}catch(M){a={error:M}}finally{try{p&&!p.done&&(i=f.return)&&i.call(f)}finally{if(a)throw a.error}}return A},o.prototype.executeWildcardQuery=function(e){var t,r,n=new Map,a=W(W({},this._options.searchOptions),e);try{for(var i=D(this._documentIds),s=i.next();!s.done;s=i.next()){var u=K(s.value,2),l=u[0],d=u[1],h=a.boostDocument?a.boostDocument(d,"",this._storedFields.get(l)):1;n.set(l,{score:h,terms:[],match:{}})}}catch(v){t={error:v}}finally{try{s&&!s.done&&(r=i.return)&&r.call(i)}finally{if(t)throw t.error}}return n},o.prototype.combineResults=function(e,t){if(t===void 0&&(t=He),e.length===0)return new Map;var r=t.toLowerCase();return e.reduce(Vr[r])||new Map},o.prototype.toJSON=function(){var e,t,r,n,a=[];try{for(var i=D(this._index),s=i.next();!s.done;s=i.next()){var u=K(s.value,2),l=u[0],d=u[1],h={};try{for(var v=(r=void 0,D(d)),y=v.next();!y.done;y=v.next()){var b=K(y.value,2),S=b[0],g=b[1];h[S]=Object.fromEntries(g)}}catch(A){r={error:A}}finally{try{y&&!y.done&&(n=v.return)&&n.call(v)}finally{if(r)throw r.error}}a.push([l,h])}}catch(A){e={error:A}}finally{try{s&&!s.done&&(t=i.return)&&t.call(i)}finally{if(e)throw e.error}}return{documentCount:this._documentCount,nextId:this._nextId,documentIds:Object.fromEntries(this._documentIds),fieldIds:this._fieldIds,fieldLength:Object.fromEntries(this._fieldLength),averageFieldLength:this._avgFieldLength,storedFields:Object.fromEntries(this._storedFields),dirtCount:this._dirtCount,index:a,serializationVersion:2}},o.prototype.termResults=function(e,t,r,n,a,i,s,u){var l,d,h,v,y;if(u===void 0&&(u=new Map),n==null)return u;try{for(var b=D(Object.keys(a)),S=b.next();!S.done;S=b.next()){var g=S.value,A=a[g],T=this._fieldIds[g],F=n.get(T);if(F!=null){var L=F.size,R=this._avgFieldLength[T];try{for(var V=(h=void 0,D(F.keys())),k=V.next();!k.done;k=V.next()){var O=k.value;if(!this._documentIds.has(O)){this.removeTerm(T,O,t),L-=1;continue}var C=i?i(this._documentIds.get(O),t,this._storedFields.get(O)):1;if(C){var _=F.get(O),w=this._fieldLength.get(O)[T],c=Wr(_,L,this._documentCount,w,R,s),f=r*A*C*c,p=u.get(O);if(p){p.score+=f,Jr(p.terms,e);var N=Pe(p.match,t);N?N.push(g):p.match[t]=[g]}else u.set(O,{score:f,terms:[e],match:(y={},y[t]=[g],y)})}}}catch(I){h={error:I}}finally{try{k&&!k.done&&(v=V.return)&&v.call(V)}finally{if(h)throw h.error}}}}}catch(I){l={error:I}}finally{try{S&&!S.done&&(d=b.return)&&d.call(b)}finally{if(l)throw l.error}}return u},o.prototype.addTerm=function(e,t,r){var n=this._index.fetch(r,pt),a=n.get(e);if(a==null)a=new Map,a.set(t,1),n.set(e,a);else{var i=a.get(t);a.set(t,(i||0)+1)}},o.prototype.removeTerm=function(e,t,r){if(!this._index.has(r)){this.warnDocumentChanged(t,e,r);return}var n=this._index.fetch(r,pt),a=n.get(e);a==null||a.get(t)==null?this.warnDocumentChanged(t,e,r):a.get(t)<=1?a.size<=1?n.delete(e):a.delete(t):a.set(t,a.get(t)-1),this._index.get(r).size===0&&this._index.delete(r)},o.prototype.warnDocumentChanged=function(e,t,r){var n,a;try{for(var i=D(Object.keys(this._fieldIds)),s=i.next();!s.done;s=i.next()){var u=s.value;if(this._fieldIds[u]===t){this._options.logger("warn","MiniSearch: document with ID ".concat(this._documentIds.get(e),' has changed before removal: term "').concat(r,'" was not present in field "').concat(u,'". Removing a document after it has changed can corrupt the index!'),"version_conflict");return}}}catch(l){n={error:l}}finally{try{s&&!s.done&&(a=i.return)&&a.call(i)}finally{if(n)throw n.error}}},o.prototype.addDocumentId=function(e){var t=this._nextId;return this._idToShortId.set(e,t),this._documentIds.set(t,e),this._documentCount+=1,this._nextId+=1,t},o.prototype.addFields=function(e){for(var t=0;t<e.length;t++)this._fieldIds[e[t]]=t},o.prototype.addFieldLength=function(e,t,r,n){var a=this._fieldLength.get(e);a==null&&this._fieldLength.set(e,a=[]),a[t]=n;var i=this._avgFieldLength[t]||0,s=i*r+n;this._avgFieldLength[t]=s/(r+1)},o.prototype.removeFieldLength=function(e,t,r,n){if(r===1){this._avgFieldLength[t]=0;return}var a=this._avgFieldLength[t]*r-n;this._avgFieldLength[t]=a/(r-1)},o.prototype.saveStoredFields=function(e,t){var r,n,a=this._options,i=a.storeFields,s=a.extractField;if(!(i==null||i.length===0)){var u=this._storedFields.get(e);u==null&&this._storedFields.set(e,u={});try{for(var l=D(i),d=l.next();!d.done;d=l.next()){var h=d.value,v=s(t,h);v!==void 0&&(u[h]=v)}}catch(y){r={error:y}}finally{try{d&&!d.done&&(n=l.return)&&n.call(l)}finally{if(r)throw r.error}}}},o.wildcard=Symbol("*"),o}(),Pe=function(o,e){return Object.prototype.hasOwnProperty.call(o,e)?o[e]:void 0},Vr=(ye={},ye[He]=function(o,e){var t,r;try{for(var n=D(e.keys()),a=n.next();!a.done;a=n.next()){var i=a.value,s=o.get(i);if(s==null)o.set(i,e.get(i));else{var u=e.get(i),l=u.score,d=u.terms,h=u.match;s.score=s.score+l,s.match=Object.assign(s.match,h),ht(s.terms,d)}}}catch(v){t={error:v}}finally{try{a&&!a.done&&(r=n.return)&&r.call(n)}finally{if(t)throw t.error}}return o},ye[Tt]=function(o,e){var t,r,n=new Map;try{for(var a=D(e.keys()),i=a.next();!i.done;i=a.next()){var s=i.value,u=o.get(s);if(u!=null){var 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diff --git a/assets/chunks/theme.996dd6ef.js b/assets/chunks/theme.be7b3ccb.js
similarity index 99%
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rename to assets/chunks/theme.be7b3ccb.js
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diff --git a/assets/docs_contribute_codegen.md.038d4799.js b/assets/docs_contribute_codegen.md.5da044b1.js
similarity index 89%
rename from assets/docs_contribute_codegen.md.038d4799.js
rename to assets/docs_contribute_codegen.md.5da044b1.js
index 65e90dc62b..3117217503 100644
--- a/assets/docs_contribute_codegen.md.038d4799.js
+++ b/assets/docs_contribute_codegen.md.5da044b1.js
@@ -1 +1 @@
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diff --git a/assets/docs_contribute_codegen.md.038d4799.lean.js b/assets/docs_contribute_codegen.md.5da044b1.lean.js
similarity index 89%
rename from assets/docs_contribute_codegen.md.038d4799.lean.js
rename to assets/docs_contribute_codegen.md.5da044b1.lean.js
index 65e90dc62b..3117217503 100644
--- a/assets/docs_contribute_codegen.md.038d4799.lean.js
+++ b/assets/docs_contribute_codegen.md.5da044b1.lean.js
@@ -1 +1 @@
-import{_ as t,o,c as a,k as e,a as n}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Codegen","description":"","frontmatter":{"title":"Codegen","outline":"deep"},"headers":[],"relativePath":"docs/contribute/codegen.md","filePath":"docs/contribute/codegen.md","lastUpdated":1701052174000}'),c={name:"docs/contribute/codegen.md"},d=e("h1",{id:"codegen",tabindex:"-1"},[n("Codegen "),e("a",{class:"header-anchor",href:"#codegen","aria-label":'Permalink to "Codegen"'},"​")],-1),s=[d];function r(i,l,_,p,g,h){return o(),a("div",null,s)}const u=t(c,[["render",r]]);export{f as __pageData,u as default};
+import{_ as t,o,c as a,k as e,a as n}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Codegen","description":"","frontmatter":{"title":"Codegen","outline":"deep"},"headers":[],"relativePath":"docs/contribute/codegen.md","filePath":"docs/contribute/codegen.md","lastUpdated":1701053760000}'),c={name:"docs/contribute/codegen.md"},d=e("h1",{id:"codegen",tabindex:"-1"},[n("Codegen "),e("a",{class:"header-anchor",href:"#codegen","aria-label":'Permalink to "Codegen"'},"​")],-1),s=[d];function r(i,l,_,p,g,h){return o(),a("div",null,s)}const u=t(c,[["render",r]]);export{f as __pageData,u as default};
diff --git a/assets/docs_contribute_development.md.260bd01b.js b/assets/docs_contribute_development.md.5b7d3e4f.js
similarity index 99%
rename from assets/docs_contribute_development.md.260bd01b.js
rename to assets/docs_contribute_development.md.5b7d3e4f.js
index 43d7b24d5d..d7335ffbd0 100644
--- a/assets/docs_contribute_development.md.260bd01b.js
+++ b/assets/docs_contribute_development.md.5b7d3e4f.js
@@ -1 +1 @@
-import{_ as s,o as e,c as a,Q as o}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Development","description":"","frontmatter":{"title":"Development","outline":"deep"},"headers":[],"relativePath":"docs/contribute/development.md","filePath":"docs/contribute/development.md","lastUpdated":1701052174000}'),t={name:"docs/contribute/development.md"},l=o('<h1 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h1><p>This page explains how to set up enrionment for OXC development.</p><h2 id="clone-repository" tabindex="-1">Clone Repository <a class="header-anchor" href="#clone-repository" aria-label="Permalink to &quot;Clone Repository&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">git</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">clone</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--recurse-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--shallow-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">git@github.com:oxc-project/oxc.git</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">git</span><span style="color:#24292E;"> </span><span style="color:#032F62;">clone</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--recurse-submodules</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--shallow-submodules</span><span style="color:#24292E;"> </span><span style="color:#032F62;">git@github.com:oxc-project/oxc.git</span></span></code></pre></div><p>The <code>--recurse-submodules</code> and <code>--shallow-submodules</code> flags are needed to initialize git submodules that are needed to run conformance tests.</p><h2 id="set-up-project" tabindex="-1">Set Up Project <a class="header-anchor" href="#set-up-project" aria-label="Permalink to &quot;Set Up Project&quot;">​</a></h2><h3 id="install-rust" tabindex="-1">Install Rust <a class="header-anchor" href="#install-rust" aria-label="Permalink to &quot;Install Rust&quot;">​</a></h3><p>If you have not yet installed Rust, follow <a href="https://www.rust-lang.org/tools/install" target="_blank" rel="noreferrer">the official instruction</a> and install Rust.</p><p>After installing Rust, run the following command at the project root:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">rustup</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">show</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">rustup</span><span style="color:#24292E;"> </span><span style="color:#032F62;">show</span></span></code></pre></div><p><code>rustup show</code> reads the <code>./rust-toolchain.toml</code> file and installs the correct Rust toolchain and components for this project.</p><h3 id="install-project-tools" tabindex="-1">Install Project Tools <a class="header-anchor" href="#install-project-tools" aria-label="Permalink to &quot;Install Project Tools&quot;">​</a></h3><h4 id="cargo-binstall" tabindex="-1"><code>cargo-binstall</code> <a class="header-anchor" href="#cargo-binstall" aria-label="Permalink to &quot;`cargo-binstall`&quot;">​</a></h4><p>Some Cargo tools are required to develop OXC, and it is recommended to use <a href="https://github.com/cargo-bins/cargo-binstall" target="_blank" rel="noreferrer">cargo binstall</a>, which provides a low-complexity mechanism to install rust binaries and is fater way than building them from source by running <code>cargo install</code>.</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo-binstall</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo-binstall</span></span></code></pre></div><p>You can also download <a href="https://github.com/cargo-bins/cargo-binstall#installation" target="_blank" rel="noreferrer">the pre-compiled binary</a> and save it in <code>~/.cargo/bin</code>.</p><h4 id="just" tabindex="-1"><code>just</code> <a class="header-anchor" href="#just" aria-label="Permalink to &quot;`just`&quot;">​</a></h4><p>OXC utilizes <a href="https://github.com/casey/just" target="_blank" rel="noreferrer"><code>just</code></a>, which is a handy way to save and run project-specific commands:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">binstall</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-y</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">binstall</span><span style="color:#24292E;"> </span><span style="color:#032F62;">just</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-y</span></span></code></pre></div><h4 id="dependencies" tabindex="-1">Dependencies <a class="header-anchor" href="#dependencies" aria-label="Permalink to &quot;Dependencies&quot;">​</a></h4><p>Run the following command in <code>justfile</code> at the project root to install dependencies:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">init</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">init</span></span></code></pre></div><p>You can see the list of available commands by running <code>just</code>.</p><p>You can run <code>just ready</code> (or, <code>just r</code> in short) to make sure the whole project builds and runs correctly.</p><hr><p>Now you are ready to develop OXC! You can check out <a href="https://github.com/oxc-project/oxc/contribute" target="_blank" rel="noreferrer">good first issues</a> or ask us on <a href="https://discord.gg/9uXCAwqQZW" target="_blank" rel="noreferrer">Discord</a>.</p>',26),n=[l];function r(c,p,i,d,h,u){return e(),a("div",null,n)}const y=s(t,[["render",r]]);export{g as __pageData,y as default};
+import{_ as s,o as e,c as a,Q as o}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Development","description":"","frontmatter":{"title":"Development","outline":"deep"},"headers":[],"relativePath":"docs/contribute/development.md","filePath":"docs/contribute/development.md","lastUpdated":1701053760000}'),t={name:"docs/contribute/development.md"},l=o('<h1 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h1><p>This page explains how to set up enrionment for OXC development.</p><h2 id="clone-repository" tabindex="-1">Clone Repository <a class="header-anchor" href="#clone-repository" aria-label="Permalink to &quot;Clone Repository&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">git</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">clone</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--recurse-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--shallow-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">git@github.com:oxc-project/oxc.git</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">git</span><span style="color:#24292E;"> </span><span style="color:#032F62;">clone</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--recurse-submodules</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--shallow-submodules</span><span style="color:#24292E;"> </span><span style="color:#032F62;">git@github.com:oxc-project/oxc.git</span></span></code></pre></div><p>The <code>--recurse-submodules</code> and <code>--shallow-submodules</code> flags are needed to initialize git submodules that are needed to run conformance tests.</p><h2 id="set-up-project" tabindex="-1">Set Up Project <a class="header-anchor" href="#set-up-project" aria-label="Permalink to &quot;Set Up Project&quot;">​</a></h2><h3 id="install-rust" tabindex="-1">Install Rust <a class="header-anchor" href="#install-rust" aria-label="Permalink to &quot;Install Rust&quot;">​</a></h3><p>If you have not yet installed Rust, follow <a href="https://www.rust-lang.org/tools/install" target="_blank" rel="noreferrer">the official instruction</a> and install Rust.</p><p>After installing Rust, run the following command at the project root:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">rustup</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">show</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">rustup</span><span style="color:#24292E;"> </span><span style="color:#032F62;">show</span></span></code></pre></div><p><code>rustup show</code> reads the <code>./rust-toolchain.toml</code> file and installs the correct Rust toolchain and components for this project.</p><h3 id="install-project-tools" tabindex="-1">Install Project Tools <a class="header-anchor" href="#install-project-tools" aria-label="Permalink to &quot;Install Project Tools&quot;">​</a></h3><h4 id="cargo-binstall" tabindex="-1"><code>cargo-binstall</code> <a class="header-anchor" href="#cargo-binstall" aria-label="Permalink to &quot;`cargo-binstall`&quot;">​</a></h4><p>Some Cargo tools are required to develop OXC, and it is recommended to use <a href="https://github.com/cargo-bins/cargo-binstall" target="_blank" rel="noreferrer">cargo binstall</a>, which provides a low-complexity mechanism to install rust binaries and is fater way than building them from source by running <code>cargo install</code>.</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo-binstall</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo-binstall</span></span></code></pre></div><p>You can also download <a href="https://github.com/cargo-bins/cargo-binstall#installation" target="_blank" rel="noreferrer">the pre-compiled binary</a> and save it in <code>~/.cargo/bin</code>.</p><h4 id="just" tabindex="-1"><code>just</code> <a class="header-anchor" href="#just" aria-label="Permalink to &quot;`just`&quot;">​</a></h4><p>OXC utilizes <a href="https://github.com/casey/just" target="_blank" rel="noreferrer"><code>just</code></a>, which is a handy way to save and run project-specific commands:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">binstall</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-y</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">binstall</span><span style="color:#24292E;"> </span><span style="color:#032F62;">just</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-y</span></span></code></pre></div><h4 id="dependencies" tabindex="-1">Dependencies <a class="header-anchor" href="#dependencies" aria-label="Permalink to &quot;Dependencies&quot;">​</a></h4><p>Run the following command in <code>justfile</code> at the project root to install dependencies:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">init</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">init</span></span></code></pre></div><p>You can see the list of available commands by running <code>just</code>.</p><p>You can run <code>just ready</code> (or, <code>just r</code> in short) to make sure the whole project builds and runs correctly.</p><hr><p>Now you are ready to develop OXC! You can check out <a href="https://github.com/oxc-project/oxc/contribute" target="_blank" rel="noreferrer">good first issues</a> or ask us on <a href="https://discord.gg/9uXCAwqQZW" target="_blank" rel="noreferrer">Discord</a>.</p>',26),n=[l];function r(c,p,i,d,h,u){return e(),a("div",null,n)}const y=s(t,[["render",r]]);export{g as __pageData,y as default};
diff --git a/assets/docs_contribute_development.md.260bd01b.lean.js b/assets/docs_contribute_development.md.5b7d3e4f.lean.js
similarity index 87%
rename from assets/docs_contribute_development.md.260bd01b.lean.js
rename to assets/docs_contribute_development.md.5b7d3e4f.lean.js
index a317f56eae..179eccb810 100644
--- a/assets/docs_contribute_development.md.260bd01b.lean.js
+++ b/assets/docs_contribute_development.md.5b7d3e4f.lean.js
@@ -1 +1 @@
-import{_ as s,o as e,c as a,Q as o}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Development","description":"","frontmatter":{"title":"Development","outline":"deep"},"headers":[],"relativePath":"docs/contribute/development.md","filePath":"docs/contribute/development.md","lastUpdated":1701052174000}'),t={name:"docs/contribute/development.md"},l=o("",26),n=[l];function r(c,p,i,d,h,u){return e(),a("div",null,n)}const y=s(t,[["render",r]]);export{g as __pageData,y as default};
+import{_ as s,o as e,c as a,Q as o}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Development","description":"","frontmatter":{"title":"Development","outline":"deep"},"headers":[],"relativePath":"docs/contribute/development.md","filePath":"docs/contribute/development.md","lastUpdated":1701053760000}'),t={name:"docs/contribute/development.md"},l=o("",26),n=[l];function r(c,p,i,d,h,u){return e(),a("div",null,n)}const y=s(t,[["render",r]]);export{g as __pageData,y as default};
diff --git a/assets/docs_contribute_formatter.md.c3e52bdc.js b/assets/docs_contribute_formatter.md.d7a59564.js
similarity index 94%
rename from assets/docs_contribute_formatter.md.c3e52bdc.js
rename to assets/docs_contribute_formatter.md.d7a59564.js
index 2c58f405cb..7460dad7cd 100644
--- a/assets/docs_contribute_formatter.md.c3e52bdc.js
+++ b/assets/docs_contribute_formatter.md.d7a59564.js
@@ -1 +1 @@
-import{_ as t,o as a,c as r,k as e,a as o}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Formatter","description":"","frontmatter":{"title":"Formatter","outline":"deep"},"headers":[],"relativePath":"docs/contribute/formatter.md","filePath":"docs/contribute/formatter.md","lastUpdated":1701052174000}'),i={name:"docs/contribute/formatter.md"},n=e("h1",{id:"formatter",tabindex:"-1"},[o("Formatter "),e("a",{class:"header-anchor",href:"#formatter","aria-label":'Permalink to "Formatter"'},"​")],-1),s=e("p",null,"While [prettier] has established itself as the de facto code formatter for JavaScript, there is a significant demand in the developer community for a less opinionated alternative. Recognizing this need, our ambition is to undertake research and development to create a new JavaScript formatter that offers increased flexibility and customization options. Unfortunately we are currently lacking the resources to do so.",-1),c=[n,s];function d(l,m,f,h,p,u){return a(),r("div",null,c)}const v=t(i,[["render",d]]);export{b as __pageData,v as default};
+import{_ as t,o as a,c as r,k as e,a as o}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Formatter","description":"","frontmatter":{"title":"Formatter","outline":"deep"},"headers":[],"relativePath":"docs/contribute/formatter.md","filePath":"docs/contribute/formatter.md","lastUpdated":1701053760000}'),i={name:"docs/contribute/formatter.md"},n=e("h1",{id:"formatter",tabindex:"-1"},[o("Formatter "),e("a",{class:"header-anchor",href:"#formatter","aria-label":'Permalink to "Formatter"'},"​")],-1),s=e("p",null,"While [prettier] has established itself as the de facto code formatter for JavaScript, there is a significant demand in the developer community for a less opinionated alternative. Recognizing this need, our ambition is to undertake research and development to create a new JavaScript formatter that offers increased flexibility and customization options. Unfortunately we are currently lacking the resources to do so.",-1),c=[n,s];function d(l,m,f,h,p,u){return a(),r("div",null,c)}const v=t(i,[["render",d]]);export{b as __pageData,v as default};
diff --git a/assets/docs_contribute_formatter.md.c3e52bdc.lean.js b/assets/docs_contribute_formatter.md.d7a59564.lean.js
similarity index 94%
rename from assets/docs_contribute_formatter.md.c3e52bdc.lean.js
rename to assets/docs_contribute_formatter.md.d7a59564.lean.js
index 2c58f405cb..7460dad7cd 100644
--- a/assets/docs_contribute_formatter.md.c3e52bdc.lean.js
+++ b/assets/docs_contribute_formatter.md.d7a59564.lean.js
@@ -1 +1 @@
-import{_ as t,o as a,c as r,k as e,a as o}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Formatter","description":"","frontmatter":{"title":"Formatter","outline":"deep"},"headers":[],"relativePath":"docs/contribute/formatter.md","filePath":"docs/contribute/formatter.md","lastUpdated":1701052174000}'),i={name:"docs/contribute/formatter.md"},n=e("h1",{id:"formatter",tabindex:"-1"},[o("Formatter "),e("a",{class:"header-anchor",href:"#formatter","aria-label":'Permalink to "Formatter"'},"​")],-1),s=e("p",null,"While [prettier] has established itself as the de facto code formatter for JavaScript, there is a significant demand in the developer community for a less opinionated alternative. Recognizing this need, our ambition is to undertake research and development to create a new JavaScript formatter that offers increased flexibility and customization options. Unfortunately we are currently lacking the resources to do so.",-1),c=[n,s];function d(l,m,f,h,p,u){return a(),r("div",null,c)}const v=t(i,[["render",d]]);export{b as __pageData,v as default};
+import{_ as t,o as a,c as r,k as e,a as o}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Formatter","description":"","frontmatter":{"title":"Formatter","outline":"deep"},"headers":[],"relativePath":"docs/contribute/formatter.md","filePath":"docs/contribute/formatter.md","lastUpdated":1701053760000}'),i={name:"docs/contribute/formatter.md"},n=e("h1",{id:"formatter",tabindex:"-1"},[o("Formatter "),e("a",{class:"header-anchor",href:"#formatter","aria-label":'Permalink to "Formatter"'},"​")],-1),s=e("p",null,"While [prettier] has established itself as the de facto code formatter for JavaScript, there is a significant demand in the developer community for a less opinionated alternative. Recognizing this need, our ambition is to undertake research and development to create a new JavaScript formatter that offers increased flexibility and customization options. Unfortunately we are currently lacking the resources to do so.",-1),c=[n,s];function d(l,m,f,h,p,u){return a(),r("div",null,c)}const v=t(i,[["render",d]]);export{b as __pageData,v as default};
diff --git a/assets/docs_contribute_introduction.md.b8b3797b.js b/assets/docs_contribute_introduction.md.5c1fbb9f.js
similarity index 98%
rename from assets/docs_contribute_introduction.md.b8b3797b.js
rename to assets/docs_contribute_introduction.md.5c1fbb9f.js
index ec0824cbad..0e8b67eb87 100644
--- a/assets/docs_contribute_introduction.md.b8b3797b.js
+++ b/assets/docs_contribute_introduction.md.5c1fbb9f.js
@@ -1 +1 @@
-import{_ as e,o as t,c as a,Q as o}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/contribute/introduction.md","filePath":"docs/contribute/introduction.md","lastUpdated":1701052174000}'),i={name:"docs/contribute/introduction.md"},n=o('<h1 id="introduction" tabindex="-1">Introduction <a class="header-anchor" href="#introduction" aria-label="Permalink to &quot;Introduction&quot;">​</a></h1><p>Thank you for getting interested in contributing to OXC project! Before starting, please make sure to read the following rules and policy.</p><h2 id="general-rules" tabindex="-1">General Rules <a class="header-anchor" href="#general-rules" aria-label="Permalink to &quot;General Rules&quot;">​</a></h2><ul><li>We welcome and appreciate any form of contributions.</li><li>Please create an issue or discussion if you want to make an architectural change.</li></ul><h2 id="pr-rules" tabindex="-1">PR Rules <a class="header-anchor" href="#pr-rules" aria-label="Permalink to &quot;PR Rules&quot;">​</a></h2><ul><li>We <a href="https://graphite.dev/blog/how-large-prs-slow-down-development" target="_blank" rel="noreferrer">prefer smaller PRs</a> for faster development.</li><li>Try stacked PRs with <a href="https://graphite.dev" target="_blank" rel="noreferrer">graphite</a> if you are given access permission to the repository.</li></ul><h2 id="action-policy" tabindex="-1">Action Policy <a class="header-anchor" href="#action-policy" aria-label="Permalink to &quot;Action Policy&quot;">​</a></h2><p>Taken from <a href="https://astral-sh.notion.site/Astral-s-Values-0ed6a642bcc84e91af6836b2373572f5" target="_blank" rel="noreferrer">Astral&#39;s values</a>:</p><blockquote><p>We bias towards action, even in the face of uncertainty. We favor <em>pragmatic doing</em> over <strong>prolonged debating</strong>; we favor asking for <em>forgiveness</em> over <em>permission</em>. We value <strong>decisiveness — especially</strong> when a decision isn’t clear cut, and <strong>especially</strong> when a decision is reversible.</p><p>A bias towards action is <em>not</em> the same as recklessness. Rather, it’s a bias towards making <em>responsible</em> decisions and acting on them with <em>urgency</em>, even if we’re left with lingering ambiguity or known unknowns.</p></blockquote><h2 id="development-policy" tabindex="-1">Development Policy <a class="header-anchor" href="#development-policy" aria-label="Permalink to &quot;Development Policy&quot;">​</a></h2><ul><li>All performance issues (runtime and compilation speed) are considered as bugs in this project.</li><li>Embrace data-oriented design.</li><li>APIs should be simple and well-documented.</li><li>Third-party dependencies should be minimal.</li><li>Avoid the <code>regex</code> crate when possible. Regexes are slow, most of them can be rewritten in a performant way by using Rust iterator and string methods.</li><li>Avoid macros, traits or any Rust techniques that would penalize compilation speed.</li></ul><h2 id="maintenance-policy" tabindex="-1">Maintenance Policy <a class="header-anchor" href="#maintenance-policy" aria-label="Permalink to &quot;Maintenance Policy&quot;">​</a></h2><ul><li>Monitor code coverage for unused code. Aim for 99% code coverage.</li><li>CI time should be actively monitored and reduced to speed up merging of PRs. The current CI time on GitHub actions is around 3 minutes.</li></ul>',13),r=[n];function s(l,c,d,u,h,p){return t(),a("div",null,r)}const g=e(i,[["render",s]]);export{f as __pageData,g as default};
+import{_ as e,o as t,c as a,Q as o}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/contribute/introduction.md","filePath":"docs/contribute/introduction.md","lastUpdated":1701053760000}'),i={name:"docs/contribute/introduction.md"},n=o('<h1 id="introduction" tabindex="-1">Introduction <a class="header-anchor" href="#introduction" aria-label="Permalink to &quot;Introduction&quot;">​</a></h1><p>Thank you for getting interested in contributing to OXC project! Before starting, please make sure to read the following rules and policy.</p><h2 id="general-rules" tabindex="-1">General Rules <a class="header-anchor" href="#general-rules" aria-label="Permalink to &quot;General Rules&quot;">​</a></h2><ul><li>We welcome and appreciate any form of contributions.</li><li>Please create an issue or discussion if you want to make an architectural change.</li></ul><h2 id="pr-rules" tabindex="-1">PR Rules <a class="header-anchor" href="#pr-rules" aria-label="Permalink to &quot;PR Rules&quot;">​</a></h2><ul><li>We <a href="https://graphite.dev/blog/how-large-prs-slow-down-development" target="_blank" rel="noreferrer">prefer smaller PRs</a> for faster development.</li><li>Try stacked PRs with <a href="https://graphite.dev" target="_blank" rel="noreferrer">graphite</a> if you are given access permission to the repository.</li></ul><h2 id="action-policy" tabindex="-1">Action Policy <a class="header-anchor" href="#action-policy" aria-label="Permalink to &quot;Action Policy&quot;">​</a></h2><p>Taken from <a href="https://astral-sh.notion.site/Astral-s-Values-0ed6a642bcc84e91af6836b2373572f5" target="_blank" rel="noreferrer">Astral&#39;s values</a>:</p><blockquote><p>We bias towards action, even in the face of uncertainty. We favor <em>pragmatic doing</em> over <strong>prolonged debating</strong>; we favor asking for <em>forgiveness</em> over <em>permission</em>. We value <strong>decisiveness — especially</strong> when a decision isn’t clear cut, and <strong>especially</strong> when a decision is reversible.</p><p>A bias towards action is <em>not</em> the same as recklessness. Rather, it’s a bias towards making <em>responsible</em> decisions and acting on them with <em>urgency</em>, even if we’re left with lingering ambiguity or known unknowns.</p></blockquote><h2 id="development-policy" tabindex="-1">Development Policy <a class="header-anchor" href="#development-policy" aria-label="Permalink to &quot;Development Policy&quot;">​</a></h2><ul><li>All performance issues (runtime and compilation speed) are considered as bugs in this project.</li><li>Embrace data-oriented design.</li><li>APIs should be simple and well-documented.</li><li>Third-party dependencies should be minimal.</li><li>Avoid the <code>regex</code> crate when possible. Regexes are slow, most of them can be rewritten in a performant way by using Rust iterator and string methods.</li><li>Avoid macros, traits or any Rust techniques that would penalize compilation speed.</li></ul><h2 id="maintenance-policy" tabindex="-1">Maintenance Policy <a class="header-anchor" href="#maintenance-policy" aria-label="Permalink to &quot;Maintenance Policy&quot;">​</a></h2><ul><li>Monitor code coverage for unused code. Aim for 99% code coverage.</li><li>CI time should be actively monitored and reduced to speed up merging of PRs. The current CI time on GitHub actions is around 3 minutes.</li></ul>',13),r=[n];function s(l,c,d,u,h,p){return t(),a("div",null,r)}const g=e(i,[["render",s]]);export{f as __pageData,g as default};
diff --git a/assets/docs_contribute_introduction.md.b8b3797b.lean.js b/assets/docs_contribute_introduction.md.5c1fbb9f.lean.js
similarity index 87%
rename from assets/docs_contribute_introduction.md.b8b3797b.lean.js
rename to assets/docs_contribute_introduction.md.5c1fbb9f.lean.js
index 56bbcdfec7..4ce80fbd83 100644
--- a/assets/docs_contribute_introduction.md.b8b3797b.lean.js
+++ b/assets/docs_contribute_introduction.md.5c1fbb9f.lean.js
@@ -1 +1 @@
-import{_ as e,o as t,c as a,Q as o}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/contribute/introduction.md","filePath":"docs/contribute/introduction.md","lastUpdated":1701052174000}'),i={name:"docs/contribute/introduction.md"},n=o("",13),r=[n];function s(l,c,d,u,h,p){return t(),a("div",null,r)}const g=e(i,[["render",s]]);export{f as __pageData,g as default};
+import{_ as e,o as t,c as a,Q as o}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/contribute/introduction.md","filePath":"docs/contribute/introduction.md","lastUpdated":1701053760000}'),i={name:"docs/contribute/introduction.md"},n=o("",13),r=[n];function s(l,c,d,u,h,p){return t(),a("div",null,r)}const g=e(i,[["render",s]]);export{f as __pageData,g as default};
diff --git a/assets/docs_contribute_linter.md.b1685e29.js b/assets/docs_contribute_linter.md.15e43eac.js
similarity index 98%
rename from assets/docs_contribute_linter.md.b1685e29.js
rename to assets/docs_contribute_linter.md.15e43eac.js
index 7b29fcd0a6..0bfb4ad9a9 100644
--- a/assets/docs_contribute_linter.md.b1685e29.js
+++ b/assets/docs_contribute_linter.md.15e43eac.js
@@ -1,4 +1,4 @@
-import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep"},"headers":[],"relativePath":"docs/contribute/linter.md","filePath":"docs/contribute/linter.md","lastUpdated":1701052174000}'),l={name:"docs/contribute/linter.md"},o=e(`<h1 id="linter" tabindex="-1">Linter <a class="header-anchor" href="#linter" aria-label="Permalink to &quot;Linter&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Create a <code>./test.ts</code> and then</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">watch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">watch</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre></div><h2 id="rule-generation" tabindex="-1">Rule generation <a class="header-anchor" href="#rule-generation" aria-label="Permalink to &quot;Rule generation&quot;">​</a></h2><p>Create a new lint rule by providing the ESLint name</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span></code></pre></div><p>Then add the rule to <code>crates/oxc_linter/src/rules.rs</code>:</p><ol><li>Add to <code>mod</code></li><li>Add to <code>oxc_macros::declare_all_lint_rules</code> at the bottom of the file</li></ol><p>For other plugins, there are also:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-jest-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep"},"headers":[],"relativePath":"docs/contribute/linter.md","filePath":"docs/contribute/linter.md","lastUpdated":1701053760000}'),l={name:"docs/contribute/linter.md"},o=e(`<h1 id="linter" tabindex="-1">Linter <a class="header-anchor" href="#linter" aria-label="Permalink to &quot;Linter&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Create a <code>./test.ts</code> and then</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">watch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">watch</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre></div><h2 id="rule-generation" tabindex="-1">Rule generation <a class="header-anchor" href="#rule-generation" aria-label="Permalink to &quot;Rule generation&quot;">​</a></h2><p>Create a new lint rule by providing the ESLint name</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span></code></pre></div><p>Then add the rule to <code>crates/oxc_linter/src/rules.rs</code>:</p><ol><li>Add to <code>mod</code></li><li>Add to <code>oxc_macros::declare_all_lint_rules</code> at the bottom of the file</li></ol><p>For other plugins, there are also:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-jest-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
 <span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-ts-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
 <span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-unicorn-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
 <span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-react-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
diff --git a/assets/docs_contribute_linter.md.b1685e29.lean.js b/assets/docs_contribute_linter.md.15e43eac.lean.js
similarity index 86%
rename from assets/docs_contribute_linter.md.b1685e29.lean.js
rename to assets/docs_contribute_linter.md.15e43eac.lean.js
index 007557fe5a..66088ee24c 100644
--- a/assets/docs_contribute_linter.md.b1685e29.lean.js
+++ b/assets/docs_contribute_linter.md.15e43eac.lean.js
@@ -1 +1 @@
-import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep"},"headers":[],"relativePath":"docs/contribute/linter.md","filePath":"docs/contribute/linter.md","lastUpdated":1701052174000}'),l={name:"docs/contribute/linter.md"},o=e("",11),t=[o];function p(r,c,i,d,y,u){return a(),n("div",null,t)}const F=s(l,[["render",p]]);export{h as __pageData,F as default};
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep"},"headers":[],"relativePath":"docs/contribute/linter.md","filePath":"docs/contribute/linter.md","lastUpdated":1701053760000}'),l={name:"docs/contribute/linter.md"},o=e("",11),t=[o];function p(r,c,i,d,y,u){return a(),n("div",null,t)}const F=s(l,[["render",p]]);export{h as __pageData,F as default};
diff --git a/assets/docs_contribute_minifier.md.8673c15a.js b/assets/docs_contribute_minifier.md.15260fdc.js
similarity index 96%
rename from assets/docs_contribute_minifier.md.8673c15a.js
rename to assets/docs_contribute_minifier.md.15260fdc.js
index 024058a631..9a7bee6c01 100644
--- a/assets/docs_contribute_minifier.md.8673c15a.js
+++ b/assets/docs_contribute_minifier.md.15260fdc.js
@@ -1 +1 @@
-import{_ as i,o as t,c as o,k as e,a as s}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Minifier","description":"","frontmatter":{"title":"Minifier","outline":"deep"},"headers":[],"relativePath":"docs/contribute/minifier.md","filePath":"docs/contribute/minifier.md","lastUpdated":1701052174000}'),r={name:"docs/contribute/minifier.md"},a=e("h1",{id:"minifier",tabindex:"-1"},[s("Minifier "),e("a",{class:"header-anchor",href:"#minifier","aria-label":'Permalink to "Minifier"'},"​")],-1),n=e("p",null,"JavaScript minification plays a crucial role in optimizing website performance as it reduces the amount of data sent to users, resulting in faster page loads. This holds tremendous economic value, particularly for e-commerce websites, where every second can equate to millions of dollars.",-1),c=e("p",null,"However, existing minifiers typically require a trade-off between compression quality and speed. You have to choose between the slowest for the best compression or the fastest for less compression. But what if we could develop a faster minifier without compromising on compression?",-1),l=e("p",null,"We are actively working on a prototype that aims to achieve this goal, by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].",-1),d=e("p",null,"Preliminary results indicate that we are on track to achieve our objectives. With the Oxc minifier, you can expect faster minification times without sacrificing compression quality.",-1),f=[a,n,c,l,d];function m(p,u,h,_,w,b){return t(),o("div",null,f)}const v=i(r,[["render",m]]);export{g as __pageData,v as default};
+import{_ as i,o as t,c as o,k as e,a as s}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Minifier","description":"","frontmatter":{"title":"Minifier","outline":"deep"},"headers":[],"relativePath":"docs/contribute/minifier.md","filePath":"docs/contribute/minifier.md","lastUpdated":1701053760000}'),r={name:"docs/contribute/minifier.md"},a=e("h1",{id:"minifier",tabindex:"-1"},[s("Minifier "),e("a",{class:"header-anchor",href:"#minifier","aria-label":'Permalink to "Minifier"'},"​")],-1),n=e("p",null,"JavaScript minification plays a crucial role in optimizing website performance as it reduces the amount of data sent to users, resulting in faster page loads. This holds tremendous economic value, particularly for e-commerce websites, where every second can equate to millions of dollars.",-1),c=e("p",null,"However, existing minifiers typically require a trade-off between compression quality and speed. You have to choose between the slowest for the best compression or the fastest for less compression. But what if we could develop a faster minifier without compromising on compression?",-1),l=e("p",null,"We are actively working on a prototype that aims to achieve this goal, by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].",-1),d=e("p",null,"Preliminary results indicate that we are on track to achieve our objectives. With the Oxc minifier, you can expect faster minification times without sacrificing compression quality.",-1),f=[a,n,c,l,d];function m(p,u,h,_,w,b){return t(),o("div",null,f)}const v=i(r,[["render",m]]);export{g as __pageData,v as default};
diff --git a/assets/docs_contribute_minifier.md.8673c15a.lean.js b/assets/docs_contribute_minifier.md.15260fdc.lean.js
similarity index 96%
rename from assets/docs_contribute_minifier.md.8673c15a.lean.js
rename to assets/docs_contribute_minifier.md.15260fdc.lean.js
index 024058a631..9a7bee6c01 100644
--- a/assets/docs_contribute_minifier.md.8673c15a.lean.js
+++ b/assets/docs_contribute_minifier.md.15260fdc.lean.js
@@ -1 +1 @@
-import{_ as i,o as t,c as o,k as e,a as s}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Minifier","description":"","frontmatter":{"title":"Minifier","outline":"deep"},"headers":[],"relativePath":"docs/contribute/minifier.md","filePath":"docs/contribute/minifier.md","lastUpdated":1701052174000}'),r={name:"docs/contribute/minifier.md"},a=e("h1",{id:"minifier",tabindex:"-1"},[s("Minifier "),e("a",{class:"header-anchor",href:"#minifier","aria-label":'Permalink to "Minifier"'},"​")],-1),n=e("p",null,"JavaScript minification plays a crucial role in optimizing website performance as it reduces the amount of data sent to users, resulting in faster page loads. This holds tremendous economic value, particularly for e-commerce websites, where every second can equate to millions of dollars.",-1),c=e("p",null,"However, existing minifiers typically require a trade-off between compression quality and speed. You have to choose between the slowest for the best compression or the fastest for less compression. But what if we could develop a faster minifier without compromising on compression?",-1),l=e("p",null,"We are actively working on a prototype that aims to achieve this goal, by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].",-1),d=e("p",null,"Preliminary results indicate that we are on track to achieve our objectives. With the Oxc minifier, you can expect faster minification times without sacrificing compression quality.",-1),f=[a,n,c,l,d];function m(p,u,h,_,w,b){return t(),o("div",null,f)}const v=i(r,[["render",m]]);export{g as __pageData,v as default};
+import{_ as i,o as t,c as o,k as e,a as s}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Minifier","description":"","frontmatter":{"title":"Minifier","outline":"deep"},"headers":[],"relativePath":"docs/contribute/minifier.md","filePath":"docs/contribute/minifier.md","lastUpdated":1701053760000}'),r={name:"docs/contribute/minifier.md"},a=e("h1",{id:"minifier",tabindex:"-1"},[s("Minifier "),e("a",{class:"header-anchor",href:"#minifier","aria-label":'Permalink to "Minifier"'},"​")],-1),n=e("p",null,"JavaScript minification plays a crucial role in optimizing website performance as it reduces the amount of data sent to users, resulting in faster page loads. This holds tremendous economic value, particularly for e-commerce websites, where every second can equate to millions of dollars.",-1),c=e("p",null,"However, existing minifiers typically require a trade-off between compression quality and speed. You have to choose between the slowest for the best compression or the fastest for less compression. But what if we could develop a faster minifier without compromising on compression?",-1),l=e("p",null,"We are actively working on a prototype that aims to achieve this goal, by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].",-1),d=e("p",null,"Preliminary results indicate that we are on track to achieve our objectives. With the Oxc minifier, you can expect faster minification times without sacrificing compression quality.",-1),f=[a,n,c,l,d];function m(p,u,h,_,w,b){return t(),o("div",null,f)}const v=i(r,[["render",m]]);export{g as __pageData,v as default};
diff --git a/assets/docs_contribute_parser.md.dea12757.js b/assets/docs_contribute_parser.md.bb1bc2fa.js
similarity index 97%
rename from assets/docs_contribute_parser.md.dea12757.js
rename to assets/docs_contribute_parser.md.bb1bc2fa.js
index ab6a73980d..af29fd1bc6 100644
--- a/assets/docs_contribute_parser.md.dea12757.js
+++ b/assets/docs_contribute_parser.md.bb1bc2fa.js
@@ -1 +1 @@
-import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"docs/contribute/parser.md","filePath":"docs/contribute/parser.md","lastUpdated":1701052174000}'),s={name:"docs/contribute/parser.md"},o=r('<h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>We aim to be the fastest Rust-based ready-for-production parser.</p><h2 id="conformance-tests" tabindex="-1">Conformance Tests <a class="header-anchor" href="#conformance-tests" aria-label="Permalink to &quot;Conformance Tests&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">c</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">c</span></span></code></pre></div><p>Aliased to <code>just coverage</code>, runs the following conformance test suites by using the conformance runner found in <a href="https://github.com/oxc-project/oxc/tree/main/tasks/coverage" target="_blank" rel="noreferrer">tasks/coverage</a>.</p><h3 id="test262" tabindex="-1">Test262 <a class="header-anchor" href="#test262" aria-label="Permalink to &quot;Test262&quot;">​</a></h3><p>JavaScript has the <a href="https://github.com/tc39/test262" target="_blank" rel="noreferrer">ECMAScript Test Suite</a> called Test262. The goal of Test262 is to provide test material that covers every observable behavior specified in the specification. Parser conformance uses the <a href="https://github.com/tc39/test262/blob/main/INTERPRETING.md#negative" target="_blank" rel="noreferrer">parse phase tests</a>.</p><h3 id="babel" tabindex="-1">Babel <a class="header-anchor" href="#babel" aria-label="Permalink to &quot;Babel&quot;">​</a></h3><p>When new language features are added to JavaScript, it is required to have them implemented by Babel, this means Babel has another set of <a href="https://github.com/babel/babel/tree/main/packages/babel-parser/test" target="_blank" rel="noreferrer">parser tests</a>.</p><h3 id="typescript" tabindex="-1">TypeScript <a class="header-anchor" href="#typescript" aria-label="Permalink to &quot;TypeScript&quot;">​</a></h3><p>The TypeScript conformance tests can be found <a href="https://github.com/microsoft/TypeScript/tree/main/tests/cases/conformance" target="_blank" rel="noreferrer">here</a>.</p><h2 id="test-runner" tabindex="-1">Test Runner <a class="header-anchor" href="#test-runner" aria-label="Permalink to &quot;Test Runner&quot;">​</a></h2><p>Rome has implemented a test runner for the above test suites, they can be found .</p>',13),n=[o];function c(i,l,p,h,d,b){return a(),t("div",null,n)}const m=e(s,[["render",c]]);export{f as __pageData,m as default};
+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"docs/contribute/parser.md","filePath":"docs/contribute/parser.md","lastUpdated":1701053760000}'),s={name:"docs/contribute/parser.md"},o=r('<h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>We aim to be the fastest Rust-based ready-for-production parser.</p><h2 id="conformance-tests" tabindex="-1">Conformance Tests <a class="header-anchor" href="#conformance-tests" aria-label="Permalink to &quot;Conformance Tests&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">c</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">c</span></span></code></pre></div><p>Aliased to <code>just coverage</code>, runs the following conformance test suites by using the conformance runner found in <a href="https://github.com/oxc-project/oxc/tree/main/tasks/coverage" target="_blank" rel="noreferrer">tasks/coverage</a>.</p><h3 id="test262" tabindex="-1">Test262 <a class="header-anchor" href="#test262" aria-label="Permalink to &quot;Test262&quot;">​</a></h3><p>JavaScript has the <a href="https://github.com/tc39/test262" target="_blank" rel="noreferrer">ECMAScript Test Suite</a> called Test262. The goal of Test262 is to provide test material that covers every observable behavior specified in the specification. Parser conformance uses the <a href="https://github.com/tc39/test262/blob/main/INTERPRETING.md#negative" target="_blank" rel="noreferrer">parse phase tests</a>.</p><h3 id="babel" tabindex="-1">Babel <a class="header-anchor" href="#babel" aria-label="Permalink to &quot;Babel&quot;">​</a></h3><p>When new language features are added to JavaScript, it is required to have them implemented by Babel, this means Babel has another set of <a href="https://github.com/babel/babel/tree/main/packages/babel-parser/test" target="_blank" rel="noreferrer">parser tests</a>.</p><h3 id="typescript" tabindex="-1">TypeScript <a class="header-anchor" href="#typescript" aria-label="Permalink to &quot;TypeScript&quot;">​</a></h3><p>The TypeScript conformance tests can be found <a href="https://github.com/microsoft/TypeScript/tree/main/tests/cases/conformance" target="_blank" rel="noreferrer">here</a>.</p><h2 id="test-runner" tabindex="-1">Test Runner <a class="header-anchor" href="#test-runner" aria-label="Permalink to &quot;Test Runner&quot;">​</a></h2><p>Rome has implemented a test runner for the above test suites, they can be found .</p>',13),n=[o];function c(i,l,p,h,d,b){return a(),t("div",null,n)}const m=e(s,[["render",c]]);export{f as __pageData,m as default};
diff --git a/assets/docs_contribute_parser.md.dea12757.lean.js b/assets/docs_contribute_parser.md.bb1bc2fa.lean.js
similarity index 86%
rename from assets/docs_contribute_parser.md.dea12757.lean.js
rename to assets/docs_contribute_parser.md.bb1bc2fa.lean.js
index 19a61d0bc0..4982223782 100644
--- a/assets/docs_contribute_parser.md.dea12757.lean.js
+++ b/assets/docs_contribute_parser.md.bb1bc2fa.lean.js
@@ -1 +1 @@
-import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"docs/contribute/parser.md","filePath":"docs/contribute/parser.md","lastUpdated":1701052174000}'),s={name:"docs/contribute/parser.md"},o=r("",13),n=[o];function c(i,l,p,h,d,b){return a(),t("div",null,n)}const m=e(s,[["render",c]]);export{f as __pageData,m as default};
+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"docs/contribute/parser.md","filePath":"docs/contribute/parser.md","lastUpdated":1701053760000}'),s={name:"docs/contribute/parser.md"},o=r("",13),n=[o];function c(i,l,p,h,d,b){return a(),t("div",null,n)}const m=e(s,[["render",c]]);export{f as __pageData,m as default};
diff --git a/assets/docs_contribute_performance.md.32708dc6.js b/assets/docs_contribute_performance.md.4ff20e3f.js
similarity index 99%
rename from assets/docs_contribute_performance.md.32708dc6.js
rename to assets/docs_contribute_performance.md.4ff20e3f.js
index c3919af841..3e83a32b8a 100644
--- a/assets/docs_contribute_performance.md.32708dc6.js
+++ b/assets/docs_contribute_performance.md.4ff20e3f.js
@@ -1,4 +1,4 @@
-import{_ as s,o as e,c as a,Q as n}from"./chunks/framework.725e5b03.js";const E=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"docs/contribute/performance.md","filePath":"docs/contribute/performance.md","lastUpdated":1701052174000}'),o={name:"docs/contribute/performance.md"},l=n(`<h1 id="performance-tuning" tabindex="-1">Performance Tuning <a class="header-anchor" href="#performance-tuning" aria-label="Permalink to &quot;Performance Tuning&quot;">​</a></h1><h2 id="compile-time" tabindex="-1">Compile Time <a class="header-anchor" href="#compile-time" aria-label="Permalink to &quot;Compile Time&quot;">​</a></h2><p>While Rust has gained a reputation for its comparatively slower compilation speed, we have dedicated significant effort to fine-tune the Rust compilation speed. Our aim is to minimize any impact on your development workflow, ensuring that developing your own Oxc based tools remains a smooth and efficient experience.</p><p>This is demonstrated by our <a href="https://github.com/oxc-project/oxc/actions/workflows/ci.yml?query=branch%3Amain" target="_blank" rel="noreferrer">CI runs</a>, where warm runs complete in 5 minutes.</p><h2 id="profile" tabindex="-1">Profile <a class="header-anchor" href="#profile" aria-label="Permalink to &quot;Profile&quot;">​</a></h2><h3 id="mac-xcode-instruments" tabindex="-1">Mac Xcode Instruments <a class="header-anchor" href="#mac-xcode-instruments" aria-label="Permalink to &quot;Mac Xcode Instruments&quot;">​</a></h3><p>Mac Xcode instruments can be used to produce a CPU profile.</p><p>To install Xcode Instruments, install the Command Line Tools:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">xcode-select</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--install</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">xcode-select</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--install</span></span></code></pre></div><p>For normal Rust builds, <a href="https://github.com/cmyr/cargo-instruments" target="_blank" rel="noreferrer"><code>cargo instruments</code></a> can be used as the glue for profiling and creating the trace file.</p><p>First, change the profile for showing debug symbols.</p><div class="language-toml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">toml</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">[</span><span style="color:#B392F0;">profile</span><span style="color:#E1E4E8;">.</span><span style="color:#B392F0;">release</span><span style="color:#E1E4E8;">]</span></span>
+import{_ as s,o as e,c as a,Q as n}from"./chunks/framework.725e5b03.js";const E=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"docs/contribute/performance.md","filePath":"docs/contribute/performance.md","lastUpdated":1701053760000}'),o={name:"docs/contribute/performance.md"},l=n(`<h1 id="performance-tuning" tabindex="-1">Performance Tuning <a class="header-anchor" href="#performance-tuning" aria-label="Permalink to &quot;Performance Tuning&quot;">​</a></h1><h2 id="compile-time" tabindex="-1">Compile Time <a class="header-anchor" href="#compile-time" aria-label="Permalink to &quot;Compile Time&quot;">​</a></h2><p>While Rust has gained a reputation for its comparatively slower compilation speed, we have dedicated significant effort to fine-tune the Rust compilation speed. Our aim is to minimize any impact on your development workflow, ensuring that developing your own Oxc based tools remains a smooth and efficient experience.</p><p>This is demonstrated by our <a href="https://github.com/oxc-project/oxc/actions/workflows/ci.yml?query=branch%3Amain" target="_blank" rel="noreferrer">CI runs</a>, where warm runs complete in 5 minutes.</p><h2 id="profile" tabindex="-1">Profile <a class="header-anchor" href="#profile" aria-label="Permalink to &quot;Profile&quot;">​</a></h2><h3 id="mac-xcode-instruments" tabindex="-1">Mac Xcode Instruments <a class="header-anchor" href="#mac-xcode-instruments" aria-label="Permalink to &quot;Mac Xcode Instruments&quot;">​</a></h3><p>Mac Xcode instruments can be used to produce a CPU profile.</p><p>To install Xcode Instruments, install the Command Line Tools:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">xcode-select</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--install</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">xcode-select</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--install</span></span></code></pre></div><p>For normal Rust builds, <a href="https://github.com/cmyr/cargo-instruments" target="_blank" rel="noreferrer"><code>cargo instruments</code></a> can be used as the glue for profiling and creating the trace file.</p><p>First, change the profile for showing debug symbols.</p><div class="language-toml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">toml</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">[</span><span style="color:#B392F0;">profile</span><span style="color:#E1E4E8;">.</span><span style="color:#B392F0;">release</span><span style="color:#E1E4E8;">]</span></span>
 <span class="line"><span style="color:#E1E4E8;">debug = </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;"># debug info with line tables only</span></span>
 <span class="line"><span style="color:#E1E4E8;">strip = </span><span style="color:#79B8FF;">false</span><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;"># do not strip symbols</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">[</span><span style="color:#6F42C1;">profile</span><span style="color:#24292E;">.</span><span style="color:#6F42C1;">release</span><span style="color:#24292E;">]</span></span>
 <span class="line"><span style="color:#24292E;">debug = </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> </span><span style="color:#6A737D;"># debug info with line tables only</span></span>
diff --git a/assets/docs_contribute_performance.md.32708dc6.lean.js b/assets/docs_contribute_performance.md.4ff20e3f.lean.js
similarity index 87%
rename from assets/docs_contribute_performance.md.32708dc6.lean.js
rename to assets/docs_contribute_performance.md.4ff20e3f.lean.js
index 4185fcbb3c..d31174e4df 100644
--- a/assets/docs_contribute_performance.md.32708dc6.lean.js
+++ b/assets/docs_contribute_performance.md.4ff20e3f.lean.js
@@ -1 +1 @@
-import{_ as s,o as e,c as a,Q as n}from"./chunks/framework.725e5b03.js";const E=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"docs/contribute/performance.md","filePath":"docs/contribute/performance.md","lastUpdated":1701052174000}'),o={name:"docs/contribute/performance.md"},l=n("",22),p=[l];function t(c,r,i,d,y,u){return e(),a("div",null,p)}const m=s(o,[["render",t]]);export{E as __pageData,m as default};
+import{_ as s,o as e,c as a,Q as n}from"./chunks/framework.725e5b03.js";const E=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"docs/contribute/performance.md","filePath":"docs/contribute/performance.md","lastUpdated":1701053760000}'),o={name:"docs/contribute/performance.md"},l=n("",22),p=[l];function t(c,r,i,d,y,u){return e(),a("div",null,p)}const m=s(o,[["render",t]]);export{E as __pageData,m as default};
diff --git a/assets/docs_contribute_prettier.md.ed67e286.js b/assets/docs_contribute_prettier.md.d0e1731d.js
similarity index 89%
rename from assets/docs_contribute_prettier.md.ed67e286.js
rename to assets/docs_contribute_prettier.md.d0e1731d.js
index 896927ca38..8f6b74b5fb 100644
--- a/assets/docs_contribute_prettier.md.ed67e286.js
+++ b/assets/docs_contribute_prettier.md.d0e1731d.js
@@ -1 +1 @@
-import{_ as t,o as r,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Prettier","description":"","frontmatter":{"title":"Prettier","outline":"deep"},"headers":[],"relativePath":"docs/contribute/prettier.md","filePath":"docs/contribute/prettier.md","lastUpdated":1701052174000}'),i={name:"docs/contribute/prettier.md"},s=e("h1",{id:"prettier",tabindex:"-1"},[o("Prettier "),e("a",{class:"header-anchor",href:"#prettier","aria-label":'Permalink to "Prettier"'},"​")],-1),c=[s];function n(d,p,l,_,h,m){return r(),a("div",null,c)}const P=t(i,[["render",n]]);export{u as __pageData,P as default};
+import{_ as t,o as r,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Prettier","description":"","frontmatter":{"title":"Prettier","outline":"deep"},"headers":[],"relativePath":"docs/contribute/prettier.md","filePath":"docs/contribute/prettier.md","lastUpdated":1701053760000}'),i={name:"docs/contribute/prettier.md"},s=e("h1",{id:"prettier",tabindex:"-1"},[o("Prettier "),e("a",{class:"header-anchor",href:"#prettier","aria-label":'Permalink to "Prettier"'},"​")],-1),c=[s];function n(d,p,l,_,h,m){return r(),a("div",null,c)}const P=t(i,[["render",n]]);export{u as __pageData,P as default};
diff --git a/assets/docs_contribute_prettier.md.ed67e286.lean.js b/assets/docs_contribute_prettier.md.d0e1731d.lean.js
similarity index 89%
rename from assets/docs_contribute_prettier.md.ed67e286.lean.js
rename to assets/docs_contribute_prettier.md.d0e1731d.lean.js
index 896927ca38..8f6b74b5fb 100644
--- a/assets/docs_contribute_prettier.md.ed67e286.lean.js
+++ b/assets/docs_contribute_prettier.md.d0e1731d.lean.js
@@ -1 +1 @@
-import{_ as t,o as r,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Prettier","description":"","frontmatter":{"title":"Prettier","outline":"deep"},"headers":[],"relativePath":"docs/contribute/prettier.md","filePath":"docs/contribute/prettier.md","lastUpdated":1701052174000}'),i={name:"docs/contribute/prettier.md"},s=e("h1",{id:"prettier",tabindex:"-1"},[o("Prettier "),e("a",{class:"header-anchor",href:"#prettier","aria-label":'Permalink to "Prettier"'},"​")],-1),c=[s];function n(d,p,l,_,h,m){return r(),a("div",null,c)}const P=t(i,[["render",n]]);export{u as __pageData,P as default};
+import{_ as t,o as r,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Prettier","description":"","frontmatter":{"title":"Prettier","outline":"deep"},"headers":[],"relativePath":"docs/contribute/prettier.md","filePath":"docs/contribute/prettier.md","lastUpdated":1701053760000}'),i={name:"docs/contribute/prettier.md"},s=e("h1",{id:"prettier",tabindex:"-1"},[o("Prettier "),e("a",{class:"header-anchor",href:"#prettier","aria-label":'Permalink to "Prettier"'},"​")],-1),c=[s];function n(d,p,l,_,h,m){return r(),a("div",null,c)}const P=t(i,[["render",n]]);export{u as __pageData,P as default};
diff --git a/assets/docs_contribute_resolver.md.668d9bbb.js b/assets/docs_contribute_resolver.md.841f60b8.js
similarity index 94%
rename from assets/docs_contribute_resolver.md.668d9bbb.js
rename to assets/docs_contribute_resolver.md.841f60b8.js
index b1ba73f37b..15d9d30d54 100644
--- a/assets/docs_contribute_resolver.md.668d9bbb.js
+++ b/assets/docs_contribute_resolver.md.841f60b8.js
@@ -1 +1 @@
-import{_ as o,o as r,c as t,k as e,a as s}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep"},"headers":[],"relativePath":"docs/contribute/resolver.md","filePath":"docs/contribute/resolver.md","lastUpdated":1701052174000}'),a={name:"docs/contribute/resolver.md"},l=e("h1",{id:"resolver",tabindex:"-1"},[s("Resolver "),e("a",{class:"header-anchor",href:"#resolver","aria-label":'Permalink to "Resolver"'},"​")],-1),n=e("p",null,"Module resolution plays a crucial role in JavaScript tooling, especially for tasks like multi-file analysis or bundling. However, it can often become a performance bottleneck. To address this, we are actively working on porting [enhanced-resolve].",-1),i=e("p",null,"[eslint-plugin-import] will be our first application for the resolver, since it is currently a performance and complexity blocker for a lot of projects.",-1),c=[l,n,i];function d(p,u,_,f,v,m){return r(),t("div",null,c)}const k=o(a,[["render",d]]);export{b as __pageData,k as default};
+import{_ as o,o as r,c as t,k as e,a as s}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep"},"headers":[],"relativePath":"docs/contribute/resolver.md","filePath":"docs/contribute/resolver.md","lastUpdated":1701053760000}'),a={name:"docs/contribute/resolver.md"},l=e("h1",{id:"resolver",tabindex:"-1"},[s("Resolver "),e("a",{class:"header-anchor",href:"#resolver","aria-label":'Permalink to "Resolver"'},"​")],-1),n=e("p",null,"Module resolution plays a crucial role in JavaScript tooling, especially for tasks like multi-file analysis or bundling. However, it can often become a performance bottleneck. To address this, we are actively working on porting [enhanced-resolve].",-1),i=e("p",null,"[eslint-plugin-import] will be our first application for the resolver, since it is currently a performance and complexity blocker for a lot of projects.",-1),c=[l,n,i];function d(p,u,_,f,v,m){return r(),t("div",null,c)}const k=o(a,[["render",d]]);export{b as __pageData,k as default};
diff --git a/assets/docs_contribute_resolver.md.668d9bbb.lean.js b/assets/docs_contribute_resolver.md.841f60b8.lean.js
similarity index 94%
rename from assets/docs_contribute_resolver.md.668d9bbb.lean.js
rename to assets/docs_contribute_resolver.md.841f60b8.lean.js
index b1ba73f37b..15d9d30d54 100644
--- a/assets/docs_contribute_resolver.md.668d9bbb.lean.js
+++ b/assets/docs_contribute_resolver.md.841f60b8.lean.js
@@ -1 +1 @@
-import{_ as o,o as r,c as t,k as e,a as s}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep"},"headers":[],"relativePath":"docs/contribute/resolver.md","filePath":"docs/contribute/resolver.md","lastUpdated":1701052174000}'),a={name:"docs/contribute/resolver.md"},l=e("h1",{id:"resolver",tabindex:"-1"},[s("Resolver "),e("a",{class:"header-anchor",href:"#resolver","aria-label":'Permalink to "Resolver"'},"​")],-1),n=e("p",null,"Module resolution plays a crucial role in JavaScript tooling, especially for tasks like multi-file analysis or bundling. However, it can often become a performance bottleneck. To address this, we are actively working on porting [enhanced-resolve].",-1),i=e("p",null,"[eslint-plugin-import] will be our first application for the resolver, since it is currently a performance and complexity blocker for a lot of projects.",-1),c=[l,n,i];function d(p,u,_,f,v,m){return r(),t("div",null,c)}const k=o(a,[["render",d]]);export{b as __pageData,k as default};
+import{_ as o,o as r,c as t,k as e,a as s}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep"},"headers":[],"relativePath":"docs/contribute/resolver.md","filePath":"docs/contribute/resolver.md","lastUpdated":1701053760000}'),a={name:"docs/contribute/resolver.md"},l=e("h1",{id:"resolver",tabindex:"-1"},[s("Resolver "),e("a",{class:"header-anchor",href:"#resolver","aria-label":'Permalink to "Resolver"'},"​")],-1),n=e("p",null,"Module resolution plays a crucial role in JavaScript tooling, especially for tasks like multi-file analysis or bundling. However, it can often become a performance bottleneck. To address this, we are actively working on porting [enhanced-resolve].",-1),i=e("p",null,"[eslint-plugin-import] will be our first application for the resolver, since it is currently a performance and complexity blocker for a lot of projects.",-1),c=[l,n,i];function d(p,u,_,f,v,m){return r(),t("div",null,c)}const k=o(a,[["render",d]]);export{b as __pageData,k as default};
diff --git a/assets/docs_contribute_showcase.md.04c27e6a.js b/assets/docs_contribute_showcase.md.030540b5.js
similarity index 93%
rename from assets/docs_contribute_showcase.md.04c27e6a.js
rename to assets/docs_contribute_showcase.md.030540b5.js
index c23410c4f8..95438ad654 100644
--- a/assets/docs_contribute_showcase.md.04c27e6a.js
+++ b/assets/docs_contribute_showcase.md.030540b5.js
@@ -1 +1 @@
-import{_ as a,o,c as s,k as e,a as t}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Showcase","description":"","frontmatter":{"title":"Showcase","outline":"deep"},"headers":[],"relativePath":"docs/contribute/showcase.md","filePath":"docs/contribute/showcase.md","lastUpdated":1701052174000}'),c={name:"docs/contribute/showcase.md"},r=e("h1",{id:"showcase",tabindex:"-1"},[t("Showcase "),e("a",{class:"header-anchor",href:"#showcase","aria-label":'Permalink to "Showcase"'},"​")],-1),n=e("p",null,[t("Example PRs adding "),e("code",null,"oxlint"),t(":")],-1),l=e("ul",null,[e("li",null,[e("a",{href:"https://github.com/toeverything/AFFiNE/pull/4867",target:"_blank",rel:"noreferrer"},"Affine")]),e("li",null,[e("a",{href:"https://github.com/oxc-project/rspack/pull/3999",target:"_blank",rel:"noreferrer"},"Rspack")])],-1),i=[r,n,l];function h(d,p,_,u,f,m){return o(),s("div",null,i)}const k=a(c,[["render",h]]);export{b as __pageData,k as default};
+import{_ as a,o,c as s,k as e,a as t}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Showcase","description":"","frontmatter":{"title":"Showcase","outline":"deep"},"headers":[],"relativePath":"docs/contribute/showcase.md","filePath":"docs/contribute/showcase.md","lastUpdated":1701053760000}'),c={name:"docs/contribute/showcase.md"},r=e("h1",{id:"showcase",tabindex:"-1"},[t("Showcase "),e("a",{class:"header-anchor",href:"#showcase","aria-label":'Permalink to "Showcase"'},"​")],-1),n=e("p",null,[t("Example PRs adding "),e("code",null,"oxlint"),t(":")],-1),l=e("ul",null,[e("li",null,[e("a",{href:"https://github.com/toeverything/AFFiNE/pull/4867",target:"_blank",rel:"noreferrer"},"Affine")]),e("li",null,[e("a",{href:"https://github.com/oxc-project/rspack/pull/3999",target:"_blank",rel:"noreferrer"},"Rspack")])],-1),i=[r,n,l];function h(d,p,_,u,f,m){return o(),s("div",null,i)}const k=a(c,[["render",h]]);export{b as __pageData,k as default};
diff --git a/assets/docs_contribute_showcase.md.04c27e6a.lean.js b/assets/docs_contribute_showcase.md.030540b5.lean.js
similarity index 93%
rename from assets/docs_contribute_showcase.md.04c27e6a.lean.js
rename to assets/docs_contribute_showcase.md.030540b5.lean.js
index c23410c4f8..95438ad654 100644
--- a/assets/docs_contribute_showcase.md.04c27e6a.lean.js
+++ b/assets/docs_contribute_showcase.md.030540b5.lean.js
@@ -1 +1 @@
-import{_ as a,o,c as s,k as e,a as t}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Showcase","description":"","frontmatter":{"title":"Showcase","outline":"deep"},"headers":[],"relativePath":"docs/contribute/showcase.md","filePath":"docs/contribute/showcase.md","lastUpdated":1701052174000}'),c={name:"docs/contribute/showcase.md"},r=e("h1",{id:"showcase",tabindex:"-1"},[t("Showcase "),e("a",{class:"header-anchor",href:"#showcase","aria-label":'Permalink to "Showcase"'},"​")],-1),n=e("p",null,[t("Example PRs adding "),e("code",null,"oxlint"),t(":")],-1),l=e("ul",null,[e("li",null,[e("a",{href:"https://github.com/toeverything/AFFiNE/pull/4867",target:"_blank",rel:"noreferrer"},"Affine")]),e("li",null,[e("a",{href:"https://github.com/oxc-project/rspack/pull/3999",target:"_blank",rel:"noreferrer"},"Rspack")])],-1),i=[r,n,l];function h(d,p,_,u,f,m){return o(),s("div",null,i)}const k=a(c,[["render",h]]);export{b as __pageData,k as default};
+import{_ as a,o,c as s,k as e,a as t}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Showcase","description":"","frontmatter":{"title":"Showcase","outline":"deep"},"headers":[],"relativePath":"docs/contribute/showcase.md","filePath":"docs/contribute/showcase.md","lastUpdated":1701053760000}'),c={name:"docs/contribute/showcase.md"},r=e("h1",{id:"showcase",tabindex:"-1"},[t("Showcase "),e("a",{class:"header-anchor",href:"#showcase","aria-label":'Permalink to "Showcase"'},"​")],-1),n=e("p",null,[t("Example PRs adding "),e("code",null,"oxlint"),t(":")],-1),l=e("ul",null,[e("li",null,[e("a",{href:"https://github.com/toeverything/AFFiNE/pull/4867",target:"_blank",rel:"noreferrer"},"Affine")]),e("li",null,[e("a",{href:"https://github.com/oxc-project/rspack/pull/3999",target:"_blank",rel:"noreferrer"},"Rspack")])],-1),i=[r,n,l];function h(d,p,_,u,f,m){return o(),s("div",null,i)}const k=a(c,[["render",h]]);export{b as __pageData,k as default};
diff --git a/assets/docs_contribute_transformer.md.d026b587.js b/assets/docs_contribute_transformer.md.16592f8f.js
similarity index 93%
rename from assets/docs_contribute_transformer.md.d026b587.js
rename to assets/docs_contribute_transformer.md.16592f8f.js
index 21cc671afc..84288bd520 100644
--- a/assets/docs_contribute_transformer.md.d026b587.js
+++ b/assets/docs_contribute_transformer.md.16592f8f.js
@@ -1 +1 @@
-import{_ as t,o,c as s,k as e,a as r}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"docs/contribute/transformer.md","filePath":"docs/contribute/transformer.md","lastUpdated":1701052174000}'),a={name:"docs/contribute/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[r("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=e("p",null,[r("A transformer is responsible for turning higher versions of ECMAScript to a lower version that can be used in older browsers. We are currently focusing on an esnext to es2015 transpiler. See the "),e("a",{href:"https://github.com/oxc-project/oxc/issues/974",target:"_blank",rel:"noreferrer"},"umbrella issue"),r(" for details.")],-1),i=[n,c];function l(d,f,m,p,h,u){return o(),s("div",null,i)}const x=t(a,[["render",l]]);export{b as __pageData,x as default};
+import{_ as t,o,c as s,k as e,a as r}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"docs/contribute/transformer.md","filePath":"docs/contribute/transformer.md","lastUpdated":1701053760000}'),a={name:"docs/contribute/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[r("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=e("p",null,[r("A transformer is responsible for turning higher versions of ECMAScript to a lower version that can be used in older browsers. We are currently focusing on an esnext to es2015 transpiler. See the "),e("a",{href:"https://github.com/oxc-project/oxc/issues/974",target:"_blank",rel:"noreferrer"},"umbrella issue"),r(" for details.")],-1),i=[n,c];function l(d,f,m,p,h,u){return o(),s("div",null,i)}const x=t(a,[["render",l]]);export{b as __pageData,x as default};
diff --git a/assets/docs_contribute_transformer.md.d026b587.lean.js b/assets/docs_contribute_transformer.md.16592f8f.lean.js
similarity index 93%
rename from assets/docs_contribute_transformer.md.d026b587.lean.js
rename to assets/docs_contribute_transformer.md.16592f8f.lean.js
index 21cc671afc..84288bd520 100644
--- a/assets/docs_contribute_transformer.md.d026b587.lean.js
+++ b/assets/docs_contribute_transformer.md.16592f8f.lean.js
@@ -1 +1 @@
-import{_ as t,o,c as s,k as e,a as r}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"docs/contribute/transformer.md","filePath":"docs/contribute/transformer.md","lastUpdated":1701052174000}'),a={name:"docs/contribute/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[r("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=e("p",null,[r("A transformer is responsible for turning higher versions of ECMAScript to a lower version that can be used in older browsers. We are currently focusing on an esnext to es2015 transpiler. See the "),e("a",{href:"https://github.com/oxc-project/oxc/issues/974",target:"_blank",rel:"noreferrer"},"umbrella issue"),r(" for details.")],-1),i=[n,c];function l(d,f,m,p,h,u){return o(),s("div",null,i)}const x=t(a,[["render",l]]);export{b as __pageData,x as default};
+import{_ as t,o,c as s,k as e,a as r}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"docs/contribute/transformer.md","filePath":"docs/contribute/transformer.md","lastUpdated":1701053760000}'),a={name:"docs/contribute/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[r("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=e("p",null,[r("A transformer is responsible for turning higher versions of ECMAScript to a lower version that can be used in older browsers. We are currently focusing on an esnext to es2015 transpiler. See the "),e("a",{href:"https://github.com/oxc-project/oxc/issues/974",target:"_blank",rel:"noreferrer"},"umbrella issue"),r(" for details.")],-1),i=[n,c];function l(d,f,m,p,h,u){return o(),s("div",null,i)}const x=t(a,[["render",l]]);export{b as __pageData,x as default};
diff --git a/assets/docs_contribute_vscode.md.dfac2403.js b/assets/docs_contribute_vscode.md.4c08a98c.js
similarity index 95%
rename from assets/docs_contribute_vscode.md.dfac2403.js
rename to assets/docs_contribute_vscode.md.4c08a98c.js
index 98a1e30ea4..81274ab70f 100644
--- a/assets/docs_contribute_vscode.md.dfac2403.js
+++ b/assets/docs_contribute_vscode.md.4c08a98c.js
@@ -1 +1 @@
-import{_ as e,o,c as t,Q as d}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"VSCode Extension","description":"","frontmatter":{"title":"VSCode Extension","outline":"deep"},"headers":[],"relativePath":"docs/contribute/vscode.md","filePath":"docs/contribute/vscode.md","lastUpdated":1701052174000}'),n={name:"docs/contribute/vscode.md"},i=d('<h1 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Build the extension and run it inside vscode:</p><ol><li><code>pnpm install</code></li><li><code>pnpm run build</code></li><li><code>pnpm run package</code></li><li>open vscode and run the command palette &quot;Extensions: Install from VSIX...&quot;</li><li>find the <code>oxc-vscode-x.x.x.vsix</code> file from <code>./editor/vscode</code> directory</li><li>open a <code>.js</code> / <code>.ts</code> file, add <code>debugger;</code> and save</li><li>see the warning <code>eslint(no-debugger): debugger statement is not allowed - oxc</code></li></ol>',4),c=[i];function a(s,l,r,p,_,u){return o(),t("div",null,c)}const x=e(n,[["render",a]]);export{h as __pageData,x as default};
+import{_ as e,o,c as t,Q as d}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"VSCode Extension","description":"","frontmatter":{"title":"VSCode Extension","outline":"deep"},"headers":[],"relativePath":"docs/contribute/vscode.md","filePath":"docs/contribute/vscode.md","lastUpdated":1701053760000}'),n={name:"docs/contribute/vscode.md"},i=d('<h1 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Build the extension and run it inside vscode:</p><ol><li><code>pnpm install</code></li><li><code>pnpm run build</code></li><li><code>pnpm run package</code></li><li>open vscode and run the command palette &quot;Extensions: Install from VSIX...&quot;</li><li>find the <code>oxc-vscode-x.x.x.vsix</code> file from <code>./editor/vscode</code> directory</li><li>open a <code>.js</code> / <code>.ts</code> file, add <code>debugger;</code> and save</li><li>see the warning <code>eslint(no-debugger): debugger statement is not allowed - oxc</code></li></ol>',4),c=[i];function a(s,l,r,p,_,u){return o(),t("div",null,c)}const x=e(n,[["render",a]]);export{h as __pageData,x as default};
diff --git a/assets/docs_contribute_vscode.md.dfac2403.lean.js b/assets/docs_contribute_vscode.md.4c08a98c.lean.js
similarity index 86%
rename from assets/docs_contribute_vscode.md.dfac2403.lean.js
rename to assets/docs_contribute_vscode.md.4c08a98c.lean.js
index 7626923b1b..ebe3428402 100644
--- a/assets/docs_contribute_vscode.md.dfac2403.lean.js
+++ b/assets/docs_contribute_vscode.md.4c08a98c.lean.js
@@ -1 +1 @@
-import{_ as e,o,c as t,Q as d}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"VSCode Extension","description":"","frontmatter":{"title":"VSCode Extension","outline":"deep"},"headers":[],"relativePath":"docs/contribute/vscode.md","filePath":"docs/contribute/vscode.md","lastUpdated":1701052174000}'),n={name:"docs/contribute/vscode.md"},i=d("",4),c=[i];function a(s,l,r,p,_,u){return o(),t("div",null,c)}const x=e(n,[["render",a]]);export{h as __pageData,x as default};
+import{_ as e,o,c as t,Q as d}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"VSCode Extension","description":"","frontmatter":{"title":"VSCode Extension","outline":"deep"},"headers":[],"relativePath":"docs/contribute/vscode.md","filePath":"docs/contribute/vscode.md","lastUpdated":1701053760000}'),n={name:"docs/contribute/vscode.md"},i=d("",4),c=[i];function a(s,l,r,p,_,u){return o(),t("div",null,c)}const x=e(n,[["render",a]]);export{h as __pageData,x as default};
diff --git a/assets/docs_guide_benchmarks.md.426cf9b1.js b/assets/docs_guide_benchmarks.md.f62b4c74.js
similarity index 90%
rename from assets/docs_guide_benchmarks.md.426cf9b1.js
rename to assets/docs_guide_benchmarks.md.f62b4c74.js
index f5c86c96ac..7eeed2370b 100644
--- a/assets/docs_guide_benchmarks.md.426cf9b1.js
+++ b/assets/docs_guide_benchmarks.md.f62b4c74.js
@@ -1 +1 @@
-import{_ as a,o as s,c as t,k as e,a as c}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"docs/guide/benchmarks.md","filePath":"docs/guide/benchmarks.md","lastUpdated":1701052174000}'),r={name:"docs/guide/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[c("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=e("p",null,"TBD",-1),d=[n,o];function i(h,m,l,_,k,p){return s(),t("div",null,d)}const b=a(r,[["render",i]]);export{f as __pageData,b as default};
+import{_ as a,o as s,c as t,k as e,a as c}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"docs/guide/benchmarks.md","filePath":"docs/guide/benchmarks.md","lastUpdated":1701053760000}'),r={name:"docs/guide/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[c("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=e("p",null,"TBD",-1),d=[n,o];function i(h,m,l,_,k,p){return s(),t("div",null,d)}const b=a(r,[["render",i]]);export{f as __pageData,b as default};
diff --git a/assets/docs_guide_benchmarks.md.426cf9b1.lean.js b/assets/docs_guide_benchmarks.md.f62b4c74.lean.js
similarity index 90%
rename from assets/docs_guide_benchmarks.md.426cf9b1.lean.js
rename to assets/docs_guide_benchmarks.md.f62b4c74.lean.js
index f5c86c96ac..7eeed2370b 100644
--- a/assets/docs_guide_benchmarks.md.426cf9b1.lean.js
+++ b/assets/docs_guide_benchmarks.md.f62b4c74.lean.js
@@ -1 +1 @@
-import{_ as a,o as s,c as t,k as e,a as c}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"docs/guide/benchmarks.md","filePath":"docs/guide/benchmarks.md","lastUpdated":1701052174000}'),r={name:"docs/guide/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[c("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=e("p",null,"TBD",-1),d=[n,o];function i(h,m,l,_,k,p){return s(),t("div",null,d)}const b=a(r,[["render",i]]);export{f as __pageData,b as default};
+import{_ as a,o as s,c as t,k as e,a as c}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"docs/guide/benchmarks.md","filePath":"docs/guide/benchmarks.md","lastUpdated":1701053760000}'),r={name:"docs/guide/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[c("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=e("p",null,"TBD",-1),d=[n,o];function i(h,m,l,_,k,p){return s(),t("div",null,d)}const b=a(r,[["render",i]]);export{f as __pageData,b as default};
diff --git a/assets/docs_guide_introduction.md.138c6418.js b/assets/docs_guide_introduction.md.62db88d2.js
similarity index 93%
rename from assets/docs_guide_introduction.md.138c6418.js
rename to assets/docs_guide_introduction.md.62db88d2.js
index 6c51416ba1..460103ae76 100644
--- a/assets/docs_guide_introduction.md.138c6418.js
+++ b/assets/docs_guide_introduction.md.62db88d2.js
@@ -1 +1 @@
-import{V as a}from"./chunks/theme.996dd6ef.js";import{o as t,c as r,H as o,l as e,Q as i}from"./chunks/framework.725e5b03.js";import{C as s}from"./chunks/team.fcc5c8bb.js";const n=i('<h1 id="what-is-oxc" tabindex="-1">What is OXC? <a class="header-anchor" href="#what-is-oxc" aria-label="Permalink to &quot;What is OXC?&quot;">​</a></h1><p>The Oxidation Compiler is a collection of high-performance tools for the JavaScript and TypeScript language.</p><p>We are building a parser, linter, formatter, transpiler, minifier, resolver ... all written in Rust.</p><p>Our goal is to create and empower the fastest and most user friendly tools for <a href="https://www.swyx.io/js-third-age" target="_blank" rel="noreferrer">The Third Age of JavaScript</a>.</p><h2 id="philosophy" tabindex="-1">Philosophy <a class="header-anchor" href="#philosophy" aria-label="Permalink to &quot;Philosophy&quot;">​</a></h2><p>This project shares the same philosophies as <a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a> and <a href="https://beta.ruff.rs" target="_blank" rel="noreferrer">Ruff</a>.</p><ol><li>JavaScript tooling could be rewritten in a more performant language.</li><li>An integrated toolchain can tap into efficiencies that are not available to a disparate set of tools.</li></ol><h2 id="core-team" tabindex="-1">Core Team <a class="header-anchor" href="#core-team" aria-label="Permalink to &quot;Core Team&quot;">​</a></h2>',8),u=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/guide/introduction.md","filePath":"docs/guide/introduction.md","lastUpdated":1701052174000}'),l={name:"docs/guide/introduction.md"},_=Object.assign(l,{setup(h){return(c,d)=>(t(),r("div",null,[n,o(e(a),{size:"medium",members:e(s)},null,8,["members"])]))}});export{u as __pageData,_ as default};
+import{V as a}from"./chunks/theme.be7b3ccb.js";import{o as t,c as r,H as o,l as e,Q as i}from"./chunks/framework.725e5b03.js";import{C as s}from"./chunks/team.fcc5c8bb.js";const n=i('<h1 id="what-is-oxc" tabindex="-1">What is OXC? <a class="header-anchor" href="#what-is-oxc" aria-label="Permalink to &quot;What is OXC?&quot;">​</a></h1><p>The Oxidation Compiler is a collection of high-performance tools for the JavaScript and TypeScript language.</p><p>We are building a parser, linter, formatter, transpiler, minifier, resolver ... all written in Rust.</p><p>Our goal is to create and empower the fastest and most user friendly tools for <a href="https://www.swyx.io/js-third-age" target="_blank" rel="noreferrer">The Third Age of JavaScript</a>.</p><h2 id="philosophy" tabindex="-1">Philosophy <a class="header-anchor" href="#philosophy" aria-label="Permalink to &quot;Philosophy&quot;">​</a></h2><p>This project shares the same philosophies as <a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a> and <a href="https://beta.ruff.rs" target="_blank" rel="noreferrer">Ruff</a>.</p><ol><li>JavaScript tooling could be rewritten in a more performant language.</li><li>An integrated toolchain can tap into efficiencies that are not available to a disparate set of tools.</li></ol><h2 id="core-team" tabindex="-1">Core Team <a class="header-anchor" href="#core-team" aria-label="Permalink to &quot;Core Team&quot;">​</a></h2>',8),u=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/guide/introduction.md","filePath":"docs/guide/introduction.md","lastUpdated":1701053760000}'),l={name:"docs/guide/introduction.md"},_=Object.assign(l,{setup(h){return(c,d)=>(t(),r("div",null,[n,o(e(a),{size:"medium",members:e(s)},null,8,["members"])]))}});export{u as __pageData,_ as default};
diff --git a/assets/docs_guide_introduction.md.138c6418.lean.js b/assets/docs_guide_introduction.md.62db88d2.lean.js
similarity index 79%
rename from assets/docs_guide_introduction.md.138c6418.lean.js
rename to assets/docs_guide_introduction.md.62db88d2.lean.js
index 5915ca3d11..f456c7d2d0 100644
--- a/assets/docs_guide_introduction.md.138c6418.lean.js
+++ b/assets/docs_guide_introduction.md.62db88d2.lean.js
@@ -1 +1 @@
-import{V as a}from"./chunks/theme.996dd6ef.js";import{o as t,c as r,H as o,l as e,Q as i}from"./chunks/framework.725e5b03.js";import{C as s}from"./chunks/team.fcc5c8bb.js";const n=i("",8),u=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/guide/introduction.md","filePath":"docs/guide/introduction.md","lastUpdated":1701052174000}'),l={name:"docs/guide/introduction.md"},_=Object.assign(l,{setup(h){return(c,d)=>(t(),r("div",null,[n,o(e(a),{size:"medium",members:e(s)},null,8,["members"])]))}});export{u as __pageData,_ as default};
+import{V as a}from"./chunks/theme.be7b3ccb.js";import{o as t,c as r,H as o,l as e,Q as i}from"./chunks/framework.725e5b03.js";import{C as s}from"./chunks/team.fcc5c8bb.js";const n=i("",8),u=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/guide/introduction.md","filePath":"docs/guide/introduction.md","lastUpdated":1701053760000}'),l={name:"docs/guide/introduction.md"},_=Object.assign(l,{setup(h){return(c,d)=>(t(),r("div",null,[n,o(e(a),{size:"medium",members:e(s)},null,8,["members"])]))}});export{u as __pageData,_ as default};
diff --git a/assets/docs_guide_philosophy.md.d9540af9.js b/assets/docs_guide_philosophy.md.2be5f5f9.js
similarity index 90%
rename from assets/docs_guide_philosophy.md.d9540af9.js
rename to assets/docs_guide_philosophy.md.2be5f5f9.js
index 85a22442b8..20953bbb51 100644
--- a/assets/docs_guide_philosophy.md.d9540af9.js
+++ b/assets/docs_guide_philosophy.md.2be5f5f9.js
@@ -1 +1 @@
-import{_ as o,o as s,c as t,k as e,a}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"docs/guide/philosophy.md","filePath":"docs/guide/philosophy.md","lastUpdated":1701052174000}'),i={name:"docs/guide/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[a("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=e("p",null,"TBD",-1),l=[h,p];function d(c,r,n,_,m,u){return s(),t("div",null,l)}const P=o(i,[["render",d]]);export{f as __pageData,P as default};
+import{_ as o,o as s,c as t,k as e,a}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"docs/guide/philosophy.md","filePath":"docs/guide/philosophy.md","lastUpdated":1701053760000}'),i={name:"docs/guide/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[a("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=e("p",null,"TBD",-1),l=[h,p];function d(c,r,n,_,m,u){return s(),t("div",null,l)}const P=o(i,[["render",d]]);export{f as __pageData,P as default};
diff --git a/assets/docs_guide_philosophy.md.d9540af9.lean.js b/assets/docs_guide_philosophy.md.2be5f5f9.lean.js
similarity index 90%
rename from assets/docs_guide_philosophy.md.d9540af9.lean.js
rename to assets/docs_guide_philosophy.md.2be5f5f9.lean.js
index 85a22442b8..20953bbb51 100644
--- a/assets/docs_guide_philosophy.md.d9540af9.lean.js
+++ b/assets/docs_guide_philosophy.md.2be5f5f9.lean.js
@@ -1 +1 @@
-import{_ as o,o as s,c as t,k as e,a}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"docs/guide/philosophy.md","filePath":"docs/guide/philosophy.md","lastUpdated":1701052174000}'),i={name:"docs/guide/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[a("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=e("p",null,"TBD",-1),l=[h,p];function d(c,r,n,_,m,u){return s(),t("div",null,l)}const P=o(i,[["render",d]]);export{f as __pageData,P as default};
+import{_ as o,o as s,c as t,k as e,a}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"docs/guide/philosophy.md","filePath":"docs/guide/philosophy.md","lastUpdated":1701053760000}'),i={name:"docs/guide/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[a("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=e("p",null,"TBD",-1),l=[h,p];function d(c,r,n,_,m,u){return s(),t("div",null,l)}const P=o(i,[["render",d]]);export{f as __pageData,P as default};
diff --git a/assets/docs_guide_usage_benchmarks.md.cf30d29b.js b/assets/docs_guide_usage_benchmarks.md.64291503.js
similarity index 80%
rename from assets/docs_guide_usage_benchmarks.md.cf30d29b.js
rename to assets/docs_guide_usage_benchmarks.md.64291503.js
index 74b8d25759..b18aa1cda5 100644
--- a/assets/docs_guide_usage_benchmarks.md.cf30d29b.js
+++ b/assets/docs_guide_usage_benchmarks.md.64291503.js
@@ -1 +1 @@
-import{_ as a,o as s,c as t,k as e,a as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"docs/guide/usage/benchmarks.md","filePath":"docs/guide/usage/benchmarks.md","lastUpdated":1701052174000}'),c={name:"docs/guide/usage/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[r("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=[n];function d(i,h,m,l,_,k){return s(),t("div",null,o)}const f=a(c,[["render",d]]);export{u as __pageData,f as default};
+import{_ as a,o as s,c as t,k as e,a as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"docs/guide/usage/benchmarks.md","filePath":"docs/guide/usage/benchmarks.md","lastUpdated":1701053760000}'),c={name:"docs/guide/usage/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[r("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=[n];function d(i,h,m,l,_,k){return s(),t("div",null,o)}const f=a(c,[["render",d]]);export{u as __pageData,f as default};
diff --git a/assets/docs_guide_usage_benchmarks.md.cf30d29b.lean.js b/assets/docs_guide_usage_benchmarks.md.64291503.lean.js
similarity index 80%
rename from assets/docs_guide_usage_benchmarks.md.cf30d29b.lean.js
rename to assets/docs_guide_usage_benchmarks.md.64291503.lean.js
index 74b8d25759..b18aa1cda5 100644
--- a/assets/docs_guide_usage_benchmarks.md.cf30d29b.lean.js
+++ b/assets/docs_guide_usage_benchmarks.md.64291503.lean.js
@@ -1 +1 @@
-import{_ as a,o as s,c as t,k as e,a as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"docs/guide/usage/benchmarks.md","filePath":"docs/guide/usage/benchmarks.md","lastUpdated":1701052174000}'),c={name:"docs/guide/usage/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[r("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=[n];function d(i,h,m,l,_,k){return s(),t("div",null,o)}const f=a(c,[["render",d]]);export{u as __pageData,f as default};
+import{_ as a,o as s,c as t,k as e,a as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"docs/guide/usage/benchmarks.md","filePath":"docs/guide/usage/benchmarks.md","lastUpdated":1701053760000}'),c={name:"docs/guide/usage/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[r("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=[n];function d(i,h,m,l,_,k){return s(),t("div",null,o)}const f=a(c,[["render",d]]);export{u as __pageData,f as default};
diff --git a/assets/docs_guide_usage_linter.md.be302645.js b/assets/docs_guide_usage_linter.md.45344b17.js
similarity index 95%
rename from assets/docs_guide_usage_linter.md.be302645.js
rename to assets/docs_guide_usage_linter.md.45344b17.js
index fffd85b478..7d094bf114 100644
--- a/assets/docs_guide_usage_linter.md.be302645.js
+++ b/assets/docs_guide_usage_linter.md.45344b17.js
@@ -1,4 +1,4 @@
-import{_ as a,C as n,o as l,c as e,H as o,Q as p}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxlint","alt":"npm"},{"src":"https://img.shields.io/github/stars/oxc-project/oxc","alt":"GitHub Repo stars"}]},"headers":[],"relativePath":"docs/guide/usage/linter.md","filePath":"docs/guide/usage/linter.md","lastUpdated":1701052174000}'),t={name:"docs/guide/usage/linter.md"},c=p(`<h1 id="oxlint" tabindex="-1">oxlint <a class="header-anchor" href="#oxlint" aria-label="Permalink to &quot;oxlint&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>Runs 50-100x faster than ESLint, and scales with the number of CPU cores (<a href="https://github.com/oxc-project/bench-javascript-linter" target="_blank" rel="noreferrer">Benchmark</a>)</li><li>No configuration required</li><li>Convention over configuration</li><li>Reports errors and useless code by default</li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/ignore#the-eslintignore-file" target="_blank" rel="noreferrer">.eslintignore</a></li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/rules#disabling-rules" target="_blank" rel="noreferrer">ESLint comment disabling</a></li></ul><h2 id="adoptions" tabindex="-1">Adoptions <a class="header-anchor" href="#adoptions" aria-label="Permalink to &quot;Adoptions&quot;">​</a></h2><ul><li>A 5M LOC typescript codebase previously running ESLint parallelized across 48 workers in CI taking 75 mins (12m wall time), it is now 8 seconds on a single worker. (<a href="https://twitter.com/boshen_c/status/1714827365136929029" target="_blank" rel="noreferrer">Source</a>)</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><p>Install <a href="https://www.npmjs.com/package/oxlint" target="_blank" rel="noreferrer">oxlint</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-_hhsH" id="tab-6GppXzw" checked="checked"><label for="tab-6GppXzw">npm</label><input type="radio" name="group-_hhsH" id="tab-l5thYWt"><label for="tab-l5thYWt">pnpm</label><input type="radio" name="group-_hhsH" id="tab-TiucKSj"><label for="tab-TiucKSj">yarn</label><input type="radio" name="group-_hhsH" id="tab-dQsjuvO"><label for="tab-dQsjuvO">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div></div></div><p>You can also run oxlint directly:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Riy2d" id="tab-F4SY9pK" checked="checked"><label for="tab-F4SY9pK">npm</label><input type="radio" name="group-Riy2d" id="tab-lPaUQgL"><label for="tab-lPaUQgL">pnpm</label><input type="radio" name="group-Riy2d" id="tab-xXKwqqD"><label for="tab-xXKwqqD">yarn</label><input type="radio" name="group-Riy2d" id="tab-wuwk7gj"><label for="tab-wuwk7gj">bun</label><input type="radio" name="group-Riy2d" id="tab-w3ddpH_"><label for="tab-w3ddpH_">deno</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bunx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bunx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">deno</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">deno</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div></div></div><p>You can download the binary files from <a href="https://github.com/oxc-project/oxc/releases/latest" target="_blank" rel="noreferrer">the latest GitHub releases</a>.</p><h2 id="integration" tabindex="-1">Integration <a class="header-anchor" href="#integration" aria-label="Permalink to &quot;Integration&quot;">​</a></h2><h3 id="ides" tabindex="-1">IDEs <a class="header-anchor" href="#ides" aria-label="Permalink to &quot;IDEs&quot;">​</a></h3><h4 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h4><p>You can download <a href="https://marketplace.visualstudio.com/items?itemName=oxc.oxc-vscode" target="_blank" rel="noreferrer">the official VSCode extension</a>.</p><h4 id="vim-nvim-coc" tabindex="-1">Vim / Nvim (coc) <a class="header-anchor" href="#vim-nvim-coc" aria-label="Permalink to &quot;Vim / Nvim (coc)&quot;">​</a></h4><p>Add the following config to <code>coc-settings.json</code>:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">{</span></span>
+import{_ as a,C as n,o as l,c as e,H as o,Q as p}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxlint","alt":"npm"},{"src":"https://img.shields.io/github/stars/oxc-project/oxc","alt":"GitHub Repo stars"}]},"headers":[],"relativePath":"docs/guide/usage/linter.md","filePath":"docs/guide/usage/linter.md","lastUpdated":1701053760000}'),t={name:"docs/guide/usage/linter.md"},c=p(`<h1 id="oxlint" tabindex="-1">oxlint <a class="header-anchor" href="#oxlint" aria-label="Permalink to &quot;oxlint&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>Runs 50-100x faster than ESLint, and scales with the number of CPU cores (<a href="https://github.com/oxc-project/bench-javascript-linter" target="_blank" rel="noreferrer">Benchmark</a>)</li><li>No configuration required</li><li>Convention over configuration</li><li>Reports errors and useless code by default</li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/ignore#the-eslintignore-file" target="_blank" rel="noreferrer">.eslintignore</a></li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/rules#disabling-rules" target="_blank" rel="noreferrer">ESLint comment disabling</a></li></ul><h2 id="adoptions" tabindex="-1">Adoptions <a class="header-anchor" href="#adoptions" aria-label="Permalink to &quot;Adoptions&quot;">​</a></h2><ul><li>A 5M LOC typescript codebase previously running ESLint parallelized across 48 workers in CI taking 75 mins (12m wall time), it is now 8 seconds on a single worker. (<a href="https://twitter.com/boshen_c/status/1714827365136929029" target="_blank" rel="noreferrer">Source</a>)</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><p>Install <a href="https://www.npmjs.com/package/oxlint" target="_blank" rel="noreferrer">oxlint</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group--BL5E" id="tab-gbbDrBZ" checked="checked"><label for="tab-gbbDrBZ">npm</label><input type="radio" name="group--BL5E" id="tab-fv_5etY"><label for="tab-fv_5etY">pnpm</label><input type="radio" name="group--BL5E" id="tab-4Hkdl67"><label for="tab-4Hkdl67">yarn</label><input type="radio" name="group--BL5E" id="tab-nVz4bes"><label for="tab-nVz4bes">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div></div></div><p>You can also run oxlint directly:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-CAB58" id="tab-ooZdjBP" checked="checked"><label for="tab-ooZdjBP">npm</label><input type="radio" name="group-CAB58" id="tab-ASCwe8-"><label for="tab-ASCwe8-">pnpm</label><input type="radio" name="group-CAB58" id="tab-SCuVYYO"><label for="tab-SCuVYYO">yarn</label><input type="radio" name="group-CAB58" id="tab-DlKUPmn"><label for="tab-DlKUPmn">bun</label><input type="radio" name="group-CAB58" id="tab-UBDTJVK"><label for="tab-UBDTJVK">deno</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bunx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bunx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">deno</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">deno</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div></div></div><p>You can download the binary files from <a href="https://github.com/oxc-project/oxc/releases/latest" target="_blank" rel="noreferrer">the latest GitHub releases</a>.</p><h2 id="integration" tabindex="-1">Integration <a class="header-anchor" href="#integration" aria-label="Permalink to &quot;Integration&quot;">​</a></h2><h3 id="ides" tabindex="-1">IDEs <a class="header-anchor" href="#ides" aria-label="Permalink to &quot;IDEs&quot;">​</a></h3><h4 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h4><p>You can download <a href="https://marketplace.visualstudio.com/items?itemName=oxc.oxc-vscode" target="_blank" rel="noreferrer">the official VSCode extension</a>.</p><h4 id="vim-nvim-coc" tabindex="-1">Vim / Nvim (coc) <a class="header-anchor" href="#vim-nvim-coc" aria-label="Permalink to &quot;Vim / Nvim (coc)&quot;">​</a></h4><p>Add the following config to <code>coc-settings.json</code>:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">{</span></span>
 <span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#9ECBFF;">&quot;languageserver&quot;</span><span style="color:#E1E4E8;">: {</span></span>
 <span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#9ECBFF;">&quot;oxc&quot;</span><span style="color:#E1E4E8;">: {</span></span>
 <span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#9ECBFF;">&quot;command&quot;</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">&quot;oxc_vscode&quot;</span><span style="color:#E1E4E8;">,</span></span>
@@ -74,4 +74,4 @@ import{_ as a,C as n,o as l,c as e,H as o,Q as p}from"./chunks/framework.725e5b0
 <span class="line"><span style="color:#24292e;">    PATH                      Single file, single path or list of paths</span></span>
 <span class="line"><span style="color:#24292e;"></span></span>
 <span class="line"><span style="color:#24292e;">Available options:</span></span>
-<span class="line"><span style="color:#24292e;">    -h, --help                Prints help information</span></span></code></pre></div></li></ul><h2 id="system-requirements" tabindex="-1">System Requirements <a class="header-anchor" href="#system-requirements" aria-label="Permalink to &quot;System Requirements&quot;">​</a></h2><p><code>oxlint</code> is built for the following systems:</p><ul><li>darwin-arm64</li><li>darwin-x64</li><li>linux-arm64</li><li>linux-x64</li><li>win32-arm64</li><li>win32-x64</li></ul>`,29);function r(i,d,y,E,u,h){const s=n("AppBadgeList");return l(),e("div",null,[o(s),c])}const F=a(t,[["render",r]]);export{b as __pageData,F as default};
+<span class="line"><span style="color:#24292e;">    -h, --help                Prints help information</span></span></code></pre></div></li></ul><h2 id="system-requirements" tabindex="-1">System Requirements <a class="header-anchor" href="#system-requirements" aria-label="Permalink to &quot;System Requirements&quot;">​</a></h2><p><code>oxlint</code> is built for the following systems:</p><ul><li>darwin-arm64</li><li>darwin-x64</li><li>linux-arm64</li><li>linux-x64</li><li>win32-arm64</li><li>win32-x64</li></ul>`,29);function r(i,d,y,E,u,h){const s=n("AppBadgeList");return l(),e("div",null,[o(s),c])}const m=a(t,[["render",r]]);export{b as __pageData,m as default};
diff --git a/assets/docs_guide_usage_linter.md.be302645.lean.js b/assets/docs_guide_usage_linter.md.45344b17.lean.js
similarity index 75%
rename from assets/docs_guide_usage_linter.md.be302645.lean.js
rename to assets/docs_guide_usage_linter.md.45344b17.lean.js
index 006a7d16d9..57dd95731a 100644
--- a/assets/docs_guide_usage_linter.md.be302645.lean.js
+++ b/assets/docs_guide_usage_linter.md.45344b17.lean.js
@@ -1 +1 @@
-import{_ as a,C as n,o as l,c as e,H as o,Q as p}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxlint","alt":"npm"},{"src":"https://img.shields.io/github/stars/oxc-project/oxc","alt":"GitHub Repo stars"}]},"headers":[],"relativePath":"docs/guide/usage/linter.md","filePath":"docs/guide/usage/linter.md","lastUpdated":1701052174000}'),t={name:"docs/guide/usage/linter.md"},c=p("",29);function r(i,d,y,E,u,h){const s=n("AppBadgeList");return l(),e("div",null,[o(s),c])}const F=a(t,[["render",r]]);export{b as __pageData,F as default};
+import{_ as a,C as n,o as l,c as e,H as o,Q as p}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxlint","alt":"npm"},{"src":"https://img.shields.io/github/stars/oxc-project/oxc","alt":"GitHub Repo stars"}]},"headers":[],"relativePath":"docs/guide/usage/linter.md","filePath":"docs/guide/usage/linter.md","lastUpdated":1701053760000}'),t={name:"docs/guide/usage/linter.md"},c=p("",29);function r(i,d,y,E,u,h){const s=n("AppBadgeList");return l(),e("div",null,[o(s),c])}const m=a(t,[["render",r]]);export{b as __pageData,m as default};
diff --git a/assets/docs_guide_usage_parser.md.a90d6882.js b/assets/docs_guide_usage_parser.md.879fa23a.js
similarity index 93%
rename from assets/docs_guide_usage_parser.md.a90d6882.js
rename to assets/docs_guide_usage_parser.md.879fa23a.js
index d65162cec8..c319858687 100644
--- a/assets/docs_guide_usage_parser.md.a90d6882.js
+++ b/assets/docs_guide_usage_parser.md.879fa23a.js
@@ -1 +1 @@
-import{_ as a,C as e,o as l,c as p,H as o,Q as n}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-parser","alt":"npm"}]},"headers":[],"relativePath":"docs/guide/usage/parser.md","filePath":"docs/guide/usage/parser.md","lastUpdated":1701052174000}'),t={name:"docs/guide/usage/parser.md"},r=n('<h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>2x faster then <a href="https://swc.rs" target="_blank" rel="noreferrer">SWC</a> parser</li><li>By far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust</li></ul><p>You can check <a href="https://github.com/oxc-project/bench-javascript-parser-written-in-rust" target="_blank" rel="noreferrer">benchmark</a> for more detail.</p><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install crates:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_ast</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_ast</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_parser</span></span></code></pre></div><ul><li>The umbrella crate <a href="https://docs.rs/oxc" target="_blank" rel="noreferrer">oxc</a> exports all public crates from this repository</li><li>The AST and parser crates <a href="https://docs.rs/oxc_ast" target="_blank" rel="noreferrer">oxc_ast</a> and <a href="https://docs.rs/oxc_parser" target="_blank" rel="noreferrer">oxc_parser</a> are production ready</li></ul><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-parser" target="_blank" rel="noreferrer">oxc-parser</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-FcJNA" id="tab-52jy92S" checked="checked"><label for="tab-52jy92S">npm</label><input type="radio" name="group-FcJNA" id="tab-b07dXS3"><label for="tab-b07dXS3">pnpm</label><input type="radio" name="group-FcJNA" id="tab-NRdCGvg"><label for="tab-NRdCGvg">yarn</label><input type="radio" name="group-FcJNA" id="tab-gseGihw"><label for="tab-gseGihw">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div>',14);function c(i,d,y,E,h,F){const s=e("AppBadgeList");return l(),p("div",null,[o(s),r])}const b=a(t,[["render",c]]);export{g as __pageData,b as default};
+import{_ as a,C as e,o as l,c as p,H as o,Q as n}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-parser","alt":"npm"}]},"headers":[],"relativePath":"docs/guide/usage/parser.md","filePath":"docs/guide/usage/parser.md","lastUpdated":1701053760000}'),r={name:"docs/guide/usage/parser.md"},t=n('<h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>2x faster then <a href="https://swc.rs" target="_blank" rel="noreferrer">SWC</a> parser</li><li>By far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust</li></ul><p>You can check <a href="https://github.com/oxc-project/bench-javascript-parser-written-in-rust" target="_blank" rel="noreferrer">benchmark</a> for more detail.</p><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install crates:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_ast</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_ast</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_parser</span></span></code></pre></div><ul><li>The umbrella crate <a href="https://docs.rs/oxc" target="_blank" rel="noreferrer">oxc</a> exports all public crates from this repository</li><li>The AST and parser crates <a href="https://docs.rs/oxc_ast" target="_blank" rel="noreferrer">oxc_ast</a> and <a href="https://docs.rs/oxc_parser" target="_blank" rel="noreferrer">oxc_parser</a> are production ready</li></ul><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-parser" target="_blank" rel="noreferrer">oxc-parser</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-zr1Qn" id="tab-nFZbvPz" checked="checked"><label for="tab-nFZbvPz">npm</label><input type="radio" name="group-zr1Qn" id="tab-zlWuI9t"><label for="tab-zlWuI9t">pnpm</label><input type="radio" name="group-zr1Qn" id="tab-XVilwKA"><label for="tab-XVilwKA">yarn</label><input type="radio" name="group-zr1Qn" id="tab-JpiTRod"><label for="tab-JpiTRod">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div>',14);function c(i,d,y,E,h,u){const s=e("AppBadgeList");return l(),p("div",null,[o(s),t])}const b=a(r,[["render",c]]);export{g as __pageData,b as default};
diff --git a/assets/docs_guide_usage_parser.md.a90d6882.lean.js b/assets/docs_guide_usage_parser.md.879fa23a.lean.js
similarity index 56%
rename from assets/docs_guide_usage_parser.md.a90d6882.lean.js
rename to assets/docs_guide_usage_parser.md.879fa23a.lean.js
index 18ed997529..2f7d7ed510 100644
--- a/assets/docs_guide_usage_parser.md.a90d6882.lean.js
+++ b/assets/docs_guide_usage_parser.md.879fa23a.lean.js
@@ -1 +1 @@
-import{_ as a,C as e,o as l,c as p,H as o,Q as n}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-parser","alt":"npm"}]},"headers":[],"relativePath":"docs/guide/usage/parser.md","filePath":"docs/guide/usage/parser.md","lastUpdated":1701052174000}'),t={name:"docs/guide/usage/parser.md"},r=n("",14);function c(i,d,y,E,h,F){const s=e("AppBadgeList");return l(),p("div",null,[o(s),r])}const b=a(t,[["render",c]]);export{g as __pageData,b as default};
+import{_ as a,C as e,o as l,c as p,H as o,Q as n}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-parser","alt":"npm"}]},"headers":[],"relativePath":"docs/guide/usage/parser.md","filePath":"docs/guide/usage/parser.md","lastUpdated":1701053760000}'),r={name:"docs/guide/usage/parser.md"},t=n("",14);function c(i,d,y,E,h,u){const s=e("AppBadgeList");return l(),p("div",null,[o(s),t])}const b=a(r,[["render",c]]);export{g as __pageData,b as default};
diff --git a/assets/docs_guide_usage_philosophy.md.7fb423b5.js b/assets/docs_guide_usage_philosophy.md.57f130a7.js
similarity index 80%
rename from assets/docs_guide_usage_philosophy.md.7fb423b5.js
rename to assets/docs_guide_usage_philosophy.md.57f130a7.js
index 6519dc186e..1adceccfeb 100644
--- a/assets/docs_guide_usage_philosophy.md.7fb423b5.js
+++ b/assets/docs_guide_usage_philosophy.md.57f130a7.js
@@ -1 +1 @@
-import{_ as o,o as s,c as a,k as e,a as t}from"./chunks/framework.725e5b03.js";const y=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"docs/guide/usage/philosophy.md","filePath":"docs/guide/usage/philosophy.md","lastUpdated":1701052174000}'),i={name:"docs/guide/usage/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[t("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=[h];function d(l,r,c,n,_,u){return s(),a("div",null,p)}const f=o(i,[["render",d]]);export{y as __pageData,f as default};
+import{_ as o,o as s,c as a,k as e,a as t}from"./chunks/framework.725e5b03.js";const y=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"docs/guide/usage/philosophy.md","filePath":"docs/guide/usage/philosophy.md","lastUpdated":1701053760000}'),i={name:"docs/guide/usage/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[t("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=[h];function d(l,r,c,n,_,u){return s(),a("div",null,p)}const f=o(i,[["render",d]]);export{y as __pageData,f as default};
diff --git a/assets/docs_guide_usage_philosophy.md.7fb423b5.lean.js b/assets/docs_guide_usage_philosophy.md.57f130a7.lean.js
similarity index 80%
rename from assets/docs_guide_usage_philosophy.md.7fb423b5.lean.js
rename to assets/docs_guide_usage_philosophy.md.57f130a7.lean.js
index 6519dc186e..1adceccfeb 100644
--- a/assets/docs_guide_usage_philosophy.md.7fb423b5.lean.js
+++ b/assets/docs_guide_usage_philosophy.md.57f130a7.lean.js
@@ -1 +1 @@
-import{_ as o,o as s,c as a,k as e,a as t}from"./chunks/framework.725e5b03.js";const y=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"docs/guide/usage/philosophy.md","filePath":"docs/guide/usage/philosophy.md","lastUpdated":1701052174000}'),i={name:"docs/guide/usage/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[t("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=[h];function d(l,r,c,n,_,u){return s(),a("div",null,p)}const f=o(i,[["render",d]]);export{y as __pageData,f as default};
+import{_ as o,o as s,c as a,k as e,a as t}from"./chunks/framework.725e5b03.js";const y=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"docs/guide/usage/philosophy.md","filePath":"docs/guide/usage/philosophy.md","lastUpdated":1701053760000}'),i={name:"docs/guide/usage/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[t("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=[h];function d(l,r,c,n,_,u){return s(),a("div",null,p)}const f=o(i,[["render",d]]);export{y as __pageData,f as default};
diff --git a/assets/docs_guide_usage_resolver.md.60e2e81f.js b/assets/docs_guide_usage_resolver.md.c3f62e0b.js
similarity index 96%
rename from assets/docs_guide_usage_resolver.md.60e2e81f.js
rename to assets/docs_guide_usage_resolver.md.c3f62e0b.js
index c4b62a76bf..0b47c3a85a 100644
--- a/assets/docs_guide_usage_resolver.md.60e2e81f.js
+++ b/assets/docs_guide_usage_resolver.md.c3f62e0b.js
@@ -1,4 +1,4 @@
-import{_ as a,C as n,o as l,c as p,H as o,Q as e}from"./chunks/framework.725e5b03.js";const C=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-resolver","alt":"npm"}]},"headers":[],"relativePath":"docs/guide/usage/resolver.md","filePath":"docs/guide/usage/resolver.md","lastUpdated":1701052174000}'),t={name:"docs/guide/usage/resolver.md"},r=e(`<h1 id="resolver" tabindex="-1">Resolver <a class="header-anchor" href="#resolver" aria-label="Permalink to &quot;Resolver&quot;">​</a></h1><p>Node.js Module Resolution.</p><ul><li>Feature complete</li><li>All configuration options are aligned with enhanced-resolve</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install <a href="https://crates.io/oxc_resolver" target="_blank" rel="noreferrer">oxc_resolver</a> crate:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_resolver</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_resolver</span></span></code></pre></div><p>You should also check <a href="https://docs.rs/oxc_resolver" target="_blank" rel="noreferrer">documentation</a>.</p><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-resolver" target="_blank" rel="noreferrer">oxc-resolver</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Us1dm" id="tab-Vh13kih" checked="checked"><label for="tab-Vh13kih">npm</label><input type="radio" name="group-Us1dm" id="tab-JCEcXHz"><label for="tab-JCEcXHz">pnpm</label><input type="radio" name="group-Us1dm" id="tab-CMxSnfk"><label for="tab-CMxSnfk">yarn</label><input type="radio" name="group-Us1dm" id="tab-G-K99LS"><label for="tab-G-K99LS">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div><h2 id="example" tabindex="-1">Example <a class="header-anchor" href="#example" aria-label="Permalink to &quot;Example&quot;">​</a></h2><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{env, </span><span style="color:#B392F0;">path</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">PathBuf</span><span style="color:#E1E4E8;">};</span></span>
+import{_ as a,C as n,o as l,c as p,H as o,Q as e}from"./chunks/framework.725e5b03.js";const v=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-resolver","alt":"npm"}]},"headers":[],"relativePath":"docs/guide/usage/resolver.md","filePath":"docs/guide/usage/resolver.md","lastUpdated":1701053760000}'),t={name:"docs/guide/usage/resolver.md"},r=e(`<h1 id="resolver" tabindex="-1">Resolver <a class="header-anchor" href="#resolver" aria-label="Permalink to &quot;Resolver&quot;">​</a></h1><p>Node.js Module Resolution.</p><ul><li>Feature complete</li><li>All configuration options are aligned with enhanced-resolve</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install <a href="https://crates.io/oxc_resolver" target="_blank" rel="noreferrer">oxc_resolver</a> crate:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_resolver</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_resolver</span></span></code></pre></div><p>You should also check <a href="https://docs.rs/oxc_resolver" target="_blank" rel="noreferrer">documentation</a>.</p><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-resolver" target="_blank" rel="noreferrer">oxc-resolver</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Wp9DI" id="tab-_x4twk3" checked="checked"><label for="tab-_x4twk3">npm</label><input type="radio" name="group-Wp9DI" id="tab-gvFGXZ3"><label for="tab-gvFGXZ3">pnpm</label><input type="radio" name="group-Wp9DI" id="tab-HMIFqif"><label for="tab-HMIFqif">yarn</label><input type="radio" name="group-Wp9DI" id="tab-z72l28Z"><label for="tab-z72l28Z">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div><h2 id="example" tabindex="-1">Example <a class="header-anchor" href="#example" aria-label="Permalink to &quot;Example&quot;">​</a></h2><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{env, </span><span style="color:#B392F0;">path</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">PathBuf</span><span style="color:#E1E4E8;">};</span></span>
 <span class="line"></span>
 <span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">oxc_resolver</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{</span><span style="color:#B392F0;">ResolveOptions</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">Resolver</span><span style="color:#E1E4E8;">};</span></span>
 <span class="line"></span>
@@ -30,4 +30,4 @@ import{_ as a,C as n,o as l,c as p,H as o,Q as e}from"./chunks/framework.725e5b0
 <span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Err</span><span style="color:#24292E;">(error) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;Error: {error}&quot;</span><span style="color:#24292E;">),</span></span>
 <span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Ok</span><span style="color:#24292E;">(resolution) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;Resolved: {}&quot;</span><span style="color:#24292E;">, resolution</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">full_path</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">to_string_lossy</span><span style="color:#24292E;">()),</span></span>
 <span class="line"><span style="color:#24292E;">    }</span></span>
-<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div>`,13);function c(y,E,i,F,d,u){const s=n("AppBadgeList");return l(),p("div",null,[o(s),r])}const v=a(t,[["render",c]]);export{C as __pageData,v as default};
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div>`,13);function c(y,E,i,F,d,u){const s=n("AppBadgeList");return l(),p("div",null,[o(s),r])}const C=a(t,[["render",c]]);export{v as __pageData,C as default};
diff --git a/assets/docs_guide_usage_resolver.md.60e2e81f.lean.js b/assets/docs_guide_usage_resolver.md.c3f62e0b.lean.js
similarity index 63%
rename from assets/docs_guide_usage_resolver.md.60e2e81f.lean.js
rename to assets/docs_guide_usage_resolver.md.c3f62e0b.lean.js
index 5975ed358f..15861e4491 100644
--- a/assets/docs_guide_usage_resolver.md.60e2e81f.lean.js
+++ b/assets/docs_guide_usage_resolver.md.c3f62e0b.lean.js
@@ -1 +1 @@
-import{_ as a,C as n,o as l,c as p,H as o,Q as e}from"./chunks/framework.725e5b03.js";const C=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-resolver","alt":"npm"}]},"headers":[],"relativePath":"docs/guide/usage/resolver.md","filePath":"docs/guide/usage/resolver.md","lastUpdated":1701052174000}'),t={name:"docs/guide/usage/resolver.md"},r=e("",13);function c(y,E,i,F,d,u){const s=n("AppBadgeList");return l(),p("div",null,[o(s),r])}const v=a(t,[["render",c]]);export{C as __pageData,v as default};
+import{_ as a,C as n,o as l,c as p,H as o,Q as e}from"./chunks/framework.725e5b03.js";const v=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-resolver","alt":"npm"}]},"headers":[],"relativePath":"docs/guide/usage/resolver.md","filePath":"docs/guide/usage/resolver.md","lastUpdated":1701053760000}'),t={name:"docs/guide/usage/resolver.md"},r=e("",13);function c(y,E,i,F,d,u){const s=n("AppBadgeList");return l(),p("div",null,[o(s),r])}const C=a(t,[["render",c]]);export{v as __pageData,C as default};
diff --git a/assets/docs_learn_architecture_formatter.md.80783d23.js b/assets/docs_learn_architecture_formatter.md.b8f08359.js
similarity index 90%
rename from assets/docs_learn_architecture_formatter.md.80783d23.js
rename to assets/docs_learn_architecture_formatter.md.b8f08359.js
index 3692937242..20ebcbed30 100644
--- a/assets/docs_learn_architecture_formatter.md.80783d23.js
+++ b/assets/docs_learn_architecture_formatter.md.b8f08359.js
@@ -1 +1 @@
-import{_ as t,o as r,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Formatter","description":"","frontmatter":{"title":"Formatter","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/formatter.md","filePath":"docs/learn/architecture/formatter.md","lastUpdated":1701052174000}'),c={name:"docs/learn/architecture/formatter.md"},s=e("h1",{id:"formatter",tabindex:"-1"},[o("Formatter "),e("a",{class:"header-anchor",href:"#formatter","aria-label":'Permalink to "Formatter"'},"​")],-1),n=[s];function d(i,m,l,f,_,h){return r(),a("div",null,n)}const x=t(c,[["render",d]]);export{u as __pageData,x as default};
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diff --git a/assets/docs_learn_architecture_formatter.md.80783d23.lean.js b/assets/docs_learn_architecture_formatter.md.b8f08359.lean.js
similarity index 90%
rename from assets/docs_learn_architecture_formatter.md.80783d23.lean.js
rename to assets/docs_learn_architecture_formatter.md.b8f08359.lean.js
index 3692937242..20ebcbed30 100644
--- a/assets/docs_learn_architecture_formatter.md.80783d23.lean.js
+++ b/assets/docs_learn_architecture_formatter.md.b8f08359.lean.js
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diff --git a/assets/docs_learn_architecture_introduction.md.da9ddefa.js b/assets/docs_learn_architecture_introduction.md.5fdf9f2b.js
similarity index 90%
rename from assets/docs_learn_architecture_introduction.md.da9ddefa.js
rename to assets/docs_learn_architecture_introduction.md.5fdf9f2b.js
index 2ff1d000bc..7833e5158f 100644
--- a/assets/docs_learn_architecture_introduction.md.da9ddefa.js
+++ b/assets/docs_learn_architecture_introduction.md.5fdf9f2b.js
@@ -1 +1 @@
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+import{_ as e,o,c as n,k as t,a as r}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/introduction.md","filePath":"docs/learn/architecture/introduction.md","lastUpdated":1701053760000}'),a={name:"docs/learn/architecture/introduction.md"},c=t("h1",{id:"introduction",tabindex:"-1"},[r("Introduction "),t("a",{class:"header-anchor",href:"#introduction","aria-label":'Permalink to "Introduction"'},"​")],-1),i=[c];function d(s,l,u,_,h,p){return o(),n("div",null,i)}const x=e(a,[["render",d]]);export{f as __pageData,x as default};
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similarity index 90%
rename from assets/docs_learn_architecture_introduction.md.da9ddefa.lean.js
rename to assets/docs_learn_architecture_introduction.md.5fdf9f2b.lean.js
index 2ff1d000bc..7833e5158f 100644
--- a/assets/docs_learn_architecture_introduction.md.da9ddefa.lean.js
+++ b/assets/docs_learn_architecture_introduction.md.5fdf9f2b.lean.js
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+import{_ as e,o,c as n,k as t,a as r}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/introduction.md","filePath":"docs/learn/architecture/introduction.md","lastUpdated":1701053760000}'),a={name:"docs/learn/architecture/introduction.md"},c=t("h1",{id:"introduction",tabindex:"-1"},[r("Introduction "),t("a",{class:"header-anchor",href:"#introduction","aria-label":'Permalink to "Introduction"'},"​")],-1),i=[c];function d(s,l,u,_,h,p){return o(),n("div",null,i)}const x=e(a,[["render",d]]);export{f as __pageData,x as default};
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similarity index 91%
rename from assets/docs_learn_architecture_linter.md.12e3a00b.js
rename to assets/docs_learn_architecture_linter.md.2f9c0c5d.js
index 61ba422d4e..df175944f5 100644
--- a/assets/docs_learn_architecture_linter.md.12e3a00b.js
+++ b/assets/docs_learn_architecture_linter.md.2f9c0c5d.js
@@ -1 +1 @@
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diff --git a/assets/docs_learn_architecture_linter.md.12e3a00b.lean.js b/assets/docs_learn_architecture_linter.md.2f9c0c5d.lean.js
similarity index 91%
rename from assets/docs_learn_architecture_linter.md.12e3a00b.lean.js
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index 61ba422d4e..df175944f5 100644
--- a/assets/docs_learn_architecture_linter.md.12e3a00b.lean.js
+++ b/assets/docs_learn_architecture_linter.md.2f9c0c5d.lean.js
@@ -1 +1 @@
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diff --git a/assets/docs_learn_architecture_minifier.md.bc5e2ca4.js b/assets/docs_learn_architecture_minifier.md.661eaafc.js
similarity index 80%
rename from assets/docs_learn_architecture_minifier.md.bc5e2ca4.js
rename to assets/docs_learn_architecture_minifier.md.661eaafc.js
index 537ec2bcbf..2cc6f6cbd4 100644
--- a/assets/docs_learn_architecture_minifier.md.bc5e2ca4.js
+++ b/assets/docs_learn_architecture_minifier.md.661eaafc.js
@@ -1 +1 @@
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similarity index 80%
rename from assets/docs_learn_architecture_minifier.md.bc5e2ca4.lean.js
rename to assets/docs_learn_architecture_minifier.md.661eaafc.lean.js
index 537ec2bcbf..2cc6f6cbd4 100644
--- a/assets/docs_learn_architecture_minifier.md.bc5e2ca4.lean.js
+++ b/assets/docs_learn_architecture_minifier.md.661eaafc.lean.js
@@ -1 +1 @@
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+import{_ as i,o as t,c as r,k as e,a}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Minifier","description":"","frontmatter":{"title":"Minifier","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/minifier.md","filePath":"docs/learn/architecture/minifier.md","lastUpdated":1701053760000}'),n={name:"docs/learn/architecture/minifier.md"},c=e("h1",{id:"minifier",tabindex:"-1"},[a("Minifier "),e("a",{class:"header-anchor",href:"#minifier","aria-label":'Permalink to "Minifier"'},"​")],-1),o=[c];function s(d,f,l,m,_,h){return t(),r("div",null,o)}const x=i(n,[["render",s]]);export{u as __pageData,x as default};
diff --git a/assets/docs_learn_architecture_parser.md.4ee292fb.js b/assets/docs_learn_architecture_parser.md.4234e563.js
similarity index 97%
rename from assets/docs_learn_architecture_parser.md.4ee292fb.js
rename to assets/docs_learn_architecture_parser.md.4234e563.js
index 7a533cbbf0..e443e46a19 100644
--- a/assets/docs_learn_architecture_parser.md.4ee292fb.js
+++ b/assets/docs_learn_architecture_parser.md.4234e563.js
@@ -1 +1 @@
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+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/parser.md","filePath":"docs/learn/architecture/parser.md","lastUpdated":1701053760000}'),i={name:"docs/learn/architecture/parser.md"},o=r('<h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>Oxc maintains its own AST and parser, which is by far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust.</p><p>As the parser often represents a key performance bottleneck in JavaScript tooling, any minor improvements can have a cascading effect on our downstream tools. By developing our parser, we have the opportunity to explore and implement well-researched performance techniques.</p><p>While many existing JavaScript tools rely on [estree] as their AST specification, a notable drawback is its abundance of ambiguous nodes. This ambiguity often leads to confusion during development with [estree].</p><p>The Oxc AST differs slightly from the [estree] AST by removing ambiguous nodes and introducing distinct types. For example, instead of using a generic [estree] <code>Identifier</code>, the Oxc AST provides specific types such as <code>BindingIdentifier</code>, <code>IdentifierReference</code>, and <code>IdentifierName</code>.</p><p>This clear distinction greatly enhances the development experience by aligning more closely with the ECMAScript specification.</p><h2 id="how-is-it-so-fast" tabindex="-1">How is it so fast <a class="header-anchor" href="#how-is-it-so-fast" aria-label="Permalink to &quot;How is it so fast&quot;">​</a></h2><ul><li>AST is allocated in a <a href="https://crates.io/crates/bumpalo" target="_blank" rel="noreferrer">memory arena</a> for fast AST memory allocation and deallocation</li><li>Short strings are inlined by <a href="https://crates.io/crates/compact_str" target="_blank" rel="noreferrer">CompactString</a></li><li>No other heap allocations are done except the above two</li><li>Scope binding, symbol resolution and some syntax errors are not done in the parser, they are delegated to the semantic analyzer</li></ul>',8),n=[o];function s(c,l,d,p,h,f){return a(),t("div",null,n)}const _=e(i,[["render",s]]);export{u as __pageData,_ as default};
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similarity index 87%
rename from assets/docs_learn_architecture_parser.md.4ee292fb.lean.js
rename to assets/docs_learn_architecture_parser.md.4234e563.lean.js
index e38cf163b3..6434e20cb6 100644
--- a/assets/docs_learn_architecture_parser.md.4ee292fb.lean.js
+++ b/assets/docs_learn_architecture_parser.md.4234e563.lean.js
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+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/parser.md","filePath":"docs/learn/architecture/parser.md","lastUpdated":1701053760000}'),i={name:"docs/learn/architecture/parser.md"},o=r("",8),n=[o];function s(c,l,d,p,h,f){return a(),t("div",null,n)}const _=e(i,[["render",s]]);export{u as __pageData,_ as default};
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similarity index 90%
rename from assets/docs_learn_architecture_resolver.md.06afd529.js
rename to assets/docs_learn_architecture_resolver.md.cfbd489f.js
index 52bda621b2..b4520ed8b1 100644
--- a/assets/docs_learn_architecture_resolver.md.06afd529.js
+++ b/assets/docs_learn_architecture_resolver.md.cfbd489f.js
@@ -1 +1 @@
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+import{_ as r,o as t,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/resolver.md","filePath":"docs/learn/architecture/resolver.md","lastUpdated":1701053760000}'),s={name:"docs/learn/architecture/resolver.md"},c=e("h1",{id:"resolver",tabindex:"-1"},[o("Resolver "),e("a",{class:"header-anchor",href:"#resolver","aria-label":'Permalink to "Resolver"'},"​")],-1),l=[c];function n(d,i,_,h,p,v){return t(),a("div",null,l)}const u=r(s,[["render",n]]);export{f as __pageData,u as default};
diff --git a/assets/docs_learn_architecture_resolver.md.06afd529.lean.js b/assets/docs_learn_architecture_resolver.md.cfbd489f.lean.js
similarity index 90%
rename from assets/docs_learn_architecture_resolver.md.06afd529.lean.js
rename to assets/docs_learn_architecture_resolver.md.cfbd489f.lean.js
index 52bda621b2..b4520ed8b1 100644
--- a/assets/docs_learn_architecture_resolver.md.06afd529.lean.js
+++ b/assets/docs_learn_architecture_resolver.md.cfbd489f.lean.js
@@ -1 +1 @@
-import{_ as r,o as t,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/resolver.md","filePath":"docs/learn/architecture/resolver.md","lastUpdated":1701052174000}'),s={name:"docs/learn/architecture/resolver.md"},c=e("h1",{id:"resolver",tabindex:"-1"},[o("Resolver "),e("a",{class:"header-anchor",href:"#resolver","aria-label":'Permalink to "Resolver"'},"​")],-1),l=[c];function n(d,i,_,h,p,v){return t(),a("div",null,l)}const u=r(s,[["render",n]]);export{f as __pageData,u as default};
+import{_ as r,o as t,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/resolver.md","filePath":"docs/learn/architecture/resolver.md","lastUpdated":1701053760000}'),s={name:"docs/learn/architecture/resolver.md"},c=e("h1",{id:"resolver",tabindex:"-1"},[o("Resolver "),e("a",{class:"header-anchor",href:"#resolver","aria-label":'Permalink to "Resolver"'},"​")],-1),l=[c];function n(d,i,_,h,p,v){return t(),a("div",null,l)}const u=r(s,[["render",n]]);export{f as __pageData,u as default};
diff --git a/assets/docs_learn_architecture_transformer.md.8a48936b.js b/assets/docs_learn_architecture_transformer.md.48cf4290.js
similarity index 90%
rename from assets/docs_learn_architecture_transformer.md.8a48936b.js
rename to assets/docs_learn_architecture_transformer.md.48cf4290.js
index 9ca94e2b72..329c1a535f 100644
--- a/assets/docs_learn_architecture_transformer.md.8a48936b.js
+++ b/assets/docs_learn_architecture_transformer.md.48cf4290.js
@@ -1 +1 @@
-import{_ as r,o as a,c as t,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/transformer.md","filePath":"docs/learn/architecture/transformer.md","lastUpdated":1701052174000}'),s={name:"docs/learn/architecture/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[o("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=[n];function d(i,m,f,l,_,h){return a(),t("div",null,c)}const x=r(s,[["render",d]]);export{u as __pageData,x as default};
+import{_ as r,o as a,c as t,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/transformer.md","filePath":"docs/learn/architecture/transformer.md","lastUpdated":1701053760000}'),s={name:"docs/learn/architecture/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[o("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=[n];function d(i,m,f,l,_,h){return a(),t("div",null,c)}const x=r(s,[["render",d]]);export{u as __pageData,x as default};
diff --git a/assets/docs_learn_architecture_transformer.md.8a48936b.lean.js b/assets/docs_learn_architecture_transformer.md.48cf4290.lean.js
similarity index 90%
rename from assets/docs_learn_architecture_transformer.md.8a48936b.lean.js
rename to assets/docs_learn_architecture_transformer.md.48cf4290.lean.js
index 9ca94e2b72..329c1a535f 100644
--- a/assets/docs_learn_architecture_transformer.md.8a48936b.lean.js
+++ b/assets/docs_learn_architecture_transformer.md.48cf4290.lean.js
@@ -1 +1 @@
-import{_ as r,o as a,c as t,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/transformer.md","filePath":"docs/learn/architecture/transformer.md","lastUpdated":1701052174000}'),s={name:"docs/learn/architecture/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[o("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=[n];function d(i,m,f,l,_,h){return a(),t("div",null,c)}const x=r(s,[["render",d]]);export{u as __pageData,x as default};
+import{_ as r,o as a,c as t,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"docs/learn/architecture/transformer.md","filePath":"docs/learn/architecture/transformer.md","lastUpdated":1701053760000}'),s={name:"docs/learn/architecture/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[o("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=[n];function d(i,m,f,l,_,h){return a(),t("div",null,c)}const x=r(s,[["render",d]]);export{u as __pageData,x as default};
diff --git a/assets/docs_learn_ecmascript_grammar.md.e9677e24.js b/assets/docs_learn_ecmascript_grammar.md.4dc3d487.js
similarity index 99%
rename from assets/docs_learn_ecmascript_grammar.md.e9677e24.js
rename to assets/docs_learn_ecmascript_grammar.md.4dc3d487.js
index c4dc4f6ac3..d1fea5dab7 100644
--- a/assets/docs_learn_ecmascript_grammar.md.e9677e24.js
+++ b/assets/docs_learn_ecmascript_grammar.md.4dc3d487.js
@@ -1,4 +1,4 @@
-import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Grammar","description":"","frontmatter":{"title":"Grammar","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecmascript/grammar.md","filePath":"docs/learn/ecmascript/grammar.md","lastUpdated":1701052174000}'),o={name:"docs/learn/ecmascript/grammar.md"},l=e(`<p>JavaScript has one of the most challenging grammar to parse, this tutorial details all the sweat and tears I had while learning it.</p><h2 id="ll-1-grammar" tabindex="-1">LL(1) Grammar <a class="header-anchor" href="#ll-1-grammar" aria-label="Permalink to &quot;LL(1) Grammar&quot;">​</a></h2><p>According to <a href="https://en.wikipedia.org/wiki/LL_grammar" target="_blank" rel="noreferrer">Wikipedia</a>,</p><blockquote><p>an LL grammar is a context-free grammar that can be parsed by an LL parser, which parses the input from Left to right</p></blockquote><p>The first <strong>L</strong> means the scanning the source from <strong>L</strong>eft to right, and the second <strong>L</strong> means the construction of a <strong>L</strong>eftmost derivation tree.</p><p>Context-free and the (1) in LL(1) means a tree can be constructed by just peeking at the next token and nothing else.</p><p>LL Grammars are of particular interest in academia because we are lazy human beings and we want to write programs that generate parsers automatically so we don&#39;t need to write parsers by hand.</p><p>Unfortunately, most industrial programming languages do not have a nice LL(1) grammar, and this applies to JavaScript too.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>Mozilla started the <a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a> project a few years ago and wrote a <a href="https://github.com/mozilla-spidermonkey/jsparagus/tree/master/jsparagus" target="_blank" rel="noreferrer">LALR parser generator in Python</a>. They haven&#39;t updated it much in the past two years and they sent a strong message at the end of <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">js-quirks.md</a></p><blockquote><p>What have we learned today?</p><ul><li>Do not write a JS parser.</li><li>JavaScript has some syntactic horrors in it. But hey, you don&#39;t make the world&#39;s most widely used programming language by avoiding all mistakes. You do it by shipping a serviceable tool, in the right circumstances, for the right users.</li></ul></blockquote></div><hr><p>The only practical way to parse JavaScript is to write a recursive descent parser by hand because of the nature of its grammar, so let&#39;s learn all the quirks in the grammar before we shoot ourselves in the foot.</p><p>The list below starts simple and will become difficult to grasp, so please take grab a coffee and take your time.</p><h2 id="identifiers" tabindex="-1">Identifiers <a class="header-anchor" href="#identifiers" aria-label="Permalink to &quot;Identifiers&quot;">​</a></h2><p>There are three types of identifiers defined in <code>#sec-identifiers</code>,</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">IdentifierReference[Yield, Await] :</span></span>
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Grammar","description":"","frontmatter":{"title":"Grammar","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecmascript/grammar.md","filePath":"docs/learn/ecmascript/grammar.md","lastUpdated":1701053760000}'),o={name:"docs/learn/ecmascript/grammar.md"},l=e(`<p>JavaScript has one of the most challenging grammar to parse, this tutorial details all the sweat and tears I had while learning it.</p><h2 id="ll-1-grammar" tabindex="-1">LL(1) Grammar <a class="header-anchor" href="#ll-1-grammar" aria-label="Permalink to &quot;LL(1) Grammar&quot;">​</a></h2><p>According to <a href="https://en.wikipedia.org/wiki/LL_grammar" target="_blank" rel="noreferrer">Wikipedia</a>,</p><blockquote><p>an LL grammar is a context-free grammar that can be parsed by an LL parser, which parses the input from Left to right</p></blockquote><p>The first <strong>L</strong> means the scanning the source from <strong>L</strong>eft to right, and the second <strong>L</strong> means the construction of a <strong>L</strong>eftmost derivation tree.</p><p>Context-free and the (1) in LL(1) means a tree can be constructed by just peeking at the next token and nothing else.</p><p>LL Grammars are of particular interest in academia because we are lazy human beings and we want to write programs that generate parsers automatically so we don&#39;t need to write parsers by hand.</p><p>Unfortunately, most industrial programming languages do not have a nice LL(1) grammar, and this applies to JavaScript too.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>Mozilla started the <a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a> project a few years ago and wrote a <a href="https://github.com/mozilla-spidermonkey/jsparagus/tree/master/jsparagus" target="_blank" rel="noreferrer">LALR parser generator in Python</a>. They haven&#39;t updated it much in the past two years and they sent a strong message at the end of <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">js-quirks.md</a></p><blockquote><p>What have we learned today?</p><ul><li>Do not write a JS parser.</li><li>JavaScript has some syntactic horrors in it. But hey, you don&#39;t make the world&#39;s most widely used programming language by avoiding all mistakes. You do it by shipping a serviceable tool, in the right circumstances, for the right users.</li></ul></blockquote></div><hr><p>The only practical way to parse JavaScript is to write a recursive descent parser by hand because of the nature of its grammar, so let&#39;s learn all the quirks in the grammar before we shoot ourselves in the foot.</p><p>The list below starts simple and will become difficult to grasp, so please take grab a coffee and take your time.</p><h2 id="identifiers" tabindex="-1">Identifiers <a class="header-anchor" href="#identifiers" aria-label="Permalink to &quot;Identifiers&quot;">​</a></h2><p>There are three types of identifiers defined in <code>#sec-identifiers</code>,</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">IdentifierReference[Yield, Await] :</span></span>
 <span class="line"><span style="color:#e1e4e8;">BindingIdentifier[Yield, Await] :</span></span>
 <span class="line"><span style="color:#e1e4e8;">LabelIdentifier[Yield, Await] :</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">IdentifierReference[Yield, Await] :</span></span>
 <span class="line"><span style="color:#24292e;">BindingIdentifier[Yield, Await] :</span></span>
diff --git a/assets/docs_learn_ecmascript_grammar.md.e9677e24.lean.js b/assets/docs_learn_ecmascript_grammar.md.4dc3d487.lean.js
similarity index 87%
rename from assets/docs_learn_ecmascript_grammar.md.e9677e24.lean.js
rename to assets/docs_learn_ecmascript_grammar.md.4dc3d487.lean.js
index b1c92dfb31..8002e5d26b 100644
--- a/assets/docs_learn_ecmascript_grammar.md.e9677e24.lean.js
+++ b/assets/docs_learn_ecmascript_grammar.md.4dc3d487.lean.js
@@ -1 +1 @@
-import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Grammar","description":"","frontmatter":{"title":"Grammar","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecmascript/grammar.md","filePath":"docs/learn/ecmascript/grammar.md","lastUpdated":1701052174000}'),o={name:"docs/learn/ecmascript/grammar.md"},l=e("",164),p=[l];function t(r,c,i,d,y,E){return a(),n("div",null,p)}const g=s(o,[["render",t]]);export{u as __pageData,g as default};
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Grammar","description":"","frontmatter":{"title":"Grammar","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecmascript/grammar.md","filePath":"docs/learn/ecmascript/grammar.md","lastUpdated":1701053760000}'),o={name:"docs/learn/ecmascript/grammar.md"},l=e("",164),p=[l];function t(r,c,i,d,y,E){return a(),n("div",null,p)}const g=s(o,[["render",t]]);export{u as __pageData,g as default};
diff --git a/assets/docs_learn_ecmascript_spec.md.03200411.js b/assets/docs_learn_ecmascript_spec.md.c10ef8af.js
similarity index 99%
rename from assets/docs_learn_ecmascript_spec.md.03200411.js
rename to assets/docs_learn_ecmascript_spec.md.c10ef8af.js
index f0507ebc6a..fd34229f4b 100644
--- a/assets/docs_learn_ecmascript_spec.md.03200411.js
+++ b/assets/docs_learn_ecmascript_spec.md.c10ef8af.js
@@ -1,4 +1,4 @@
-import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Specification","description":"","frontmatter":{"title":"Specification","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecmascript/spec.md","filePath":"docs/learn/ecmascript/spec.md","lastUpdated":1701052174000}'),l={name:"docs/learn/ecmascript/spec.md"},o=e(`<p><a href="https://tc39.es/ecma262/" target="_blank" rel="noreferrer">The ECMAScript® 2023 Language Specification</a> details everything about the JavaScript language, so anyone can implement their own JavaScript engine.</p><p>The following chapters need to be studied for our parser:</p><ul><li>Chapter 5: Notational Conventions</li><li>Chapter 11: ECMAScript Language: Source Text</li><li>Chapter 12: ECMAScript Language: Lexical Grammar</li><li>Chapter 13 - 16: Expressions, Statements, Functions, Classes, Scripts and Modules</li><li>Annex B: Additional ECMAScript Features for Web Browsers</li><li>Annex C: The Strict Mode of ECMAScript</li></ul><p>For navigation inside the specification:</p><ul><li>Anything clickable has a permanent link, they are shown on the URL as anchors, for example <code>#sec-identifiers</code></li><li>Hovering over things may show a tooltip, clicking on <code>References</code> shows all its references</li></ul><h2 id="notational-conventions" tabindex="-1">Notational Conventions <a class="header-anchor" href="#notational-conventions" aria-label="Permalink to &quot;Notational Conventions&quot;">​</a></h2><p><a href="https://tc39.es/ecma262/#sec-grammar-notation" target="_blank" rel="noreferrer">Chapter 5.1.5 Grammar Notation</a> is the section we need to read.</p><p>The things to note here are:</p><h3 id="recursion" tabindex="-1">Recursion <a class="header-anchor" href="#recursion" aria-label="Permalink to &quot;Recursion&quot;">​</a></h3><p>This is how lists are presented in the grammar.</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ArgumentList :</span></span>
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Specification","description":"","frontmatter":{"title":"Specification","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecmascript/spec.md","filePath":"docs/learn/ecmascript/spec.md","lastUpdated":1701053760000}'),l={name:"docs/learn/ecmascript/spec.md"},o=e(`<p><a href="https://tc39.es/ecma262/" target="_blank" rel="noreferrer">The ECMAScript® 2023 Language Specification</a> details everything about the JavaScript language, so anyone can implement their own JavaScript engine.</p><p>The following chapters need to be studied for our parser:</p><ul><li>Chapter 5: Notational Conventions</li><li>Chapter 11: ECMAScript Language: Source Text</li><li>Chapter 12: ECMAScript Language: Lexical Grammar</li><li>Chapter 13 - 16: Expressions, Statements, Functions, Classes, Scripts and Modules</li><li>Annex B: Additional ECMAScript Features for Web Browsers</li><li>Annex C: The Strict Mode of ECMAScript</li></ul><p>For navigation inside the specification:</p><ul><li>Anything clickable has a permanent link, they are shown on the URL as anchors, for example <code>#sec-identifiers</code></li><li>Hovering over things may show a tooltip, clicking on <code>References</code> shows all its references</li></ul><h2 id="notational-conventions" tabindex="-1">Notational Conventions <a class="header-anchor" href="#notational-conventions" aria-label="Permalink to &quot;Notational Conventions&quot;">​</a></h2><p><a href="https://tc39.es/ecma262/#sec-grammar-notation" target="_blank" rel="noreferrer">Chapter 5.1.5 Grammar Notation</a> is the section we need to read.</p><p>The things to note here are:</p><h3 id="recursion" tabindex="-1">Recursion <a class="header-anchor" href="#recursion" aria-label="Permalink to &quot;Recursion&quot;">​</a></h3><p>This is how lists are presented in the grammar.</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ArgumentList :</span></span>
 <span class="line"><span style="color:#e1e4e8;">  AssignmentExpression</span></span>
 <span class="line"><span style="color:#e1e4e8;">  ArgumentList , AssignmentExpression</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ArgumentList :</span></span>
 <span class="line"><span style="color:#24292e;">  AssignmentExpression</span></span>
diff --git a/assets/docs_learn_ecmascript_spec.md.03200411.lean.js b/assets/docs_learn_ecmascript_spec.md.c10ef8af.lean.js
similarity index 87%
rename from assets/docs_learn_ecmascript_spec.md.03200411.lean.js
rename to assets/docs_learn_ecmascript_spec.md.c10ef8af.lean.js
index 12b5400c52..1330e002a8 100644
--- a/assets/docs_learn_ecmascript_spec.md.03200411.lean.js
+++ b/assets/docs_learn_ecmascript_spec.md.c10ef8af.lean.js
@@ -1 +1 @@
-import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Specification","description":"","frontmatter":{"title":"Specification","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecmascript/spec.md","filePath":"docs/learn/ecmascript/spec.md","lastUpdated":1701052174000}'),l={name:"docs/learn/ecmascript/spec.md"},o=e("",39),p=[o];function t(r,c,i,y,E,d){return a(),n("div",null,p)}const m=s(l,[["render",t]]);export{u as __pageData,m as default};
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Specification","description":"","frontmatter":{"title":"Specification","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecmascript/spec.md","filePath":"docs/learn/ecmascript/spec.md","lastUpdated":1701053760000}'),l={name:"docs/learn/ecmascript/spec.md"},o=e("",39),p=[o];function t(r,c,i,y,E,d){return a(),n("div",null,p)}const m=s(l,[["render",t]]);export{u as __pageData,m as default};
diff --git a/assets/docs_learn_ecosystem.md.8c414ce3.js b/assets/docs_learn_ecosystem.md.81955525.js
similarity index 96%
rename from assets/docs_learn_ecosystem.md.8c414ce3.js
rename to assets/docs_learn_ecosystem.md.81955525.js
index b449bfd78b..d9538f9114 100644
--- a/assets/docs_learn_ecosystem.md.8c414ce3.js
+++ b/assets/docs_learn_ecosystem.md.81955525.js
@@ -1 +1 @@
-import{_ as e,o as t,c as a,Q as r}from"./chunks/framework.725e5b03.js";const _=JSON.parse('{"title":"Ecosystem","description":"","frontmatter":{"title":"Ecosystem","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecosystem.md","filePath":"docs/learn/ecosystem.md","lastUpdated":1701052174000}'),o={name:"docs/learn/ecosystem.md"},n=r('<p>Contributing to oxc will benefit the whole frontend development community. It would be a great pleasure if you could join as well.</p><p>We are being integrated into:</p><h2 id="rspack" tabindex="-1"><a href="https://www.rspack.dev" target="_blank" rel="noreferrer">Rspack</a> <a class="header-anchor" href="#rspack" aria-label="Permalink to &quot;[Rspack](https://www.rspack.dev)&quot;">​</a></h2><p>A fast Rust-based web bundler.</p><h2 id="rolldown" tabindex="-1">Rolldown <a class="header-anchor" href="#rolldown" aria-label="Permalink to &quot;Rolldown&quot;">​</a></h2><p>To be announced.</p><h2 id="ezno-type-checker" tabindex="-1"><a href="https://github.com/kaleidawave/ezno" target="_blank" rel="noreferrer">Ezno Type Checker</a> <a class="header-anchor" href="#ezno-type-checker" aria-label="Permalink to &quot;[Ezno Type Checker](https://github.com/kaleidawave/ezno)&quot;">​</a></h2><p>A JavaScript compiler and TypeScript checker written in Rust with a focus on static analysis and runtime performance.</p><h2 id="tyvm" tabindex="-1"><a href="https://github.com/zackradisic/tyvm" target="_blank" rel="noreferrer">Tyvm</a> <a class="header-anchor" href="#tyvm" aria-label="Permalink to &quot;[Tyvm](https://github.com/zackradisic/tyvm)&quot;">​</a></h2><p>An experimental bytecode interpreter for type-level Typescript.</p>',10),c=[n];function s(i,l,p,d,h,m){return t(),a("div",null,c)}const f=e(o,[["render",s]]);export{_ as __pageData,f as default};
+import{_ as e,o as t,c as a,Q as r}from"./chunks/framework.725e5b03.js";const _=JSON.parse('{"title":"Ecosystem","description":"","frontmatter":{"title":"Ecosystem","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecosystem.md","filePath":"docs/learn/ecosystem.md","lastUpdated":1701053760000}'),o={name:"docs/learn/ecosystem.md"},n=r('<p>Contributing to oxc will benefit the whole frontend development community. It would be a great pleasure if you could join as well.</p><p>We are being integrated into:</p><h2 id="rspack" tabindex="-1"><a href="https://www.rspack.dev" target="_blank" rel="noreferrer">Rspack</a> <a class="header-anchor" href="#rspack" aria-label="Permalink to &quot;[Rspack](https://www.rspack.dev)&quot;">​</a></h2><p>A fast Rust-based web bundler.</p><h2 id="rolldown" tabindex="-1">Rolldown <a class="header-anchor" href="#rolldown" aria-label="Permalink to &quot;Rolldown&quot;">​</a></h2><p>To be announced.</p><h2 id="ezno-type-checker" tabindex="-1"><a href="https://github.com/kaleidawave/ezno" target="_blank" rel="noreferrer">Ezno Type Checker</a> <a class="header-anchor" href="#ezno-type-checker" aria-label="Permalink to &quot;[Ezno Type Checker](https://github.com/kaleidawave/ezno)&quot;">​</a></h2><p>A JavaScript compiler and TypeScript checker written in Rust with a focus on static analysis and runtime performance.</p><h2 id="tyvm" tabindex="-1"><a href="https://github.com/zackradisic/tyvm" target="_blank" rel="noreferrer">Tyvm</a> <a class="header-anchor" href="#tyvm" aria-label="Permalink to &quot;[Tyvm](https://github.com/zackradisic/tyvm)&quot;">​</a></h2><p>An experimental bytecode interpreter for type-level Typescript.</p>',10),c=[n];function s(i,l,p,d,h,m){return t(),a("div",null,c)}const f=e(o,[["render",s]]);export{_ as __pageData,f as default};
diff --git a/assets/docs_learn_ecosystem.md.8c414ce3.lean.js b/assets/docs_learn_ecosystem.md.81955525.lean.js
similarity index 86%
rename from assets/docs_learn_ecosystem.md.8c414ce3.lean.js
rename to assets/docs_learn_ecosystem.md.81955525.lean.js
index 16f96e2cbc..99f6d221a5 100644
--- a/assets/docs_learn_ecosystem.md.8c414ce3.lean.js
+++ b/assets/docs_learn_ecosystem.md.81955525.lean.js
@@ -1 +1 @@
-import{_ as e,o as t,c as a,Q as r}from"./chunks/framework.725e5b03.js";const _=JSON.parse('{"title":"Ecosystem","description":"","frontmatter":{"title":"Ecosystem","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecosystem.md","filePath":"docs/learn/ecosystem.md","lastUpdated":1701052174000}'),o={name:"docs/learn/ecosystem.md"},n=r("",10),c=[n];function s(i,l,p,d,h,m){return t(),a("div",null,c)}const f=e(o,[["render",s]]);export{_ as __pageData,f as default};
+import{_ as e,o as t,c as a,Q as r}from"./chunks/framework.725e5b03.js";const _=JSON.parse('{"title":"Ecosystem","description":"","frontmatter":{"title":"Ecosystem","outline":"deep"},"headers":[],"relativePath":"docs/learn/ecosystem.md","filePath":"docs/learn/ecosystem.md","lastUpdated":1701053760000}'),o={name:"docs/learn/ecosystem.md"},n=r("",10),c=[n];function s(i,l,p,d,h,m){return t(),a("div",null,c)}const f=e(o,[["render",s]]);export{_ as __pageData,f as default};
diff --git a/assets/docs_learn_performance.md.5eb36f6e.js b/assets/docs_learn_performance.md.33aec0bd.js
similarity index 99%
rename from assets/docs_learn_performance.md.5eb36f6e.js
rename to assets/docs_learn_performance.md.33aec0bd.js
index 233c47ff33..e612b58778 100644
--- a/assets/docs_learn_performance.md.5eb36f6e.js
+++ b/assets/docs_learn_performance.md.33aec0bd.js
@@ -1,4 +1,4 @@
-import{_ as s,o as a,c as n,Q as l}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"docs/learn/performance.md","filePath":"docs/learn/performance.md","lastUpdated":1701052174000}'),p={name:"docs/learn/performance.md"},o=l(`<h1 id="pursuit-of-performance-on-building-a-javascript-compiler" tabindex="-1">Pursuit of Performance on Building a JavaScript Compiler <a class="header-anchor" href="#pursuit-of-performance-on-building-a-javascript-compiler" aria-label="Permalink to &quot;Pursuit of Performance on Building a JavaScript Compiler&quot;">​</a></h1><p>Originally posted on <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">https://rustmagazine.org/issue-3/javascript-compiler/</a></p><h2 id="on-performance" tabindex="-1">On Performance <a class="header-anchor" href="#on-performance" aria-label="Permalink to &quot;On Performance&quot;">​</a></h2><p>After two years of writing Rust, performance has become an ingrained discipline for me - it boils down to <strong>allocate less memory</strong> and <strong>use fewer CPU cycles</strong>.</p><p>However, achieving optimal performance can be difficult without the knowledge of the problem domain or awareness of potential solutions.</p><p>I will take you on my journey of performance and optimization in the following sections. My preferred method of learning is through a combination of research, trial, and error, so the following sections will be organized as such.</p><h1 id="parsing" tabindex="-1">Parsing <a class="header-anchor" href="#parsing" aria-label="Permalink to &quot;Parsing&quot;">​</a></h1><p>Oxc is a standard compiler that includes an abstract syntax tree (AST), a lexer, and a recursive descent parser.</p><h2 id="abstract-syntax-tree-ast" tabindex="-1">Abstract Syntax Tree (AST) <a class="header-anchor" href="#abstract-syntax-tree-ast" aria-label="Permalink to &quot;Abstract Syntax Tree (AST)&quot;">​</a></h2><p>The first architectural design for a compiler is its AST.</p><p>All JavaScript tools work on the AST level, for example:</p><ul><li>A linter (e.g. ESLint) checks the AST for errors</li><li>A formatter (e.g.prettier) prints the AST back to JavaScript text</li><li>A minifier (e.g. terser) transforms the AST</li><li>A bundler connects all import and export statements between ASTs from different files</li></ul><p>It will be painful to build these tools if the AST is not user-friendly.</p><p>For JavaScript, the most used AST specification is <a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a>. My first AST version replicates estree:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Program</span><span style="color:#E1E4E8;"> {</span></span>
+import{_ as s,o as a,c as n,Q as l}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"docs/learn/performance.md","filePath":"docs/learn/performance.md","lastUpdated":1701053760000}'),p={name:"docs/learn/performance.md"},o=l(`<h1 id="pursuit-of-performance-on-building-a-javascript-compiler" tabindex="-1">Pursuit of Performance on Building a JavaScript Compiler <a class="header-anchor" href="#pursuit-of-performance-on-building-a-javascript-compiler" aria-label="Permalink to &quot;Pursuit of Performance on Building a JavaScript Compiler&quot;">​</a></h1><p>Originally posted on <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">https://rustmagazine.org/issue-3/javascript-compiler/</a></p><h2 id="on-performance" tabindex="-1">On Performance <a class="header-anchor" href="#on-performance" aria-label="Permalink to &quot;On Performance&quot;">​</a></h2><p>After two years of writing Rust, performance has become an ingrained discipline for me - it boils down to <strong>allocate less memory</strong> and <strong>use fewer CPU cycles</strong>.</p><p>However, achieving optimal performance can be difficult without the knowledge of the problem domain or awareness of potential solutions.</p><p>I will take you on my journey of performance and optimization in the following sections. My preferred method of learning is through a combination of research, trial, and error, so the following sections will be organized as such.</p><h1 id="parsing" tabindex="-1">Parsing <a class="header-anchor" href="#parsing" aria-label="Permalink to &quot;Parsing&quot;">​</a></h1><p>Oxc is a standard compiler that includes an abstract syntax tree (AST), a lexer, and a recursive descent parser.</p><h2 id="abstract-syntax-tree-ast" tabindex="-1">Abstract Syntax Tree (AST) <a class="header-anchor" href="#abstract-syntax-tree-ast" aria-label="Permalink to &quot;Abstract Syntax Tree (AST)&quot;">​</a></h2><p>The first architectural design for a compiler is its AST.</p><p>All JavaScript tools work on the AST level, for example:</p><ul><li>A linter (e.g. ESLint) checks the AST for errors</li><li>A formatter (e.g.prettier) prints the AST back to JavaScript text</li><li>A minifier (e.g. terser) transforms the AST</li><li>A bundler connects all import and export statements between ASTs from different files</li></ul><p>It will be painful to build these tools if the AST is not user-friendly.</p><p>For JavaScript, the most used AST specification is <a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a>. My first AST version replicates estree:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Program</span><span style="color:#E1E4E8;"> {</span></span>
 <span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
 <span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> body</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&gt;,</span></span>
 <span class="line"><span style="color:#E1E4E8;">}</span></span>
diff --git a/assets/docs_learn_performance.md.5eb36f6e.lean.js b/assets/docs_learn_performance.md.33aec0bd.lean.js
similarity index 86%
rename from assets/docs_learn_performance.md.5eb36f6e.lean.js
rename to assets/docs_learn_performance.md.33aec0bd.lean.js
index bec2958b41..90782fdee8 100644
--- a/assets/docs_learn_performance.md.5eb36f6e.lean.js
+++ b/assets/docs_learn_performance.md.33aec0bd.lean.js
@@ -1 +1 @@
-import{_ as s,o as a,c as n,Q as l}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"docs/learn/performance.md","filePath":"docs/learn/performance.md","lastUpdated":1701052174000}'),p={name:"docs/learn/performance.md"},o=l("",166),e=[o];function t(r,c,y,E,i,d){return a(),n("div",null,e)}const F=s(p,[["render",t]]);export{h as __pageData,F as default};
+import{_ as s,o as a,c as n,Q as l}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"docs/learn/performance.md","filePath":"docs/learn/performance.md","lastUpdated":1701053760000}'),p={name:"docs/learn/performance.md"},o=l("",166),e=[o];function t(r,c,y,E,i,d){return a(),n("div",null,e)}const F=s(p,[["render",t]]);export{h as __pageData,F as default};
diff --git a/assets/docs_learn_references.md.ff70791a.js b/assets/docs_learn_references.md.62c70fb2.js
similarity index 98%
rename from assets/docs_learn_references.md.ff70791a.js
rename to assets/docs_learn_references.md.62c70fb2.js
index 2e5efe594a..51f8ec932d 100644
--- a/assets/docs_learn_references.md.ff70791a.js
+++ b/assets/docs_learn_references.md.62c70fb2.js
@@ -1 +1 @@
-import{_ as e,o as r,c as a,Q as t}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"References","description":"","frontmatter":{"title":"References","outline":"deep"},"headers":[],"relativePath":"docs/learn/references.md","filePath":"docs/learn/references.md","lastUpdated":1701052174000}'),l={name:"docs/learn/references.md"},i=t('<h1 id="references" tabindex="-1">References <a class="header-anchor" href="#references" aria-label="Permalink to &quot;References&quot;">​</a></h1><h2 id="projects-using-oxc" tabindex="-1">Projects Using Oxc <a class="header-anchor" href="#projects-using-oxc" aria-label="Permalink to &quot;Projects Using Oxc&quot;">​</a></h2><h2 id="📚-learning-resources" tabindex="-1">📚 Learning Resources <a class="header-anchor" href="#📚-learning-resources" aria-label="Permalink to &quot;📚 Learning Resources&quot;">​</a></h2><ul><li>My small tutorial on <a href="https://oxc-project.github.io/javascript-parser-in-rust" target="_blank" rel="noreferrer">how to write a JavaScript Parser in Rust</a></li><li>My small article <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">Pursuit of Performance on Building a JavaScript Compiler</a></li><li><a href="https://craftinginterpreters.com" target="_blank" rel="noreferrer">Crafting Interpreters</a></li><li><a href="https://vimeo.com/649009599" target="_blank" rel="noreferrer">Andrew Kelley - Practical DOD</a></li></ul><h2 id="parsers-in-active-development" tabindex="-1">Parsers (in active development) <a class="header-anchor" href="#parsers-in-active-development" aria-label="Permalink to &quot;Parsers (in active development)&quot;">​</a></h2><ul><li>Rust <ul><li><a href="https://swc.rs" target="_blank" rel="noreferrer">swc</a></li><li><a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a></li><li><a href="https://github.com/ratel-rust/ratel-core" target="_blank" rel="noreferrer">ratel</a></li><li><a href="https://github.com/lastmjs/boa-azle" target="_blank" rel="noreferrer">boa</a></li></ul></li><li>JavaScript <ul><li><a href="https://github.com/acornjs/acorn" target="_blank" rel="noreferrer">acorn</a></li><li><a href="https://babeljs.io" target="_blank" rel="noreferrer">babel</a></li></ul></li><li>Go <ul><li><a href="https://esbuild.github.io" target="_blank" rel="noreferrer">esbuild</a></li></ul></li><li>C++ <ul><li><a href="https://github.com/quick-lint/quick-lint-js" target="_blank" rel="noreferrer">quick-lint-js</a></li></ul></li></ul><h2 id="ast" tabindex="-1">AST <a class="header-anchor" href="#ast" aria-label="Permalink to &quot;AST&quot;">​</a></h2><ul><li><a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a></li><li><a href="https://github.com/swc-project/swc/tree/main/crates/swc_ecma_ast/src" target="_blank" rel="noreferrer">swc_ecma_ast</a></li><li><a href="https://github.com/babel/babel/blob/main/packages/babel-types/src/ast-types/generated/index.ts" target="_blank" rel="noreferrer">babel ast</a></li><li><a href="https://gist.github.com/Boshen/0b481a058cd715576aaf1624d2c6d469" target="_blank" rel="noreferrer">jsparagus</a></li></ul><h2 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h2><ul><li><a href="https://nnethercote.github.io/perf-book/introduction.html" target="_blank" rel="noreferrer">The Rust Performance Book</a></li></ul><h2 id="blog-posts" tabindex="-1">Blog Posts <a class="header-anchor" href="#blog-posts" aria-label="Permalink to &quot;Blog Posts&quot;">​</a></h2><ul><li><a href="https://v8.dev/blog/scanner" target="_blank" rel="noreferrer">Blazingly fast parsing, part 1: optimizing the scanner</a></li><li><a href="https://v8.dev/blog/preparser" target="_blank" rel="noreferrer">Blazingly fast parsing, part 2: lazy parsing</a></li><li><a href="https://v8.dev/blog/tags/understanding-ecmascript" target="_blank" rel="noreferrer">Understanding ECMAScript</a></li><li><a href="https://matklad.github.io/2020/04/13/simple-but-powerful-pratt-parsing.html" target="_blank" rel="noreferrer">Simple but Powerful Pratt Parsing</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">JS syntactic quirks</a></li></ul>',12),s=[i];function n(o,c,h,u,p,f){return r(),a("div",null,s)}const d=e(l,[["render",n]]);export{g as __pageData,d as default};
+import{_ as e,o as r,c as a,Q as t}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"References","description":"","frontmatter":{"title":"References","outline":"deep"},"headers":[],"relativePath":"docs/learn/references.md","filePath":"docs/learn/references.md","lastUpdated":1701053760000}'),l={name:"docs/learn/references.md"},i=t('<h1 id="references" tabindex="-1">References <a class="header-anchor" href="#references" aria-label="Permalink to &quot;References&quot;">​</a></h1><h2 id="projects-using-oxc" tabindex="-1">Projects Using Oxc <a class="header-anchor" href="#projects-using-oxc" aria-label="Permalink to &quot;Projects Using Oxc&quot;">​</a></h2><h2 id="📚-learning-resources" tabindex="-1">📚 Learning Resources <a class="header-anchor" href="#📚-learning-resources" aria-label="Permalink to &quot;📚 Learning Resources&quot;">​</a></h2><ul><li>My small tutorial on <a href="https://oxc-project.github.io/javascript-parser-in-rust" target="_blank" rel="noreferrer">how to write a JavaScript Parser in Rust</a></li><li>My small article <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">Pursuit of Performance on Building a JavaScript Compiler</a></li><li><a href="https://craftinginterpreters.com" target="_blank" rel="noreferrer">Crafting Interpreters</a></li><li><a href="https://vimeo.com/649009599" target="_blank" rel="noreferrer">Andrew Kelley - Practical DOD</a></li></ul><h2 id="parsers-in-active-development" tabindex="-1">Parsers (in active development) <a class="header-anchor" href="#parsers-in-active-development" aria-label="Permalink to &quot;Parsers (in active development)&quot;">​</a></h2><ul><li>Rust <ul><li><a href="https://swc.rs" target="_blank" rel="noreferrer">swc</a></li><li><a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a></li><li><a href="https://github.com/ratel-rust/ratel-core" target="_blank" rel="noreferrer">ratel</a></li><li><a href="https://github.com/lastmjs/boa-azle" target="_blank" rel="noreferrer">boa</a></li></ul></li><li>JavaScript <ul><li><a href="https://github.com/acornjs/acorn" target="_blank" rel="noreferrer">acorn</a></li><li><a href="https://babeljs.io" target="_blank" rel="noreferrer">babel</a></li></ul></li><li>Go <ul><li><a href="https://esbuild.github.io" target="_blank" rel="noreferrer">esbuild</a></li></ul></li><li>C++ <ul><li><a href="https://github.com/quick-lint/quick-lint-js" target="_blank" rel="noreferrer">quick-lint-js</a></li></ul></li></ul><h2 id="ast" tabindex="-1">AST <a class="header-anchor" href="#ast" aria-label="Permalink to &quot;AST&quot;">​</a></h2><ul><li><a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a></li><li><a href="https://github.com/swc-project/swc/tree/main/crates/swc_ecma_ast/src" target="_blank" rel="noreferrer">swc_ecma_ast</a></li><li><a href="https://github.com/babel/babel/blob/main/packages/babel-types/src/ast-types/generated/index.ts" target="_blank" rel="noreferrer">babel ast</a></li><li><a href="https://gist.github.com/Boshen/0b481a058cd715576aaf1624d2c6d469" target="_blank" rel="noreferrer">jsparagus</a></li></ul><h2 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h2><ul><li><a href="https://nnethercote.github.io/perf-book/introduction.html" target="_blank" rel="noreferrer">The Rust Performance Book</a></li></ul><h2 id="blog-posts" tabindex="-1">Blog Posts <a class="header-anchor" href="#blog-posts" aria-label="Permalink to &quot;Blog Posts&quot;">​</a></h2><ul><li><a href="https://v8.dev/blog/scanner" target="_blank" rel="noreferrer">Blazingly fast parsing, part 1: optimizing the scanner</a></li><li><a href="https://v8.dev/blog/preparser" target="_blank" rel="noreferrer">Blazingly fast parsing, part 2: lazy parsing</a></li><li><a href="https://v8.dev/blog/tags/understanding-ecmascript" target="_blank" rel="noreferrer">Understanding ECMAScript</a></li><li><a href="https://matklad.github.io/2020/04/13/simple-but-powerful-pratt-parsing.html" target="_blank" rel="noreferrer">Simple but Powerful Pratt Parsing</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">JS syntactic quirks</a></li></ul>',12),s=[i];function n(o,c,h,u,p,f){return r(),a("div",null,s)}const d=e(l,[["render",n]]);export{g as __pageData,d as default};
diff --git a/assets/docs_learn_references.md.ff70791a.lean.js b/assets/docs_learn_references.md.62c70fb2.lean.js
similarity index 86%
rename from assets/docs_learn_references.md.ff70791a.lean.js
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diff --git a/assets/ja_blog_index.md.3de8b9cb.js b/assets/ja_blog_index.md.3de8b9cb.js
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+import{_ as e,o as a,c as r,Q as s}from"./chunks/framework.725e5b03.js";const m=JSON.parse('{"title":"","description":"","frontmatter":{"outline":"deep"},"headers":[],"relativePath":"ja/blog/index.md","filePath":"ja/blog/index.md","lastUpdated":1701053760000}'),t={name:"ja/blog/index.md"},o=s(`<p><a href="https://github.com/rome/tools" target="_blank" rel="noreferrer">Rome</a> uses a different set of techniques for parsing JavaScript and TypeScript. This tutorial summarizes them in learning order for better understanding.</p><h2 id="history" tabindex="-1">History <a class="header-anchor" href="#history" aria-label="Permalink to &quot;History&quot;">​</a></h2><ul><li>The Rome codebase was rewritten from TypeScript to Rust, see <a href="https://rome.tools/blog/2021/09/21/rome-will-be-rewritten-in-rust" target="_blank" rel="noreferrer">Rome will be rewritten in Rust</a></li><li>The decision was made after talking to the author of <a href="https://github.com/rslint/rslint" target="_blank" rel="noreferrer">rslint</a> and <a href="https://github.com/rust-lang/rust-analyzer" target="_blank" rel="noreferrer">rust-analyzer</a></li><li>rust-analyzer proved that IDE-centric tools built around concrete syntax tree are possible</li><li>rslint proved that it is possible to write a JavaScript parser in Rust, with the same base libraries as rust-analyzer</li><li>Rome ported the rslint codebase to their own repo with permission from rslint&#39;s author</li></ul><h2 id="concrete-syntax-tree" tabindex="-1">Concrete Syntax Tree <a class="header-anchor" href="#concrete-syntax-tree" aria-label="Permalink to &quot;Concrete Syntax Tree&quot;">​</a></h2><ul><li>The base library is called <a href="https://github.com/rust-analyzer/rowan" target="_blank" rel="noreferrer">rowan</a>, see <a href="https://github.com/rust-lang/rust-analyzer/blob/master/docs/dev/syntax.md" target="_blank" rel="noreferrer">overview of rowan</a></li><li>Rowan, also known as red-green trees, is named after the real green <a href="https://en.wikipedia.org/wiki/Rowan" target="_blank" rel="noreferrer">rowan tree</a> that makes red berries</li><li>The origin of red-green trees is described in this <a href="https://ericlippert.com/2012/06/08/red-green-trees/" target="_blank" rel="noreferrer">blog post</a>, by the authors of the C# programming language</li><li>The whole point of rowan is to define a lossless concrete syntax tree (CST) that describes all the details of the source code and provides a set of traversal APIs (parent, children, siblings, etc)</li><li>Read the advantage of having a CST over an AST: <a href="https://rdambrosio016.github.io/rust/2020/09/18/pure-ast-based-linting-sucks.html" target="_blank" rel="noreferrer">Pure AST based linting sucks</a></li><li>CST provides the ability to build a fully recoverable parser</li></ul><h2 id="grammar" tabindex="-1">Grammar <a class="header-anchor" href="#grammar" aria-label="Permalink to &quot;Grammar&quot;">​</a></h2><ul><li>Just like an AST, we need to define the grammar. The grammar is auto-generated by using <a href="https://github.com/rome/tools/tree/main/xtask/codegen" target="_blank" rel="noreferrer">xtask/codegen</a></li><li>The grammar is generated from the <a href="https://github.com/rust-analyzer/ungrammar" target="_blank" rel="noreferrer">ungrammar</a> DSL</li><li>The input <code>ungrammar</code> source file is in <a href="https://github.com/rome/tools/blob/main/xtask/codegen/js.ungram" target="_blank" rel="noreferrer">xtask/codegen/js.ungram</a></li><li>The output of the codegen is in <a href="https://github.com/rome/tools/tree/main/crates/rome_js_syntax/src/generated" target="_blank" rel="noreferrer">rome_js_syntax/src/generated</a></li></ul><h2 id="entry-point" tabindex="-1">Entry Point <a class="header-anchor" href="#entry-point" aria-label="Permalink to &quot;Entry Point&quot;">​</a></h2><p>The Rome codebase is getting large and slightly difficult to find the parser entry point.</p><p>For first-time contributors, the <code>rome_cli</code> crate is the binary entry point for running the code:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#B392F0;">touch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">test.js</span></span>
+<span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">check</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">./test.js</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">rome_cli</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6F42C1;">touch</span><span style="color:#24292E;"> </span><span style="color:#032F62;">test.js</span></span>
+<span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">rome_cli</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--</span><span style="color:#24292E;"> </span><span style="color:#032F62;">check</span><span style="color:#24292E;"> </span><span style="color:#032F62;">./test.js</span></span></code></pre></div><p><code>rome_cli</code> will eventually call <code>rome_js_parser::parse</code></p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/parse.rs#L178-L187</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/parse.rs#L178-L187</span></span></code></pre></div><p>and finally the actual parsing code</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/syntax/program.rs#L14-L17</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/syntax/program.rs#L14-L17</span></span></code></pre></div><h2 id="contributing" tabindex="-1">Contributing <a class="header-anchor" href="#contributing" aria-label="Permalink to &quot;Contributing&quot;">​</a></h2><ul><li><a href="https://github.com/rome/tools/blob/main/CONTRIBUTING.md" target="_blank" rel="noreferrer">CONTRIBUTING.md</a> has instructions on how to contribute</li><li><a href="https://rome.github.io/tools/rome_js_parser/index.html" target="_blank" rel="noreferrer">rome_js_parser crate doc</a> has some more details on the parser</li><li>See <a href="https://github.com/rome/tools/tree/main/xtask/codegen#cargo-codegen-test" target="_blank" rel="noreferrer"><code>cargo codegen test</code></a> for working with parser tests</li><li>See <a href="https://github.com/rome/tools/tree/main/xtask/coverage" target="_blank" rel="noreferrer"><code>cargo coverage</code></a> for working with conformance tests</li><li>Join the <a href="https://discord.com/invite/rome" target="_blank" rel="noreferrer">Discord Server</a> for inquiries</li></ul><div class="info custom-block"><p class="custom-block-title">INFO</p><p>The JavaScript / TypeScript parser is 99% complete, the best way to help is to test Rome in your own codebases or take a look at the <a href="https://github.com/rome/tools/issues" target="_blank" rel="noreferrer">issues on Github</a>.</p></div>`,18),n=[o];function l(i,p,c,h,d,b){return a(),r("div",null,n)}const u=e(t,[["render",l]]);export{m as __pageData,u as default};
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new file mode 100644
index 0000000000..efb30fbfbd
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+import{_ as t,o,c as a,k as e,a as n}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Codegen","description":"","frontmatter":{"title":"Codegen","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/codegen.md","filePath":"ja/docs/contribute/codegen.md","lastUpdated":1701053760000}'),c={name:"ja/docs/contribute/codegen.md"},d=e("h1",{id:"codegen",tabindex:"-1"},[n("Codegen "),e("a",{class:"header-anchor",href:"#codegen","aria-label":'Permalink to "Codegen"'},"​")],-1),s=[d];function r(i,l,_,p,g,h){return o(),a("div",null,s)}const u=t(c,[["render",r]]);export{f as __pageData,u as default};
diff --git a/assets/ja_docs_contribute_codegen.md.837767d8.lean.js b/assets/ja_docs_contribute_codegen.md.837767d8.lean.js
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+import{_ as t,o,c as a,k as e,a as n}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Codegen","description":"","frontmatter":{"title":"Codegen","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/codegen.md","filePath":"ja/docs/contribute/codegen.md","lastUpdated":1701053760000}'),c={name:"ja/docs/contribute/codegen.md"},d=e("h1",{id:"codegen",tabindex:"-1"},[n("Codegen "),e("a",{class:"header-anchor",href:"#codegen","aria-label":'Permalink to "Codegen"'},"​")],-1),s=[d];function r(i,l,_,p,g,h){return o(),a("div",null,s)}const u=t(c,[["render",r]]);export{f as __pageData,u as default};
diff --git a/assets/ja_docs_contribute_development.md.599cc7ae.js b/assets/ja_docs_contribute_development.md.599cc7ae.js
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+import{_ as s,o as e,c as a,Q as o}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Development","description":"","frontmatter":{"title":"Development","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/development.md","filePath":"ja/docs/contribute/development.md","lastUpdated":1701053760000}'),t={name:"ja/docs/contribute/development.md"},l=o('<h1 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h1><p>This page explains how to set up enrionment for OXC development.</p><h2 id="clone-repository" tabindex="-1">Clone Repository <a class="header-anchor" href="#clone-repository" aria-label="Permalink to &quot;Clone Repository&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">git</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">clone</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--recurse-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--shallow-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">git@github.com:oxc-project/oxc.git</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">git</span><span style="color:#24292E;"> </span><span style="color:#032F62;">clone</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--recurse-submodules</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--shallow-submodules</span><span style="color:#24292E;"> </span><span style="color:#032F62;">git@github.com:oxc-project/oxc.git</span></span></code></pre></div><p>The <code>--recurse-submodules</code> and <code>--shallow-submodules</code> flags are needed to initialize git submodules that are needed to run conformance tests.</p><h2 id="set-up-project" tabindex="-1">Set Up Project <a class="header-anchor" href="#set-up-project" aria-label="Permalink to &quot;Set Up Project&quot;">​</a></h2><h3 id="install-rust" tabindex="-1">Install Rust <a class="header-anchor" href="#install-rust" aria-label="Permalink to &quot;Install Rust&quot;">​</a></h3><p>If you have not yet installed Rust, follow <a href="https://www.rust-lang.org/tools/install" target="_blank" rel="noreferrer">the official instruction</a> and install Rust.</p><p>After installing Rust, run the following command at the project root:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">rustup</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">show</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">rustup</span><span style="color:#24292E;"> </span><span style="color:#032F62;">show</span></span></code></pre></div><p><code>rustup show</code> reads the <code>./rust-toolchain.toml</code> file and installs the correct Rust toolchain and components for this project.</p><h3 id="install-project-tools" tabindex="-1">Install Project Tools <a class="header-anchor" href="#install-project-tools" aria-label="Permalink to &quot;Install Project Tools&quot;">​</a></h3><h4 id="cargo-binstall" tabindex="-1"><code>cargo-binstall</code> <a class="header-anchor" href="#cargo-binstall" aria-label="Permalink to &quot;`cargo-binstall`&quot;">​</a></h4><p>Some Cargo tools are required to develop OXC, and it is recommended to use <a href="https://github.com/cargo-bins/cargo-binstall" target="_blank" rel="noreferrer">cargo binstall</a>, which provides a low-complexity mechanism to install rust binaries and is fater way than building them from source by running <code>cargo install</code>.</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo-binstall</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo-binstall</span></span></code></pre></div><p>You can also download <a href="https://github.com/cargo-bins/cargo-binstall#installation" target="_blank" rel="noreferrer">the pre-compiled binary</a> and save it in <code>~/.cargo/bin</code>.</p><h4 id="just" tabindex="-1"><code>just</code> <a class="header-anchor" href="#just" aria-label="Permalink to &quot;`just`&quot;">​</a></h4><p>OXC utilizes <a href="https://github.com/casey/just" target="_blank" rel="noreferrer"><code>just</code></a>, which is a handy way to save and run project-specific commands:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">binstall</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-y</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">binstall</span><span style="color:#24292E;"> </span><span style="color:#032F62;">just</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-y</span></span></code></pre></div><h4 id="dependencies" tabindex="-1">Dependencies <a class="header-anchor" href="#dependencies" aria-label="Permalink to &quot;Dependencies&quot;">​</a></h4><p>Run the following command in <code>justfile</code> at the project root to install dependencies:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">init</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">init</span></span></code></pre></div><p>You can see the list of available commands by running <code>just</code>.</p><p>You can run <code>just ready</code> (or, <code>just r</code> in short) to make sure the whole project builds and runs correctly.</p><hr><p>Now you are ready to develop OXC! You can check out <a href="https://github.com/oxc-project/oxc/contribute" target="_blank" rel="noreferrer">good first issues</a> or ask us on <a href="https://discord.gg/9uXCAwqQZW" target="_blank" rel="noreferrer">Discord</a>.</p>',26),n=[l];function r(c,p,i,d,h,u){return e(),a("div",null,n)}const y=s(t,[["render",r]]);export{g as __pageData,y as default};
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+import{_ as t,o as a,c as r,k as e,a as o}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Formatter","description":"","frontmatter":{"title":"Formatter","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/formatter.md","filePath":"ja/docs/contribute/formatter.md","lastUpdated":1701053760000}'),i={name:"ja/docs/contribute/formatter.md"},n=e("h1",{id:"formatter",tabindex:"-1"},[o("Formatter "),e("a",{class:"header-anchor",href:"#formatter","aria-label":'Permalink to "Formatter"'},"​")],-1),s=e("p",null,"While [prettier] has established itself as the de facto code formatter for JavaScript, there is a significant demand in the developer community for a less opinionated alternative. Recognizing this need, our ambition is to undertake research and development to create a new JavaScript formatter that offers increased flexibility and customization options. Unfortunately we are currently lacking the resources to do so.",-1),c=[n,s];function d(l,m,f,h,p,u){return a(),r("div",null,c)}const v=t(i,[["render",d]]);export{b as __pageData,v as default};
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+import{_ as t,o as a,c as r,k as e,a as o}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Formatter","description":"","frontmatter":{"title":"Formatter","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/formatter.md","filePath":"ja/docs/contribute/formatter.md","lastUpdated":1701053760000}'),i={name:"ja/docs/contribute/formatter.md"},n=e("h1",{id:"formatter",tabindex:"-1"},[o("Formatter "),e("a",{class:"header-anchor",href:"#formatter","aria-label":'Permalink to "Formatter"'},"​")],-1),s=e("p",null,"While [prettier] has established itself as the de facto code formatter for JavaScript, there is a significant demand in the developer community for a less opinionated alternative. Recognizing this need, our ambition is to undertake research and development to create a new JavaScript formatter that offers increased flexibility and customization options. Unfortunately we are currently lacking the resources to do so.",-1),c=[n,s];function d(l,m,f,h,p,u){return a(),r("div",null,c)}const v=t(i,[["render",d]]);export{b as __pageData,v as default};
diff --git a/assets/ja_docs_contribute_introduction.md.cb17b786.js b/assets/ja_docs_contribute_introduction.md.cb17b786.js
new file mode 100644
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+import{_ as e,o as t,c as a,Q as o}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/introduction.md","filePath":"ja/docs/contribute/introduction.md","lastUpdated":1701053760000}'),i={name:"ja/docs/contribute/introduction.md"},n=o('<h1 id="introduction" tabindex="-1">Introduction <a class="header-anchor" href="#introduction" aria-label="Permalink to &quot;Introduction&quot;">​</a></h1><p>Thank you for getting interested in contributing to OXC project! Before starting, please make sure to read the following rules and policy.</p><h2 id="general-rules" tabindex="-1">General Rules <a class="header-anchor" href="#general-rules" aria-label="Permalink to &quot;General Rules&quot;">​</a></h2><ul><li>We welcome and appreciate any form of contributions.</li><li>Please create an issue or discussion if you want to make an architectural change.</li></ul><h2 id="pr-rules" tabindex="-1">PR Rules <a class="header-anchor" href="#pr-rules" aria-label="Permalink to &quot;PR Rules&quot;">​</a></h2><ul><li>We <a href="https://graphite.dev/blog/how-large-prs-slow-down-development" target="_blank" rel="noreferrer">prefer smaller PRs</a> for faster development.</li><li>Try stacked PRs with <a href="https://graphite.dev" target="_blank" rel="noreferrer">graphite</a> if you are given access permission to the repository.</li></ul><h2 id="action-policy" tabindex="-1">Action Policy <a class="header-anchor" href="#action-policy" aria-label="Permalink to &quot;Action Policy&quot;">​</a></h2><p>Taken from <a href="https://astral-sh.notion.site/Astral-s-Values-0ed6a642bcc84e91af6836b2373572f5" target="_blank" rel="noreferrer">Astral&#39;s values</a>:</p><blockquote><p>We bias towards action, even in the face of uncertainty. We favor <em>pragmatic doing</em> over <strong>prolonged debating</strong>; we favor asking for <em>forgiveness</em> over <em>permission</em>. We value <strong>decisiveness — especially</strong> when a decision isn’t clear cut, and <strong>especially</strong> when a decision is reversible.</p><p>A bias towards action is <em>not</em> the same as recklessness. Rather, it’s a bias towards making <em>responsible</em> decisions and acting on them with <em>urgency</em>, even if we’re left with lingering ambiguity or known unknowns.</p></blockquote><h2 id="development-policy" tabindex="-1">Development Policy <a class="header-anchor" href="#development-policy" aria-label="Permalink to &quot;Development Policy&quot;">​</a></h2><ul><li>All performance issues (runtime and compilation speed) are considered as bugs in this project.</li><li>Embrace data-oriented design.</li><li>APIs should be simple and well-documented.</li><li>Third-party dependencies should be minimal.</li><li>Avoid the <code>regex</code> crate when possible. Regexes are slow, most of them can be rewritten in a performant way by using Rust iterator and string methods.</li><li>Avoid macros, traits or any Rust techniques that would penalize compilation speed.</li></ul><h2 id="maintenance-policy" tabindex="-1">Maintenance Policy <a class="header-anchor" href="#maintenance-policy" aria-label="Permalink to &quot;Maintenance Policy&quot;">​</a></h2><ul><li>Monitor code coverage for unused code. Aim for 99% code coverage.</li><li>CI time should be actively monitored and reduced to speed up merging of PRs. The current CI time on GitHub actions is around 3 minutes.</li></ul>',13),r=[n];function s(l,c,d,u,h,p){return t(),a("div",null,r)}const g=e(i,[["render",s]]);export{f as __pageData,g as default};
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+++ b/assets/ja_docs_contribute_linter.md.170c9f93.js
@@ -0,0 +1,9 @@
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/linter.md","filePath":"ja/docs/contribute/linter.md","lastUpdated":1701053760000}'),l={name:"ja/docs/contribute/linter.md"},o=e(`<h1 id="linter" tabindex="-1">Linter <a class="header-anchor" href="#linter" aria-label="Permalink to &quot;Linter&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Create a <code>./test.ts</code> and then</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">watch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">watch</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre></div><h2 id="rule-generation" tabindex="-1">Rule generation <a class="header-anchor" href="#rule-generation" aria-label="Permalink to &quot;Rule generation&quot;">​</a></h2><p>Create a new lint rule by providing the ESLint name</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span></code></pre></div><p>Then add the rule to <code>crates/oxc_linter/src/rules.rs</code>:</p><ol><li>Add to <code>mod</code></li><li>Add to <code>oxc_macros::declare_all_lint_rules</code> at the bottom of the file</li></ol><p>For other plugins, there are also:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-jest-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
+<span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-ts-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
+<span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-unicorn-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
+<span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-react-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
+<span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-jsx-a11y-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-jest-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
+<span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-ts-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
+<span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-unicorn-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
+<span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-react-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
+<span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-jsx-a11y-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span></code></pre></div>`,11),t=[o];function p(r,c,i,d,y,u){return a(),n("div",null,t)}const F=s(l,[["render",p]]);export{h as __pageData,F as default};
diff --git a/assets/ja_docs_contribute_linter.md.170c9f93.lean.js b/assets/ja_docs_contribute_linter.md.170c9f93.lean.js
new file mode 100644
index 0000000000..62c739fe19
--- /dev/null
+++ b/assets/ja_docs_contribute_linter.md.170c9f93.lean.js
@@ -0,0 +1 @@
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/linter.md","filePath":"ja/docs/contribute/linter.md","lastUpdated":1701053760000}'),l={name:"ja/docs/contribute/linter.md"},o=e("",11),t=[o];function p(r,c,i,d,y,u){return a(),n("div",null,t)}const F=s(l,[["render",p]]);export{h as __pageData,F as default};
diff --git a/assets/ja_docs_contribute_minifier.md.24e36ab1.js b/assets/ja_docs_contribute_minifier.md.24e36ab1.js
new file mode 100644
index 0000000000..885673933f
--- /dev/null
+++ b/assets/ja_docs_contribute_minifier.md.24e36ab1.js
@@ -0,0 +1 @@
+import{_ as i,o as t,c as o,k as e,a as s}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Minifier","description":"","frontmatter":{"title":"Minifier","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/minifier.md","filePath":"ja/docs/contribute/minifier.md","lastUpdated":1701053760000}'),a={name:"ja/docs/contribute/minifier.md"},r=e("h1",{id:"minifier",tabindex:"-1"},[s("Minifier "),e("a",{class:"header-anchor",href:"#minifier","aria-label":'Permalink to "Minifier"'},"​")],-1),n=e("p",null,"JavaScript minification plays a crucial role in optimizing website performance as it reduces the amount of data sent to users, resulting in faster page loads. This holds tremendous economic value, particularly for e-commerce websites, where every second can equate to millions of dollars.",-1),c=e("p",null,"However, existing minifiers typically require a trade-off between compression quality and speed. You have to choose between the slowest for the best compression or the fastest for less compression. But what if we could develop a faster minifier without compromising on compression?",-1),l=e("p",null,"We are actively working on a prototype that aims to achieve this goal, by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].",-1),d=e("p",null,"Preliminary results indicate that we are on track to achieve our objectives. With the Oxc minifier, you can expect faster minification times without sacrificing compression quality.",-1),f=[r,n,c,l,d];function m(p,u,h,_,w,b){return t(),o("div",null,f)}const v=i(a,[["render",m]]);export{g as __pageData,v as default};
diff --git a/assets/ja_docs_contribute_minifier.md.24e36ab1.lean.js b/assets/ja_docs_contribute_minifier.md.24e36ab1.lean.js
new file mode 100644
index 0000000000..885673933f
--- /dev/null
+++ b/assets/ja_docs_contribute_minifier.md.24e36ab1.lean.js
@@ -0,0 +1 @@
+import{_ as i,o as t,c as o,k as e,a as s}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Minifier","description":"","frontmatter":{"title":"Minifier","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/minifier.md","filePath":"ja/docs/contribute/minifier.md","lastUpdated":1701053760000}'),a={name:"ja/docs/contribute/minifier.md"},r=e("h1",{id:"minifier",tabindex:"-1"},[s("Minifier "),e("a",{class:"header-anchor",href:"#minifier","aria-label":'Permalink to "Minifier"'},"​")],-1),n=e("p",null,"JavaScript minification plays a crucial role in optimizing website performance as it reduces the amount of data sent to users, resulting in faster page loads. This holds tremendous economic value, particularly for e-commerce websites, where every second can equate to millions of dollars.",-1),c=e("p",null,"However, existing minifiers typically require a trade-off between compression quality and speed. You have to choose between the slowest for the best compression or the fastest for less compression. But what if we could develop a faster minifier without compromising on compression?",-1),l=e("p",null,"We are actively working on a prototype that aims to achieve this goal, by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].",-1),d=e("p",null,"Preliminary results indicate that we are on track to achieve our objectives. With the Oxc minifier, you can expect faster minification times without sacrificing compression quality.",-1),f=[r,n,c,l,d];function m(p,u,h,_,w,b){return t(),o("div",null,f)}const v=i(a,[["render",m]]);export{g as __pageData,v as default};
diff --git a/assets/ja_docs_contribute_parser.md.242f07ac.js b/assets/ja_docs_contribute_parser.md.242f07ac.js
new file mode 100644
index 0000000000..1752ddd9a3
--- /dev/null
+++ b/assets/ja_docs_contribute_parser.md.242f07ac.js
@@ -0,0 +1 @@
+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/parser.md","filePath":"ja/docs/contribute/parser.md","lastUpdated":1701053760000}'),s={name:"ja/docs/contribute/parser.md"},o=r('<h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>We aim to be the fastest Rust-based ready-for-production parser.</p><h2 id="conformance-tests" tabindex="-1">Conformance Tests <a class="header-anchor" href="#conformance-tests" aria-label="Permalink to &quot;Conformance Tests&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">c</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">c</span></span></code></pre></div><p>Aliased to <code>just coverage</code>, runs the following conformance test suites by using the conformance runner found in <a href="https://github.com/oxc-project/oxc/tree/main/tasks/coverage" target="_blank" rel="noreferrer">tasks/coverage</a>.</p><h3 id="test262" tabindex="-1">Test262 <a class="header-anchor" href="#test262" aria-label="Permalink to &quot;Test262&quot;">​</a></h3><p>JavaScript has the <a href="https://github.com/tc39/test262" target="_blank" rel="noreferrer">ECMAScript Test Suite</a> called Test262. The goal of Test262 is to provide test material that covers every observable behavior specified in the specification. Parser conformance uses the <a href="https://github.com/tc39/test262/blob/main/INTERPRETING.md#negative" target="_blank" rel="noreferrer">parse phase tests</a>.</p><h3 id="babel" tabindex="-1">Babel <a class="header-anchor" href="#babel" aria-label="Permalink to &quot;Babel&quot;">​</a></h3><p>When new language features are added to JavaScript, it is required to have them implemented by Babel, this means Babel has another set of <a href="https://github.com/babel/babel/tree/main/packages/babel-parser/test" target="_blank" rel="noreferrer">parser tests</a>.</p><h3 id="typescript" tabindex="-1">TypeScript <a class="header-anchor" href="#typescript" aria-label="Permalink to &quot;TypeScript&quot;">​</a></h3><p>The TypeScript conformance tests can be found <a href="https://github.com/microsoft/TypeScript/tree/main/tests/cases/conformance" target="_blank" rel="noreferrer">here</a>.</p><h2 id="test-runner" tabindex="-1">Test Runner <a class="header-anchor" href="#test-runner" aria-label="Permalink to &quot;Test Runner&quot;">​</a></h2><p>Rome has implemented a test runner for the above test suites, they can be found .</p>',13),n=[o];function c(i,l,p,h,d,b){return a(),t("div",null,n)}const m=e(s,[["render",c]]);export{f as __pageData,m as default};
diff --git a/assets/ja_docs_contribute_parser.md.242f07ac.lean.js b/assets/ja_docs_contribute_parser.md.242f07ac.lean.js
new file mode 100644
index 0000000000..31a125a287
--- /dev/null
+++ b/assets/ja_docs_contribute_parser.md.242f07ac.lean.js
@@ -0,0 +1 @@
+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/parser.md","filePath":"ja/docs/contribute/parser.md","lastUpdated":1701053760000}'),s={name:"ja/docs/contribute/parser.md"},o=r("",13),n=[o];function c(i,l,p,h,d,b){return a(),t("div",null,n)}const m=e(s,[["render",c]]);export{f as __pageData,m as default};
diff --git a/assets/ja_docs_contribute_performance.md.b4a85950.js b/assets/ja_docs_contribute_performance.md.b4a85950.js
new file mode 100644
index 0000000000..216371631f
--- /dev/null
+++ b/assets/ja_docs_contribute_performance.md.b4a85950.js
@@ -0,0 +1,13 @@
+import{_ as s,o as e,c as a,Q as n}from"./chunks/framework.725e5b03.js";const E=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/performance.md","filePath":"ja/docs/contribute/performance.md","lastUpdated":1701053760000}'),o={name:"ja/docs/contribute/performance.md"},l=n(`<h1 id="performance-tuning" tabindex="-1">Performance Tuning <a class="header-anchor" href="#performance-tuning" aria-label="Permalink to &quot;Performance Tuning&quot;">​</a></h1><h2 id="compile-time" tabindex="-1">Compile Time <a class="header-anchor" href="#compile-time" aria-label="Permalink to &quot;Compile Time&quot;">​</a></h2><p>While Rust has gained a reputation for its comparatively slower compilation speed, we have dedicated significant effort to fine-tune the Rust compilation speed. Our aim is to minimize any impact on your development workflow, ensuring that developing your own Oxc based tools remains a smooth and efficient experience.</p><p>This is demonstrated by our <a href="https://github.com/oxc-project/oxc/actions/workflows/ci.yml?query=branch%3Amain" target="_blank" rel="noreferrer">CI runs</a>, where warm runs complete in 5 minutes.</p><h2 id="profile" tabindex="-1">Profile <a class="header-anchor" href="#profile" aria-label="Permalink to &quot;Profile&quot;">​</a></h2><h3 id="mac-xcode-instruments" tabindex="-1">Mac Xcode Instruments <a class="header-anchor" href="#mac-xcode-instruments" aria-label="Permalink to &quot;Mac Xcode Instruments&quot;">​</a></h3><p>Mac Xcode instruments can be used to produce a CPU profile.</p><p>To install Xcode Instruments, install the Command Line Tools:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">xcode-select</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--install</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">xcode-select</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--install</span></span></code></pre></div><p>For normal Rust builds, <a href="https://github.com/cmyr/cargo-instruments" target="_blank" rel="noreferrer"><code>cargo instruments</code></a> can be used as the glue for profiling and creating the trace file.</p><p>First, change the profile for showing debug symbols.</p><div class="language-toml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">toml</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">[</span><span style="color:#B392F0;">profile</span><span style="color:#E1E4E8;">.</span><span style="color:#B392F0;">release</span><span style="color:#E1E4E8;">]</span></span>
+<span class="line"><span style="color:#E1E4E8;">debug = </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;"># debug info with line tables only</span></span>
+<span class="line"><span style="color:#E1E4E8;">strip = </span><span style="color:#79B8FF;">false</span><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;"># do not strip symbols</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">[</span><span style="color:#6F42C1;">profile</span><span style="color:#24292E;">.</span><span style="color:#6F42C1;">release</span><span style="color:#24292E;">]</span></span>
+<span class="line"><span style="color:#24292E;">debug = </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> </span><span style="color:#6A737D;"># debug info with line tables only</span></span>
+<span class="line"><span style="color:#24292E;">strip = </span><span style="color:#005CC5;">false</span><span style="color:#24292E;"> </span><span style="color:#6A737D;"># do not strip symbols</span></span></code></pre></div><p>Then build the project</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">build</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--release</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_cli</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--bin</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">build</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--release</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_cli</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--bin</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><p>The binary is located at <code>./target/release/oxlint</code> once the project is built.</p><p>Under the hood, <code>cargo instruments</code> invokes the <code>xcrun</code> command, equivalent to</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">xcrun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">xctrace</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">record</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--template</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&#39;Time Profile&#39;</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--output</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">.</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--launch</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">/path/to/oxc/target/release/oxlint</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--quiet</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">xcrun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">xctrace</span><span style="color:#24292E;"> </span><span style="color:#032F62;">record</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--template</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&#39;Time Profile&#39;</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--output</span><span style="color:#24292E;"> </span><span style="color:#032F62;">.</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--launch</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--</span><span style="color:#24292E;"> </span><span style="color:#032F62;">/path/to/oxc/target/release/oxlint</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--quiet</span></span></code></pre></div><p>Running the command above produces the following output</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">Starting recording with the Time Profiler template. Launching process: oxlint.</span></span>
+<span class="line"><span style="color:#e1e4e8;">Ctrl-C to stop the recording</span></span>
+<span class="line"><span style="color:#e1e4e8;">Target app exited, ending recording...</span></span>
+<span class="line"><span style="color:#e1e4e8;">Recording completed. Saving output file...</span></span>
+<span class="line"><span style="color:#e1e4e8;">Output file saved as: Launch_oxlint_2023-09-03_4.41.45 PM_EB179B85.trace</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">Starting recording with the Time Profiler template. Launching process: oxlint.</span></span>
+<span class="line"><span style="color:#24292e;">Ctrl-C to stop the recording</span></span>
+<span class="line"><span style="color:#24292e;">Target app exited, ending recording...</span></span>
+<span class="line"><span style="color:#24292e;">Recording completed. Saving output file...</span></span>
+<span class="line"><span style="color:#24292e;">Output file saved as: Launch_oxlint_2023-09-03_4.41.45 PM_EB179B85.trace</span></span></code></pre></div><p>Open the trace file <code>open Launch_oxlint_2023-09-03_4.41.45\\ PM_EB179B85.trace</code>.</p><p>To see a top down trace:</p><ol><li>On the top panel, click CPUs</li><li>On the left input box, click <code>x</code> then select <code>Time Profiler</code></li><li>At the bottom panel, click &quot;Call Tree&quot;, turn on &quot;Invert Call Tree&quot; and turn off separate by thread.</li></ol>`,22),p=[l];function t(c,r,i,d,y,u){return e(),a("div",null,p)}const m=s(o,[["render",t]]);export{E as __pageData,m as default};
diff --git a/assets/ja_docs_contribute_performance.md.b4a85950.lean.js b/assets/ja_docs_contribute_performance.md.b4a85950.lean.js
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index 0000000000..bac3b04877
--- /dev/null
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@@ -0,0 +1 @@
+import{_ as s,o as e,c as a,Q as n}from"./chunks/framework.725e5b03.js";const E=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/performance.md","filePath":"ja/docs/contribute/performance.md","lastUpdated":1701053760000}'),o={name:"ja/docs/contribute/performance.md"},l=n("",22),p=[l];function t(c,r,i,d,y,u){return e(),a("div",null,p)}const m=s(o,[["render",t]]);export{E as __pageData,m as default};
diff --git a/assets/ja_docs_contribute_prettier.md.0fcbc08e.js b/assets/ja_docs_contribute_prettier.md.0fcbc08e.js
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index 0000000000..13b0fa311c
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+++ b/assets/ja_docs_contribute_prettier.md.0fcbc08e.js
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+import{_ as t,o as r,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Prettier","description":"","frontmatter":{"title":"Prettier","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/prettier.md","filePath":"ja/docs/contribute/prettier.md","lastUpdated":1701053760000}'),i={name:"ja/docs/contribute/prettier.md"},s=e("h1",{id:"prettier",tabindex:"-1"},[o("Prettier "),e("a",{class:"header-anchor",href:"#prettier","aria-label":'Permalink to "Prettier"'},"​")],-1),c=[s];function n(d,p,l,_,h,m){return r(),a("div",null,c)}const P=t(i,[["render",n]]);export{u as __pageData,P as default};
diff --git a/assets/ja_docs_contribute_prettier.md.0fcbc08e.lean.js b/assets/ja_docs_contribute_prettier.md.0fcbc08e.lean.js
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index 0000000000..13b0fa311c
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+import{_ as t,o as r,c as a,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Prettier","description":"","frontmatter":{"title":"Prettier","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/prettier.md","filePath":"ja/docs/contribute/prettier.md","lastUpdated":1701053760000}'),i={name:"ja/docs/contribute/prettier.md"},s=e("h1",{id:"prettier",tabindex:"-1"},[o("Prettier "),e("a",{class:"header-anchor",href:"#prettier","aria-label":'Permalink to "Prettier"'},"​")],-1),c=[s];function n(d,p,l,_,h,m){return r(),a("div",null,c)}const P=t(i,[["render",n]]);export{u as __pageData,P as default};
diff --git a/assets/ja_docs_contribute_resolver.md.a7d71247.js b/assets/ja_docs_contribute_resolver.md.a7d71247.js
new file mode 100644
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+import{_ as o,o as r,c as t,k as e,a}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/resolver.md","filePath":"ja/docs/contribute/resolver.md","lastUpdated":1701053760000}'),s={name:"ja/docs/contribute/resolver.md"},l=e("h1",{id:"resolver",tabindex:"-1"},[a("Resolver "),e("a",{class:"header-anchor",href:"#resolver","aria-label":'Permalink to "Resolver"'},"​")],-1),n=e("p",null,"Module resolution plays a crucial role in JavaScript tooling, especially for tasks like multi-file analysis or bundling. However, it can often become a performance bottleneck. To address this, we are actively working on porting [enhanced-resolve].",-1),i=e("p",null,"[eslint-plugin-import] will be our first application for the resolver, since it is currently a performance and complexity blocker for a lot of projects.",-1),c=[l,n,i];function d(p,u,_,f,v,m){return r(),t("div",null,c)}const k=o(s,[["render",d]]);export{b as __pageData,k as default};
diff --git a/assets/ja_docs_contribute_resolver.md.a7d71247.lean.js b/assets/ja_docs_contribute_resolver.md.a7d71247.lean.js
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index 0000000000..346eac8faa
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+++ b/assets/ja_docs_contribute_resolver.md.a7d71247.lean.js
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+import{_ as o,o as r,c as t,k as e,a}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/resolver.md","filePath":"ja/docs/contribute/resolver.md","lastUpdated":1701053760000}'),s={name:"ja/docs/contribute/resolver.md"},l=e("h1",{id:"resolver",tabindex:"-1"},[a("Resolver "),e("a",{class:"header-anchor",href:"#resolver","aria-label":'Permalink to "Resolver"'},"​")],-1),n=e("p",null,"Module resolution plays a crucial role in JavaScript tooling, especially for tasks like multi-file analysis or bundling. However, it can often become a performance bottleneck. To address this, we are actively working on porting [enhanced-resolve].",-1),i=e("p",null,"[eslint-plugin-import] will be our first application for the resolver, since it is currently a performance and complexity blocker for a lot of projects.",-1),c=[l,n,i];function d(p,u,_,f,v,m){return r(),t("div",null,c)}const k=o(s,[["render",d]]);export{b as __pageData,k as default};
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+import{_ as t,o,c as a,k as e,a as r}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/transformer.md","filePath":"ja/docs/contribute/transformer.md","lastUpdated":1701053760000}'),s={name:"ja/docs/contribute/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[r("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=e("p",null,[r("A transformer is responsible for turning higher versions of ECMAScript to a lower version that can be used in older browsers. We are currently focusing on an esnext to es2015 transpiler. See the "),e("a",{href:"https://github.com/oxc-project/oxc/issues/974",target:"_blank",rel:"noreferrer"},"umbrella issue"),r(" for details.")],-1),i=[n,c];function l(d,f,m,p,h,u){return o(),a("div",null,i)}const x=t(s,[["render",l]]);export{b as __pageData,x as default};
diff --git a/assets/ja_docs_contribute_transformer.md.f632fd4e.lean.js b/assets/ja_docs_contribute_transformer.md.f632fd4e.lean.js
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+import{_ as t,o,c as a,k as e,a as r}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Transformer","description":"","frontmatter":{"title":"Transformer","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/transformer.md","filePath":"ja/docs/contribute/transformer.md","lastUpdated":1701053760000}'),s={name:"ja/docs/contribute/transformer.md"},n=e("h1",{id:"transformer",tabindex:"-1"},[r("Transformer "),e("a",{class:"header-anchor",href:"#transformer","aria-label":'Permalink to "Transformer"'},"​")],-1),c=e("p",null,[r("A transformer is responsible for turning higher versions of ECMAScript to a lower version that can be used in older browsers. We are currently focusing on an esnext to es2015 transpiler. See the "),e("a",{href:"https://github.com/oxc-project/oxc/issues/974",target:"_blank",rel:"noreferrer"},"umbrella issue"),r(" for details.")],-1),i=[n,c];function l(d,f,m,p,h,u){return o(),a("div",null,i)}const x=t(s,[["render",l]]);export{b as __pageData,x as default};
diff --git a/assets/ja_docs_contribute_vscode.md.f0821a79.js b/assets/ja_docs_contribute_vscode.md.f0821a79.js
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index 0000000000..30d09ad74e
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+import{_ as e,o,c as t,Q as d}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"VSCode Extension","description":"","frontmatter":{"title":"VSCode Extension","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/vscode.md","filePath":"ja/docs/contribute/vscode.md","lastUpdated":1701053760000}'),n={name:"ja/docs/contribute/vscode.md"},a=d('<h1 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Build the extension and run it inside vscode:</p><ol><li><code>pnpm install</code></li><li><code>pnpm run build</code></li><li><code>pnpm run package</code></li><li>open vscode and run the command palette &quot;Extensions: Install from VSIX...&quot;</li><li>find the <code>oxc-vscode-x.x.x.vsix</code> file from <code>./editor/vscode</code> directory</li><li>open a <code>.js</code> / <code>.ts</code> file, add <code>debugger;</code> and save</li><li>see the warning <code>eslint(no-debugger): debugger statement is not allowed - oxc</code></li></ol>',4),i=[a];function c(s,l,r,p,_,u){return o(),t("div",null,i)}const x=e(n,[["render",c]]);export{h as __pageData,x as default};
diff --git a/assets/ja_docs_contribute_vscode.md.f0821a79.lean.js b/assets/ja_docs_contribute_vscode.md.f0821a79.lean.js
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+import{_ as e,o,c as t,Q as d}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"VSCode Extension","description":"","frontmatter":{"title":"VSCode Extension","outline":"deep"},"headers":[],"relativePath":"ja/docs/contribute/vscode.md","filePath":"ja/docs/contribute/vscode.md","lastUpdated":1701053760000}'),n={name:"ja/docs/contribute/vscode.md"},a=d("",4),i=[a];function c(s,l,r,p,_,u){return o(),t("div",null,i)}const x=e(n,[["render",c]]);export{h as __pageData,x as default};
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new file mode 100644
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+import{_ as a,o as s,c as t,k as e,a as c}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"ja/docs/guide/benchmarks.md","filePath":"ja/docs/guide/benchmarks.md","lastUpdated":1701053760000}'),r={name:"ja/docs/guide/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[c("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=e("p",null,"TBD",-1),d=[n,o];function i(h,m,l,_,k,p){return s(),t("div",null,d)}const b=a(r,[["render",i]]);export{f as __pageData,b as default};
diff --git a/assets/ja_docs_guide_introduction.md.e93c04aa.js b/assets/ja_docs_guide_introduction.md.e93c04aa.js
new file mode 100644
index 0000000000..151cab4042
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+import{V as a}from"./chunks/theme.be7b3ccb.js";import{o as t,c as r,H as o,l as e,Q as i}from"./chunks/framework.725e5b03.js";import{C as s}from"./chunks/team.fcc5c8bb.js";const n=i('<h1 id="what-is-oxc" tabindex="-1">What is OXC? <a class="header-anchor" href="#what-is-oxc" aria-label="Permalink to &quot;What is OXC?&quot;">​</a></h1><p>The Oxidation Compiler is a collection of high-performance tools for the JavaScript and TypeScript language.</p><p>We are building a parser, linter, formatter, transpiler, minifier, resolver ... all written in Rust.</p><p>Our goal is to create and empower the fastest and most user friendly tools for <a href="https://www.swyx.io/js-third-age" target="_blank" rel="noreferrer">The Third Age of JavaScript</a>.</p><h2 id="philosophy" tabindex="-1">Philosophy <a class="header-anchor" href="#philosophy" aria-label="Permalink to &quot;Philosophy&quot;">​</a></h2><p>This project shares the same philosophies as <a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a> and <a href="https://beta.ruff.rs" target="_blank" rel="noreferrer">Ruff</a>.</p><ol><li>JavaScript tooling could be rewritten in a more performant language.</li><li>An integrated toolchain can tap into efficiencies that are not available to a disparate set of tools.</li></ol><h2 id="core-team" tabindex="-1">Core Team <a class="header-anchor" href="#core-team" aria-label="Permalink to &quot;Core Team&quot;">​</a></h2>',8),u=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"ja/docs/guide/introduction.md","filePath":"ja/docs/guide/introduction.md","lastUpdated":1701053760000}'),l={name:"ja/docs/guide/introduction.md"},_=Object.assign(l,{setup(h){return(c,d)=>(t(),r("div",null,[n,o(e(a),{size:"medium",members:e(s)},null,8,["members"])]))}});export{u as __pageData,_ as default};
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diff --git a/assets/ja_docs_guide_usage_benchmarks.md.333e4a26.js b/assets/ja_docs_guide_usage_benchmarks.md.333e4a26.js
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+import{_ as a,o as s,c as t,k as e,a as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"ja/docs/guide/usage/benchmarks.md","filePath":"ja/docs/guide/usage/benchmarks.md","lastUpdated":1701053760000}'),c={name:"ja/docs/guide/usage/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[r("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=[n];function d(i,h,m,l,_,k){return s(),t("div",null,o)}const f=a(c,[["render",d]]);export{u as __pageData,f as default};
diff --git a/assets/ja_docs_guide_usage_benchmarks.md.333e4a26.lean.js b/assets/ja_docs_guide_usage_benchmarks.md.333e4a26.lean.js
new file mode 100644
index 0000000000..799d3b8646
--- /dev/null
+++ b/assets/ja_docs_guide_usage_benchmarks.md.333e4a26.lean.js
@@ -0,0 +1 @@
+import{_ as a,o as s,c as t,k as e,a as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Benchmarks","description":"","frontmatter":{"title":"Benchmarks","outline":"deep"},"headers":[],"relativePath":"ja/docs/guide/usage/benchmarks.md","filePath":"ja/docs/guide/usage/benchmarks.md","lastUpdated":1701053760000}'),c={name:"ja/docs/guide/usage/benchmarks.md"},n=e("h1",{id:"benchmarks",tabindex:"-1"},[r("Benchmarks "),e("a",{class:"header-anchor",href:"#benchmarks","aria-label":'Permalink to "Benchmarks"'},"​")],-1),o=[n];function d(i,h,m,l,_,k){return s(),t("div",null,o)}const f=a(c,[["render",d]]);export{u as __pageData,f as default};
diff --git a/assets/ja_docs_guide_usage_linter.md.6d7c833c.js b/assets/ja_docs_guide_usage_linter.md.6d7c833c.js
new file mode 100644
index 0000000000..1dee215804
--- /dev/null
+++ b/assets/ja_docs_guide_usage_linter.md.6d7c833c.js
@@ -0,0 +1,77 @@
+import{_ as a,C as n,o as l,c as e,H as o,Q as p}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxlint","alt":"npm"},{"src":"https://img.shields.io/github/stars/oxc-project/oxc","alt":"GitHub Repo stars"}]},"headers":[],"relativePath":"ja/docs/guide/usage/linter.md","filePath":"ja/docs/guide/usage/linter.md","lastUpdated":1701053760000}'),t={name:"ja/docs/guide/usage/linter.md"},c=p(`<h1 id="oxlint" tabindex="-1">oxlint <a class="header-anchor" href="#oxlint" aria-label="Permalink to &quot;oxlint&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>Runs 50-100x faster than ESLint, and scales with the number of CPU cores (<a href="https://github.com/oxc-project/bench-javascript-linter" target="_blank" rel="noreferrer">Benchmark</a>)</li><li>No configuration required</li><li>Convention over configuration</li><li>Reports errors and useless code by default</li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/ignore#the-eslintignore-file" target="_blank" rel="noreferrer">.eslintignore</a></li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/rules#disabling-rules" target="_blank" rel="noreferrer">ESLint comment disabling</a></li></ul><h2 id="adoptions" tabindex="-1">Adoptions <a class="header-anchor" href="#adoptions" aria-label="Permalink to &quot;Adoptions&quot;">​</a></h2><ul><li>A 5M LOC typescript codebase previously running ESLint parallelized across 48 workers in CI taking 75 mins (12m wall time), it is now 8 seconds on a single worker. (<a href="https://twitter.com/boshen_c/status/1714827365136929029" target="_blank" rel="noreferrer">Source</a>)</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><p>Install <a href="https://www.npmjs.com/package/oxlint" target="_blank" rel="noreferrer">oxlint</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Uhj3_" id="tab-Ayrlbyz" checked="checked"><label for="tab-Ayrlbyz">npm</label><input type="radio" name="group-Uhj3_" id="tab-VnU2bwd"><label for="tab-VnU2bwd">pnpm</label><input type="radio" name="group-Uhj3_" id="tab-LvxNi-p"><label for="tab-LvxNi-p">yarn</label><input type="radio" name="group-Uhj3_" id="tab-N6eOLuP"><label for="tab-N6eOLuP">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div></div></div><p>You can also run oxlint directly:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-BiTwj" id="tab-z8hh0tF" checked="checked"><label for="tab-z8hh0tF">npm</label><input type="radio" name="group-BiTwj" id="tab-yuGRyG4"><label for="tab-yuGRyG4">pnpm</label><input type="radio" name="group-BiTwj" id="tab-dW8zdDA"><label for="tab-dW8zdDA">yarn</label><input type="radio" name="group-BiTwj" id="tab-Kk1FN0V"><label for="tab-Kk1FN0V">bun</label><input type="radio" name="group-BiTwj" id="tab-CmzXplb"><label for="tab-CmzXplb">deno</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bunx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bunx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">deno</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">deno</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div></div></div><p>You can download the binary files from <a href="https://github.com/oxc-project/oxc/releases/latest" target="_blank" rel="noreferrer">the latest GitHub releases</a>.</p><h2 id="integration" tabindex="-1">Integration <a class="header-anchor" href="#integration" aria-label="Permalink to &quot;Integration&quot;">​</a></h2><h3 id="ides" tabindex="-1">IDEs <a class="header-anchor" href="#ides" aria-label="Permalink to &quot;IDEs&quot;">​</a></h3><h4 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h4><p>You can download <a href="https://marketplace.visualstudio.com/items?itemName=oxc.oxc-vscode" target="_blank" rel="noreferrer">the official VSCode extension</a>.</p><h4 id="vim-nvim-coc" tabindex="-1">Vim / Nvim (coc) <a class="header-anchor" href="#vim-nvim-coc" aria-label="Permalink to &quot;Vim / Nvim (coc)&quot;">​</a></h4><p>Add the following config to <code>coc-settings.json</code>:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">{</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#9ECBFF;">&quot;languageserver&quot;</span><span style="color:#E1E4E8;">: {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#9ECBFF;">&quot;oxc&quot;</span><span style="color:#E1E4E8;">: {</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#9ECBFF;">&quot;command&quot;</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">&quot;oxc_vscode&quot;</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#9ECBFF;">&quot;filetypes&quot;</span><span style="color:#E1E4E8;">: [</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;typescript&quot;</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;javascript&quot;</span></span>
+<span class="line"><span style="color:#E1E4E8;">      ],</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#9ECBFF;">&quot;rootPatterns&quot;</span><span style="color:#E1E4E8;">: [</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;.git&quot;</span></span>
+<span class="line"><span style="color:#E1E4E8;">      ]</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">  }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">{</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#032F62;">&quot;languageserver&quot;</span><span style="color:#24292E;">: {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#032F62;">&quot;oxc&quot;</span><span style="color:#24292E;">: {</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#032F62;">&quot;command&quot;</span><span style="color:#24292E;">: </span><span style="color:#032F62;">&quot;oxc_vscode&quot;</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#032F62;">&quot;filetypes&quot;</span><span style="color:#24292E;">: [</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;typescript&quot;</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;javascript&quot;</span></span>
+<span class="line"><span style="color:#24292E;">      ],</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#032F62;">&quot;rootPatterns&quot;</span><span style="color:#24292E;">: [</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;.git&quot;</span></span>
+<span class="line"><span style="color:#24292E;">      ]</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">  }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><h3 id="continuous-integration" tabindex="-1">Continuous Integration <a class="header-anchor" href="#continuous-integration" aria-label="Permalink to &quot;Continuous Integration&quot;">​</a></h3><p>It is recommended to run <code>oxlint</code> before <code>eslint</code> for faster feedback loops, since <code>oxlint</code> only takes a few seconds to run.</p><h4 id="github-actions" tabindex="-1">GitHub Actions <a class="header-anchor" href="#github-actions" aria-label="Permalink to &quot;GitHub Actions&quot;">​</a></h4><div class="language-yaml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">yaml</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#85E89D;">jobs</span><span style="color:#E1E4E8;">:</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#85E89D;">oxlint</span><span style="color:#E1E4E8;">:</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#85E89D;">name</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">Lint JS</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#85E89D;">runs-on</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">ubuntu-latest</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#85E89D;">steps</span><span style="color:#E1E4E8;">:</span></span>
+<span class="line"><span style="color:#E1E4E8;">      - </span><span style="color:#85E89D;">uses</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">actions/checkout@v3</span></span>
+<span class="line"><span style="color:#E1E4E8;">      - </span><span style="color:#85E89D;">run</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">npx --yes oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#22863A;">jobs</span><span style="color:#24292E;">:</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#22863A;">oxlint</span><span style="color:#24292E;">:</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#22863A;">name</span><span style="color:#24292E;">: </span><span style="color:#032F62;">Lint JS</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#22863A;">runs-on</span><span style="color:#24292E;">: </span><span style="color:#032F62;">ubuntu-latest</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#22863A;">steps</span><span style="color:#24292E;">:</span></span>
+<span class="line"><span style="color:#24292E;">      - </span><span style="color:#22863A;">uses</span><span style="color:#24292E;">: </span><span style="color:#032F62;">actions/checkout@v3</span></span>
+<span class="line"><span style="color:#24292E;">      - </span><span style="color:#22863A;">run</span><span style="color:#24292E;">: </span><span style="color:#032F62;">npx --yes oxlint@latest</span></span></code></pre></div><h3 id="nix" tabindex="-1">Nix <a class="header-anchor" href="#nix" aria-label="Permalink to &quot;Nix&quot;">​</a></h3><p>Check <a href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/tools/oxlint/default.nix" target="_blank" rel="noreferrer">nixpkgs repository</a> for more detail.</p><h2 id="commands" tabindex="-1">Commands <a class="header-anchor" href="#commands" aria-label="Permalink to &quot;Commands&quot;">​</a></h2><ul><li><p><code>npx oxlint@latest --rules</code> shows the list of rules</p></li><li><p><code>npx oxlint@latest --help</code> shows usage instructions</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">Usage: oxlint [-A=NAME | -D=NAME]... [--fix] [PATH]...</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Allowing / Denying Multiple Lints</span></span>
+<span class="line"><span style="color:#e1e4e8;">  For example \`-D correctness -A no-debugger\` or \`-A all -D no-debugger\`.</span></span>
+<span class="line"><span style="color:#e1e4e8;">  The default category is &quot;-D correctness&quot;.</span></span>
+<span class="line"><span style="color:#e1e4e8;">  Use &quot;--rules&quot; for rule names.</span></span>
+<span class="line"><span style="color:#e1e4e8;">  Use &quot;--help --help&quot; for rule categories.</span></span>
+<span class="line"><span style="color:#e1e4e8;">    -A, --allow=NAME          Allow the rule or category (suppress the lint)</span></span>
+<span class="line"><span style="color:#e1e4e8;">    -D, --deny=NAME           Deny the rule or category (emit an error)</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Enable Plugins</span></span>
+<span class="line"><span style="color:#e1e4e8;">        --import-plugin       Enable the experimental import plugin and detect ESM problems</span></span>
+<span class="line"><span style="color:#e1e4e8;">        --jest-plugin         Enable the Jest plugin and detect test problems</span></span>
+<span class="line"><span style="color:#e1e4e8;">        --jsx-a11y-plugin     Enable the JSX-a11y plugin and detect accessibility problems</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Available positional items:</span></span>
+<span class="line"><span style="color:#e1e4e8;">    PATH                      Single file, single path or list of paths</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Available options:</span></span>
+<span class="line"><span style="color:#e1e4e8;">    -h, --help                Prints help information</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">Usage: oxlint [-A=NAME | -D=NAME]... [--fix] [PATH]...</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Allowing / Denying Multiple Lints</span></span>
+<span class="line"><span style="color:#24292e;">  For example \`-D correctness -A no-debugger\` or \`-A all -D no-debugger\`.</span></span>
+<span class="line"><span style="color:#24292e;">  The default category is &quot;-D correctness&quot;.</span></span>
+<span class="line"><span style="color:#24292e;">  Use &quot;--rules&quot; for rule names.</span></span>
+<span class="line"><span style="color:#24292e;">  Use &quot;--help --help&quot; for rule categories.</span></span>
+<span class="line"><span style="color:#24292e;">    -A, --allow=NAME          Allow the rule or category (suppress the lint)</span></span>
+<span class="line"><span style="color:#24292e;">    -D, --deny=NAME           Deny the rule or category (emit an error)</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Enable Plugins</span></span>
+<span class="line"><span style="color:#24292e;">        --import-plugin       Enable the experimental import plugin and detect ESM problems</span></span>
+<span class="line"><span style="color:#24292e;">        --jest-plugin         Enable the Jest plugin and detect test problems</span></span>
+<span class="line"><span style="color:#24292e;">        --jsx-a11y-plugin     Enable the JSX-a11y plugin and detect accessibility problems</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Available positional items:</span></span>
+<span class="line"><span style="color:#24292e;">    PATH                      Single file, single path or list of paths</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Available options:</span></span>
+<span class="line"><span style="color:#24292e;">    -h, --help                Prints help information</span></span></code></pre></div></li></ul><h2 id="system-requirements" tabindex="-1">System Requirements <a class="header-anchor" href="#system-requirements" aria-label="Permalink to &quot;System Requirements&quot;">​</a></h2><p><code>oxlint</code> is built for the following systems:</p><ul><li>darwin-arm64</li><li>darwin-x64</li><li>linux-arm64</li><li>linux-x64</li><li>win32-arm64</li><li>win32-x64</li></ul>`,29);function r(i,y,d,E,u,h){const s=n("AppBadgeList");return l(),e("div",null,[o(s),c])}const F=a(t,[["render",r]]);export{b as __pageData,F as default};
diff --git a/assets/ja_docs_guide_usage_linter.md.6d7c833c.lean.js b/assets/ja_docs_guide_usage_linter.md.6d7c833c.lean.js
new file mode 100644
index 0000000000..d0ca926b17
--- /dev/null
+++ b/assets/ja_docs_guide_usage_linter.md.6d7c833c.lean.js
@@ -0,0 +1 @@
+import{_ as a,C as n,o as l,c as e,H as o,Q as p}from"./chunks/framework.725e5b03.js";const b=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxlint","alt":"npm"},{"src":"https://img.shields.io/github/stars/oxc-project/oxc","alt":"GitHub Repo stars"}]},"headers":[],"relativePath":"ja/docs/guide/usage/linter.md","filePath":"ja/docs/guide/usage/linter.md","lastUpdated":1701053760000}'),t={name:"ja/docs/guide/usage/linter.md"},c=p("",29);function r(i,y,d,E,u,h){const s=n("AppBadgeList");return l(),e("div",null,[o(s),c])}const F=a(t,[["render",r]]);export{b as __pageData,F as default};
diff --git a/assets/ja_docs_guide_usage_parser.md.0185a423.js b/assets/ja_docs_guide_usage_parser.md.0185a423.js
new file mode 100644
index 0000000000..639919e953
--- /dev/null
+++ b/assets/ja_docs_guide_usage_parser.md.0185a423.js
@@ -0,0 +1 @@
+import{_ as a,C as e,o as l,c as o,H as p,Q as n}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-parser","alt":"npm"}]},"headers":[],"relativePath":"ja/docs/guide/usage/parser.md","filePath":"ja/docs/guide/usage/parser.md","lastUpdated":1701053760000}'),t={name:"ja/docs/guide/usage/parser.md"},r=n('<h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>2x faster then <a href="https://swc.rs" target="_blank" rel="noreferrer">SWC</a> parser</li><li>By far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust</li></ul><p>You can check <a href="https://github.com/oxc-project/bench-javascript-parser-written-in-rust" target="_blank" rel="noreferrer">benchmark</a> for more detail.</p><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install crates:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_ast</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_ast</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_parser</span></span></code></pre></div><ul><li>The umbrella crate <a href="https://docs.rs/oxc" target="_blank" rel="noreferrer">oxc</a> exports all public crates from this repository</li><li>The AST and parser crates <a href="https://docs.rs/oxc_ast" target="_blank" rel="noreferrer">oxc_ast</a> and <a href="https://docs.rs/oxc_parser" target="_blank" rel="noreferrer">oxc_parser</a> are production ready</li></ul><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-parser" target="_blank" rel="noreferrer">oxc-parser</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-KvOiP" id="tab-xZkigvR" checked="checked"><label for="tab-xZkigvR">npm</label><input type="radio" name="group-KvOiP" id="tab-gs-yod1"><label for="tab-gs-yod1">pnpm</label><input type="radio" name="group-KvOiP" id="tab-RRUnTBt"><label for="tab-RRUnTBt">yarn</label><input type="radio" name="group-KvOiP" id="tab-f4VgZ2U"><label for="tab-f4VgZ2U">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div>',14);function c(i,d,y,E,h,u){const s=e("AppBadgeList");return l(),o("div",null,[p(s),r])}const b=a(t,[["render",c]]);export{g as __pageData,b as default};
diff --git a/assets/ja_docs_guide_usage_parser.md.0185a423.lean.js b/assets/ja_docs_guide_usage_parser.md.0185a423.lean.js
new file mode 100644
index 0000000000..a102e3ca19
--- /dev/null
+++ b/assets/ja_docs_guide_usage_parser.md.0185a423.lean.js
@@ -0,0 +1 @@
+import{_ as a,C as e,o as l,c as o,H as p,Q as n}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-parser","alt":"npm"}]},"headers":[],"relativePath":"ja/docs/guide/usage/parser.md","filePath":"ja/docs/guide/usage/parser.md","lastUpdated":1701053760000}'),t={name:"ja/docs/guide/usage/parser.md"},r=n("",14);function c(i,d,y,E,h,u){const s=e("AppBadgeList");return l(),o("div",null,[p(s),r])}const b=a(t,[["render",c]]);export{g as __pageData,b as default};
diff --git a/assets/ja_docs_guide_usage_philosophy.md.cc97835a.js b/assets/ja_docs_guide_usage_philosophy.md.cc97835a.js
new file mode 100644
index 0000000000..5e09084bd1
--- /dev/null
+++ b/assets/ja_docs_guide_usage_philosophy.md.cc97835a.js
@@ -0,0 +1 @@
+import{_ as o,o as a,c as s,k as e,a as t}from"./chunks/framework.725e5b03.js";const y=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"ja/docs/guide/usage/philosophy.md","filePath":"ja/docs/guide/usage/philosophy.md","lastUpdated":1701053760000}'),i={name:"ja/docs/guide/usage/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[t("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=[h];function d(l,r,c,n,_,u){return a(),s("div",null,p)}const f=o(i,[["render",d]]);export{y as __pageData,f as default};
diff --git a/assets/ja_docs_guide_usage_philosophy.md.cc97835a.lean.js b/assets/ja_docs_guide_usage_philosophy.md.cc97835a.lean.js
new file mode 100644
index 0000000000..5e09084bd1
--- /dev/null
+++ b/assets/ja_docs_guide_usage_philosophy.md.cc97835a.lean.js
@@ -0,0 +1 @@
+import{_ as o,o as a,c as s,k as e,a as t}from"./chunks/framework.725e5b03.js";const y=JSON.parse('{"title":"Philosophy","description":"","frontmatter":{"title":"Philosophy","outline":"deep"},"headers":[],"relativePath":"ja/docs/guide/usage/philosophy.md","filePath":"ja/docs/guide/usage/philosophy.md","lastUpdated":1701053760000}'),i={name:"ja/docs/guide/usage/philosophy.md"},h=e("h1",{id:"philosophy",tabindex:"-1"},[t("Philosophy "),e("a",{class:"header-anchor",href:"#philosophy","aria-label":'Permalink to "Philosophy"'},"​")],-1),p=[h];function d(l,r,c,n,_,u){return a(),s("div",null,p)}const f=o(i,[["render",d]]);export{y as __pageData,f as default};
diff --git a/assets/ja_docs_guide_usage_resolver.md.8d81200e.js b/assets/ja_docs_guide_usage_resolver.md.8d81200e.js
new file mode 100644
index 0000000000..49d990ab21
--- /dev/null
+++ b/assets/ja_docs_guide_usage_resolver.md.8d81200e.js
@@ -0,0 +1,33 @@
+import{_ as a,C as n,o as l,c as p,H as o,Q as e}from"./chunks/framework.725e5b03.js";const v=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-resolver","alt":"npm"}]},"headers":[],"relativePath":"ja/docs/guide/usage/resolver.md","filePath":"ja/docs/guide/usage/resolver.md","lastUpdated":1701053760000}'),t={name:"ja/docs/guide/usage/resolver.md"},r=e(`<h1 id="resolver" tabindex="-1">Resolver <a class="header-anchor" href="#resolver" aria-label="Permalink to &quot;Resolver&quot;">​</a></h1><p>Node.js Module Resolution.</p><ul><li>Feature complete</li><li>All configuration options are aligned with enhanced-resolve</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install <a href="https://crates.io/oxc_resolver" target="_blank" rel="noreferrer">oxc_resolver</a> crate:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_resolver</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_resolver</span></span></code></pre></div><p>You should also check <a href="https://docs.rs/oxc_resolver" target="_blank" rel="noreferrer">documentation</a>.</p><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-resolver" target="_blank" rel="noreferrer">oxc-resolver</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-vFOGo" id="tab-MDR39qy" checked="checked"><label for="tab-MDR39qy">npm</label><input type="radio" name="group-vFOGo" id="tab-8UE___B"><label for="tab-8UE___B">pnpm</label><input type="radio" name="group-vFOGo" id="tab-iE_UGAV"><label for="tab-iE_UGAV">yarn</label><input type="radio" name="group-vFOGo" id="tab-iuqsfL6"><label for="tab-iuqsfL6">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div><h2 id="example" tabindex="-1">Example <a class="header-anchor" href="#example" aria-label="Permalink to &quot;Example&quot;">​</a></h2><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{env, </span><span style="color:#B392F0;">path</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">PathBuf</span><span style="color:#E1E4E8;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">oxc_resolver</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{</span><span style="color:#B392F0;">ResolveOptions</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">Resolver</span><span style="color:#E1E4E8;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">main</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> path </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">env</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">args</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">nth</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">expect</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;require path&quot;</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> request </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">env</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">args</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">nth</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">2</span><span style="color:#E1E4E8;">)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">expect</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;require request&quot;</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> path </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">PathBuf</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">from</span><span style="color:#E1E4E8;">(path)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">canonicalize</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">unwrap</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">println!</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;path: {path:?}&quot;</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">println!</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;request: {request}&quot;</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">match</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Resolver</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">ResolveOptions</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">default</span><span style="color:#E1E4E8;">())</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">resolve</span><span style="color:#E1E4E8;">(path, </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">request) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">Err</span><span style="color:#E1E4E8;">(error) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">println!</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;Error: {error}&quot;</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">Ok</span><span style="color:#E1E4E8;">(resolution) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">println!</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;Resolved: {}&quot;</span><span style="color:#E1E4E8;">, resolution</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">full_path</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">to_string_lossy</span><span style="color:#E1E4E8;">()),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">{env, </span><span style="color:#6F42C1;">path</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">PathBuf</span><span style="color:#24292E;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">oxc_resolver</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">{</span><span style="color:#6F42C1;">ResolveOptions</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">Resolver</span><span style="color:#24292E;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">main</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> path </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">env</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">args</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">nth</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">expect</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;require path&quot;</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> request </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">env</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">args</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">nth</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">2</span><span style="color:#24292E;">)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">expect</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;require request&quot;</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> path </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">PathBuf</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">from</span><span style="color:#24292E;">(path)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">canonicalize</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">unwrap</span><span style="color:#24292E;">();</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;path: {path:?}&quot;</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;request: {request}&quot;</span><span style="color:#24292E;">);</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">match</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Resolver</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">ResolveOptions</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">default</span><span style="color:#24292E;">())</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">resolve</span><span style="color:#24292E;">(path, </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">request) {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Err</span><span style="color:#24292E;">(error) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;Error: {error}&quot;</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Ok</span><span style="color:#24292E;">(resolution) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;Resolved: {}&quot;</span><span style="color:#24292E;">, resolution</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">full_path</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">to_string_lossy</span><span style="color:#24292E;">()),</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div>`,13);function c(y,E,i,F,d,u){const s=n("AppBadgeList");return l(),p("div",null,[o(s),r])}const C=a(t,[["render",c]]);export{v as __pageData,C as default};
diff --git a/assets/ja_docs_guide_usage_resolver.md.8d81200e.lean.js b/assets/ja_docs_guide_usage_resolver.md.8d81200e.lean.js
new file mode 100644
index 0000000000..7aa8743f8d
--- /dev/null
+++ b/assets/ja_docs_guide_usage_resolver.md.8d81200e.lean.js
@@ -0,0 +1 @@
+import{_ as a,C as n,o as l,c as p,H as o,Q as e}from"./chunks/framework.725e5b03.js";const v=JSON.parse('{"title":"Resolver","description":"","frontmatter":{"title":"Resolver","outline":"deep","badges":[{"src":"https://img.shields.io/npm/dw/oxc-resolver","alt":"npm"}]},"headers":[],"relativePath":"ja/docs/guide/usage/resolver.md","filePath":"ja/docs/guide/usage/resolver.md","lastUpdated":1701053760000}'),t={name:"ja/docs/guide/usage/resolver.md"},r=e("",13);function c(y,E,i,F,d,u){const s=n("AppBadgeList");return l(),p("div",null,[o(s),r])}const C=a(t,[["render",c]]);export{v as __pageData,C as default};
diff --git a/assets/ja_docs_learn_architecture_formatter.md.e9e4c97a.js b/assets/ja_docs_learn_architecture_formatter.md.e9e4c97a.js
new file mode 100644
index 0000000000..71291c7219
--- /dev/null
+++ b/assets/ja_docs_learn_architecture_formatter.md.e9e4c97a.js
@@ -0,0 +1 @@
+import{_ as t,o as a,c as r,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Formatter","description":"","frontmatter":{"title":"Formatter","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/architecture/formatter.md","filePath":"ja/docs/learn/architecture/formatter.md","lastUpdated":1701053760000}'),c={name:"ja/docs/learn/architecture/formatter.md"},s=e("h1",{id:"formatter",tabindex:"-1"},[o("Formatter "),e("a",{class:"header-anchor",href:"#formatter","aria-label":'Permalink to "Formatter"'},"​")],-1),n=[s];function d(i,m,l,f,_,h){return a(),r("div",null,n)}const x=t(c,[["render",d]]);export{u as __pageData,x as default};
diff --git a/assets/ja_docs_learn_architecture_formatter.md.e9e4c97a.lean.js b/assets/ja_docs_learn_architecture_formatter.md.e9e4c97a.lean.js
new file mode 100644
index 0000000000..71291c7219
--- /dev/null
+++ b/assets/ja_docs_learn_architecture_formatter.md.e9e4c97a.lean.js
@@ -0,0 +1 @@
+import{_ as t,o as a,c as r,k as e,a as o}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Formatter","description":"","frontmatter":{"title":"Formatter","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/architecture/formatter.md","filePath":"ja/docs/learn/architecture/formatter.md","lastUpdated":1701053760000}'),c={name:"ja/docs/learn/architecture/formatter.md"},s=e("h1",{id:"formatter",tabindex:"-1"},[o("Formatter "),e("a",{class:"header-anchor",href:"#formatter","aria-label":'Permalink to "Formatter"'},"​")],-1),n=[s];function d(i,m,l,f,_,h){return a(),r("div",null,n)}const x=t(c,[["render",d]]);export{u as __pageData,x as default};
diff --git a/assets/ja_docs_learn_architecture_introduction.md.45104dba.js b/assets/ja_docs_learn_architecture_introduction.md.45104dba.js
new file mode 100644
index 0000000000..87d28232fb
--- /dev/null
+++ b/assets/ja_docs_learn_architecture_introduction.md.45104dba.js
@@ -0,0 +1 @@
+import{_ as e,o,c as a,k as t,a as n}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/architecture/introduction.md","filePath":"ja/docs/learn/architecture/introduction.md","lastUpdated":1701053760000}'),r={name:"ja/docs/learn/architecture/introduction.md"},c=t("h1",{id:"introduction",tabindex:"-1"},[n("Introduction "),t("a",{class:"header-anchor",href:"#introduction","aria-label":'Permalink to "Introduction"'},"​")],-1),i=[c];function d(s,l,u,_,h,p){return o(),a("div",null,i)}const x=e(r,[["render",d]]);export{f as __pageData,x as default};
diff --git a/assets/ja_docs_learn_architecture_introduction.md.45104dba.lean.js b/assets/ja_docs_learn_architecture_introduction.md.45104dba.lean.js
new file mode 100644
index 0000000000..87d28232fb
--- /dev/null
+++ b/assets/ja_docs_learn_architecture_introduction.md.45104dba.lean.js
@@ -0,0 +1 @@
+import{_ as e,o,c as a,k as t,a as n}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Introduction","description":"","frontmatter":{"title":"Introduction","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/architecture/introduction.md","filePath":"ja/docs/learn/architecture/introduction.md","lastUpdated":1701053760000}'),r={name:"ja/docs/learn/architecture/introduction.md"},c=t("h1",{id:"introduction",tabindex:"-1"},[n("Introduction "),t("a",{class:"header-anchor",href:"#introduction","aria-label":'Permalink to "Introduction"'},"​")],-1),i=[c];function d(s,l,u,_,h,p){return o(),a("div",null,i)}const x=e(r,[["render",d]]);export{f as __pageData,x as default};
diff --git a/assets/ja_docs_learn_architecture_linter.md.a9524693.js b/assets/ja_docs_learn_architecture_linter.md.a9524693.js
new file mode 100644
index 0000000000..a923ad03a4
--- /dev/null
+++ b/assets/ja_docs_learn_architecture_linter.md.a9524693.js
@@ -0,0 +1 @@
+import{_ as a,o as r,c as n,k as e,a as t}from"./chunks/framework.725e5b03.js";const f=JSON.parse('{"title":"Linter","description":"","frontmatter":{"title":"Linter","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/architecture/linter.md","filePath":"ja/docs/learn/architecture/linter.md","lastUpdated":1701053760000}'),l={name:"ja/docs/learn/architecture/linter.md"},i=e("h1",{id:"example",tabindex:"-1"},[t("Example "),e("a",{class:"header-anchor",href:"#example","aria-label":'Permalink to "Example"'},"​")],-1),o=e("p",null,[t("See "),e("code",null,"crates/oxc_linter/examples/linter.rs"),t(" for the bare minimum linter implementation.")],-1),c=[i,o];function s(d,m,p,_,h,u){return r(),n("div",null,c)}const k=a(l,[["render",s]]);export{f as __pageData,k as default};
diff --git a/assets/ja_docs_learn_architecture_linter.md.a9524693.lean.js b/assets/ja_docs_learn_architecture_linter.md.a9524693.lean.js
new file mode 100644
index 0000000000..a923ad03a4
--- /dev/null
+++ b/assets/ja_docs_learn_architecture_linter.md.a9524693.lean.js
@@ -0,0 +1 @@
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index 0000000000..a6add6002c
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+import{_ as i,o as a,c as t,k as e,a as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Minifier","description":"","frontmatter":{"title":"Minifier","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/architecture/minifier.md","filePath":"ja/docs/learn/architecture/minifier.md","lastUpdated":1701053760000}'),n={name:"ja/docs/learn/architecture/minifier.md"},c=e("h1",{id:"minifier",tabindex:"-1"},[r("Minifier "),e("a",{class:"header-anchor",href:"#minifier","aria-label":'Permalink to "Minifier"'},"​")],-1),o=[c];function s(d,f,l,m,_,h){return a(),t("div",null,o)}const x=i(n,[["render",s]]);export{u as __pageData,x as default};
diff --git a/assets/ja_docs_learn_architecture_parser.md.f8c02391.js b/assets/ja_docs_learn_architecture_parser.md.f8c02391.js
new file mode 100644
index 0000000000..2f44353389
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+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/architecture/parser.md","filePath":"ja/docs/learn/architecture/parser.md","lastUpdated":1701053760000}'),i={name:"ja/docs/learn/architecture/parser.md"},o=r('<h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>Oxc maintains its own AST and parser, which is by far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust.</p><p>As the parser often represents a key performance bottleneck in JavaScript tooling, any minor improvements can have a cascading effect on our downstream tools. By developing our parser, we have the opportunity to explore and implement well-researched performance techniques.</p><p>While many existing JavaScript tools rely on [estree] as their AST specification, a notable drawback is its abundance of ambiguous nodes. This ambiguity often leads to confusion during development with [estree].</p><p>The Oxc AST differs slightly from the [estree] AST by removing ambiguous nodes and introducing distinct types. For example, instead of using a generic [estree] <code>Identifier</code>, the Oxc AST provides specific types such as <code>BindingIdentifier</code>, <code>IdentifierReference</code>, and <code>IdentifierName</code>.</p><p>This clear distinction greatly enhances the development experience by aligning more closely with the ECMAScript specification.</p><h2 id="how-is-it-so-fast" tabindex="-1">How is it so fast <a class="header-anchor" href="#how-is-it-so-fast" aria-label="Permalink to &quot;How is it so fast&quot;">​</a></h2><ul><li>AST is allocated in a <a href="https://crates.io/crates/bumpalo" target="_blank" rel="noreferrer">memory arena</a> for fast AST memory allocation and deallocation</li><li>Short strings are inlined by <a href="https://crates.io/crates/compact_str" target="_blank" rel="noreferrer">CompactString</a></li><li>No other heap allocations are done except the above two</li><li>Scope binding, symbol resolution and some syntax errors are not done in the parser, they are delegated to the semantic analyzer</li></ul>',8),n=[o];function s(c,l,d,p,h,f){return a(),t("div",null,n)}const _=e(i,[["render",s]]);export{u as __pageData,_ as default};
diff --git a/assets/ja_docs_learn_architecture_parser.md.f8c02391.lean.js b/assets/ja_docs_learn_architecture_parser.md.f8c02391.lean.js
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+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Parser","description":"","frontmatter":{"title":"Parser","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/architecture/parser.md","filePath":"ja/docs/learn/architecture/parser.md","lastUpdated":1701053760000}'),i={name:"ja/docs/learn/architecture/parser.md"},o=r("",8),n=[o];function s(c,l,d,p,h,f){return a(),t("div",null,n)}const _=e(i,[["render",s]]);export{u as __pageData,_ as default};
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diff --git a/assets/ja_docs_learn_ecmascript_grammar.md.53196869.js b/assets/ja_docs_learn_ecmascript_grammar.md.53196869.js
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+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Grammar","description":"","frontmatter":{"title":"Grammar","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/ecmascript/grammar.md","filePath":"ja/docs/learn/ecmascript/grammar.md","lastUpdated":1701053760000}'),o={name:"ja/docs/learn/ecmascript/grammar.md"},l=e(`<p>JavaScript has one of the most challenging grammar to parse, this tutorial details all the sweat and tears I had while learning it.</p><h2 id="ll-1-grammar" tabindex="-1">LL(1) Grammar <a class="header-anchor" href="#ll-1-grammar" aria-label="Permalink to &quot;LL(1) Grammar&quot;">​</a></h2><p>According to <a href="https://en.wikipedia.org/wiki/LL_grammar" target="_blank" rel="noreferrer">Wikipedia</a>,</p><blockquote><p>an LL grammar is a context-free grammar that can be parsed by an LL parser, which parses the input from Left to right</p></blockquote><p>The first <strong>L</strong> means the scanning the source from <strong>L</strong>eft to right, and the second <strong>L</strong> means the construction of a <strong>L</strong>eftmost derivation tree.</p><p>Context-free and the (1) in LL(1) means a tree can be constructed by just peeking at the next token and nothing else.</p><p>LL Grammars are of particular interest in academia because we are lazy human beings and we want to write programs that generate parsers automatically so we don&#39;t need to write parsers by hand.</p><p>Unfortunately, most industrial programming languages do not have a nice LL(1) grammar, and this applies to JavaScript too.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>Mozilla started the <a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a> project a few years ago and wrote a <a href="https://github.com/mozilla-spidermonkey/jsparagus/tree/master/jsparagus" target="_blank" rel="noreferrer">LALR parser generator in Python</a>. They haven&#39;t updated it much in the past two years and they sent a strong message at the end of <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">js-quirks.md</a></p><blockquote><p>What have we learned today?</p><ul><li>Do not write a JS parser.</li><li>JavaScript has some syntactic horrors in it. But hey, you don&#39;t make the world&#39;s most widely used programming language by avoiding all mistakes. You do it by shipping a serviceable tool, in the right circumstances, for the right users.</li></ul></blockquote></div><hr><p>The only practical way to parse JavaScript is to write a recursive descent parser by hand because of the nature of its grammar, so let&#39;s learn all the quirks in the grammar before we shoot ourselves in the foot.</p><p>The list below starts simple and will become difficult to grasp, so please take grab a coffee and take your time.</p><h2 id="identifiers" tabindex="-1">Identifiers <a class="header-anchor" href="#identifiers" aria-label="Permalink to &quot;Identifiers&quot;">​</a></h2><p>There are three types of identifiers defined in <code>#sec-identifiers</code>,</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">IdentifierReference[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">BindingIdentifier[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">LabelIdentifier[Yield, Await] :</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">IdentifierReference[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">BindingIdentifier[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">LabelIdentifier[Yield, Await] :</span></span></code></pre></div><p><code>estree</code> and some ASTs do not distinguish the above identifiers, and the specification does not explain them in plain text.</p><p><code>BindingIdentifier</code>s are declarations and <code>IdentifierReference</code>s are references to binding identifiers. For example in <code>var foo = bar</code>, <code>foo</code> is a <code>BindingIdentifier</code> and <code>bar</code> is a <code>IdentifierReference</code> in the grammar:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">VariableDeclaration[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    BindingIdentifier[?Yield, ?Await] Initializer[?In, ?Yield, ?Await] opt</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Initializer[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    = AssignmentExpression[?In, ?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">VariableDeclaration[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    BindingIdentifier[?Yield, ?Await] Initializer[?In, ?Yield, ?Await] opt</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Initializer[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    = AssignmentExpression[?In, ?Yield, ?Await]</span></span></code></pre></div><p>follow <code>AssignmentExpression</code> into <code>PrimaryExpression</code> we get</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">PrimaryExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    IdentifierReference[?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">PrimaryExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    IdentifierReference[?Yield, ?Await]</span></span></code></pre></div><p>Declaring these identifiers differently in the AST will greatly simply downstream tools, especially for semantic analysis.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">BindingIdentifier</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> name</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Atom</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">IdentifierReference</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> name</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Atom</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">BindingIdentifier</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> name</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Atom</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">IdentifierReference</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> name</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Atom</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><hr><h2 id="class-and-strict-mode" tabindex="-1">Class and Strict Mode <a class="header-anchor" href="#class-and-strict-mode" aria-label="Permalink to &quot;Class and Strict Mode&quot;">​</a></h2><p>ECMAScript Class is born after strict mode, so they decided that everything inside a class must be strict mode for simplicity. It is stated as such in <code>#sec-class-definitions</code> with just a <code>Node: A class definition is always strict mode code.</code></p><p>It is easy to declare strict mode by associating it with function scopes, but a <code>class</code> declaration does not have a scope, we need to keep an extra state just for parsing classes.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/swc-project/swc/blob/f9c4eff94a133fa497778328fa0734aa22d5697c/crates/swc_ecma_parser/src/parser/class_and_fn.rs#L85</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/swc-project/swc/blob/f9c4eff94a133fa497778328fa0734aa22d5697c/crates/swc_ecma_parser/src/parser/class_and_fn.rs#L85</span></span></code></pre></div><hr><h2 id="legacy-octal-and-use-strict" tabindex="-1">Legacy Octal and Use Strict <a class="header-anchor" href="#legacy-octal-and-use-strict" aria-label="Permalink to &quot;Legacy Octal and Use Strict&quot;">​</a></h2><p><code>#sec-string-literals-early-errors</code> disallows escaped legacy octal inside strings <code>&quot;\\01&quot;</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">EscapeSequence ::</span></span>
+<span class="line"><span style="color:#e1e4e8;">    LegacyOctalEscapeSequence</span></span>
+<span class="line"><span style="color:#e1e4e8;">    NonOctalDecimalEscapeSequence</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">It is a Syntax Error if the source text matched by this production is strict mode code.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">EscapeSequence ::</span></span>
+<span class="line"><span style="color:#24292e;">    LegacyOctalEscapeSequence</span></span>
+<span class="line"><span style="color:#24292e;">    NonOctalDecimalEscapeSequence</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">It is a Syntax Error if the source text matched by this production is strict mode code.</span></span></code></pre></div><p>The best place to detect this is inside the lexer, it can ask the parser for strict mode state and throw errors accordingly.</p><p>But, this becomes impossible when mixed with directives:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">https</span><span style="color:#E1E4E8;">:</span><span style="color:#6A737D;">//github.com/tc39/test262/blob/747bed2e8aaafe8fdf2c65e8a10dd7ae64f66c47/test/language/literals/string/legacy-octal-escape-sequence-prologue-strict.js#L16-L19</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">https</span><span style="color:#24292E;">:</span><span style="color:#6A737D;">//github.com/tc39/test262/blob/747bed2e8aaafe8fdf2c65e8a10dd7ae64f66c47/test/language/literals/string/legacy-octal-escape-sequence-prologue-strict.js#L16-L19</span></span></code></pre></div><p><code>use strict</code> is declared after the escaped legacy octal, yet the syntax error needs to be thrown. Fortunately, no real code uses directives with legacy octals ... unless you want to pass the test262 case from above.</p><hr><h2 id="non-simple-parameter-and-strict-mode" tabindex="-1">Non-simple Parameter and Strict Mode <a class="header-anchor" href="#non-simple-parameter-and-strict-mode" aria-label="Permalink to &quot;Non-simple Parameter and Strict Mode&quot;">​</a></h2><p>Identical function parameters is allowed in non-strict mode <code>function foo(a, a) { }</code>, and we can forbid this by adding <code>use strict</code>: <code>function foo(a, a) { &quot;use strict&quot; }</code>. Later on in es6, other grammars were added to function parameters, for example <code>function foo({ a }, b = c) {}</code>.</p><p>Now, what happens if we write the following where &quot;01&quot; is a strict mode error?</p><div class="language-javaScript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javaScript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">(</span><span style="color:#FFAB70;">value</span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;">() { </span><span style="color:#F97583;">return</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;</span><span style="color:#79B8FF;">\\01</span><span style="color:#9ECBFF;">&quot;</span><span style="color:#E1E4E8;"> }())) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#9ECBFF;">&quot;use strict&quot;</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">return</span><span style="color:#E1E4E8;"> value;</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">(</span><span style="color:#E36209;">value</span><span style="color:#D73A49;">=</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">function</span><span style="color:#24292E;">() { </span><span style="color:#D73A49;">return</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;</span><span style="color:#005CC5;">\\01</span><span style="color:#032F62;">&quot;</span><span style="color:#24292E;"> }())) {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#032F62;">&quot;use strict&quot;</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">return</span><span style="color:#24292E;"> value;</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>More specifically, what should we do if there is a strict mode syntax error inside the parameters thinking from the parser perspective? So in <code>#sec-function-definitions-static-semantics-early-errors</code>, it just bans this by stating</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">FunctionDeclaration :</span></span>
+<span class="line"><span style="color:#e1e4e8;">FunctionExpression :</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">It is a Syntax Error if FunctionBodyContainsUseStrict of FunctionBody is true and IsSimpleParameterList of FormalParameters is false.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">FunctionDeclaration :</span></span>
+<span class="line"><span style="color:#24292e;">FunctionExpression :</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">It is a Syntax Error if FunctionBodyContainsUseStrict of FunctionBody is true and IsSimpleParameterList of FormalParameters is false.</span></span></code></pre></div><p>Chrome throws this error with a mysterious message &quot;Uncaught SyntaxError: Illegal &#39;use strict&#39; directive in function with non-simple parameter list&quot;.</p><p>A more in-depth explanation is described in <a href="https://humanwhocodes.com/blog/2016/10/the-ecmascript-2016-change-you-probably-dont-know/" target="_blank" rel="noreferrer">this blog post</a> by the author of ESLint.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>Fun fact, the above rule does not apply if we are targeting <code>es5</code> in TypeScript, it transpiles to</p><div class="language-javaScript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javaScript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">(</span><span style="color:#FFAB70;">a</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">b</span><span style="color:#E1E4E8;">) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#9ECBFF;">&quot;use strict&quot;</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> (b </span><span style="color:#F97583;">===</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">void</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">0</span><span style="color:#E1E4E8;">) { b </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;</span><span style="color:#79B8FF;">\\01</span><span style="color:#9ECBFF;">&quot;</span><span style="color:#E1E4E8;">; }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">(</span><span style="color:#E36209;">a</span><span style="color:#24292E;">, </span><span style="color:#E36209;">b</span><span style="color:#24292E;">) {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#032F62;">&quot;use strict&quot;</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> (b </span><span style="color:#D73A49;">===</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">void</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">0</span><span style="color:#24292E;">) { b </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;</span><span style="color:#005CC5;">\\01</span><span style="color:#032F62;">&quot;</span><span style="color:#24292E;">; }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div></div><hr><h2 id="parenthesized-expression" tabindex="-1">Parenthesized Expression <a class="header-anchor" href="#parenthesized-expression" aria-label="Permalink to &quot;Parenthesized Expression&quot;">​</a></h2><p>Parenthesized expressions are supposed to not have any semantic meanings? For instance the AST for <code>((x))</code> can just be a single <code>IdentifierReference</code>, not <code>ParenthesizedExpression</code> -&gt; <code>ParenthesizedExpression</code> -&gt; <code>IdentifierReference</code>. And this is the case for JavaScript grammar.</p><p>But ... who would have thought it can have run-time meanings. Found in <a href="https://github.com/estree/estree/issues/194" target="_blank" rel="noreferrer">this estree issue</a>, it shows that</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> () {};</span></span>
+<span class="line"><span style="color:#F97583;">&gt;</span><span style="color:#E1E4E8;"> fn.name</span></span>
+<span class="line"><span style="color:#F97583;">&lt;</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;fn&quot;</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">&gt;</span><span style="color:#E1E4E8;"> (fn) </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> () {};</span></span>
+<span class="line"><span style="color:#F97583;">&gt;</span><span style="color:#E1E4E8;"> fn.name</span></span>
+<span class="line"><span style="color:#F97583;">&lt;</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&#39;&#39;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">fn</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> () {};</span></span>
+<span class="line"><span style="color:#D73A49;">&gt;</span><span style="color:#24292E;"> fn.name</span></span>
+<span class="line"><span style="color:#D73A49;">&lt;</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;fn&quot;</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">&gt;</span><span style="color:#24292E;"> (fn) </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> () {};</span></span>
+<span class="line"><span style="color:#D73A49;">&gt;</span><span style="color:#24292E;"> fn.name</span></span>
+<span class="line"><span style="color:#D73A49;">&lt;</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&#39;&#39;</span></span></code></pre></div><p>So eventually acorn and babel added the <code>preserveParens</code> option for compatibility.</p><hr><h2 id="function-declaration-in-if-statement" tabindex="-1">Function Declaration in If Statement <a class="header-anchor" href="#function-declaration-in-if-statement" aria-label="Permalink to &quot;Function Declaration in If Statement&quot;">​</a></h2><p>If we follow the grammar precisely in <code>#sec-ecmascript-language-statements-and-declarations</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">Statement[Yield, Await, Return] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ... lots of statements</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Declaration[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ... declarations</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">Statement[Yield, Await, Return] :</span></span>
+<span class="line"><span style="color:#24292e;">    ... lots of statements</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Declaration[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ... declarations</span></span></code></pre></div><p>The <code>Statement</code> node we define for our AST would obviously not contain <code>Declaration</code>,</p><p>but in Annex B <code>#sec-functiondeclarations-in-ifstatement-statement-clauses</code>, it allows declaration inside the statement position of <code>if</code> statements in non-strict mode:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> (x) </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">() {}</span></span>
+<span class="line"><span style="color:#F97583;">else</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bar</span><span style="color:#E1E4E8;">() {}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">if</span><span style="color:#24292E;"> (x) </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">() {}</span></span>
+<span class="line"><span style="color:#D73A49;">else</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bar</span><span style="color:#24292E;">() {}</span></span></code></pre></div><hr><h2 id="label-statement-is-legit" tabindex="-1">Label statement is legit <a class="header-anchor" href="#label-statement-is-legit" aria-label="Permalink to &quot;Label statement is legit&quot;">​</a></h2><p>We probably have never written a single line of labelled statement, but it is legit in modern JavaScript and not banned by strict mode.</p><p>The following syntax is correct, it returns a labelled statement (not object literal).</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">&lt;</span><span style="color:#79B8FF;">Foo</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#B392F0;">bar</span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;">{() </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">baz</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">&quot;quaz&quot;</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">  }}</span></span>
+<span class="line"><span style="color:#E1E4E8;">/&gt;</span></span>
+<span class="line"><span style="color:#6A737D;">//   ^^^^^^^^^^^ \`LabelledStatement\`</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">&lt;</span><span style="color:#005CC5;">Foo</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#6F42C1;">bar</span><span style="color:#D73A49;">=</span><span style="color:#24292E;">{() </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">baz</span><span style="color:#24292E;">: </span><span style="color:#032F62;">&quot;quaz&quot;</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">  }}</span></span>
+<span class="line"><span style="color:#24292E;">/&gt;</span></span>
+<span class="line"><span style="color:#6A737D;">//   ^^^^^^^^^^^ \`LabelledStatement\`</span></span></code></pre></div><hr><h2 id="let-is-not-a-keyword" tabindex="-1"><code>let</code> is not a keyword <a class="header-anchor" href="#let-is-not-a-keyword" aria-label="Permalink to &quot;\`let\` is not a keyword&quot;">​</a></h2><p><code>let</code> is not a keyword so it is allowed to appear anywhere unless the grammar explicitly states <code>let</code> is not allowed in such positions. Parsers need to peek at the token after the <code>let</code> token and decide what it needs to be parsed into, e.g.:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> a;</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> foo;</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> instanceof x;</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> + 1;</span></span>
+<span class="line"><span style="color:#F97583;">while</span><span style="color:#E1E4E8;"> (</span><span style="color:#79B8FF;">true</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">a </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;">[</span><span style="color:#79B8FF;">0</span><span style="color:#E1E4E8;">];</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> a;</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> foo;</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> instanceof x;</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> + 1;</span></span>
+<span class="line"><span style="color:#D73A49;">while</span><span style="color:#24292E;"> (</span><span style="color:#005CC5;">true</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">let</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">a </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">let</span><span style="color:#24292E;">[</span><span style="color:#005CC5;">0</span><span style="color:#24292E;">];</span></span></code></pre></div><hr><h2 id="for-in-for-of-and-the-in-context" tabindex="-1">For-in / For-of and the [In] context <a class="header-anchor" href="#for-in-for-of-and-the-in-context" aria-label="Permalink to &quot;For-in / For-of and the [In] context&quot;">​</a></h2><p>If we look at the grammar for <code>for-in</code> and <code>for-of</code> in <code>#prod-ForInOfStatement</code>, it is immediately confusing to understand how to parse these.</p><p>There are two major obstacles for us to understand: the <code>[lookahead ≠ let]</code> part and the <code>[+In]</code> part.</p><p>If we have parsed to <code>for (let</code>, we need to check the peeking token is:</p><ul><li>not <code>in</code> to disallow <code>for (let in)</code></li><li>is <code>{</code>, <code>[</code> or an identifier to allow <code>for (let {} = foo)</code>, <code>for (let [] = foo)</code> and <code>for (let bar = foo)</code></li></ul><p>Once reached the <code>of</code> or <code>in</code> keyword, the right-hand side expression needs to be passed with the correct [+In] context to disallow the two <code>in</code> expressions in <code>#prod-RelationalExpression</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">RelationalExpression[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    [+In] RelationalExpression[+In, ?Yield, ?Await] in ShiftExpression[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;">    [+In] PrivateIdentifier in ShiftExpression[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Note 2: The [In] grammar parameter is needed to avoid confusing the in operator in a relational expression with the in operator in a for statement.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">RelationalExpression[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    [+In] RelationalExpression[+In, ?Yield, ?Await] in ShiftExpression[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;">    [+In] PrivateIdentifier in ShiftExpression[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Note 2: The [In] grammar parameter is needed to avoid confusing the in operator in a relational expression with the in operator in a for statement.</span></span></code></pre></div><p>And this is the only application for the <code>[In]</code> context in the entire specification.</p><p>Also to note, the grammar <code>[lookahead ∉ { let, async of }]</code> forbids <code>for (async of ...)</code>, and it needs to be explicitly guarded against.</p><hr><h2 id="block-level-function-declarations" tabindex="-1">Block-Level Function Declarations <a class="header-anchor" href="#block-level-function-declarations" aria-label="Permalink to &quot;Block-Level Function Declarations&quot;">​</a></h2><p>In Annex B.3.2 <code>#sec-block-level-function-declarations-web-legacy-compatibility-semantics</code>, an entire page is dedicated to explain how <code>FunctionDeclaration</code> is supposed to behave in <code>Block</code> statements. It boils down to</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">https</span><span style="color:#E1E4E8;">:</span><span style="color:#6A737D;">//github.com/acornjs/acorn/blob/11735729c4ebe590e406f952059813f250a4cbd1/acorn/src/scope.js#L30-L35</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">https</span><span style="color:#24292E;">:</span><span style="color:#6A737D;">//github.com/acornjs/acorn/blob/11735729c4ebe590e406f952059813f250a4cbd1/acorn/src/scope.js#L30-L35</span></span></code></pre></div><p>The name of a <code>FunctionDeclaration</code> needs to be treated the same as a <code>var</code> declaration if its inside a function declaration. This code snippet errors with a re-declaration error since <code>bar</code> is inside a block scope:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> (</span><span style="color:#79B8FF;">true</span><span style="color:#E1E4E8;">) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bar</span><span style="color:#E1E4E8;">() {} </span><span style="color:#6A737D;">// redeclaration error</span></span>
+<span class="line"><span style="color:#E1E4E8;">  }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> (</span><span style="color:#005CC5;">true</span><span style="color:#24292E;">) {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">var</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bar</span><span style="color:#24292E;">() {} </span><span style="color:#6A737D;">// redeclaration error</span></span>
+<span class="line"><span style="color:#24292E;">  }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>meanwhile, the following does not error because it is inside a function scope, function <code>bar</code> is treated as a var declaration:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bar</span><span style="color:#E1E4E8;">() {}</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">var</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bar</span><span style="color:#24292E;">() {}</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><hr><h2 id="grammar-context" tabindex="-1">Grammar Context <a class="header-anchor" href="#grammar-context" aria-label="Permalink to &quot;Grammar Context&quot;">​</a></h2><p>The syntactic grammar has 5 context parameters for allowing and disallowing certain constructs, namely <code>[In]</code>, <code>[Return]</code>, <code>[Yield]</code>, <code>[Await]</code> and <code>[Default]</code>.</p><p>It is best to keep a context during parsing, for example in Rome:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/5a059c0413baf1d54436ac0c149a829f0dfd1f4d/crates/rome_js_parser/src/state.rs#L404-L425</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/5a059c0413baf1d54436ac0c149a829f0dfd1f4d/crates/rome_js_parser/src/state.rs#L404-L425</span></span></code></pre></div><p>And toggle and check these flags accordingly by following the grammar.</p><h2 id="assignmentpattern-vs-bindingpattern" tabindex="-1">AssignmentPattern vs BindingPattern <a class="header-anchor" href="#assignmentpattern-vs-bindingpattern" aria-label="Permalink to &quot;AssignmentPattern vs BindingPattern&quot;">​</a></h2><p>In <code>estree</code>, the left-hand side of an <code>AssignmentExpression</code> is a <code>Pattern</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">extend interface AssignmentExpression {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    left: Pattern;</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">extend interface AssignmentExpression {</span></span>
+<span class="line"><span style="color:#24292e;">    left: Pattern;</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span></code></pre></div><p>and the left-hand side of a <code>VariableDeclarator</code> is a <code>Pattern</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">interface VariableDeclarator &lt;: Node {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    type: &quot;VariableDeclarator&quot;;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    id: Pattern;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    init: Expression | null;</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">interface VariableDeclarator &lt;: Node {</span></span>
+<span class="line"><span style="color:#24292e;">    type: &quot;VariableDeclarator&quot;;</span></span>
+<span class="line"><span style="color:#24292e;">    id: Pattern;</span></span>
+<span class="line"><span style="color:#24292e;">    init: Expression | null;</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span></code></pre></div><p>A <code>Pattern</code> can be a <code>Identifier</code>, <code>ObjectPattern</code>, <code>ArrayPattern</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">interface Identifier &lt;: Expression, Pattern {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    type: &quot;Identifier&quot;;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    name: string;</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">interface ObjectPattern &lt;: Pattern {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    type: &quot;ObjectPattern&quot;;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    properties: [ AssignmentProperty ];</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">interface ArrayPattern &lt;: Pattern {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    type: &quot;ArrayPattern&quot;;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    elements: [ Pattern | null ];</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">interface Identifier &lt;: Expression, Pattern {</span></span>
+<span class="line"><span style="color:#24292e;">    type: &quot;Identifier&quot;;</span></span>
+<span class="line"><span style="color:#24292e;">    name: string;</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">interface ObjectPattern &lt;: Pattern {</span></span>
+<span class="line"><span style="color:#24292e;">    type: &quot;ObjectPattern&quot;;</span></span>
+<span class="line"><span style="color:#24292e;">    properties: [ AssignmentProperty ];</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">interface ArrayPattern &lt;: Pattern {</span></span>
+<span class="line"><span style="color:#24292e;">    type: &quot;ArrayPattern&quot;;</span></span>
+<span class="line"><span style="color:#24292e;">    elements: [ Pattern | null ];</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span></code></pre></div><p>But from the specification perspective, we have the following JavaScript:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#6A737D;">// AssignmentExpression:</span></span>
+<span class="line"><span style="color:#E1E4E8;">{ foo } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">^^^</span><span style="color:#E1E4E8;"> IdentifierReference</span></span>
+<span class="line"><span style="color:#E1E4E8;">[ foo ] </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">^^^</span><span style="color:#E1E4E8;"> IdentifierReference</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6A737D;">// VariableDeclarator</span></span>
+<span class="line"><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> { foo } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#F97583;">^^^</span><span style="color:#E1E4E8;"> BindingIdentifier</span></span>
+<span class="line"><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> [ foo ] </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#F97583;">^^^</span><span style="color:#E1E4E8;"> BindingIdentifier</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6A737D;">// AssignmentExpression:</span></span>
+<span class="line"><span style="color:#24292E;">{ foo } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">^^^</span><span style="color:#24292E;"> IdentifierReference</span></span>
+<span class="line"><span style="color:#24292E;">[ foo ] </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">^^^</span><span style="color:#24292E;"> IdentifierReference</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6A737D;">// VariableDeclarator</span></span>
+<span class="line"><span style="color:#D73A49;">var</span><span style="color:#24292E;"> { foo } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#D73A49;">^^^</span><span style="color:#24292E;"> BindingIdentifier</span></span>
+<span class="line"><span style="color:#D73A49;">var</span><span style="color:#24292E;"> [ foo ] </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#D73A49;">^^^</span><span style="color:#24292E;"> BindingIdentifier</span></span></code></pre></div><p>This starts to become confusing because we now have a situation where we cannot directly distinguish whether the <code>Identifier</code> is a <code>BindingIdentifier</code> or a <code>IdentifierReference</code> inside a <code>Pattern</code>:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Pattern</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Identifier</span><span style="color:#E1E4E8;">,</span><span style="color:#6A737D;"> // Is this a \`BindingIdentifier\` or a \`IdentifierReference\`?</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ArrayPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ObjectPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Pattern</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Identifier</span><span style="color:#24292E;">,</span><span style="color:#6A737D;"> // Is this a \`BindingIdentifier\` or a \`IdentifierReference\`?</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ArrayPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ObjectPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>This will lead to all sorts of unnecessary code further down the parser pipeline. For example, when setting up the scope for semantic analysis, we need to inspect the parents of this <code>Identifier</code> to determine whether we should bind it to the scope or not.</p><p>A better solution is to fully understand the specification and decide what to do.</p><p>The grammar for <code>AssignmentExpression</code> and <code>VariableDeclaration</code> are defined as:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">13.15 Assignment Operators</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">AssignmentExpression[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    LeftHandSideExpression[?Yield, ?Await] = AssignmentExpression[?In, ?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">13.15.5 Destructuring Assignment</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">In certain circumstances when processing an instance of the production</span></span>
+<span class="line"><span style="color:#e1e4e8;">AssignmentExpression : LeftHandSideExpression = AssignmentExpression</span></span>
+<span class="line"><span style="color:#e1e4e8;">the interpretation of LeftHandSideExpression is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">AssignmentPattern[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ObjectAssignmentPattern[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ArrayAssignmentPattern[?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">13.15 Assignment Operators</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">AssignmentExpression[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    LeftHandSideExpression[?Yield, ?Await] = AssignmentExpression[?In, ?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">13.15.5 Destructuring Assignment</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">In certain circumstances when processing an instance of the production</span></span>
+<span class="line"><span style="color:#24292e;">AssignmentExpression : LeftHandSideExpression = AssignmentExpression</span></span>
+<span class="line"><span style="color:#24292e;">the interpretation of LeftHandSideExpression is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">AssignmentPattern[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ObjectAssignmentPattern[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;">    ArrayAssignmentPattern[?Yield, ?Await]</span></span></code></pre></div><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">14.3.2 Variable Statement</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">VariableDeclaration[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    BindingIdentifier[?Yield, ?Await] Initializer[?In, ?Yield, ?Await]opt</span></span>
+<span class="line"><span style="color:#e1e4e8;">    BindingPattern[?Yield, ?Await] Initializer[?In, ?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">14.3.2 Variable Statement</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">VariableDeclaration[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    BindingIdentifier[?Yield, ?Await] Initializer[?In, ?Yield, ?Await]opt</span></span>
+<span class="line"><span style="color:#24292e;">    BindingPattern[?Yield, ?Await] Initializer[?In, ?Yield, ?Await]</span></span></code></pre></div><p>The specification distinguishes this two grammar by defining them separately with an <code>AssignmentPattern</code> and a <code>BindingPattern</code>.</p><p>So in situations like this, do not be afraid to deviate from <code>estree</code> and define extra AST nodes for our parser:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">BindingPattern</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">BindingIdentifier</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ObjectBindingPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ArrayBindingPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AssignmentPattern</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">IdentifierReference</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ObjectAssignmentPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ArrayAssignmentPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">BindingPattern</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">BindingIdentifier</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ObjectBindingPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ArrayBindingPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AssignmentPattern</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">IdentifierReference</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ObjectAssignmentPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ArrayAssignmentPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>I was in a super confusing state for a whole week until I finally reached enlightenment: we need to define an <code>AssignmentPattern</code> node and a <code>BindingPattern</code> node instead of a single <code>Pattern</code> node.</p><ul><li><code>estree</code> must be correct because people have been using it for years so it cannot be wrong?</li><li>how are we going to cleanly distinguish the <code>Identifier</code>s inside the patterns without defining two separate nodes? I just cannot find where the grammar is?</li><li>After a whole day of navigating the specification ... the grammar for <code>AssignmentPattern</code> is in the 5th subsection of the main section &quot;13.15 Assignment Operators&quot; with the subtitle &quot;Supplemental Syntax&quot; 🤯 - this is really out of place because all grammar is defined in the main section, not like this one defined after the &quot;Runtime Semantics&quot; section</li></ul><hr><p>:::caution The following cases are really difficult to grasp. Here be dragons. :::</p><h2 id="ambiguous-grammar" tabindex="-1">Ambiguous Grammar <a class="header-anchor" href="#ambiguous-grammar" aria-label="Permalink to &quot;Ambiguous Grammar&quot;">​</a></h2><p>Let&#39;s first think like a parser and solve the problem - given the <code>/</code> token, is it a division operator or the start of a regex expression?</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">a </span><span style="color:#F97583;">/</span><span style="color:#E1E4E8;"> b;</span></span>
+<span class="line"><span style="color:#E1E4E8;">a </span><span style="color:#F97583;">/</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;"> regex </span><span style="color:#9ECBFF;">/</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">a </span><span style="color:#F97583;">/=</span><span style="color:#DBEDFF;"> </span><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;"> regex </span><span style="color:#9ECBFF;">/</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;"> regex </span><span style="color:#9ECBFF;">/</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">/</span><span style="color:#E1E4E8;"> b;</span></span>
+<span class="line"><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;">=</span><span style="color:#9ECBFF;">/</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;"> </span><span style="color:#9ECBFF;">/</span><span style="color:#F97583;">=/</span><span style="color:#E1E4E8;">;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">a </span><span style="color:#D73A49;">/</span><span style="color:#24292E;"> b;</span></span>
+<span class="line"><span style="color:#24292E;">a </span><span style="color:#D73A49;">/</span><span style="color:#24292E;"> </span><span style="color:#032F62;">/ regex /</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">a </span><span style="color:#D73A49;">/=</span><span style="color:#032F62;"> / regex /</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#032F62;">/ regex /</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">/</span><span style="color:#24292E;"> b;</span></span>
+<span class="line"><span style="color:#032F62;">/=/</span><span style="color:#24292E;"> </span><span style="color:#032F62;">/ /</span><span style="color:#D73A49;">=/</span><span style="color:#24292E;">;</span></span></code></pre></div><p>It is almost impossible, isn&#39;t it? Let&#39;s break these down and follow the grammar.</p><p>The first thing we need to understand is that the syntactic grammar drives the lexical grammar as stated in <code>#sec-ecmascript-language-lexical-grammar</code></p><blockquote><p>There are several situations where the identification of lexical input elements is sensitive to the syntactic grammar context that is consuming the input elements.</p></blockquote><p>This means that the parser is responsible for telling the lexer which token to return next. The above example indicates that the lexer needs to return either a <code>/</code> token or a <code>RegExp</code> token. For getting the correct <code>/</code> or <code>RegExp</code> token, the specification says:</p><blockquote><p>The InputElementRegExp goal symbol is used in all syntactic grammar contexts where a RegularExpressionLiteral is permitted ... In all other contexts, InputElementDiv is used as the lexical goal symbol.</p></blockquote><p>And the syntax for <code>InputElementDiv</code> and <code>InputElementRegExp</code> are</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">InputElementDiv ::</span></span>
+<span class="line"><span style="color:#e1e4e8;">    WhiteSpace</span></span>
+<span class="line"><span style="color:#e1e4e8;">    LineTerminator</span></span>
+<span class="line"><span style="color:#e1e4e8;">    Comment</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CommonToken</span></span>
+<span class="line"><span style="color:#e1e4e8;">    DivPunctuator &lt;---------- the \`/\` and \`/=\` token</span></span>
+<span class="line"><span style="color:#e1e4e8;">    RightBracePunctuator</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">InputElementRegExp ::</span></span>
+<span class="line"><span style="color:#e1e4e8;">    WhiteSpace</span></span>
+<span class="line"><span style="color:#e1e4e8;">    LineTerminator</span></span>
+<span class="line"><span style="color:#e1e4e8;">    Comment</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CommonToken</span></span>
+<span class="line"><span style="color:#e1e4e8;">    RightBracePunctuator</span></span>
+<span class="line"><span style="color:#e1e4e8;">    RegularExpressionLiteral &lt;-------- the \`RegExp\` token</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">InputElementDiv ::</span></span>
+<span class="line"><span style="color:#24292e;">    WhiteSpace</span></span>
+<span class="line"><span style="color:#24292e;">    LineTerminator</span></span>
+<span class="line"><span style="color:#24292e;">    Comment</span></span>
+<span class="line"><span style="color:#24292e;">    CommonToken</span></span>
+<span class="line"><span style="color:#24292e;">    DivPunctuator &lt;---------- the \`/\` and \`/=\` token</span></span>
+<span class="line"><span style="color:#24292e;">    RightBracePunctuator</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">InputElementRegExp ::</span></span>
+<span class="line"><span style="color:#24292e;">    WhiteSpace</span></span>
+<span class="line"><span style="color:#24292e;">    LineTerminator</span></span>
+<span class="line"><span style="color:#24292e;">    Comment</span></span>
+<span class="line"><span style="color:#24292e;">    CommonToken</span></span>
+<span class="line"><span style="color:#24292e;">    RightBracePunctuator</span></span>
+<span class="line"><span style="color:#24292e;">    RegularExpressionLiteral &lt;-------- the \`RegExp\` token</span></span></code></pre></div><p>This means whenever the grammar reaches <code>RegularExpressionLiteral</code>, <code>/</code> need to be tokenized as a <code>RegExp</code> token (and throw an error if it does not have a matching <code>/</code>). All other cases we&#39;ll tokenize <code>/</code> as a slash token.</p><p>Let&#39;s walk through an example:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">a / / regex /</span></span>
+<span class="line"><span style="color:#e1e4e8;">^ ------------ PrimaryExpression:: IdentifierReference</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ^ ---------- MultiplicativeExpression: MultiplicativeExpression MultiplicativeOperator ExponentiationExpression</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ^^^^^^^^ - PrimaryExpression: RegularExpressionLiteral</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">a / / regex /</span></span>
+<span class="line"><span style="color:#24292e;">^ ------------ PrimaryExpression:: IdentifierReference</span></span>
+<span class="line"><span style="color:#24292e;">  ^ ---------- MultiplicativeExpression: MultiplicativeExpression MultiplicativeOperator ExponentiationExpression</span></span>
+<span class="line"><span style="color:#24292e;">    ^^^^^^^^ - PrimaryExpression: RegularExpressionLiteral</span></span></code></pre></div><p>This statement does not match any other start of <code>Statement</code>, so it&#39;ll go down the <code>ExpressionStatement</code> route:</p><p><code>ExpressionStatement</code> --&gt; <code>Expression</code> --&gt; <code>AssignmentExpression</code> --&gt; ... --&gt; <code>MultiplicativeExpression</code> --&gt; ... --&gt; <code>MemberExpression</code> --&gt; <code>PrimaryExpression</code> --&gt; <code>IdentifierReference</code>.</p><p>We stopped at <code>IdentifierReference</code> and not <code>RegularExpressionLiteral</code>, the statement &quot;In all other contexts, InputElementDiv is used as the lexical goal symbol&quot; applies. The first slash is a <code>DivPunctuator</code> token.</p><p>Since this is a <code>DivPunctuator</code> token, the grammar <code>MultiplicativeExpression: MultiplicativeExpression MultiplicativeOperator ExponentiationExpression</code> is matched, the right-hand side is expected to be an <code>ExponentiationExpression</code>.</p><p>Now we are at the second slash in <code>a / /</code>. By following <code>ExponentiationExpression</code>, we reach <code>PrimaryExpression: RegularExpressionLiteral</code> because <code>RegularExpressionLiteral</code> is the only matching grammar with a <code>/</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">RegularExpressionLiteral ::</span></span>
+<span class="line"><span style="color:#e1e4e8;">    / RegularExpressionBody / RegularExpressionFlags</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">RegularExpressionLiteral ::</span></span>
+<span class="line"><span style="color:#24292e;">    / RegularExpressionBody / RegularExpressionFlags</span></span></code></pre></div><p>This second <code>/</code> will be tokenized as <code>RegExp</code> because the specification states &quot;The InputElementRegExp goal symbol is used in all syntactic grammar contexts where a RegularExpressionLiteral is permitted&quot;.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>As an exercise, try and follow the grammar for <code>/=/ / /=/</code>.</p></div><hr><h2 id="cover-grammar" tabindex="-1">Cover Grammar <a class="header-anchor" href="#cover-grammar" aria-label="Permalink to &quot;Cover Grammar&quot;">​</a></h2><p>Read the <a href="https://v8.dev/blog/understanding-ecmascript-part-4" target="_blank" rel="noreferrer">V8 blog post</a> on this topic first.</p><p>To summarize, the specification states the following three cover grammars:</p><h4 id="coverparenthesizedexpressionandarrowparameterlist" tabindex="-1">CoverParenthesizedExpressionAndArrowParameterList <a class="header-anchor" href="#coverparenthesizedexpressionandarrowparameterlist" aria-label="Permalink to &quot;CoverParenthesizedExpressionAndArrowParameterList&quot;">​</a></h4><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">PrimaryExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#e1e4e8;">PrimaryExpression[Yield, Await] : CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;">    the interpretation of CoverParenthesizedExpressionAndArrowParameterList is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">ParenthesizedExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ( Expression[+In, ?Yield, ?Await] )</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">PrimaryExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#24292e;">PrimaryExpression[Yield, Await] : CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;">    the interpretation of CoverParenthesizedExpressionAndArrowParameterList is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">ParenthesizedExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ( Expression[+In, ?Yield, ?Await] )</span></span></code></pre></div><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ArrowFunction[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ArrowParameters[?Yield, ?Await] [no LineTerminator here] =&gt; ConciseBody[?In]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">ArrowParameters[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    BindingIdentifier[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ArrowFunction[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ArrowParameters[?Yield, ?Await] [no LineTerminator here] =&gt; ConciseBody[?In]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">ArrowParameters[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    BindingIdentifier[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;">    CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span></code></pre></div><p>These definitions defines:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> foo </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> (a, b, c); </span><span style="color:#6A737D;">// SequenceExpression</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bar</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> (</span><span style="color:#FFAB70;">a</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">b</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">c</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {}; </span><span style="color:#6A737D;">// ArrowExpression</span></span>
+<span class="line"><span style="color:#E1E4E8;">          </span><span style="color:#F97583;">^^^^^^^^^</span><span style="color:#E1E4E8;"> CoverParenthesizedExpressionAndArrowParameterList</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> foo </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> (a, b, c); </span><span style="color:#6A737D;">// SequenceExpression</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bar</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> (</span><span style="color:#E36209;">a</span><span style="color:#24292E;">, </span><span style="color:#E36209;">b</span><span style="color:#24292E;">, </span><span style="color:#E36209;">c</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {}; </span><span style="color:#6A737D;">// ArrowExpression</span></span>
+<span class="line"><span style="color:#24292E;">          </span><span style="color:#D73A49;">^^^^^^^^^</span><span style="color:#24292E;"> CoverParenthesizedExpressionAndArrowParameterList</span></span></code></pre></div><p>A simple but cumbersome approach to solving this problem is to parse it as a <code>Vec&lt;Expression&gt;</code> first, then write a converter function to convert it to <code>ArrowParameters</code> node, i.e. each individual <code>Expression</code> need to be converted to a <code>BindingPattern</code>.</p><p>It should be noted that, if we are building the scope tree within the parser, i.e. create the scope for arrow expression during parsing, but do not create one for a sequence expression, it is not obvious how to do this. <a href="https://github.com/evanw/esbuild" target="_blank" rel="noreferrer">esbuild</a> solved this problem by creating a temporary scope first, and then dropping it if it is not an <code>ArrowExpression</code>.</p><p>This is stated in its <a href="https://github.com/evanw/esbuild/blob/master/docs/architecture.md#symbols-and-scopes" target="_blank" rel="noreferrer">architecture document</a>:</p><blockquote><p>This is mostly pretty straightforward except for a few places where the parser has pushed a scope and is in the middle of parsing a declaration only to discover that it&#39;s not a declaration after all. This happens in TypeScript when a function is forward-declared without a body, and in JavaScript when it&#39;s ambiguous whether a parenthesized expression is an arrow function or not until we reach the =&gt; token afterwards. This would be solved by doing three passes instead of two so we finish parsing before starting to set up scopes and declare symbols, but we&#39;re trying to do this in just two passes. So instead we call popAndDiscardScope() or popAndFlattenScope() instead of popScope() to modify the scope tree later if our assumptions turn out to be incorrect.</p></blockquote><hr><h4 id="covercallexpressionandasyncarrowhead" tabindex="-1">CoverCallExpressionAndAsyncArrowHead <a class="header-anchor" href="#covercallexpressionandasyncarrowhead" aria-label="Permalink to &quot;CoverCallExpressionAndAsyncArrowHead&quot;">​</a></h4><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">CallExpression :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverCallExpressionAndAsyncArrowHead</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#e1e4e8;">CallExpression : CoverCallExpressionAndAsyncArrowHead</span></span>
+<span class="line"><span style="color:#e1e4e8;">the interpretation of CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">CallMemberExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">CallExpression :</span></span>
+<span class="line"><span style="color:#24292e;">    CoverCallExpressionAndAsyncArrowHead</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#24292e;">CallExpression : CoverCallExpressionAndAsyncArrowHead</span></span>
+<span class="line"><span style="color:#24292e;">the interpretation of CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">CallMemberExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]</span></span></code></pre></div><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">AsyncArrowFunction[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await] [no LineTerminator here] =&gt; AsyncConciseBody[?In]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">CoverCallExpressionAndAsyncArrowHead[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#e1e4e8;">AsyncArrowFunction : CoverCallExpressionAndAsyncArrowHead =&gt; AsyncConciseBody</span></span>
+<span class="line"><span style="color:#e1e4e8;">the interpretation of CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">AsyncArrowHead :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    async [no LineTerminator here] ArrowFormalParameters[~Yield, +Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">AsyncArrowFunction[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await] [no LineTerminator here] =&gt; AsyncConciseBody[?In]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">CoverCallExpressionAndAsyncArrowHead[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#24292e;">AsyncArrowFunction : CoverCallExpressionAndAsyncArrowHead =&gt; AsyncConciseBody</span></span>
+<span class="line"><span style="color:#24292e;">the interpretation of CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">AsyncArrowHead :</span></span>
+<span class="line"><span style="color:#24292e;">    async [no LineTerminator here] ArrowFormalParameters[~Yield, +Await]</span></span></code></pre></div><p>These definitions define:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">async</span><span style="color:#E1E4E8;"> (a, b, c); </span><span style="color:#6A737D;">// CallExpression</span></span>
+<span class="line"><span style="color:#F97583;">async</span><span style="color:#E1E4E8;"> (</span><span style="color:#FFAB70;">a</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">b</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">c</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {} </span><span style="color:#6A737D;">// AsyncArrowFunction</span></span>
+<span class="line"><span style="color:#F97583;">^^^^^^^^^^^^^^^</span><span style="color:#E1E4E8;"> CoverCallExpressionAndAsyncArrowHead</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">async</span><span style="color:#24292E;"> (a, b, c); </span><span style="color:#6A737D;">// CallExpression</span></span>
+<span class="line"><span style="color:#D73A49;">async</span><span style="color:#24292E;"> (</span><span style="color:#E36209;">a</span><span style="color:#24292E;">, </span><span style="color:#E36209;">b</span><span style="color:#24292E;">, </span><span style="color:#E36209;">c</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {} </span><span style="color:#6A737D;">// AsyncArrowFunction</span></span>
+<span class="line"><span style="color:#D73A49;">^^^^^^^^^^^^^^^</span><span style="color:#24292E;"> CoverCallExpressionAndAsyncArrowHead</span></span></code></pre></div><p>This looks strange because <code>async</code> is not a keyword. The first <code>async</code> is a function name.</p><hr><h4 id="coverinitializedname" tabindex="-1">CoverInitializedName <a class="header-anchor" href="#coverinitializedname" aria-label="Permalink to &quot;CoverInitializedName&quot;">​</a></h4><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">13.2.5 Object Initializer</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">ObjectLiteral[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ...</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">PropertyDefinition[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverInitializedName[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Note 3: In certain contexts, ObjectLiteral is used as a cover grammar for a more restricted secondary grammar.</span></span>
+<span class="line"><span style="color:#e1e4e8;">The CoverInitializedName production is necessary to fully cover these secondary grammars. However, use of this production results in an early Syntax Error in normal contexts where an actual ObjectLiteral is expected.</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">13.2.5.1 Static Semantics: Early Errors</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">In addition to describing an actual object initializer the ObjectLiteral productions are also used as a cover grammar for ObjectAssignmentPattern and may be recognized as part of a CoverParenthesizedExpressionAndArrowParameterList. When ObjectLiteral appears in a context where ObjectAssignmentPattern is required the following Early Error rules are not applied. In addition, they are not applied when initially parsing a CoverParenthesizedExpressionAndArrowParameterList or CoverCallExpressionAndAsyncArrowHead.</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">PropertyDefinition : CoverInitializedName</span></span>
+<span class="line"><span style="color:#e1e4e8;">    I* t is a Syntax Error if any source text is matched by this production.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">13.2.5 Object Initializer</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">ObjectLiteral[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ...</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">PropertyDefinition[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    CoverInitializedName[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Note 3: In certain contexts, ObjectLiteral is used as a cover grammar for a more restricted secondary grammar.</span></span>
+<span class="line"><span style="color:#24292e;">The CoverInitializedName production is necessary to fully cover these secondary grammars. However, use of this production results in an early Syntax Error in normal contexts where an actual ObjectLiteral is expected.</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">13.2.5.1 Static Semantics: Early Errors</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">In addition to describing an actual object initializer the ObjectLiteral productions are also used as a cover grammar for ObjectAssignmentPattern and may be recognized as part of a CoverParenthesizedExpressionAndArrowParameterList. When ObjectLiteral appears in a context where ObjectAssignmentPattern is required the following Early Error rules are not applied. In addition, they are not applied when initially parsing a CoverParenthesizedExpressionAndArrowParameterList or CoverCallExpressionAndAsyncArrowHead.</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">PropertyDefinition : CoverInitializedName</span></span>
+<span class="line"><span style="color:#24292e;">    I* t is a Syntax Error if any source text is matched by this production.</span></span></code></pre></div><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">13.15.1 Static Semantics: Early Errors</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">AssignmentExpression : LeftHandSideExpression = AssignmentExpression</span></span>
+<span class="line"><span style="color:#e1e4e8;">If LeftHandSideExpression is an ObjectLiteral or an ArrayLiteral, the following Early Error rules are applied:</span></span>
+<span class="line"><span style="color:#e1e4e8;">    * LeftHandSideExpression must cover an AssignmentPattern.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">13.15.1 Static Semantics: Early Errors</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">AssignmentExpression : LeftHandSideExpression = AssignmentExpression</span></span>
+<span class="line"><span style="color:#24292e;">If LeftHandSideExpression is an ObjectLiteral or an ArrayLiteral, the following Early Error rules are applied:</span></span>
+<span class="line"><span style="color:#24292e;">    * LeftHandSideExpression must cover an AssignmentPattern.</span></span></code></pre></div><p>These definitions define:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">({ prop </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> value } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> {}); </span><span style="color:#6A737D;">// ObjectAssignmentPattern</span></span>
+<span class="line"><span style="color:#E1E4E8;">({ prop </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> value }); </span><span style="color:#6A737D;">// ObjectLiteral with SyntaxError</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">({ prop </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> value } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> {}); </span><span style="color:#6A737D;">// ObjectAssignmentPattern</span></span>
+<span class="line"><span style="color:#24292E;">({ prop </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> value }); </span><span style="color:#6A737D;">// ObjectLiteral with SyntaxError</span></span></code></pre></div><p>Parsers need to parse <code>ObjectLiteral</code> with <code>CoverInitializedName</code>, and throw the syntax error if it does not reach <code>=</code> for <code>ObjectAssignmentPattern</code>.</p><p>As an exercise, which one of the following <code>=</code> should throw a syntax error?</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> }</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> }</span></span></code></pre></div>`,164),p=[l];function t(r,c,i,d,y,E){return a(),n("div",null,p)}const g=s(o,[["render",t]]);export{u as __pageData,g as default};
diff --git a/assets/ja_docs_learn_ecmascript_grammar.md.53196869.lean.js b/assets/ja_docs_learn_ecmascript_grammar.md.53196869.lean.js
new file mode 100644
index 0000000000..f9fc1911dd
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@@ -0,0 +1 @@
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Grammar","description":"","frontmatter":{"title":"Grammar","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/ecmascript/grammar.md","filePath":"ja/docs/learn/ecmascript/grammar.md","lastUpdated":1701053760000}'),o={name:"ja/docs/learn/ecmascript/grammar.md"},l=e("",164),p=[l];function t(r,c,i,d,y,E){return a(),n("div",null,p)}const g=s(o,[["render",t]]);export{u as __pageData,g as default};
diff --git a/assets/ja_docs_learn_ecmascript_spec.md.550d6650.js b/assets/ja_docs_learn_ecmascript_spec.md.550d6650.js
new file mode 100644
index 0000000000..a5d9c8a2ca
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+++ b/assets/ja_docs_learn_ecmascript_spec.md.550d6650.js
@@ -0,0 +1,57 @@
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Specification","description":"","frontmatter":{"title":"Specification","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/ecmascript/spec.md","filePath":"ja/docs/learn/ecmascript/spec.md","lastUpdated":1701053760000}'),l={name:"ja/docs/learn/ecmascript/spec.md"},o=e(`<p><a href="https://tc39.es/ecma262/" target="_blank" rel="noreferrer">The ECMAScript® 2023 Language Specification</a> details everything about the JavaScript language, so anyone can implement their own JavaScript engine.</p><p>The following chapters need to be studied for our parser:</p><ul><li>Chapter 5: Notational Conventions</li><li>Chapter 11: ECMAScript Language: Source Text</li><li>Chapter 12: ECMAScript Language: Lexical Grammar</li><li>Chapter 13 - 16: Expressions, Statements, Functions, Classes, Scripts and Modules</li><li>Annex B: Additional ECMAScript Features for Web Browsers</li><li>Annex C: The Strict Mode of ECMAScript</li></ul><p>For navigation inside the specification:</p><ul><li>Anything clickable has a permanent link, they are shown on the URL as anchors, for example <code>#sec-identifiers</code></li><li>Hovering over things may show a tooltip, clicking on <code>References</code> shows all its references</li></ul><h2 id="notational-conventions" tabindex="-1">Notational Conventions <a class="header-anchor" href="#notational-conventions" aria-label="Permalink to &quot;Notational Conventions&quot;">​</a></h2><p><a href="https://tc39.es/ecma262/#sec-grammar-notation" target="_blank" rel="noreferrer">Chapter 5.1.5 Grammar Notation</a> is the section we need to read.</p><p>The things to note here are:</p><h3 id="recursion" tabindex="-1">Recursion <a class="header-anchor" href="#recursion" aria-label="Permalink to &quot;Recursion&quot;">​</a></h3><p>This is how lists are presented in the grammar.</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ArgumentList :</span></span>
+<span class="line"><span style="color:#e1e4e8;">  AssignmentExpression</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ArgumentList , AssignmentExpression</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ArgumentList :</span></span>
+<span class="line"><span style="color:#24292e;">  AssignmentExpression</span></span>
+<span class="line"><span style="color:#24292e;">  ArgumentList , AssignmentExpression</span></span></code></pre></div><p>means</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">a, b </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, c </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">2</span></span>
+<span class="line"><span style="color:#F97583;">^</span><span style="color:#E1E4E8;">_____________</span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;"> ArgumentList</span></span>
+<span class="line"><span style="color:#E1E4E8;">   </span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;">__________</span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;"> ArgumentList, AssignmentExpression,</span></span>
+<span class="line"><span style="color:#E1E4E8;">          </span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;">___</span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;"> AssignmentExpression</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">a, b </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, c </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">2</span></span>
+<span class="line"><span style="color:#D73A49;">^</span><span style="color:#24292E;">_____________</span><span style="color:#D73A49;">^</span><span style="color:#24292E;"> ArgumentList</span></span>
+<span class="line"><span style="color:#24292E;">   </span><span style="color:#D73A49;">^</span><span style="color:#24292E;">__________</span><span style="color:#D73A49;">^</span><span style="color:#24292E;"> ArgumentList, AssignmentExpression,</span></span>
+<span class="line"><span style="color:#24292E;">          </span><span style="color:#D73A49;">^</span><span style="color:#24292E;">___</span><span style="color:#D73A49;">^</span><span style="color:#24292E;"> AssignmentExpression</span></span></code></pre></div><h3 id="optional" tabindex="-1">Optional <a class="header-anchor" href="#optional" aria-label="Permalink to &quot;Optional&quot;">​</a></h3><p>The <code>_opt_</code> suffix for optional syntax. For example,</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">VariableDeclaration :</span></span>
+<span class="line"><span style="color:#e1e4e8;">  BindingIdentifier Initializer_opt</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">VariableDeclaration :</span></span>
+<span class="line"><span style="color:#24292e;">  BindingIdentifier Initializer_opt</span></span></code></pre></div><p>means</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> binding_identifier;</span></span>
+<span class="line"><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> binding_identifier </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> Initializer;</span></span>
+<span class="line"><span style="color:#E1E4E8;">                       ______________ Initializer_opt</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">var</span><span style="color:#24292E;"> binding_identifier;</span></span>
+<span class="line"><span style="color:#D73A49;">var</span><span style="color:#24292E;"> binding_identifier </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> Initializer;</span></span>
+<span class="line"><span style="color:#24292E;">                       ______________ Initializer_opt</span></span></code></pre></div><h3 id="parameters" tabindex="-1">Parameters <a class="header-anchor" href="#parameters" aria-label="Permalink to &quot;Parameters&quot;">​</a></h3><p>The <code>[Return]</code> and <code>[In]</code> are parameters of the grammar.</p><p>For example</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ScriptBody :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    StatementList[~Yield, ~Await, ~Return]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ScriptBody :</span></span>
+<span class="line"><span style="color:#24292e;">    StatementList[~Yield, ~Await, ~Return]</span></span></code></pre></div><p>means top-level yield, await and return are not allowed in scripts, but</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ModuleItem :</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ImportDeclaration</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ExportDeclaration</span></span>
+<span class="line"><span style="color:#e1e4e8;">  StatementListItem[~Yield, +Await, ~Return]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ModuleItem :</span></span>
+<span class="line"><span style="color:#24292e;">  ImportDeclaration</span></span>
+<span class="line"><span style="color:#24292e;">  ExportDeclaration</span></span>
+<span class="line"><span style="color:#24292e;">  StatementListItem[~Yield, +Await, ~Return]</span></span></code></pre></div><p>allows for top-level await.</p><h2 id="source-text" tabindex="-1">Source Text <a class="header-anchor" href="#source-text" aria-label="Permalink to &quot;Source Text&quot;">​</a></h2><p><a href="https://tc39.es/ecma262/#sec-types-of-source-code" target="_blank" rel="noreferrer">Chapter 11.2 Types of Source Code</a> tells us that there is a huge distinction between script code and module code. And there is a <code>use strict</code> mode that makes the grammar saner by disallowing old JavaScript behaviors.</p><p><strong>Script Code</strong> is not strict, <code>use strict</code> need to be inserted at the top of the file to make script code strict. In html we write <code>&lt;script src=&quot;javascript.js&quot;&gt;&lt;/script&gt;</code>.</p><p><strong>Module Code</strong> is automatically strict. In html we write <code>&lt;script type=&quot;module&quot; src=&quot;main.mjs&quot;&gt;&lt;/script&gt;</code>.</p><h2 id="ecmascript-language-lexical-grammar" tabindex="-1">ECMAScript Language: Lexical Grammar <a class="header-anchor" href="#ecmascript-language-lexical-grammar" aria-label="Permalink to &quot;ECMAScript Language: Lexical Grammar&quot;">​</a></h2><p>For more in-depth explanation, read the V8 blog on <a href="https://v8.dev/blog/understanding-ecmascript-part-3" target="_blank" rel="noreferrer">Understanding the ECMAScript spec</a>.</p><h3 id="automatic-semicolon-insertion" tabindex="-1"><a href="https://tc39.es/ecma262/#sec-automatic-semicolon-insertion" target="_blank" rel="noreferrer">Automatic Semicolon Insertion</a> <a class="header-anchor" href="#automatic-semicolon-insertion" aria-label="Permalink to &quot;[Automatic Semicolon Insertion](https://tc39.es/ecma262/#sec-automatic-semicolon-insertion)&quot;">​</a></h3><p>This section describes all the rules where we can omit a semicolon while writing JavaScript. All the explanation boils down to</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">asi</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Result</span><span style="color:#E1E4E8;">&lt;()&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">eat</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">Kind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">Semicolon</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">can_insert_semicolon</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">            </span><span style="color:#F97583;">return</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Ok</span><span style="color:#E1E4E8;">(());</span></span>
+<span class="line"><span style="color:#E1E4E8;">        }</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> range </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">prev_node_end</span><span style="color:#F97583;">..</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">cur_token</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">start;</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">Err</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">SyntaxError</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">AutoSemicolonInsertion</span><span style="color:#E1E4E8;">(range</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">into</span><span style="color:#E1E4E8;">()))</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">const</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">can_insert_semicolon</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bool</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">cur_token</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">is_on_new_line </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">matches!</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">cur_kind</span><span style="color:#E1E4E8;">(), </span><span style="color:#B392F0;">Kind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">RCurly</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">|</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Kind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">Eof</span><span style="color:#E1E4E8;">)</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">asi</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Result</span><span style="color:#24292E;">&lt;()&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">eat</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">Kind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">Semicolon</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">can_insert_semicolon</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">            </span><span style="color:#D73A49;">return</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Ok</span><span style="color:#24292E;">(());</span></span>
+<span class="line"><span style="color:#24292E;">        }</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> range </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">prev_node_end</span><span style="color:#D73A49;">..</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">cur_token</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">start;</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Err</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">SyntaxError</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">AutoSemicolonInsertion</span><span style="color:#24292E;">(range</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">into</span><span style="color:#24292E;">()))</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">const</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">can_insert_semicolon</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#005CC5;">self</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bool</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">cur_token</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">is_on_new_line </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">matches!</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">cur_kind</span><span style="color:#24292E;">(), </span><span style="color:#6F42C1;">Kind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">RCurly</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">|</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Kind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">Eof</span><span style="color:#24292E;">)</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span></code></pre></div><p>The <code>asi</code> function need to be manually called where applicable, for example in the end of statement:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">parse_debugger_statement</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Result</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> node </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">start_node</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">expect</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">Kind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">Debugger</span><span style="color:#E1E4E8;">)</span><span style="color:#F97583;">?</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#6A737D;">        // highlight-next-line</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">asi</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">?</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">ast</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">debugger_statement</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">finish_node</span><span style="color:#E1E4E8;">(node))</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">parse_debugger_statement</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Result</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> node </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">start_node</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">expect</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">Kind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">Debugger</span><span style="color:#24292E;">)</span><span style="color:#D73A49;">?</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#6A737D;">        // highlight-next-line</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">asi</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">?</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">ast</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">debugger_statement</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">finish_node</span><span style="color:#24292E;">(node))</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span></code></pre></div><div class="info custom-block"><p class="custom-block-title">INFO</p><p>This section on asi is written with a parser in mind, it explicitly states that the source text is parsed from left to right, which makes it almost impossible to write the parser in any other way. The author of jsparagus made a rant about this <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md#automatic-semicolon-insertion-" target="_blank" rel="noreferrer">here</a>.</p><blockquote><p>The specification for this feature is both very-high-level and weirdly procedural (“When, as the source text is parsed from left to right, a token is encountered...”, as if the specification is telling a story about a browser. As far as I know, this is the only place in the spec where anything is assumed or implied about the internal implementation details of parsing.) But it would be hard to specify ASI any other way.</p></blockquote></div><h2 id="expressions-statements-functions-classes-scripts-and-modules" tabindex="-1">Expressions, Statements, Functions, Classes, Scripts and Modules <a class="header-anchor" href="#expressions-statements-functions-classes-scripts-and-modules" aria-label="Permalink to &quot;Expressions, Statements, Functions, Classes, Scripts and Modules&quot;">​</a></h2><p>It takes a while to understand the syntactic grammar, then apply them to writing a parser.</p>`,39),p=[o];function t(r,c,i,y,E,d){return a(),n("div",null,p)}const m=s(l,[["render",t]]);export{u as __pageData,m as default};
diff --git a/assets/ja_docs_learn_ecmascript_spec.md.550d6650.lean.js b/assets/ja_docs_learn_ecmascript_spec.md.550d6650.lean.js
new file mode 100644
index 0000000000..25adc0be67
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+++ b/assets/ja_docs_learn_ecmascript_spec.md.550d6650.lean.js
@@ -0,0 +1 @@
+import{_ as s,o as a,c as n,Q as e}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"Specification","description":"","frontmatter":{"title":"Specification","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/ecmascript/spec.md","filePath":"ja/docs/learn/ecmascript/spec.md","lastUpdated":1701053760000}'),l={name:"ja/docs/learn/ecmascript/spec.md"},o=e("",39),p=[o];function t(r,c,i,y,E,d){return a(),n("div",null,p)}const m=s(l,[["render",t]]);export{u as __pageData,m as default};
diff --git a/assets/ja_docs_learn_ecosystem.md.c9d3c686.js b/assets/ja_docs_learn_ecosystem.md.c9d3c686.js
new file mode 100644
index 0000000000..adaf5ef1a6
--- /dev/null
+++ b/assets/ja_docs_learn_ecosystem.md.c9d3c686.js
@@ -0,0 +1 @@
+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const _=JSON.parse('{"title":"Ecosystem","description":"","frontmatter":{"title":"Ecosystem","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/ecosystem.md","filePath":"ja/docs/learn/ecosystem.md","lastUpdated":1701053760000}'),o={name:"ja/docs/learn/ecosystem.md"},n=r('<p>Contributing to oxc will benefit the whole frontend development community. It would be a great pleasure if you could join as well.</p><p>We are being integrated into:</p><h2 id="rspack" tabindex="-1"><a href="https://www.rspack.dev" target="_blank" rel="noreferrer">Rspack</a> <a class="header-anchor" href="#rspack" aria-label="Permalink to &quot;[Rspack](https://www.rspack.dev)&quot;">​</a></h2><p>A fast Rust-based web bundler.</p><h2 id="rolldown" tabindex="-1">Rolldown <a class="header-anchor" href="#rolldown" aria-label="Permalink to &quot;Rolldown&quot;">​</a></h2><p>To be announced.</p><h2 id="ezno-type-checker" tabindex="-1"><a href="https://github.com/kaleidawave/ezno" target="_blank" rel="noreferrer">Ezno Type Checker</a> <a class="header-anchor" href="#ezno-type-checker" aria-label="Permalink to &quot;[Ezno Type Checker](https://github.com/kaleidawave/ezno)&quot;">​</a></h2><p>A JavaScript compiler and TypeScript checker written in Rust with a focus on static analysis and runtime performance.</p><h2 id="tyvm" tabindex="-1"><a href="https://github.com/zackradisic/tyvm" target="_blank" rel="noreferrer">Tyvm</a> <a class="header-anchor" href="#tyvm" aria-label="Permalink to &quot;[Tyvm](https://github.com/zackradisic/tyvm)&quot;">​</a></h2><p>An experimental bytecode interpreter for type-level Typescript.</p>',10),c=[n];function s(i,l,p,d,h,m){return a(),t("div",null,c)}const f=e(o,[["render",s]]);export{_ as __pageData,f as default};
diff --git a/assets/ja_docs_learn_ecosystem.md.c9d3c686.lean.js b/assets/ja_docs_learn_ecosystem.md.c9d3c686.lean.js
new file mode 100644
index 0000000000..47e30ce5c0
--- /dev/null
+++ b/assets/ja_docs_learn_ecosystem.md.c9d3c686.lean.js
@@ -0,0 +1 @@
+import{_ as e,o as a,c as t,Q as r}from"./chunks/framework.725e5b03.js";const _=JSON.parse('{"title":"Ecosystem","description":"","frontmatter":{"title":"Ecosystem","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/ecosystem.md","filePath":"ja/docs/learn/ecosystem.md","lastUpdated":1701053760000}'),o={name:"ja/docs/learn/ecosystem.md"},n=r("",10),c=[n];function s(i,l,p,d,h,m){return a(),t("div",null,c)}const f=e(o,[["render",s]]);export{_ as __pageData,f as default};
diff --git a/assets/ja_docs_learn_performance.md.239666b7.js b/assets/ja_docs_learn_performance.md.239666b7.js
new file mode 100644
index 0000000000..356848b914
--- /dev/null
+++ b/assets/ja_docs_learn_performance.md.239666b7.js
@@ -0,0 +1,469 @@
+import{_ as s,o as a,c as n,Q as l}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/performance.md","filePath":"ja/docs/learn/performance.md","lastUpdated":1701053760000}'),p={name:"ja/docs/learn/performance.md"},o=l(`<h1 id="pursuit-of-performance-on-building-a-javascript-compiler" tabindex="-1">Pursuit of Performance on Building a JavaScript Compiler <a class="header-anchor" href="#pursuit-of-performance-on-building-a-javascript-compiler" aria-label="Permalink to &quot;Pursuit of Performance on Building a JavaScript Compiler&quot;">​</a></h1><p>Originally posted on <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">https://rustmagazine.org/issue-3/javascript-compiler/</a></p><h2 id="on-performance" tabindex="-1">On Performance <a class="header-anchor" href="#on-performance" aria-label="Permalink to &quot;On Performance&quot;">​</a></h2><p>After two years of writing Rust, performance has become an ingrained discipline for me - it boils down to <strong>allocate less memory</strong> and <strong>use fewer CPU cycles</strong>.</p><p>However, achieving optimal performance can be difficult without the knowledge of the problem domain or awareness of potential solutions.</p><p>I will take you on my journey of performance and optimization in the following sections. My preferred method of learning is through a combination of research, trial, and error, so the following sections will be organized as such.</p><h1 id="parsing" tabindex="-1">Parsing <a class="header-anchor" href="#parsing" aria-label="Permalink to &quot;Parsing&quot;">​</a></h1><p>Oxc is a standard compiler that includes an abstract syntax tree (AST), a lexer, and a recursive descent parser.</p><h2 id="abstract-syntax-tree-ast" tabindex="-1">Abstract Syntax Tree (AST) <a class="header-anchor" href="#abstract-syntax-tree-ast" aria-label="Permalink to &quot;Abstract Syntax Tree (AST)&quot;">​</a></h2><p>The first architectural design for a compiler is its AST.</p><p>All JavaScript tools work on the AST level, for example:</p><ul><li>A linter (e.g. ESLint) checks the AST for errors</li><li>A formatter (e.g.prettier) prints the AST back to JavaScript text</li><li>A minifier (e.g. terser) transforms the AST</li><li>A bundler connects all import and export statements between ASTs from different files</li></ul><p>It will be painful to build these tools if the AST is not user-friendly.</p><p>For JavaScript, the most used AST specification is <a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a>. My first AST version replicates estree:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Program</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> body</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">VariableDeclarationStatement</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">VariableDeclaration</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">VariableDeclaration</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> declarations</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">VariableDeclarator</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Program</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> body</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">VariableDeclarationStatement</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">VariableDeclaration</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">VariableDeclaration</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> declarations</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">VariableDeclarator</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>In Rust, declaring a tree is relatively straightforward, as it involves using structs and enums.</p><h3 id="memory-allocation" tabindex="-1">Memory Allocation <a class="header-anchor" href="#memory-allocation" aria-label="Permalink to &quot;Memory Allocation&quot;">​</a></h3><p>I worked on this version of AST for a couple of months while writing the parser. And one day I decided to profile it. The profiler showed the program was spending a lot of time calling <code>drop</code>.</p><p>💡 Nodes of the AST are allocated on the heap via <code>Box</code> or <code>Vec</code>, they are allocated individually so they are dropped in sequential order.</p><p>Is there a solution to mitigate this?</p><p>So while working on the parser I studied some of the other JavaScript parsers written in Rust, mainly <a href="https://github.com/ratel-rust/ratel-core" target="_blank" rel="noreferrer">ratel</a> and <a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a>.</p><p>Both of these parsers declare their AST with a lifetime annotation,</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">ast</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Expression</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">ExpressionNode</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">ast</span><span style="color:#E1E4E8;">&gt;),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">ast</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Expression</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">ExpressionNode</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">ast</span><span style="color:#24292E;">&gt;),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>and they have an accompanying file called <code>arena.rs</code>.</p><p>I did not understand what it does so I neglected them until I started reading about their usage of memory arenas: <a href="https://docs.rs/bumpalo/latest/bumpalo/" target="_blank" rel="noreferrer">bumpalo</a> and <a href="https://docs.rs/toolshed/latest/toolshed/struct.Arena.html" target="_blank" rel="noreferrer">toolshed</a>.</p><p>In summary, memory arena allocates memory upfront in chunks or pages and deallocate altogether when the arena is dropped. The AST is allocated on the arena so dropping the AST is a fast operation.</p><p>Another nice side effect that comes with this is that, the AST is constructed in a specific order, and tree traversal also follows the same order, resulting in linear memory access during the visitation process. This access pattern will be efficient since all nearby memory will be read into the CPU cache in pages, resulting in faster access times.</p><p>Unfortunately it can be challenging for Rust beginners to use memory arenas because all data structures and relevant functions need to be parameterized by lifetime annotations. It took me five attempts to allocate the AST inside <code>bumpalo</code>.</p><p>Changing to a memory arena for the AST resulted around 20% performance improvement.</p><h3 id="enum-sizes" tabindex="-1">Enum Sizes <a class="header-anchor" href="#enum-sizes" aria-label="Permalink to &quot;Enum Sizes&quot;">​</a></h3><p>Due to the recursive nature of ASTs, we need to define the types in a way to avoid the &quot;recursive without indirection&quot; error:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">error[E0072]: recursive types \`Enum\` and \`Variant\` have infinite size</span></span>
+<span class="line"><span style="color:#e1e4e8;"> --&gt; crates/oxc_linter/src/lib.rs:1:1</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |</span></span>
+<span class="line"><span style="color:#e1e4e8;">1 | enum Enum {</span></span>
+<span class="line"><span style="color:#e1e4e8;">  | ^^^^^^^^^</span></span>
+<span class="line"><span style="color:#e1e4e8;">2 |     Variant(Variant),</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |             ------- recursive without indirection</span></span>
+<span class="line"><span style="color:#e1e4e8;">3 | }</span></span>
+<span class="line"><span style="color:#e1e4e8;">4 | struct Variant {</span></span>
+<span class="line"><span style="color:#e1e4e8;">  | ^^^^^^^^^^^^^^</span></span>
+<span class="line"><span style="color:#e1e4e8;">5 |     field: Enum,</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |            ---- recursive without indirection</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |</span></span>
+<span class="line"><span style="color:#e1e4e8;">help: insert some indirection (e.g., a \`Box\`, \`Rc\`, or \`&amp;\`) to break the cycle</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |</span></span>
+<span class="line"><span style="color:#e1e4e8;">2 ~     Variant(Box&lt;Variant&gt;),</span></span>
+<span class="line"><span style="color:#e1e4e8;">3 | }</span></span>
+<span class="line"><span style="color:#e1e4e8;">4 | struct Variant {</span></span>
+<span class="line"><span style="color:#e1e4e8;">5 ~     field: Box&lt;Enum&gt;,</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">error[E0072]: recursive types \`Enum\` and \`Variant\` have infinite size</span></span>
+<span class="line"><span style="color:#24292e;"> --&gt; crates/oxc_linter/src/lib.rs:1:1</span></span>
+<span class="line"><span style="color:#24292e;">  |</span></span>
+<span class="line"><span style="color:#24292e;">1 | enum Enum {</span></span>
+<span class="line"><span style="color:#24292e;">  | ^^^^^^^^^</span></span>
+<span class="line"><span style="color:#24292e;">2 |     Variant(Variant),</span></span>
+<span class="line"><span style="color:#24292e;">  |             ------- recursive without indirection</span></span>
+<span class="line"><span style="color:#24292e;">3 | }</span></span>
+<span class="line"><span style="color:#24292e;">4 | struct Variant {</span></span>
+<span class="line"><span style="color:#24292e;">  | ^^^^^^^^^^^^^^</span></span>
+<span class="line"><span style="color:#24292e;">5 |     field: Enum,</span></span>
+<span class="line"><span style="color:#24292e;">  |            ---- recursive without indirection</span></span>
+<span class="line"><span style="color:#24292e;">  |</span></span>
+<span class="line"><span style="color:#24292e;">help: insert some indirection (e.g., a \`Box\`, \`Rc\`, or \`&amp;\`) to break the cycle</span></span>
+<span class="line"><span style="color:#24292e;">  |</span></span>
+<span class="line"><span style="color:#24292e;">2 ~     Variant(Box&lt;Variant&gt;),</span></span>
+<span class="line"><span style="color:#24292e;">3 | }</span></span>
+<span class="line"><span style="color:#24292e;">4 | struct Variant {</span></span>
+<span class="line"><span style="color:#24292e;">5 ~     field: Box&lt;Enum&gt;,</span></span></code></pre></div><p>There are two ways to do this. Either box the enum in the enum variant or box the struct field.</p><p>I found the same question in the Rust forum back in 2017, <a href="https://users.rust-lang.org/t/is-there-a-better-way-to-represent-an-abstract-syntax-tree/9549/4" target="_blank" rel="noreferrer">Is there a better way to represent an abstract syntax tree?</a></p><p>Aleksey (matklad) told us to box the enum variants to keep the <code>Expression</code> enum small. But what does this mean?</p><p>As it turns out, the memory layout of a Rust enum is dependent on the sizes of all its variants, its total byte size dependents on the largest variant. For example, the following enum will take up 56 bytes (1 byte for the tag, 48 bytes for the payload, and 8 bytes for alignment).</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Enum</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">A</span><span style="color:#E1E4E8;">,</span><span style="color:#6A737D;"> // 0 byte payload</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">B</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">),</span><span style="color:#6A737D;"> // 24 byte payload</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">C</span><span style="color:#E1E4E8;"> { first</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">, last</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;"> },</span><span style="color:#6A737D;"> // 48 byte payload</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Enum</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">A</span><span style="color:#24292E;">,</span><span style="color:#6A737D;"> // 0 byte payload</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">B</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">),</span><span style="color:#6A737D;"> // 24 byte payload</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">C</span><span style="color:#24292E;"> { first</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">, last</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;"> },</span><span style="color:#6A737D;"> // 48 byte payload</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>In a typical JavaScript AST, the <code>Expression</code> enum holds 45 variants and the <code>Statement</code> enum holds 20 variants. They take up more than 200 bytes if not boxed by enum variants. These 200 bytes have to be passed around, and also accessed every time we do a <code>matches!(expr, Expression::Variant(_))</code> check, which is not very cache friendly for performance.</p><p>So to make memory access efficient, it is best to box the enum variants.</p><p>The <a href="https://nnethercote.github.io/perf-book/type-sizes.html" target="_blank" rel="noreferrer">perf-book</a> describes additional info on how to find large types.</p><p>I also copied the test for restricting small enum sizes.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">#[cfg(all(target_arch </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;x86_64&quot;</span><span style="color:#E1E4E8;">, target_pointer_width </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;64&quot;</span><span style="color:#E1E4E8;">))]</span></span>
+<span class="line"><span style="color:#E1E4E8;">#[test]</span></span>
+<span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">no_bloat_enum_sizes</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">mem</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">size_of;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">crate::</span><span style="color:#B392F0;">ast</span><span style="color:#F97583;">::*</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">assert_eq!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&gt;(), </span><span style="color:#79B8FF;">16</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">assert_eq!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Expression</span><span style="color:#E1E4E8;">&gt;(), </span><span style="color:#79B8FF;">16</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">assert_eq!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Declaration</span><span style="color:#E1E4E8;">&gt;(), </span><span style="color:#79B8FF;">16</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">#[cfg(all(target_arch </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;x86_64&quot;</span><span style="color:#24292E;">, target_pointer_width </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;64&quot;</span><span style="color:#24292E;">))]</span></span>
+<span class="line"><span style="color:#24292E;">#[test]</span></span>
+<span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">no_bloat_enum_sizes</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">mem</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">size_of;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">crate::</span><span style="color:#6F42C1;">ast</span><span style="color:#D73A49;">::*</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">assert_eq!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;">&gt;(), </span><span style="color:#005CC5;">16</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">assert_eq!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Expression</span><span style="color:#24292E;">&gt;(), </span><span style="color:#005CC5;">16</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">assert_eq!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Declaration</span><span style="color:#24292E;">&gt;(), </span><span style="color:#005CC5;">16</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>Boxing the enum variants resulted around 10% speed-up.</p><h3 id="span" tabindex="-1">Span <a class="header-anchor" href="#span" aria-label="Permalink to &quot;Span&quot;">​</a></h3><p>Occasionally, we may not realize that a smaller memory footprint is possible until we spend some extra time examining the data structures.</p><p>In this instance, the leaf of all AST nodes contains a small data structure called the &quot;span&quot;, which is used for storing the byte offset from the source text and comprises two <code>usize</code>s.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> start</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> end</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> start</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> end</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>It was <a href="https://github.com/Boshen/oxc/pull/4#pullrequestreview-1294538874" target="_blank" rel="noreferrer">pointed out to me</a> that I can safely change <code>usize</code> to <code>u32</code> to reduce peak memory because larger than <code>u32</code> is a 4GB file.</p><p>Changing to <code>u32</code> improved the performance <a href="https://github.com/Boshen/oxc/pull/31" target="_blank" rel="noreferrer">up to 5% performance on large files</a>.</p><h3 id="strings-and-identifiers" tabindex="-1">Strings and Identifiers <a class="header-anchor" href="#strings-and-identifiers" aria-label="Permalink to &quot;Strings and Identifiers&quot;">​</a></h3><p>Inside the AST, one may attempt to use a string reference to the source text for identifier names and string literals.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">StringLiteral</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> value</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Identifier</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> name</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">StringLiteral</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> value</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Identifier</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> name</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>But unfortunately in JavaScript, strings and identifiers can have <a href="https://mathiasbynens.be/notes/javascript-escapes" target="_blank" rel="noreferrer">escape sequences</a>, i.e. <code>&#39;\\251&#39;</code>, <code>&#39;\\xA9&#39;</code> and <code>&#39;©&#39;</code> are the same for the copyright symbol.</p><p>This implies that we must compute the escaped values and allocate a new <code>String</code>.</p><h3 id="string-interning" tabindex="-1">String interning <a class="header-anchor" href="#string-interning" aria-label="Permalink to &quot;String interning&quot;">​</a></h3><p>When there are lots of heap-allocated strings, a technique called <a href="https://en.wikipedia.org/wiki/String_interning" target="_blank" rel="noreferrer">string interning</a> can be used to reduce total memory by storing only one copy of each distinct string value.</p><p><a href="https://crates.io/crates/string_cache" target="_blank" rel="noreferrer">string-cache</a> is a popular and widely used library published by the servo team. Initially, I used the <code>string-cache</code> library for identifiers and strings in the AST. The performance of the parser was fast in a single thread, but when I started implementing the linter where there are multiples parser running parallel with rayon, CPU utilization was at about 50% of all cores.</p><p>Upon profiling, a method called <code>parking_lot::raw_mutex::RawMutex::lock_slow</code> showed up on the top of the execution time. I did not know much about locks and multi-core programming, but a global lock was just strange to start with, so I decided to remove the <code>string-cache</code> library to enable full CPU utilization.</p><p>Removing <code>string-cache</code> from the AST improved the performance of parallel parsing by about 30%.</p><h4 id="string-cache" tabindex="-1">string-cache <a class="header-anchor" href="#string-cache" aria-label="Permalink to &quot;string-cache&quot;">​</a></h4><p>Half a year later, while working on another performance-critical project, the <code>string-cache</code> library resurfaced again. It was blocking all the threads during parallel text parsing.</p><p>I decided to study what <code>string-cache</code> does because I am prepared this time after reading the book <a href="https://marabos.nl/atomics/" target="_blank" rel="noreferrer">Rust Atomics and Locks</a> by Mara Bos.</p><p>Here are the <a href="https://github.com/servo/string-cache/blob/6c044c91bb3d8212dae931152a7895f498574f71/src/dynamic_set.rs#L41-L42" target="_blank" rel="noreferrer">relevant</a><a href="https://github.com/servo/string-cache/blob/6c044c91bb3d8212dae931152a7895f498574f71/src/atom.rs#L204" target="_blank" rel="noreferrer">code</a> around the lock. Please note that the code was written eight years ago in 2015.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">crate</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">static</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">DYNAMIC_SET</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Lazy</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Mutex</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Set</span><span style="color:#E1E4E8;">&gt;&gt; </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Lazy</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Mutex</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">({</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6A737D;">// ... in another place</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> ptr</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">ptr</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">NonNull</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;">&gt; </span><span style="color:#F97583;">=</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#79B8FF;">DYNAMIC_SET</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">lock</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">insert</span><span style="color:#E1E4E8;">(string_to_add, hash</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">g);</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">crate</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">static</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">DYNAMIC_SET</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Lazy</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Mutex</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Set</span><span style="color:#24292E;">&gt;&gt; </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Lazy</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Mutex</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">({</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6A737D;">// ... in another place</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> ptr</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">ptr</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">NonNull</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;">&gt; </span><span style="color:#D73A49;">=</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#005CC5;">DYNAMIC_SET</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">lock</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">insert</span><span style="color:#24292E;">(string_to_add, hash</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">g);</span></span></code></pre></div><p>So this is straightforward. It locks the data structure <code>Set</code> every time a string is being inserted. As this routine is called frequently within a parser, its performance is impacted negatively by synchronization.</p><p>Now let&#39;s take a look at the <a href="https://github.com/servo/string-cache/blob/6c044c91bb3d8212dae931152a7895f498574f71/src/dynamic_set.rs#L53-L86" target="_blank" rel="noreferrer"><code>Set</code> data structure</a> and see what it does:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">crate</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">insert</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, string</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Cow</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">&gt;, hash</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">u32</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">NonNull</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> bucket_index </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> (hash </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">BUCKET_MASK</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">as</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">mut</span><span style="color:#E1E4E8;"> ptr</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Option</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Box</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;">&gt;&gt; </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">buckets[bucket_index]</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">as_mut</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">while</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Some</span><span style="color:#E1E4E8;">(entry) </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> ptr</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">take</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">            </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">hash </span><span style="color:#F97583;">==</span><span style="color:#E1E4E8;"> hash </span><span style="color:#F97583;">&amp;&amp;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">*</span><span style="color:#E1E4E8;">entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">string </span><span style="color:#F97583;">==</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">*</span><span style="color:#E1E4E8;">string {</span></span>
+<span class="line"><span style="color:#E1E4E8;">                </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">ref_count</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">fetch_add</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">SeqCst</span><span style="color:#E1E4E8;">) &gt; </span><span style="color:#79B8FF;">0</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">                    </span><span style="color:#F97583;">return</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">NonNull</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">from</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">**</span><span style="color:#E1E4E8;">entry);</span></span>
+<span class="line"><span style="color:#E1E4E8;">                }</span></span>
+<span class="line"><span style="color:#E1E4E8;">                entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">ref_count</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">fetch_sub</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">SeqCst</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">                </span><span style="color:#F97583;">break</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">            }</span></span>
+<span class="line"><span style="color:#E1E4E8;">            ptr </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">next_in_bucket</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">as_mut</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">        }</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">debug_assert!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">mem</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">align_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;">&gt;() </span><span style="color:#F97583;">&gt;=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">ENTRY_ALIGNMENT</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> string </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> string</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">into_owned</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">mut</span><span style="color:#E1E4E8;"> entry </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Box</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        next_in_bucket</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">buckets[bucket_index]</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">take</span><span style="color:#E1E4E8;">(),</span></span>
+<span class="line"><span style="color:#E1E4E8;">        hash,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        ref_count</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AtomicIsize</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">        string</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> string</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">into_boxed_str</span><span style="color:#E1E4E8;">(),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    });</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> ptr </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">NonNull</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">from</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">*</span><span style="color:#E1E4E8;">entry);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">buckets[bucket_index] </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Some</span><span style="color:#E1E4E8;">(entry);</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    ptr</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">crate</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">insert</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, string</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Cow</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">&gt;, hash</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">u32</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">NonNull</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> bucket_index </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> (hash </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">BUCKET_MASK</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">as</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">    {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">mut</span><span style="color:#24292E;"> ptr</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Option</span><span style="color:#24292E;">&lt;</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Box</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;">&gt;&gt; </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">buckets[bucket_index]</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">as_mut</span><span style="color:#24292E;">();</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">while</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Some</span><span style="color:#24292E;">(entry) </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> ptr</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">take</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">            </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">hash </span><span style="color:#D73A49;">==</span><span style="color:#24292E;"> hash </span><span style="color:#D73A49;">&amp;&amp;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">*</span><span style="color:#24292E;">entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">string </span><span style="color:#D73A49;">==</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">*</span><span style="color:#24292E;">string {</span></span>
+<span class="line"><span style="color:#24292E;">                </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">ref_count</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">fetch_add</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">SeqCst</span><span style="color:#24292E;">) &gt; </span><span style="color:#005CC5;">0</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">                    </span><span style="color:#D73A49;">return</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">NonNull</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">from</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">**</span><span style="color:#24292E;">entry);</span></span>
+<span class="line"><span style="color:#24292E;">                }</span></span>
+<span class="line"><span style="color:#24292E;">                entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">ref_count</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">fetch_sub</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">SeqCst</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">                </span><span style="color:#D73A49;">break</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">            }</span></span>
+<span class="line"><span style="color:#24292E;">            ptr </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">next_in_bucket</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">as_mut</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">        }</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">debug_assert!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">mem</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">align_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;">&gt;() </span><span style="color:#D73A49;">&gt;=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">ENTRY_ALIGNMENT</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> string </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> string</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">into_owned</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">mut</span><span style="color:#24292E;"> entry </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Box</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">        next_in_bucket</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">buckets[bucket_index]</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">take</span><span style="color:#24292E;">(),</span></span>
+<span class="line"><span style="color:#24292E;">        hash,</span></span>
+<span class="line"><span style="color:#24292E;">        ref_count</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AtomicIsize</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">        string</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> string</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">into_boxed_str</span><span style="color:#24292E;">(),</span></span>
+<span class="line"><span style="color:#24292E;">    });</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> ptr </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">NonNull</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">from</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">*</span><span style="color:#24292E;">entry);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">buckets[bucket_index] </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Some</span><span style="color:#24292E;">(entry);</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    ptr</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>It looks like it is looking for a bucket to store the string and it inserts the string if it is not in the bucket.</p><p>💡 Is this linear probing? If this is linear probing then this <code>Set</code> is just a <code>HashMap</code> without saying it is a <code>HashMap</code>. 💡 If this is a <code>HashMap</code>, then <code>Mutex&lt;HashMap&gt;</code> is a concurrent hashmap.</p><p>Although the solution may seem straightforward when we know what to look for, it took me a month to figure this out because I was unaware of the issue. When it became evident that this is just a concurrent hashmap, applying the Mutex to the buckets instead of the entire hashmap was a clear and logical solution. Within an hour of implementing this change, I submitted a pull request and was happy with the outcome 😃.</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">https://github.com/servo/string-cache/pull/268</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">https://github.com/servo/string-cache/pull/268</span></span></code></pre></div><p>It is worth mentioning that string interning is a battlefield within the Rust community. For the example shown in <a href="https://dev.to/cad97/string-interners-in-rust-797" target="_blank" rel="noreferrer">this blog post</a>, there are single-threaded libraries such <code>string-interner</code>, <code>lasso</code>, <code>lalrpop-intern</code>, <code>intaglio</code> and <code>strena</code>.</p><p>Since we are parsing files in parallel, an option is to utilize a multi-threaded string interner library such as <a href="https://crates.io/crates/ustr" target="_blank" rel="noreferrer"><code>ustr</code></a>. However, after profiling both <code>ustr</code> and the enhanced version of <code>string-cache</code>, it became apparent that the performance was still below expectations compared to the approach I am going to explain below.</p><p>Some preliminary guesses for the sub-par performance are:</p><ul><li>Hashing - the interners need to hash the string for deduplication</li><li>Indirection - we need to read the string value from a &quot;far away&quot; heap, which is not cache friendly</li></ul><h3 id="string-inlining" tabindex="-1">String Inlining <a class="header-anchor" href="#string-inlining" aria-label="Permalink to &quot;String Inlining&quot;">​</a></h3><p>So we are back to the initial problem of having to allocate lots of strings. Fortunately, there is a partial solution to this problem if we look at what kind of data we are dealing with: short JavaScript variable names and some short strings. There is a technique called string inlining, where we store all of the bytes of a string on the stack.</p><p>In essence, we want the following enum to store our string.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Str</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Static</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">static</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Inline</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">InlineReprensation</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Heap</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Str</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Static</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">static</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Inline</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">InlineReprensation</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Heap</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>To minimize the size of the enum, <code>InlineRepresentation</code> should have the same size as <code>String</code>.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">#[cfg(all(target_arch </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;x86_64&quot;</span><span style="color:#E1E4E8;">, target_pointer_width </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;64&quot;</span><span style="color:#E1E4E8;">))]</span></span>
+<span class="line"><span style="color:#E1E4E8;">#[test]</span></span>
+<span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">test_size</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">mem</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">size_of;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">assert_eq!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">&gt;(), </span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">InlineReprensation</span><span style="color:#E1E4E8;">&gt;());</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">#[cfg(all(target_arch </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;x86_64&quot;</span><span style="color:#24292E;">, target_pointer_width </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;64&quot;</span><span style="color:#24292E;">))]</span></span>
+<span class="line"><span style="color:#24292E;">#[test]</span></span>
+<span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">test_size</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">mem</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">size_of;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">assert_eq!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">&gt;(), </span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">InlineReprensation</span><span style="color:#24292E;">&gt;());</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>Many crates in the Rust community aim to optimize memory usage. This is yet another battlefield within the community. The most popular ones are</p><ul><li><a href="https://crates.io/crates/smol_str" target="_blank" rel="noreferrer">smol_str</a></li><li><a href="https://crates.io/crates/smartstring" target="_blank" rel="noreferrer">smartstring</a></li><li><a href="https://crates.io/crates/compact_str" target="_blank" rel="noreferrer">compact_str</a></li><li><a href="https://crates.io/crates/flexstr" target="_blank" rel="noreferrer">flexstr</a></li></ul><p>Each of these crates have unique characteristics and approaches to achieving memory optimization, leading to a variety of trade-offs and considerations when choosing which one to use. For example <code>smol_str</code> and <code>flexstr</code> clones are O(1). <code>flexstr</code> can store 22 bytes, <code>smol_str</code> and <code>smartstring</code> can store 23 bytes, and <code>compact_str</code> can store 24 bytes on 64-bit systems.</p><p><a href="https://fasterthanli.me" target="_blank" rel="noreferrer">https://fasterthanli.me</a> has a <a href="https://fasterthanli.me/articles/small-strings-in-rust" target="_blank" rel="noreferrer">deep dive</a> on this topic.</p><p>Changing <code>String</code> to <code>compact_str::CompactStr</code> reduced memory allocations by a large amount.</p><h2 id="lexer" tabindex="-1">Lexer <a class="header-anchor" href="#lexer" aria-label="Permalink to &quot;Lexer&quot;">​</a></h2><h3 id="token" tabindex="-1">Token <a class="header-anchor" href="#token" aria-label="Permalink to &quot;Token&quot;">​</a></h3><p>The job of the lexer (also known as tokenizer) is to turn source text into structured data called a token.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Token</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Kind</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Token</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Kind</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>To make it easier to work with, a token kind is typically defined as an enum in Rust. The variants of the enums hold the corresponding data for each token.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Kind</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">    // Keywords</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">For</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">While</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">...</span></span>
+<span class="line"><span style="color:#6A737D;">    // Literals</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Num</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">f64</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">...</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Kind</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">    // Keywords</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">For</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">While</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">...</span></span>
+<span class="line"><span style="color:#6A737D;">    // Literals</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Num</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">f64</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">...</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>This enum currently uses 32 bytes, and a lexer often need to construct millions of this token <code>Kind</code>. Every time it constructs a <code>Kind::For</code> or <code>Kind::While</code>, it has to allocate 32 bytes of memory on the stack.</p><p>A clever way to improve this is to break up the enum variant to keep <code>Kind</code> to a single byte and move the values into another enum,</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Token</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Kind</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> value</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">TokenValue</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">TokenValue</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">None</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Num</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">f64</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Token</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Kind</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> value</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">TokenValue</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">TokenValue</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">None</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Num</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">f64</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>Since we control all the parsing code, it is our job to keep this safe by always declaring the corresponding token value to its kind.</p><p>While a <code>TokenValue</code> of 32 bytes is already quite small, it may still have a negative impact on performance because it is allocated frequently.</p><p>Let&#39;s take a look at the <code>String</code> type and see what we can find, by using the &quot;go-to definition&quot; in our code editors, we&#39;ll go through <code>String</code> -&gt; <code>Vec</code> -&gt; <code>RawVec</code>:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    vec</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">u8</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    buf</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">RawVec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">T</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">A</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    len</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">RawVec</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    ptr</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Unique</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">T</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    cap</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    alloc</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">A</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    vec</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">u8</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    buf</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">RawVec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">T</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">A</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">    len</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">RawVec</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    ptr</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Unique</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">T</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">    cap</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    alloc</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">A</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>As advertised, a <code>String</code> is just a <code>Vec</code> of <code>u8</code>s, and a <code>Vec</code> has a length and a capacity field. Since we are never going to mutate this string, an optimization in terms of memory usage would be to drop the cap field and use a string slice (<code>&amp;str</code>) instead.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">TokenValue</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">None</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Num</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">f64</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">TokenValue</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">None</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Num</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">f64</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p><code>TokenValue</code> becomes 24 bytes.</p><p>While using a string slice instead of String in <code>TokenValue</code> would reduce memory usage, it does come with the downside of adding a lifetime annotation. This can lead to issues with the borrow checker and the lifetime annotation will propagate to the rest of the codebase, making our code somewhat difficult to manage. I lost the borrow checking game 8 months ago but <a href="https://github.com/Boshen/oxc/pull/174" target="_blank" rel="noreferrer">finally won</a> when I revisited this.</p><p>When it makes sense, we can always go for the owned version of the immutable data instead of using references. For example <code>Box&lt;str&gt;</code> for <code>String</code> and <code>Box&lt;[u8]&gt;</code> for <code>Vec&lt;u8&gt;</code>.</p><p>In summary, we can always come up with tricks to keep our data structures small, and it will sometimes reward us performance improvement.</p><h3 id="cow" tabindex="-1">Cow <a class="header-anchor" href="#cow" aria-label="Permalink to &quot;Cow&quot;">​</a></h3><p>I first encountered the term <code>Cow</code> when I was studying jsparagus&#39;s code, it has an infrastructure called <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/212f6bdbc2cae909e7d5cfebf36284560c3c4ef4/crates/parser/src/lexer.rs#L2256" target="_blank" rel="noreferrer"><code>AutoCow</code></a>.</p><p>I vaguely understood what the code was doing. When a JavaScript string is being tokenized, it allocates a new string when it encounters an escaped sequence or it returns the original string slice if it doesn&#39;t:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">finish</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, lexer</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#B392F0;">Lexer</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">alloc</span><span style="color:#E1E4E8;">&gt;) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">alloc</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">match</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">value</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">take</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">Some</span><span style="color:#E1E4E8;">(arena_string) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> arena_string</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">into_bump_str</span><span style="color:#E1E4E8;">(),</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">None</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">start[</span><span style="color:#F97583;">..</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">start</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">len</span><span style="color:#E1E4E8;">() </span><span style="color:#F97583;">-</span><span style="color:#E1E4E8;"> lexer</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">chars</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">as_str</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">len</span><span style="color:#E1E4E8;">()],</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">finish</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, lexer</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#6F42C1;">Lexer</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">alloc</span><span style="color:#24292E;">&gt;) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">alloc</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">match</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">value</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">take</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Some</span><span style="color:#24292E;">(arena_string) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> arena_string</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">into_bump_str</span><span style="color:#24292E;">(),</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">None</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">start[</span><span style="color:#D73A49;">..</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">start</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">len</span><span style="color:#24292E;">() </span><span style="color:#D73A49;">-</span><span style="color:#24292E;"> lexer</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">chars</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">as_str</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">len</span><span style="color:#24292E;">()],</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>This is clever because 99.9% of the time it will not allocate a new string because escaped strings are rare.</p><p>But the term <code>Cow</code> or &quot;clone-on-write smart pointer&quot; never made sense to me.</p><blockquote><p>The type Cow is a smart pointer providing clone-on-write functionality: it can enclose and provide immutable access to borrowed data, and clone the data lazily when mutation or ownership is required. The type is designed to work with general borrowed data via the Borrow trait.</p></blockquote><p>If you are new to Rust (like I was), then this description just doesn&#39;t help (I still don&#39;t understand what it is talking about).</p><p>It was <a href="https://twitter.com/zack_overflow/status/1620387950264713216" target="_blank" rel="noreferrer">pointed out to me</a> that <code>clone-on-write</code> is just a use case of this data structure. A better name should be called <code>RefOrOwned</code> because it is a type that contains either owned data or a reference.</p><h3 id="simd" tabindex="-1">SIMD <a class="header-anchor" href="#simd" aria-label="Permalink to &quot;SIMD&quot;">​</a></h3><p>When I was going through the old Rust blogs, the <a href="https://blog.rust-lang.org/inside-rust/2020/09/29/Portable-SIMD-PG.html" target="_blank" rel="noreferrer">Announcing the Portable SIMD Project Group</a> caught my attention. I always wanted to play around with SIMD but never got the chance. After some research, I found a use case that may apply to a parser: <a href="https://lemire.me/blog/2017/01/20/how-quickly-can-you-remove-spaces-from-a-string" target="_blank" rel="noreferrer">How quickly can you remove spaces from a string?</a> by Daniel Lemire. So it turns out this has been done before, in a JSON parser called RapidJSON, which <a href="https://rapidjson.org/md_doc_internals.html#SkipwhitespaceWithSIMD" target="_blank" rel="noreferrer">uses SIMD to remove whitespaces</a>.</p><p>So eventually with the help of portable-SIMD and RapidJSON&#39;s code, not only did I manage to <a href="https://github.com/Boshen/oxc/pull/26" target="_blank" rel="noreferrer">skip whitespaces</a>, I also managed to <a href="https://github.com/Boshen/oxc/pull/23" target="_blank" rel="noreferrer">skip multi-line comments</a> as well.</p><p>Both changes improved the performance by a few percent.</p><h3 id="keyword-match" tabindex="-1">Keyword match <a class="header-anchor" href="#keyword-match" aria-label="Permalink to &quot;Keyword match&quot;">​</a></h3><p>At the top of the performance profile, there is a hot code path that takes about 1 - 2% of the total execution time.</p><p>It tries to match a string to a JavaScript keyword:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">match_keyword</span><span style="color:#E1E4E8;">(s</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">Self</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">match</span><span style="color:#E1E4E8;"> s {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;as&quot;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">As</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;do&quot;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Do</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;if&quot;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">If</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">...</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;constructor&quot;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Constructor</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        _ </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Ident</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">match_keyword</span><span style="color:#24292E;">(s</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">Self</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">match</span><span style="color:#24292E;"> s {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;as&quot;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">As</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;do&quot;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Do</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;if&quot;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">If</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">...</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;constructor&quot;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Constructor</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        _ </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Ident</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>With the addition of TypeScript, there are 84 strings for us to match from. After some research, I found a blog from V8 <a href="https://v8.dev/blog/scanner" target="_blank" rel="noreferrer">Blazingly fast parsing, part 1: optimizing the scanner</a>, it describes its <a href="https://source.chromium.org/chromium/chromium/src/+/main:v8/src/parsing/keywords-gen.h" target="_blank" rel="noreferrer">keyword matching code</a> in detail.</p><blockquote><p>Since the list of keywords is static, we can compute a perfect hash function that for each identifier gives us at most one candidate keyword. V8 uses gperf to compute this function. The result computes a hash from the length and first two identifier characters to find the single candidate keyword. We only compare the identifier with the keyword if the length of that keyword matches the input identifier length.</p></blockquote><p>So a quick hash plus an integer comparison should be faster than 84 string comparisons. But we tried <a href="https://github.com/Boshen/oxc/pull/140" target="_blank" rel="noreferrer">again</a> and <a href="https://github.com/Boshen/oxc/pull/171" target="_blank" rel="noreferrer">again</a> to no avail.</p><p>As it turns out, <a href="https://github.com/Boshen/oxc/issues/151#issuecomment-1464818336" target="_blank" rel="noreferrer">LLVM already optimized our code</a>. By using <code>--emit=llvm-ir</code> on <code>rustc</code>, we find the relevant code:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">  switch i64 %s.1, label %bb6 [</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 2, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 3, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit280.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 4, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit325.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 5, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit380.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 6, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit450.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 7, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit540.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 8, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit590.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 9, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit625.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 10, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit655.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 11, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit665.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ], !dbg !191362</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">  switch i64 %s.1, label %bb6 [</span></span>
+<span class="line"><span style="color:#24292e;">    i64 2, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 3, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit280.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 4, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit325.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 5, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit380.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 6, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit450.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 7, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit540.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 8, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit590.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 9, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit625.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 10, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit655.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 11, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit665.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">  ], !dbg !191362</span></span></code></pre></div><p><code>%s</code> is the string, <code>%s.1</code> is its length ... it is branching on the string length! The compiler is smarter than us 😃.</p><p>(Yes, we got so serious with this so we started looking at LLVM IR and assembly code.)</p><p>Later on, <a href="https://twitter.com/strager" target="_blank" rel="noreferrer">@strager</a> posted a very educational YouTube video <a href="https://www.youtube.com/watch?v=DMQ_HcNSOAI" target="_blank" rel="noreferrer">Faster than Rust and C++: the PERFECT hash table </a> on this topic. The video taught us a systematic approach to reasoning about fine-tuning performance problems</p><p>In the end, we concluded that the simple keyword match is enough for us since it was only about 1 - 2% of the performance, and the effort is not worth it after spending a few days on it - Rust does not have all the pieces we need to build this perfect hashmap.</p><h2 id="linter" tabindex="-1">Linter <a class="header-anchor" href="#linter" aria-label="Permalink to &quot;Linter&quot;">​</a></h2><p>A linter is a program that analyzes the source code for problems.</p><p>The simplest linter visits each AST node and checks for rules. <a href="https://rust-unofficial.github.io/patterns/patterns/behavioural/visitor.html" target="_blank" rel="noreferrer">The visitor pattern</a> can be used:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">trait</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Visit</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Sized</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">    // ... lots of visit functions</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">visit_debugger_statement</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, stmt</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">DebuggerStatement</span><span style="color:#E1E4E8;">) {</span></span>
+<span class="line"><span style="color:#6A737D;">        // report error</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">trait</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Visit</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Sized</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">    // ... lots of visit functions</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">visit_debugger_statement</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, stmt</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">DebuggerStatement</span><span style="color:#24292E;">) {</span></span>
+<span class="line"><span style="color:#6A737D;">        // report error</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><h3 id="parent-pointing-tree" tabindex="-1">Parent Pointing Tree <a class="header-anchor" href="#parent-pointing-tree" aria-label="Permalink to &quot;Parent Pointing Tree&quot;">​</a></h3><p>It is easy to go down the AST by using visitors, but what if we want to go up the tree to collect some information?</p><p>This problem is particularly challenging to solve in Rust, because it is not possible to add a pointer to the nodes of the AST.</p><p>Let&#39;s forget about ASTs for a second and focus on generic trees with the property of a node having a pointer to its parent. To build a generic tree, each tree node needs to be the same type <code>Node</code>, we can reference their parent by using <code>Rc</code>:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    parent</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Option</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Rc</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">&gt;&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    parent</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Option</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Rc</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">&gt;&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>It is tedious to work with this pattern if we need mutation, and it is not performant because the nodes have to be dropped at different times.</p><p>A more efficient solution is to use a <code>Vec</code> as its backing storage and use indexes for pointers.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Tree</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    nodes</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">&gt;</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    parent</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Option</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">&gt;</span><span style="color:#6A737D;"> // index into \`nodes\`</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Tree</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    nodes</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">&gt;</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    parent</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Option</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">&gt;</span><span style="color:#6A737D;"> // index into \`nodes\`</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p><a href="https://crates.io/crates/indextree" target="_blank" rel="noreferrer"><code>indextree</code></a> is a nice library for this task.</p><p>Back to our AST, we can build a <code>indextree</code> by having the nodes point to an enum that wraps every single kind of AST node. We call this the untyped AST.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">BlockStatement</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">BlockStatement</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ArrayExpression</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">ArrayExpression</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Class</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Class</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">BlockStatement</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">BlockStatement</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ArrayExpression</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">ArrayExpression</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Class</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Class</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>The last missing piece is to have callbacks inside the visitor pattern that builds this tree.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">trait</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Visit</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">enter_node</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, _kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {}</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">leave_node</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, _kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">visit_block_statement</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, stmt</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">BlockStatement</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> kind </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">BlockStatement</span><span style="color:#E1E4E8;">(stmt);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">enter_node</span><span style="color:#E1E4E8;">(kind);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">visit_statements</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">stmt</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">body);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">leave_node</span><span style="color:#E1E4E8;">(kind);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">impl</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; </span><span style="color:#B392F0;">Visit</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; </span><span style="color:#F97583;">for</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">TreeBuilder</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">enter_node</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">push_ast_node</span><span style="color:#E1E4E8;">(kind);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">leave_node</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">pop_ast_node</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">trait</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Visit</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">enter_node</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, _kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {}</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">leave_node</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, _kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">visit_block_statement</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, stmt</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">BlockStatement</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> kind </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">BlockStatement</span><span style="color:#24292E;">(stmt);</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">enter_node</span><span style="color:#24292E;">(kind);</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">visit_statements</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">stmt</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">body);</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">leave_node</span><span style="color:#24292E;">(kind);</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">impl</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; </span><span style="color:#6F42C1;">Visit</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; </span><span style="color:#D73A49;">for</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">TreeBuilder</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">enter_node</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">push_ast_node</span><span style="color:#24292E;">(kind);</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">leave_node</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">pop_ast_node</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>The final data structure becomes <code>indextree::Arena&lt;Node&lt;&#39;a&gt;&gt;</code> where each <code>Node</code> has a pointer to an <code>AstKind&lt;&#39;a&gt;</code>. <code>indextree::Node::parent</code> can be called to get the parent of any node.</p><p>The nice benefit of making this parent pointing tree is that it becomes convenient to visit AST nodes without having to implement any visitors. A linter becomes a simple loop over all the nodes inside the <code>indextree</code>:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">for</span><span style="color:#E1E4E8;"> node </span><span style="color:#F97583;">in</span><span style="color:#E1E4E8;"> nodes {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">match</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">get</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">kind {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">AstKind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">DebuggerStatement</span><span style="color:#E1E4E8;">(stmt) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">        // report error</span></span>
+<span class="line"><span style="color:#E1E4E8;">        }</span></span>
+<span class="line"><span style="color:#E1E4E8;">        _ </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {}</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">for</span><span style="color:#24292E;"> node </span><span style="color:#D73A49;">in</span><span style="color:#24292E;"> nodes {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">match</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">get</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">kind {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">AstKind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">DebuggerStatement</span><span style="color:#24292E;">(stmt) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">        // report error</span></span>
+<span class="line"><span style="color:#24292E;">        }</span></span>
+<span class="line"><span style="color:#24292E;">        _ </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {}</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>A full example is provided <a href="https://github.com/Boshen/oxc/blob/main/crates/oxc_linter/examples/linter.rs" target="_blank" rel="noreferrer">here</a>.</p><p>At first glance, this process may seem slow and inefficient. However, visiting the typed AST through a memory arena and pushing a pointer into <code>indextree</code> are efficient linear memory access patterns. The current benchmark indicates that this approach is 84 times faster than ESLint, so it is certainly fast enough for our purposes.</p><h3 id="processing-files-in-parallel" tabindex="-1">Processing files in parallel <a class="header-anchor" href="#processing-files-in-parallel" aria-label="Permalink to &quot;Processing files in parallel&quot;">​</a></h3><p>The linter uses the <a href="https://crates.io/crates/ignore" target="_blank" rel="noreferrer">ignore</a> crate for directory traversal, it supports <code>.gitignore</code> and adds additional ignore files such as <code>.eslintignore</code>.</p><p>A small problem with this crate is that it does not have a parallel interface, There is no <code>par_iter</code> for <code>ignore::Walk::new(&quot;.&quot;)</code>.</p><p>Instead, <a href="https://github.com/Boshen/oxc/blob/b51c2df3cc43b9f7d57380acc1552fac7db75fab/crates/oxc_cli/src/lint/runner.rs#L116-L139" target="_blank" rel="noreferrer">primitives need to be used</a></p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> walk </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Walk</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">options);</span></span>
+<span class="line"><span style="color:#B392F0;">rayon</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">spawn</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">move</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    walk</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">iter</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">for_each</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">|</span><span style="color:#E1E4E8;">path</span><span style="color:#F97583;">|</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        tx_path</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">send</span><span style="color:#E1E4E8;">(path)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">unwrap</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">    });</span></span>
+<span class="line"><span style="color:#E1E4E8;">});</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> linter </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Arc</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">clone</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">linter);</span></span>
+<span class="line"><span style="color:#B392F0;">rayon</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">spawn</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">move</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">while</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Ok</span><span style="color:#E1E4E8;">(path) </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> rx_path</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">recv</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> tx_error </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> tx_error</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">clone</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> linter </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Arc</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">clone</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">linter);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">rayon</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">spawn</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">move</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">            </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Some</span><span style="color:#E1E4E8;">(diagnostics) </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">Self</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">lint_path</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">linter, </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">path) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">                tx_error</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">send</span><span style="color:#E1E4E8;">(diagnostics)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">unwrap</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">            }</span></span>
+<span class="line"><span style="color:#E1E4E8;">            </span><span style="color:#B392F0;">drop</span><span style="color:#E1E4E8;">(tx_error);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        });</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">});</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> walk </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Walk</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">options);</span></span>
+<span class="line"><span style="color:#6F42C1;">rayon</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">spawn</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">move</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    walk</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">iter</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">for_each</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">|</span><span style="color:#24292E;">path</span><span style="color:#D73A49;">|</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">        tx_path</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">send</span><span style="color:#24292E;">(path)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">unwrap</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">    });</span></span>
+<span class="line"><span style="color:#24292E;">});</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> linter </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Arc</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">clone</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">linter);</span></span>
+<span class="line"><span style="color:#6F42C1;">rayon</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">spawn</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">move</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">while</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Ok</span><span style="color:#24292E;">(path) </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> rx_path</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">recv</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> tx_error </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> tx_error</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">clone</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> linter </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Arc</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">clone</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">linter);</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">rayon</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">spawn</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">move</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">            </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Some</span><span style="color:#24292E;">(diagnostics) </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">Self</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">lint_path</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">linter, </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">path) {</span></span>
+<span class="line"><span style="color:#24292E;">                tx_error</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">send</span><span style="color:#24292E;">(diagnostics)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">unwrap</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">            }</span></span>
+<span class="line"><span style="color:#24292E;">            </span><span style="color:#6F42C1;">drop</span><span style="color:#24292E;">(tx_error);</span></span>
+<span class="line"><span style="color:#24292E;">        });</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">});</span></span></code></pre></div><p>This unlocks a useful feature where we can print all diagnostics in a single thread, which leads us to the final topic of this article.</p><h3 id="printing-is-slow" tabindex="-1">Printing is slow <a class="header-anchor" href="#printing-is-slow" aria-label="Permalink to &quot;Printing is slow&quot;">​</a></h3><p>Printing the diagnostics was fast, but I have been working on this project for so long that it felt like an eternity to print thousands of diagnostic messages every time I run the linter on huge monorepos. So I started searching through the Rust GitHub issues and eventually found the relevant ones:</p><ul><li><a href="https://github.com/rust-lang/rust/issues/60673" target="_blank" rel="noreferrer">io::Stdout should use block buffering when appropriate</a></li><li><a href="https://github.com/rust-lang/rust/issues/106133" target="_blank" rel="noreferrer">stdin and stdout performance considerations are not documented</a></li></ul><p>In summary, a <code>println!</code> call will lock <code>stdout</code> every time it encounters a newline, this is called line buffering. To make things print faster, we need to opt-in for block buffering which is <a href="https://rust-cli.github.io/book/tutorial/output.html#a-note-on-printing-performance" target="_blank" rel="noreferrer">documented here</a>.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">io</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{</span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">Write</span><span style="color:#E1E4E8;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> stdout </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">io</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">stdout</span><span style="color:#E1E4E8;">();</span><span style="color:#6A737D;"> // get the global stdout entity</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">mut</span><span style="color:#E1E4E8;"> handle </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">io</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">BufWriter</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(stdout);</span><span style="color:#6A737D;"> // optional: wrap that handle in a buffer</span></span>
+<span class="line"><span style="color:#B392F0;">writeln!</span><span style="color:#E1E4E8;">(handle, </span><span style="color:#9ECBFF;">&quot;foo: {}&quot;</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">42</span><span style="color:#E1E4E8;">);</span><span style="color:#6A737D;"> // add \`?\` if you care about errors here</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">io</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">{</span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">Write</span><span style="color:#24292E;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> stdout </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">io</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">stdout</span><span style="color:#24292E;">();</span><span style="color:#6A737D;"> // get the global stdout entity</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">mut</span><span style="color:#24292E;"> handle </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">io</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">BufWriter</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(stdout);</span><span style="color:#6A737D;"> // optional: wrap that handle in a buffer</span></span>
+<span class="line"><span style="color:#6F42C1;">writeln!</span><span style="color:#24292E;">(handle, </span><span style="color:#032F62;">&quot;foo: {}&quot;</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">42</span><span style="color:#24292E;">);</span><span style="color:#6A737D;"> // add \`?\` if you care about errors here</span></span></code></pre></div><p>Or acquire the lock on stdout.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> stdout </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">io</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">stdout</span><span style="color:#E1E4E8;">();</span><span style="color:#6A737D;"> // get the global stdout entity</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">mut</span><span style="color:#E1E4E8;"> handle </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> stdout</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">lock</span><span style="color:#E1E4E8;">();</span><span style="color:#6A737D;"> // acquire a lock on it</span></span>
+<span class="line"><span style="color:#B392F0;">writeln!</span><span style="color:#E1E4E8;">(handle, </span><span style="color:#9ECBFF;">&quot;foo: {}&quot;</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">42</span><span style="color:#E1E4E8;">);</span><span style="color:#6A737D;"> // add \`?\` if you care about errors here</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> stdout </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">io</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">stdout</span><span style="color:#24292E;">();</span><span style="color:#6A737D;"> // get the global stdout entity</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">mut</span><span style="color:#24292E;"> handle </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> stdout</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">lock</span><span style="color:#24292E;">();</span><span style="color:#6A737D;"> // acquire a lock on it</span></span>
+<span class="line"><span style="color:#6F42C1;">writeln!</span><span style="color:#24292E;">(handle, </span><span style="color:#032F62;">&quot;foo: {}&quot;</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">42</span><span style="color:#24292E;">);</span><span style="color:#6A737D;"> // add \`?\` if you care about errors here</span></span></code></pre></div>`,166),e=[o];function t(r,c,y,E,i,d){return a(),n("div",null,e)}const F=s(p,[["render",t]]);export{h as __pageData,F as default};
diff --git a/assets/ja_docs_learn_performance.md.239666b7.lean.js b/assets/ja_docs_learn_performance.md.239666b7.lean.js
new file mode 100644
index 0000000000..c4706584d2
--- /dev/null
+++ b/assets/ja_docs_learn_performance.md.239666b7.lean.js
@@ -0,0 +1 @@
+import{_ as s,o as a,c as n,Q as l}from"./chunks/framework.725e5b03.js";const h=JSON.parse('{"title":"Performance","description":"","frontmatter":{"title":"Performance","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/performance.md","filePath":"ja/docs/learn/performance.md","lastUpdated":1701053760000}'),p={name:"ja/docs/learn/performance.md"},o=l("",166),e=[o];function t(r,c,y,E,i,d){return a(),n("div",null,e)}const F=s(p,[["render",t]]);export{h as __pageData,F as default};
diff --git a/assets/ja_docs_learn_references.md.fa521212.js b/assets/ja_docs_learn_references.md.fa521212.js
new file mode 100644
index 0000000000..ca3d9bc7aa
--- /dev/null
+++ b/assets/ja_docs_learn_references.md.fa521212.js
@@ -0,0 +1 @@
+import{_ as e,o as r,c as a,Q as t}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"References","description":"","frontmatter":{"title":"References","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/references.md","filePath":"ja/docs/learn/references.md","lastUpdated":1701053760000}'),l={name:"ja/docs/learn/references.md"},i=t('<h1 id="references" tabindex="-1">References <a class="header-anchor" href="#references" aria-label="Permalink to &quot;References&quot;">​</a></h1><h2 id="projects-using-oxc" tabindex="-1">Projects Using Oxc <a class="header-anchor" href="#projects-using-oxc" aria-label="Permalink to &quot;Projects Using Oxc&quot;">​</a></h2><h2 id="📚-learning-resources" tabindex="-1">📚 Learning Resources <a class="header-anchor" href="#📚-learning-resources" aria-label="Permalink to &quot;📚 Learning Resources&quot;">​</a></h2><ul><li>My small tutorial on <a href="https://oxc-project.github.io/javascript-parser-in-rust" target="_blank" rel="noreferrer">how to write a JavaScript Parser in Rust</a></li><li>My small article <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">Pursuit of Performance on Building a JavaScript Compiler</a></li><li><a href="https://craftinginterpreters.com" target="_blank" rel="noreferrer">Crafting Interpreters</a></li><li><a href="https://vimeo.com/649009599" target="_blank" rel="noreferrer">Andrew Kelley - Practical DOD</a></li></ul><h2 id="parsers-in-active-development" tabindex="-1">Parsers (in active development) <a class="header-anchor" href="#parsers-in-active-development" aria-label="Permalink to &quot;Parsers (in active development)&quot;">​</a></h2><ul><li>Rust <ul><li><a href="https://swc.rs" target="_blank" rel="noreferrer">swc</a></li><li><a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a></li><li><a href="https://github.com/ratel-rust/ratel-core" target="_blank" rel="noreferrer">ratel</a></li><li><a href="https://github.com/lastmjs/boa-azle" target="_blank" rel="noreferrer">boa</a></li></ul></li><li>JavaScript <ul><li><a href="https://github.com/acornjs/acorn" target="_blank" rel="noreferrer">acorn</a></li><li><a href="https://babeljs.io" target="_blank" rel="noreferrer">babel</a></li></ul></li><li>Go <ul><li><a href="https://esbuild.github.io" target="_blank" rel="noreferrer">esbuild</a></li></ul></li><li>C++ <ul><li><a href="https://github.com/quick-lint/quick-lint-js" target="_blank" rel="noreferrer">quick-lint-js</a></li></ul></li></ul><h2 id="ast" tabindex="-1">AST <a class="header-anchor" href="#ast" aria-label="Permalink to &quot;AST&quot;">​</a></h2><ul><li><a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a></li><li><a href="https://github.com/swc-project/swc/tree/main/crates/swc_ecma_ast/src" target="_blank" rel="noreferrer">swc_ecma_ast</a></li><li><a href="https://github.com/babel/babel/blob/main/packages/babel-types/src/ast-types/generated/index.ts" target="_blank" rel="noreferrer">babel ast</a></li><li><a href="https://gist.github.com/Boshen/0b481a058cd715576aaf1624d2c6d469" target="_blank" rel="noreferrer">jsparagus</a></li></ul><h2 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h2><ul><li><a href="https://nnethercote.github.io/perf-book/introduction.html" target="_blank" rel="noreferrer">The Rust Performance Book</a></li></ul><h2 id="blog-posts" tabindex="-1">Blog Posts <a class="header-anchor" href="#blog-posts" aria-label="Permalink to &quot;Blog Posts&quot;">​</a></h2><ul><li><a href="https://v8.dev/blog/scanner" target="_blank" rel="noreferrer">Blazingly fast parsing, part 1: optimizing the scanner</a></li><li><a href="https://v8.dev/blog/preparser" target="_blank" rel="noreferrer">Blazingly fast parsing, part 2: lazy parsing</a></li><li><a href="https://v8.dev/blog/tags/understanding-ecmascript" target="_blank" rel="noreferrer">Understanding ECMAScript</a></li><li><a href="https://matklad.github.io/2020/04/13/simple-but-powerful-pratt-parsing.html" target="_blank" rel="noreferrer">Simple but Powerful Pratt Parsing</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">JS syntactic quirks</a></li></ul>',12),s=[i];function n(o,c,h,u,p,f){return r(),a("div",null,s)}const d=e(l,[["render",n]]);export{g as __pageData,d as default};
diff --git a/assets/ja_docs_learn_references.md.fa521212.lean.js b/assets/ja_docs_learn_references.md.fa521212.lean.js
new file mode 100644
index 0000000000..1a320a3f84
--- /dev/null
+++ b/assets/ja_docs_learn_references.md.fa521212.lean.js
@@ -0,0 +1 @@
+import{_ as e,o as r,c as a,Q as t}from"./chunks/framework.725e5b03.js";const g=JSON.parse('{"title":"References","description":"","frontmatter":{"title":"References","outline":"deep"},"headers":[],"relativePath":"ja/docs/learn/references.md","filePath":"ja/docs/learn/references.md","lastUpdated":1701053760000}'),l={name:"ja/docs/learn/references.md"},i=t("",12),s=[i];function n(o,c,h,u,p,f){return r(),a("div",null,s)}const d=e(l,[["render",n]]);export{g as __pageData,d as default};
diff --git a/assets/ja_index.md.2f58577e.js b/assets/ja_index.md.2f58577e.js
new file mode 100644
index 0000000000..0dedd68f1d
--- /dev/null
+++ b/assets/ja_index.md.2f58577e.js
@@ -0,0 +1 @@
+import{_ as e,o as t,c as a}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"","description":"","frontmatter":{"layout":"home","hero":{"name":"The JavaScript Oxidation Compiler","tagline":"Rust製JavaScriptツールコレクション","image":{"src":"https://raw.githubusercontent.com/oxc-project/oxc-assets/main/logo-round.png","alt":"The JavaScript Oxidation Compiler"},"actions":[{"theme":"brand","text":"はじめる","link":"/ja/docs/guide/introduction"},{"theme":"alt","text":"GitHubで見る","link":"https://github.com/oxc-project/oxc"}]},"features":[{"title":"Parser ✅","details":"SWCの2倍速","link":"/ja/docs/guide/usage/parser","linkText":"さらに学ぶ"},{"title":"Linter ✅","details":"ESLintの50~100倍速","link":"/ja/docs/guide/usage/linter","linkText":"さらに学ぶ"},{"title":"Resolver ✅","details":"enhanced-resolveの28倍速","link":"/ja/docs/guide/usage/resolver","linkText":"さらに学ぶ"},{"title":"Formatter 🚧","details":"Prettier互換"},{"title":"Transformer 🚧","details":"Babel互換"},{"title":"Minifier 🚧","details":"より早く効率的な圧縮"},{"title":"Rspack ✅","details":"Webpack互換","link":"https://rspack.dev","external":true},{"title":"Rolldown","details":"Rust製Rollup"},{"title":"Ezno Type Checker","details":"新しいTypeScript型チェッカー","link":"https://github.com/kaleidawave/ezno","external":true}]},"headers":[],"relativePath":"ja/index.md","filePath":"ja/index.md","lastUpdated":1701053760000}'),i={name:"ja/index.md"};function r(l,n,o,s,d,c){return t(),a("div")}const m=e(i,[["render",r]]);export{u as __pageData,m as default};
diff --git a/assets/ja_index.md.2f58577e.lean.js b/assets/ja_index.md.2f58577e.lean.js
new file mode 100644
index 0000000000..0dedd68f1d
--- /dev/null
+++ b/assets/ja_index.md.2f58577e.lean.js
@@ -0,0 +1 @@
+import{_ as e,o as t,c as a}from"./chunks/framework.725e5b03.js";const u=JSON.parse('{"title":"","description":"","frontmatter":{"layout":"home","hero":{"name":"The JavaScript Oxidation Compiler","tagline":"Rust製JavaScriptツールコレクション","image":{"src":"https://raw.githubusercontent.com/oxc-project/oxc-assets/main/logo-round.png","alt":"The JavaScript Oxidation Compiler"},"actions":[{"theme":"brand","text":"はじめる","link":"/ja/docs/guide/introduction"},{"theme":"alt","text":"GitHubで見る","link":"https://github.com/oxc-project/oxc"}]},"features":[{"title":"Parser ✅","details":"SWCの2倍速","link":"/ja/docs/guide/usage/parser","linkText":"さらに学ぶ"},{"title":"Linter ✅","details":"ESLintの50~100倍速","link":"/ja/docs/guide/usage/linter","linkText":"さらに学ぶ"},{"title":"Resolver ✅","details":"enhanced-resolveの28倍速","link":"/ja/docs/guide/usage/resolver","linkText":"さらに学ぶ"},{"title":"Formatter 🚧","details":"Prettier互換"},{"title":"Transformer 🚧","details":"Babel互換"},{"title":"Minifier 🚧","details":"より早く効率的な圧縮"},{"title":"Rspack ✅","details":"Webpack互換","link":"https://rspack.dev","external":true},{"title":"Rolldown","details":"Rust製Rollup"},{"title":"Ezno Type Checker","details":"新しいTypeScript型チェッカー","link":"https://github.com/kaleidawave/ezno","external":true}]},"headers":[],"relativePath":"ja/index.md","filePath":"ja/index.md","lastUpdated":1701053760000}'),i={name:"ja/index.md"};function r(l,n,o,s,d,c){return t(),a("div")}const m=e(i,[["render",r]]);export{u as __pageData,m as default};
diff --git a/assets/style.82c265ef.css b/assets/style.dd858c05.css
similarity index 99%
rename from assets/style.82c265ef.css
rename to assets/style.dd858c05.css
index 1776387912..c486c8f27c 100644
--- a/assets/style.82c265ef.css
+++ b/assets/style.dd858c05.css
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data-v-30a5e70a><div><p><a href="https://github.com/rome/tools" target="_blank" rel="noreferrer">Rome</a> uses a different set of techniques for parsing JavaScript and TypeScript. This tutorial summarizes them in learning order for better understanding.</p><h2 id="history" tabindex="-1">History <a class="header-anchor" href="#history" aria-label="Permalink to &quot;History&quot;">​</a></h2><ul><li>The Rome codebase was rewritten from TypeScript to Rust, see <a href="https://rome.tools/blog/2021/09/21/rome-will-be-rewritten-in-rust" target="_blank" rel="noreferrer">Rome will be rewritten in Rust</a></li><li>The decision was made after talking to the author of <a href="https://github.com/rslint/rslint" target="_blank" rel="noreferrer">rslint</a> and <a href="https://github.com/rust-lang/rust-analyzer" target="_blank" rel="noreferrer">rust-analyzer</a></li><li>rust-analyzer proved that IDE-centric tools built around concrete syntax tree are possible</li><li>rslint proved that it is possible to write a JavaScript parser in Rust, with the same base libraries as rust-analyzer</li><li>Rome ported the rslint codebase to their own repo with permission from rslint&#39;s author</li></ul><h2 id="concrete-syntax-tree" tabindex="-1">Concrete Syntax Tree <a class="header-anchor" href="#concrete-syntax-tree" aria-label="Permalink to &quot;Concrete Syntax Tree&quot;">​</a></h2><ul><li>The base library is called <a href="https://github.com/rust-analyzer/rowan" target="_blank" rel="noreferrer">rowan</a>, see <a href="https://github.com/rust-lang/rust-analyzer/blob/master/docs/dev/syntax.md" target="_blank" rel="noreferrer">overview of rowan</a></li><li>Rowan, also known as red-green trees, is named after the real green <a href="https://en.wikipedia.org/wiki/Rowan" target="_blank" rel="noreferrer">rowan tree</a> that makes red berries</li><li>The origin of red-green trees is described in this <a href="https://ericlippert.com/2012/06/08/red-green-trees/" target="_blank" rel="noreferrer">blog post</a>, by the authors of the C# programming language</li><li>The whole point of rowan is to define a lossless concrete syntax tree (CST) that describes all the details of the source code and provides a set of traversal APIs (parent, children, siblings, etc)</li><li>Read the advantage of having a CST over an AST: <a href="https://rdambrosio016.github.io/rust/2020/09/18/pure-ast-based-linting-sucks.html" target="_blank" rel="noreferrer">Pure AST based linting sucks</a></li><li>CST provides the ability to build a fully recoverable parser</li></ul><h2 id="grammar" tabindex="-1">Grammar <a class="header-anchor" href="#grammar" aria-label="Permalink to &quot;Grammar&quot;">​</a></h2><ul><li>Just like an AST, we need to define the grammar. The grammar is auto-generated by using <a href="https://github.com/rome/tools/tree/main/xtask/codegen" target="_blank" rel="noreferrer">xtask/codegen</a></li><li>The grammar is generated from the <a href="https://github.com/rust-analyzer/ungrammar" target="_blank" rel="noreferrer">ungrammar</a> DSL</li><li>The input <code>ungrammar</code> source file is in <a href="https://github.com/rome/tools/blob/main/xtask/codegen/js.ungram" target="_blank" rel="noreferrer">xtask/codegen/js.ungram</a></li><li>The output of the codegen is in <a href="https://github.com/rome/tools/tree/main/crates/rome_js_syntax/src/generated" target="_blank" rel="noreferrer">rome_js_syntax/src/generated</a></li></ul><h2 id="entry-point" tabindex="-1">Entry Point <a class="header-anchor" href="#entry-point" aria-label="Permalink to &quot;Entry Point&quot;">​</a></h2><p>The Rome codebase is getting large and slightly difficult to find the parser entry point.</p><p>For first-time contributors, the <code>rome_cli</code> crate is the binary entry point for running the code:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span></span>
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aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _blog_" data-v-30a5e70a><div><p><a href="https://github.com/rome/tools" target="_blank" rel="noreferrer">Rome</a> uses a different set of techniques for parsing JavaScript and TypeScript. This tutorial summarizes them in learning order for better understanding.</p><h2 id="history" tabindex="-1">History <a class="header-anchor" href="#history" aria-label="Permalink to &quot;History&quot;">​</a></h2><ul><li>The Rome codebase was rewritten from TypeScript to Rust, see <a href="https://rome.tools/blog/2021/09/21/rome-will-be-rewritten-in-rust" target="_blank" rel="noreferrer">Rome will be rewritten in Rust</a></li><li>The decision was made after talking to the author of <a href="https://github.com/rslint/rslint" target="_blank" rel="noreferrer">rslint</a> and <a href="https://github.com/rust-lang/rust-analyzer" target="_blank" rel="noreferrer">rust-analyzer</a></li><li>rust-analyzer proved that IDE-centric tools built around concrete syntax tree are possible</li><li>rslint proved that it is possible to write a JavaScript parser in Rust, with the same base libraries as rust-analyzer</li><li>Rome ported the rslint codebase to their own repo with permission from rslint&#39;s author</li></ul><h2 id="concrete-syntax-tree" tabindex="-1">Concrete Syntax Tree <a class="header-anchor" href="#concrete-syntax-tree" aria-label="Permalink to &quot;Concrete Syntax Tree&quot;">​</a></h2><ul><li>The base library is called <a href="https://github.com/rust-analyzer/rowan" target="_blank" rel="noreferrer">rowan</a>, see <a href="https://github.com/rust-lang/rust-analyzer/blob/master/docs/dev/syntax.md" target="_blank" rel="noreferrer">overview of rowan</a></li><li>Rowan, also known as red-green trees, is named after the real green <a href="https://en.wikipedia.org/wiki/Rowan" target="_blank" rel="noreferrer">rowan tree</a> that makes red berries</li><li>The origin of red-green trees is described in this <a href="https://ericlippert.com/2012/06/08/red-green-trees/" target="_blank" rel="noreferrer">blog post</a>, by the authors of the C# programming language</li><li>The whole point of rowan is to define a lossless concrete syntax tree (CST) that describes all the details of the source code and provides a set of traversal APIs (parent, children, siblings, etc)</li><li>Read the advantage of having a CST over an AST: <a href="https://rdambrosio016.github.io/rust/2020/09/18/pure-ast-based-linting-sucks.html" target="_blank" rel="noreferrer">Pure AST based linting sucks</a></li><li>CST provides the ability to build a fully recoverable parser</li></ul><h2 id="grammar" tabindex="-1">Grammar <a class="header-anchor" href="#grammar" aria-label="Permalink to &quot;Grammar&quot;">​</a></h2><ul><li>Just like an AST, we need to define the grammar. The grammar is auto-generated by using <a href="https://github.com/rome/tools/tree/main/xtask/codegen" target="_blank" rel="noreferrer">xtask/codegen</a></li><li>The grammar is generated from the <a href="https://github.com/rust-analyzer/ungrammar" target="_blank" rel="noreferrer">ungrammar</a> DSL</li><li>The input <code>ungrammar</code> source file is in <a href="https://github.com/rome/tools/blob/main/xtask/codegen/js.ungram" target="_blank" rel="noreferrer">xtask/codegen/js.ungram</a></li><li>The output of the codegen is in <a href="https://github.com/rome/tools/tree/main/crates/rome_js_syntax/src/generated" target="_blank" rel="noreferrer">rome_js_syntax/src/generated</a></li></ul><h2 id="entry-point" tabindex="-1">Entry Point <a class="header-anchor" href="#entry-point" aria-label="Permalink to &quot;Entry Point&quot;">​</a></h2><p>The Rome codebase is getting large and slightly difficult to find the parser entry point.</p><p>For first-time contributors, the <code>rome_cli</code> crate is the binary entry point for running the code:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span></span>
 <span class="line"></span>
 <span class="line"><span style="color:#B392F0;">touch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">test.js</span></span>
 <span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">check</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">./test.js</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">rome_cli</span></span>
 <span class="line"></span>
 <span class="line"><span style="color:#6F42C1;">touch</span><span style="color:#24292E;"> </span><span style="color:#032F62;">test.js</span></span>
-<span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">rome_cli</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--</span><span style="color:#24292E;"> </span><span style="color:#032F62;">check</span><span style="color:#24292E;"> </span><span style="color:#032F62;">./test.js</span></span></code></pre></div><p><code>rome_cli</code> will eventually call <code>rome_js_parser::parse</code></p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/parse.rs#L178-L187</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/parse.rs#L178-L187</span></span></code></pre></div><p>and finally the actual parsing code</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/syntax/program.rs#L14-L17</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/syntax/program.rs#L14-L17</span></span></code></pre></div><h2 id="contributing" tabindex="-1">Contributing <a class="header-anchor" href="#contributing" aria-label="Permalink to &quot;Contributing&quot;">​</a></h2><ul><li><a href="https://github.com/rome/tools/blob/main/CONTRIBUTING.md" target="_blank" rel="noreferrer">CONTRIBUTING.md</a> has instructions on how to contribute</li><li><a href="https://rome.github.io/tools/rome_js_parser/index.html" target="_blank" rel="noreferrer">rome_js_parser crate doc</a> has some more details on the parser</li><li>See <a href="https://github.com/rome/tools/tree/main/xtask/codegen#cargo-codegen-test" target="_blank" rel="noreferrer"><code>cargo codegen test</code></a> for working with parser tests</li><li>See <a href="https://github.com/rome/tools/tree/main/xtask/coverage" target="_blank" rel="noreferrer"><code>cargo coverage</code></a> for working with conformance tests</li><li>Join the <a href="https://discord.com/invite/rome" target="_blank" rel="noreferrer">Discord Server</a> for inquiries</li></ul><div class="info custom-block"><p class="custom-block-title">INFO</p><p>The JavaScript / TypeScript parser is 99% complete, the best way to help is to test Rome in your own codebases or take a look at the <a href="https://github.com/rome/tools/issues" target="_blank" rel="noreferrer">issues on Github</a>.</p></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/blog/index.md" target="_blank" rel="noreferrer" 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+<span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">rome_cli</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--</span><span style="color:#24292E;"> </span><span style="color:#032F62;">check</span><span style="color:#24292E;"> </span><span style="color:#032F62;">./test.js</span></span></code></pre></div><p><code>rome_cli</code> will eventually call <code>rome_js_parser::parse</code></p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/parse.rs#L178-L187</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/parse.rs#L178-L187</span></span></code></pre></div><p>and finally the actual parsing code</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/syntax/program.rs#L14-L17</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/syntax/program.rs#L14-L17</span></span></code></pre></div><h2 id="contributing" tabindex="-1">Contributing <a class="header-anchor" href="#contributing" aria-label="Permalink to &quot;Contributing&quot;">​</a></h2><ul><li><a href="https://github.com/rome/tools/blob/main/CONTRIBUTING.md" target="_blank" rel="noreferrer">CONTRIBUTING.md</a> has instructions on how to contribute</li><li><a href="https://rome.github.io/tools/rome_js_parser/index.html" target="_blank" rel="noreferrer">rome_js_parser crate doc</a> has some more details on the parser</li><li>See <a href="https://github.com/rome/tools/tree/main/xtask/codegen#cargo-codegen-test" target="_blank" rel="noreferrer"><code>cargo codegen test</code></a> for working with parser tests</li><li>See <a href="https://github.com/rome/tools/tree/main/xtask/coverage" target="_blank" rel="noreferrer"><code>cargo coverage</code></a> for working with conformance tests</li><li>Join the <a href="https://discord.com/invite/rome" target="_blank" rel="noreferrer">Discord Server</a> for inquiries</li></ul><div class="info custom-block"><p class="custom-block-title">INFO</p><p>The JavaScript / TypeScript parser is 99% complete, the best way to help is to test Rome in your own codebases or take a look at the <a href="https://github.com/rome/tools/issues" target="_blank" rel="noreferrer">issues on Github</a>.</p></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/blog/index.md" target="_blank" rel="noreferrer" 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Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_development" data-v-30a5e70a><div><h1 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h1><p>This page explains how to set up enrionment for OXC development.</p><h2 id="clone-repository" tabindex="-1">Clone Repository <a class="header-anchor" href="#clone-repository" aria-label="Permalink to &quot;Clone Repository&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">git</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">clone</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--recurse-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--shallow-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">git@github.com:oxc-project/oxc.git</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">git</span><span style="color:#24292E;"> </span><span style="color:#032F62;">clone</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--recurse-submodules</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--shallow-submodules</span><span style="color:#24292E;"> </span><span style="color:#032F62;">git@github.com:oxc-project/oxc.git</span></span></code></pre></div><p>The <code>--recurse-submodules</code> and <code>--shallow-submodules</code> flags are needed to initialize git submodules that are needed to run conformance tests.</p><h2 id="set-up-project" tabindex="-1">Set Up Project <a class="header-anchor" href="#set-up-project" aria-label="Permalink to &quot;Set Up Project&quot;">​</a></h2><h3 id="install-rust" tabindex="-1">Install Rust <a class="header-anchor" href="#install-rust" aria-label="Permalink to &quot;Install Rust&quot;">​</a></h3><p>If you have not yet installed Rust, follow <a href="https://www.rust-lang.org/tools/install" target="_blank" rel="noreferrer">the official instruction</a> and install Rust.</p><p>After installing Rust, run the following command at the project root:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">rustup</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">show</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">rustup</span><span style="color:#24292E;"> </span><span style="color:#032F62;">show</span></span></code></pre></div><p><code>rustup show</code> reads the <code>./rust-toolchain.toml</code> file and installs the correct Rust toolchain and components for this project.</p><h3 id="install-project-tools" tabindex="-1">Install Project Tools <a class="header-anchor" href="#install-project-tools" aria-label="Permalink to &quot;Install Project Tools&quot;">​</a></h3><h4 id="cargo-binstall" tabindex="-1"><code>cargo-binstall</code> <a class="header-anchor" href="#cargo-binstall" aria-label="Permalink to &quot;`cargo-binstall`&quot;">​</a></h4><p>Some Cargo tools are required to develop OXC, and it is recommended to use <a href="https://github.com/cargo-bins/cargo-binstall" target="_blank" rel="noreferrer">cargo binstall</a>, which provides a low-complexity mechanism to install rust binaries and is fater way than building them from source by running <code>cargo install</code>.</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo-binstall</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo-binstall</span></span></code></pre></div><p>You can also download <a href="https://github.com/cargo-bins/cargo-binstall#installation" target="_blank" rel="noreferrer">the pre-compiled binary</a> and save it in <code>~/.cargo/bin</code>.</p><h4 id="just" tabindex="-1"><code>just</code> <a class="header-anchor" href="#just" aria-label="Permalink to &quot;`just`&quot;">​</a></h4><p>OXC utilizes <a href="https://github.com/casey/just" target="_blank" rel="noreferrer"><code>just</code></a>, which is a handy way to save and run project-specific commands:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">binstall</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-y</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">binstall</span><span style="color:#24292E;"> </span><span style="color:#032F62;">just</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-y</span></span></code></pre></div><h4 id="dependencies" tabindex="-1">Dependencies <a class="header-anchor" href="#dependencies" aria-label="Permalink to &quot;Dependencies&quot;">​</a></h4><p>Run the following command in <code>justfile</code> at the project root to install dependencies:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">init</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">init</span></span></code></pre></div><p>You can see the list of available commands by running <code>just</code>.</p><p>You can run <code>just ready</code> (or, <code>just r</code> in short) to make sure the whole project builds and runs correctly.</p><hr><p>Now you are ready to develop OXC! You can check out <a href="https://github.com/oxc-project/oxc/contribute" target="_blank" rel="noreferrer">good first issues</a> or ask us on <a href="https://discord.gg/9uXCAwqQZW" target="_blank" rel="noreferrer">Discord</a>.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/development.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/contribute/introduction.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Introduction</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/contribute/parser.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Parser</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_development" data-v-30a5e70a><div><h1 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h1><p>This page explains how to set up enrionment for OXC development.</p><h2 id="clone-repository" tabindex="-1">Clone Repository <a class="header-anchor" href="#clone-repository" aria-label="Permalink to &quot;Clone Repository&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">git</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">clone</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--recurse-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--shallow-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">git@github.com:oxc-project/oxc.git</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">git</span><span style="color:#24292E;"> </span><span style="color:#032F62;">clone</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--recurse-submodules</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--shallow-submodules</span><span style="color:#24292E;"> </span><span style="color:#032F62;">git@github.com:oxc-project/oxc.git</span></span></code></pre></div><p>The <code>--recurse-submodules</code> and <code>--shallow-submodules</code> flags are needed to initialize git submodules that are needed to run conformance tests.</p><h2 id="set-up-project" tabindex="-1">Set Up Project <a class="header-anchor" href="#set-up-project" aria-label="Permalink to &quot;Set Up Project&quot;">​</a></h2><h3 id="install-rust" tabindex="-1">Install Rust <a class="header-anchor" href="#install-rust" aria-label="Permalink to &quot;Install Rust&quot;">​</a></h3><p>If you have not yet installed Rust, follow <a href="https://www.rust-lang.org/tools/install" target="_blank" rel="noreferrer">the official instruction</a> and install Rust.</p><p>After installing Rust, run the following command at the project root:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">rustup</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">show</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">rustup</span><span style="color:#24292E;"> </span><span style="color:#032F62;">show</span></span></code></pre></div><p><code>rustup show</code> reads the <code>./rust-toolchain.toml</code> file and installs the correct Rust toolchain and components for this project.</p><h3 id="install-project-tools" tabindex="-1">Install Project Tools <a class="header-anchor" href="#install-project-tools" aria-label="Permalink to &quot;Install Project Tools&quot;">​</a></h3><h4 id="cargo-binstall" tabindex="-1"><code>cargo-binstall</code> <a class="header-anchor" href="#cargo-binstall" aria-label="Permalink to &quot;`cargo-binstall`&quot;">​</a></h4><p>Some Cargo tools are required to develop OXC, and it is recommended to use <a href="https://github.com/cargo-bins/cargo-binstall" target="_blank" rel="noreferrer">cargo binstall</a>, which provides a low-complexity mechanism to install rust binaries and is fater way than building them from source by running <code>cargo install</code>.</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo-binstall</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo-binstall</span></span></code></pre></div><p>You can also download <a href="https://github.com/cargo-bins/cargo-binstall#installation" target="_blank" rel="noreferrer">the pre-compiled binary</a> and save it in <code>~/.cargo/bin</code>.</p><h4 id="just" tabindex="-1"><code>just</code> <a class="header-anchor" href="#just" aria-label="Permalink to &quot;`just`&quot;">​</a></h4><p>OXC utilizes <a href="https://github.com/casey/just" target="_blank" rel="noreferrer"><code>just</code></a>, which is a handy way to save and run project-specific commands:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">binstall</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-y</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">binstall</span><span style="color:#24292E;"> </span><span style="color:#032F62;">just</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-y</span></span></code></pre></div><h4 id="dependencies" tabindex="-1">Dependencies <a class="header-anchor" href="#dependencies" aria-label="Permalink to &quot;Dependencies&quot;">​</a></h4><p>Run the following command in <code>justfile</code> at the project root to install dependencies:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">init</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">init</span></span></code></pre></div><p>You can see the list of available commands by running <code>just</code>.</p><p>You can run <code>just ready</code> (or, <code>just r</code> in short) to make sure the whole project builds and runs correctly.</p><hr><p>Now you are ready to develop OXC! You can check out <a href="https://github.com/oxc-project/oxc/contribute" target="_blank" rel="noreferrer">good first issues</a> or ask us on <a href="https://discord.gg/9uXCAwqQZW" target="_blank" rel="noreferrer">Discord</a>.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/development.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/contribute/introduction.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Introduction</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/contribute/parser.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Parser</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_introduction" data-v-30a5e70a><div><h1 id="introduction" tabindex="-1">Introduction <a class="header-anchor" href="#introduction" aria-label="Permalink to &quot;Introduction&quot;">​</a></h1><p>Thank you for getting interested in contributing to OXC project! Before starting, please make sure to read the following rules and policy.</p><h2 id="general-rules" tabindex="-1">General Rules <a class="header-anchor" href="#general-rules" aria-label="Permalink to &quot;General Rules&quot;">​</a></h2><ul><li>We welcome and appreciate any form of contributions.</li><li>Please create an issue or discussion if you want to make an architectural change.</li></ul><h2 id="pr-rules" tabindex="-1">PR Rules <a class="header-anchor" href="#pr-rules" aria-label="Permalink to &quot;PR Rules&quot;">​</a></h2><ul><li>We <a href="https://graphite.dev/blog/how-large-prs-slow-down-development" target="_blank" rel="noreferrer">prefer smaller PRs</a> for faster development.</li><li>Try stacked PRs with <a href="https://graphite.dev" target="_blank" rel="noreferrer">graphite</a> if you are given access permission to the repository.</li></ul><h2 id="action-policy" tabindex="-1">Action Policy <a class="header-anchor" href="#action-policy" aria-label="Permalink to &quot;Action Policy&quot;">​</a></h2><p>Taken from <a href="https://astral-sh.notion.site/Astral-s-Values-0ed6a642bcc84e91af6836b2373572f5" target="_blank" rel="noreferrer">Astral&#39;s values</a>:</p><blockquote><p>We bias towards action, even in the face of uncertainty. We favor <em>pragmatic doing</em> over <strong>prolonged debating</strong>; we favor asking for <em>forgiveness</em> over <em>permission</em>. We value <strong>decisiveness — especially</strong> when a decision isn’t clear cut, and <strong>especially</strong> when a decision is reversible.</p><p>A bias towards action is <em>not</em> the same as recklessness. Rather, it’s a bias towards making <em>responsible</em> decisions and acting on them with <em>urgency</em>, even if we’re left with lingering ambiguity or known unknowns.</p></blockquote><h2 id="development-policy" tabindex="-1">Development Policy <a class="header-anchor" href="#development-policy" aria-label="Permalink to &quot;Development Policy&quot;">​</a></h2><ul><li>All performance issues (runtime and compilation speed) are considered as bugs in this project.</li><li>Embrace data-oriented design.</li><li>APIs should be simple and well-documented.</li><li>Third-party dependencies should be minimal.</li><li>Avoid the <code>regex</code> crate when possible. Regexes are slow, most of them can be rewritten in a performant way by using Rust iterator and string methods.</li><li>Avoid macros, traits or any Rust techniques that would penalize compilation speed.</li></ul><h2 id="maintenance-policy" tabindex="-1">Maintenance Policy <a class="header-anchor" href="#maintenance-policy" aria-label="Permalink to &quot;Maintenance Policy&quot;">​</a></h2><ul><li>Monitor code coverage for unused code. Aim for 99% code coverage.</li><li>CI time should be actively monitored and reduced to speed up merging of PRs. 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data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_introduction" data-v-30a5e70a><div><h1 id="introduction" tabindex="-1">Introduction <a class="header-anchor" href="#introduction" aria-label="Permalink to &quot;Introduction&quot;">​</a></h1><p>Thank you for getting interested in contributing to OXC project! Before starting, please make sure to read the following rules and policy.</p><h2 id="general-rules" tabindex="-1">General Rules <a class="header-anchor" href="#general-rules" aria-label="Permalink to &quot;General Rules&quot;">​</a></h2><ul><li>We welcome and appreciate any form of contributions.</li><li>Please create an issue or discussion if you want to make an architectural change.</li></ul><h2 id="pr-rules" tabindex="-1">PR Rules <a class="header-anchor" href="#pr-rules" aria-label="Permalink to &quot;PR Rules&quot;">​</a></h2><ul><li>We <a href="https://graphite.dev/blog/how-large-prs-slow-down-development" target="_blank" rel="noreferrer">prefer smaller PRs</a> for faster development.</li><li>Try stacked PRs with <a href="https://graphite.dev" target="_blank" rel="noreferrer">graphite</a> if you are given access permission to the repository.</li></ul><h2 id="action-policy" tabindex="-1">Action Policy <a class="header-anchor" href="#action-policy" aria-label="Permalink to &quot;Action Policy&quot;">​</a></h2><p>Taken from <a href="https://astral-sh.notion.site/Astral-s-Values-0ed6a642bcc84e91af6836b2373572f5" target="_blank" rel="noreferrer">Astral&#39;s values</a>:</p><blockquote><p>We bias towards action, even in the face of uncertainty. We favor <em>pragmatic doing</em> over <strong>prolonged debating</strong>; we favor asking for <em>forgiveness</em> over <em>permission</em>. We value <strong>decisiveness — especially</strong> when a decision isn’t clear cut, and <strong>especially</strong> when a decision is reversible.</p><p>A bias towards action is <em>not</em> the same as recklessness. Rather, it’s a bias towards making <em>responsible</em> decisions and acting on them with <em>urgency</em>, even if we’re left with lingering ambiguity or known unknowns.</p></blockquote><h2 id="development-policy" tabindex="-1">Development Policy <a class="header-anchor" href="#development-policy" aria-label="Permalink to &quot;Development Policy&quot;">​</a></h2><ul><li>All performance issues (runtime and compilation speed) are considered as bugs in this project.</li><li>Embrace data-oriented design.</li><li>APIs should be simple and well-documented.</li><li>Third-party dependencies should be minimal.</li><li>Avoid the <code>regex</code> crate when possible. Regexes are slow, most of them can be rewritten in a performant way by using Rust iterator and string methods.</li><li>Avoid macros, traits or any Rust techniques that would penalize compilation speed.</li></ul><h2 id="maintenance-policy" tabindex="-1">Maintenance Policy <a class="header-anchor" href="#maintenance-policy" aria-label="Permalink to &quot;Maintenance Policy&quot;">​</a></h2><ul><li>Monitor code coverage for unused code. Aim for 99% code coverage.</li><li>CI time should be actively monitored and reduced to speed up merging of PRs. 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Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_linter" data-v-30a5e70a><div><h1 id="linter" tabindex="-1">Linter <a class="header-anchor" href="#linter" aria-label="Permalink to &quot;Linter&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Create a <code>./test.ts</code> and then</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">watch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">watch</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre></div><h2 id="rule-generation" tabindex="-1">Rule generation <a class="header-anchor" href="#rule-generation" aria-label="Permalink to &quot;Rule generation&quot;">​</a></h2><p>Create a new lint rule by providing the ESLint name</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span></code></pre></div><p>Then add the rule to <code>crates/oxc_linter/src/rules.rs</code>:</p><ol><li>Add to <code>mod</code></li><li>Add to <code>oxc_macros::declare_all_lint_rules</code> at the bottom of the file</li></ol><p>For other plugins, there are also:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span 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data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_linter" data-v-30a5e70a><div><h1 id="linter" tabindex="-1">Linter <a class="header-anchor" href="#linter" aria-label="Permalink to &quot;Linter&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Create a <code>./test.ts</code> and then</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">watch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">watch</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre></div><h2 id="rule-generation" tabindex="-1">Rule generation <a class="header-anchor" href="#rule-generation" aria-label="Permalink to &quot;Rule generation&quot;">​</a></h2><p>Create a new lint rule by providing the ESLint name</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span></code></pre></div><p>Then add the rule to <code>crates/oxc_linter/src/rules.rs</code>:</p><ol><li>Add to <code>mod</code></li><li>Add to <code>oxc_macros::declare_all_lint_rules</code> at the bottom of the file</li></ol><p>For other plugins, there are also:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-jest-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
 <span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-ts-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
 <span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-unicorn-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
 <span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-react-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
@@ -38,8 +38,8 @@
 <span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-ts-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
 <span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-unicorn-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
 <span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-react-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
-<span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-jsx-a11y-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/linter.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/contribute/parser.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Parser</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/contribute/prettier.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Prettier</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_minifier" data-v-30a5e70a><div><h1 id="minifier" tabindex="-1">Minifier <a class="header-anchor" href="#minifier" aria-label="Permalink to &quot;Minifier&quot;">​</a></h1><p>JavaScript minification plays a crucial role in optimizing website performance as it reduces the amount of data sent to users, resulting in faster page loads. This holds tremendous economic value, particularly for e-commerce websites, where every second can equate to millions of dollars.</p><p>However, existing minifiers typically require a trade-off between compression quality and speed. You have to choose between the slowest for the best compression or the fastest for less compression. But what if we could develop a faster minifier without compromising on compression?</p><p>We are actively working on a prototype that aims to achieve this goal, by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].</p><p>Preliminary results indicate that we are on track to achieve our objectives. With the Oxc minifier, you can expect faster minification times without sacrificing compression quality.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/minifier.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/contribute/codegen.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Codegen</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/contribute/vscode.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>VSCode</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_minifier" data-v-30a5e70a><div><h1 id="minifier" tabindex="-1">Minifier <a class="header-anchor" href="#minifier" aria-label="Permalink to &quot;Minifier&quot;">​</a></h1><p>JavaScript minification plays a crucial role in optimizing website performance as it reduces the amount of data sent to users, resulting in faster page loads. This holds tremendous economic value, particularly for e-commerce websites, where every second can equate to millions of dollars.</p><p>However, existing minifiers typically require a trade-off between compression quality and speed. You have to choose between the slowest for the best compression or the fastest for less compression. But what if we could develop a faster minifier without compromising on compression?</p><p>We are actively working on a prototype that aims to achieve this goal, by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].</p><p>Preliminary results indicate that we are on track to achieve our objectives. With the Oxc minifier, you can expect faster minification times without sacrificing compression quality.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/minifier.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/contribute/codegen.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Codegen</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/contribute/vscode.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>VSCode</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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data-v-1a4376dd>Showcase</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_parser" data-v-30a5e70a><div><h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>We aim to be the fastest Rust-based ready-for-production parser.</p><h2 id="conformance-tests" tabindex="-1">Conformance Tests <a class="header-anchor" href="#conformance-tests" aria-label="Permalink to &quot;Conformance Tests&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">c</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">c</span></span></code></pre></div><p>Aliased to <code>just coverage</code>, runs the following conformance test suites by using the conformance runner found in <a href="https://github.com/oxc-project/oxc/tree/main/tasks/coverage" target="_blank" rel="noreferrer">tasks/coverage</a>.</p><h3 id="test262" tabindex="-1">Test262 <a class="header-anchor" href="#test262" aria-label="Permalink to &quot;Test262&quot;">​</a></h3><p>JavaScript has the <a href="https://github.com/tc39/test262" target="_blank" rel="noreferrer">ECMAScript Test Suite</a> called Test262. The goal of Test262 is to provide test material that covers every observable behavior specified in the specification. Parser conformance uses the <a href="https://github.com/tc39/test262/blob/main/INTERPRETING.md#negative" target="_blank" rel="noreferrer">parse phase tests</a>.</p><h3 id="babel" tabindex="-1">Babel <a class="header-anchor" href="#babel" aria-label="Permalink to &quot;Babel&quot;">​</a></h3><p>When new language features are added to JavaScript, it is required to have them implemented by Babel, this means Babel has another set of <a href="https://github.com/babel/babel/tree/main/packages/babel-parser/test" target="_blank" rel="noreferrer">parser tests</a>.</p><h3 id="typescript" tabindex="-1">TypeScript <a class="header-anchor" href="#typescript" aria-label="Permalink to &quot;TypeScript&quot;">​</a></h3><p>The TypeScript conformance tests can be found <a href="https://github.com/microsoft/TypeScript/tree/main/tests/cases/conformance" target="_blank" rel="noreferrer">here</a>.</p><h2 id="test-runner" tabindex="-1">Test Runner <a class="header-anchor" href="#test-runner" aria-label="Permalink to &quot;Test Runner&quot;">​</a></h2><p>Rome has implemented a test runner for the above test suites, they can be found .</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/parser.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/contribute/development.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Development</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/contribute/linter.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Linter</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_parser" data-v-30a5e70a><div><h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>We aim to be the fastest Rust-based ready-for-production parser.</p><h2 id="conformance-tests" tabindex="-1">Conformance Tests <a class="header-anchor" href="#conformance-tests" aria-label="Permalink to &quot;Conformance Tests&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">c</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">c</span></span></code></pre></div><p>Aliased to <code>just coverage</code>, runs the following conformance test suites by using the conformance runner found in <a href="https://github.com/oxc-project/oxc/tree/main/tasks/coverage" target="_blank" rel="noreferrer">tasks/coverage</a>.</p><h3 id="test262" tabindex="-1">Test262 <a class="header-anchor" href="#test262" aria-label="Permalink to &quot;Test262&quot;">​</a></h3><p>JavaScript has the <a href="https://github.com/tc39/test262" target="_blank" rel="noreferrer">ECMAScript Test Suite</a> called Test262. The goal of Test262 is to provide test material that covers every observable behavior specified in the specification. Parser conformance uses the <a href="https://github.com/tc39/test262/blob/main/INTERPRETING.md#negative" target="_blank" rel="noreferrer">parse phase tests</a>.</p><h3 id="babel" tabindex="-1">Babel <a class="header-anchor" href="#babel" aria-label="Permalink to &quot;Babel&quot;">​</a></h3><p>When new language features are added to JavaScript, it is required to have them implemented by Babel, this means Babel has another set of <a href="https://github.com/babel/babel/tree/main/packages/babel-parser/test" target="_blank" rel="noreferrer">parser tests</a>.</p><h3 id="typescript" tabindex="-1">TypeScript <a class="header-anchor" href="#typescript" aria-label="Permalink to &quot;TypeScript&quot;">​</a></h3><p>The TypeScript conformance tests can be found <a href="https://github.com/microsoft/TypeScript/tree/main/tests/cases/conformance" target="_blank" rel="noreferrer">here</a>.</p><h2 id="test-runner" tabindex="-1">Test Runner <a class="header-anchor" href="#test-runner" aria-label="Permalink to &quot;Test Runner&quot;">​</a></h2><p>Rome has implemented a test runner for the above test suites, they can be found .</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/parser.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/contribute/development.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Development</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/contribute/linter.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Linter</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_performance" data-v-30a5e70a><div><h1 id="performance-tuning" tabindex="-1">Performance Tuning <a class="header-anchor" href="#performance-tuning" aria-label="Permalink to &quot;Performance Tuning&quot;">​</a></h1><h2 id="compile-time" tabindex="-1">Compile Time <a class="header-anchor" href="#compile-time" aria-label="Permalink to &quot;Compile Time&quot;">​</a></h2><p>While Rust has gained a reputation for its comparatively slower compilation speed, we have dedicated significant effort to fine-tune the Rust compilation speed. Our aim is to minimize any impact on your development workflow, ensuring that developing your own Oxc based tools remains a smooth and efficient experience.</p><p>This is demonstrated by our <a href="https://github.com/oxc-project/oxc/actions/workflows/ci.yml?query=branch%3Amain" target="_blank" rel="noreferrer">CI runs</a>, where warm runs complete in 5 minutes.</p><h2 id="profile" tabindex="-1">Profile <a class="header-anchor" href="#profile" aria-label="Permalink to &quot;Profile&quot;">​</a></h2><h3 id="mac-xcode-instruments" tabindex="-1">Mac Xcode Instruments <a class="header-anchor" href="#mac-xcode-instruments" aria-label="Permalink to &quot;Mac Xcode Instruments&quot;">​</a></h3><p>Mac Xcode instruments can be used to produce a CPU profile.</p><p>To install Xcode Instruments, install the Command Line Tools:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">xcode-select</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--install</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">xcode-select</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--install</span></span></code></pre></div><p>For normal Rust builds, <a href="https://github.com/cmyr/cargo-instruments" target="_blank" rel="noreferrer"><code>cargo instruments</code></a> can be used as the glue for profiling and creating the trace file.</p><p>First, change the profile for showing debug symbols.</p><div class="language-toml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">toml</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">[</span><span style="color:#B392F0;">profile</span><span style="color:#E1E4E8;">.</span><span style="color:#B392F0;">release</span><span style="color:#E1E4E8;">]</span></span>
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data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_performance" data-v-30a5e70a><div><h1 id="performance-tuning" tabindex="-1">Performance Tuning <a class="header-anchor" href="#performance-tuning" aria-label="Permalink to &quot;Performance Tuning&quot;">​</a></h1><h2 id="compile-time" tabindex="-1">Compile Time <a class="header-anchor" href="#compile-time" aria-label="Permalink to &quot;Compile Time&quot;">​</a></h2><p>While Rust has gained a reputation for its comparatively slower compilation speed, we have dedicated significant effort to fine-tune the Rust compilation speed. Our aim is to minimize any impact on your development workflow, ensuring that developing your own Oxc based tools remains a smooth and efficient experience.</p><p>This is demonstrated by our <a href="https://github.com/oxc-project/oxc/actions/workflows/ci.yml?query=branch%3Amain" target="_blank" rel="noreferrer">CI runs</a>, where warm runs complete in 5 minutes.</p><h2 id="profile" tabindex="-1">Profile <a class="header-anchor" href="#profile" aria-label="Permalink to &quot;Profile&quot;">​</a></h2><h3 id="mac-xcode-instruments" tabindex="-1">Mac Xcode Instruments <a class="header-anchor" href="#mac-xcode-instruments" aria-label="Permalink to &quot;Mac Xcode Instruments&quot;">​</a></h3><p>Mac Xcode instruments can be used to produce a CPU profile.</p><p>To install Xcode Instruments, install the Command Line Tools:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">xcode-select</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--install</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">xcode-select</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--install</span></span></code></pre></div><p>For normal Rust builds, <a href="https://github.com/cmyr/cargo-instruments" target="_blank" rel="noreferrer"><code>cargo instruments</code></a> can be used as the glue for profiling and creating the trace file.</p><p>First, change the profile for showing debug symbols.</p><div class="language-toml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">toml</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">[</span><span style="color:#B392F0;">profile</span><span style="color:#E1E4E8;">.</span><span style="color:#B392F0;">release</span><span style="color:#E1E4E8;">]</span></span>
 <span class="line"><span style="color:#E1E4E8;">debug = </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;"># debug info with line tables only</span></span>
 <span class="line"><span style="color:#E1E4E8;">strip = </span><span style="color:#79B8FF;">false</span><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;"># do not strip symbols</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">[</span><span style="color:#6F42C1;">profile</span><span style="color:#24292E;">.</span><span style="color:#6F42C1;">release</span><span style="color:#24292E;">]</span></span>
 <span class="line"><span style="color:#24292E;">debug = </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> </span><span style="color:#6A737D;"># debug info with line tables only</span></span>
@@ -42,8 +42,8 @@
 <span class="line"><span style="color:#24292e;">Ctrl-C to stop the recording</span></span>
 <span class="line"><span style="color:#24292e;">Target app exited, ending recording...</span></span>
 <span class="line"><span style="color:#24292e;">Recording completed. Saving output file...</span></span>
-<span class="line"><span style="color:#24292e;">Output file saved as: Launch_oxlint_2023-09-03_4.41.45 PM_EB179B85.trace</span></span></code></pre></div><p>Open the trace file <code>open Launch_oxlint_2023-09-03_4.41.45\ PM_EB179B85.trace</code>.</p><p>To see a top down trace:</p><ol><li>On the top panel, click CPUs</li><li>On the left input box, click <code>x</code> then select <code>Time Profiler</code></li><li>At the bottom panel, click &quot;Call Tree&quot;, turn on &quot;Invert Call Tree&quot; and turn off separate by thread.</li></ol></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/performance.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/contribute/vscode.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>VSCode</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/contribute/showcase.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Showcase</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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+<span class="line"><span style="color:#24292e;">Output file saved as: Launch_oxlint_2023-09-03_4.41.45 PM_EB179B85.trace</span></span></code></pre></div><p>Open the trace file <code>open Launch_oxlint_2023-09-03_4.41.45\ PM_EB179B85.trace</code>.</p><p>To see a top down trace:</p><ol><li>On the top panel, click CPUs</li><li>On the left input box, click <code>x</code> then select <code>Time Profiler</code></li><li>At the bottom panel, click &quot;Call Tree&quot;, turn on &quot;Invert Call Tree&quot; and turn off separate by thread.</li></ol></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/performance.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/contribute/vscode.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>VSCode</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/contribute/showcase.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Showcase</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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However, it can often become a performance bottleneck. 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Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_vscode" data-v-30a5e70a><div><h1 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Build the extension and run it inside vscode:</p><ol><li><code>pnpm install</code></li><li><code>pnpm run build</code></li><li><code>pnpm run package</code></li><li>open vscode and run the command palette &quot;Extensions: Install from VSIX...&quot;</li><li>find the <code>oxc-vscode-x.x.x.vsix</code> file from <code>./editor/vscode</code> directory</li><li>open a <code>.js</code> / <code>.ts</code> file, add <code>debugger;</code> and save</li><li>see the warning <code>eslint(no-debugger): debugger statement is not allowed - oxc</code></li></ol></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/vscode.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path 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data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_contribute_vscode" data-v-30a5e70a><div><h1 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Build the extension and run it inside vscode:</p><ol><li><code>pnpm install</code></li><li><code>pnpm run build</code></li><li><code>pnpm run package</code></li><li>open vscode and run the command palette &quot;Extensions: Install from VSIX...&quot;</li><li>find the <code>oxc-vscode-x.x.x.vsix</code> file from <code>./editor/vscode</code> directory</li><li>open a <code>.js</code> / <code>.ts</code> file, add <code>debugger;</code> and save</li><li>see the warning <code>eslint(no-debugger): debugger statement is not allowed - oxc</code></li></ol></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/contribute/vscode.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path 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page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_guide_introduction" data-v-30a5e70a><div><h1 id="what-is-oxc" tabindex="-1">What is OXC? <a class="header-anchor" href="#what-is-oxc" aria-label="Permalink to &quot;What is OXC?&quot;">​</a></h1><p>The Oxidation Compiler is a collection of high-performance tools for the JavaScript and TypeScript language.</p><p>We are building a parser, linter, formatter, transpiler, minifier, resolver ... all written in Rust.</p><p>Our goal is to create and empower the fastest and most user friendly tools for <a href="https://www.swyx.io/js-third-age" target="_blank" rel="noreferrer">The Third Age of JavaScript</a>.</p><h2 id="philosophy" tabindex="-1">Philosophy <a class="header-anchor" href="#philosophy" aria-label="Permalink to &quot;Philosophy&quot;">​</a></h2><p>This project shares the same philosophies as <a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a> and <a href="https://beta.ruff.rs" target="_blank" rel="noreferrer">Ruff</a>.</p><ol><li>JavaScript tooling could be rewritten in a more performant language.</li><li>An integrated toolchain can tap into efficiencies that are not available to a disparate set of tools.</li></ol><h2 id="core-team" tabindex="-1">Core Team <a class="header-anchor" href="#core-team" aria-label="Permalink to &quot;Core Team&quot;">​</a></h2><div class="VPTeamMembers medium count-3" data-v-08f54381><div class="container" 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data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_guide_introduction" data-v-30a5e70a><div><h1 id="what-is-oxc" tabindex="-1">What is OXC? <a class="header-anchor" href="#what-is-oxc" aria-label="Permalink to &quot;What is OXC?&quot;">​</a></h1><p>The Oxidation Compiler is a collection of high-performance tools for the JavaScript and TypeScript language.</p><p>We are building a parser, linter, formatter, transpiler, minifier, resolver ... all written in Rust.</p><p>Our goal is to create and empower the fastest and most user friendly tools for <a href="https://www.swyx.io/js-third-age" target="_blank" rel="noreferrer">The Third Age of JavaScript</a>.</p><h2 id="philosophy" tabindex="-1">Philosophy <a class="header-anchor" href="#philosophy" aria-label="Permalink to &quot;Philosophy&quot;">​</a></h2><p>This project shares the same philosophies as <a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a> and <a href="https://beta.ruff.rs" target="_blank" rel="noreferrer">Ruff</a>.</p><ol><li>JavaScript tooling could be rewritten in a more performant language.</li><li>An integrated toolchain can tap into efficiencies that are not available to a disparate set of tools.</li></ol><h2 id="core-team" tabindex="-1">Core Team <a class="header-anchor" href="#core-team" aria-label="Permalink to &quot;Core Team&quot;">​</a></h2><div class="VPTeamMembers medium count-3" data-v-08f54381><div class="container" data-v-08f54381><!--[--><div class="item" data-v-08f54381><article class="VPTeamMembersItem medium" data-v-08f54381 data-v-7cfb1dae><div class="profile" data-v-7cfb1dae><figure class="avatar" data-v-7cfb1dae><img class="avatar-img" src="https://www.github.com/Boshen.png" alt="Boshen" data-v-7cfb1dae></figure><div 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class="item" role="button" tabindex="0" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><h2 class="text" data-v-1a4376dd>Getting Started</h2><!----></div><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/docs/guide/introduction.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Introduction</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/docs/guide/benchmarks.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Benchmarks</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-38384e3a><section class="VPSidebarItem level-0 has-active" data-v-38384e3a data-v-1a4376dd><div class="item" role="button" tabindex="0" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><h2 class="text" data-v-1a4376dd>Usage</h2><!----></div><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/docs/guide/usage/linter.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Linter</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/docs/guide/usage/parser.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Parser</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" 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aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_guide_usage_linter" data-v-30a5e70a><div><ul class="AppBadgeList" data-v-095e1027><!--[--><li class="badge" data-v-095e1027><img src="https://img.shields.io/npm/dw/oxlint" alt="npm" data-v-095e1027></li><li class="badge" data-v-095e1027><img src="https://img.shields.io/github/stars/oxc-project/oxc" alt="GitHub Repo stars" data-v-095e1027></li><!--]--></ul><h1 id="oxlint" tabindex="-1">oxlint <a class="header-anchor" href="#oxlint" aria-label="Permalink to &quot;oxlint&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>Runs 50-100x faster than ESLint, and scales with the number of CPU cores (<a href="https://github.com/oxc-project/bench-javascript-linter" target="_blank" rel="noreferrer">Benchmark</a>)</li><li>No configuration required</li><li>Convention over configuration</li><li>Reports errors and useless code by default</li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/ignore#the-eslintignore-file" target="_blank" rel="noreferrer">.eslintignore</a></li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/rules#disabling-rules" target="_blank" rel="noreferrer">ESLint comment disabling</a></li></ul><h2 id="adoptions" tabindex="-1">Adoptions <a class="header-anchor" href="#adoptions" aria-label="Permalink to &quot;Adoptions&quot;">​</a></h2><ul><li>A 5M LOC typescript codebase previously running ESLint parallelized across 48 workers in CI taking 75 mins (12m wall time), it is now 8 seconds on a single worker. (<a href="https://twitter.com/boshen_c/status/1714827365136929029" target="_blank" rel="noreferrer">Source</a>)</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><p>Install <a href="https://www.npmjs.com/package/oxlint" target="_blank" rel="noreferrer">oxlint</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-_hhsH" id="tab-6GppXzw" checked="checked"><label for="tab-6GppXzw">npm</label><input type="radio" name="group-_hhsH" id="tab-l5thYWt"><label for="tab-l5thYWt">pnpm</label><input type="radio" name="group-_hhsH" id="tab-TiucKSj"><label for="tab-TiucKSj">yarn</label><input type="radio" name="group-_hhsH" id="tab-dQsjuvO"><label for="tab-dQsjuvO">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div></div></div><p>You can also run oxlint directly:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Riy2d" id="tab-F4SY9pK" checked="checked"><label for="tab-F4SY9pK">npm</label><input type="radio" name="group-Riy2d" id="tab-lPaUQgL"><label for="tab-lPaUQgL">pnpm</label><input type="radio" name="group-Riy2d" id="tab-xXKwqqD"><label for="tab-xXKwqqD">yarn</label><input type="radio" name="group-Riy2d" id="tab-wuwk7gj"><label for="tab-wuwk7gj">bun</label><input type="radio" name="group-Riy2d" id="tab-w3ddpH_"><label for="tab-w3ddpH_">deno</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bunx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bunx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">deno</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">deno</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div></div></div><p>You can download the binary files from <a href="https://github.com/oxc-project/oxc/releases/latest" target="_blank" rel="noreferrer">the latest GitHub releases</a>.</p><h2 id="integration" tabindex="-1">Integration <a class="header-anchor" href="#integration" aria-label="Permalink to &quot;Integration&quot;">​</a></h2><h3 id="ides" tabindex="-1">IDEs <a class="header-anchor" href="#ides" aria-label="Permalink to &quot;IDEs&quot;">​</a></h3><h4 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h4><p>You can download <a href="https://marketplace.visualstudio.com/items?itemName=oxc.oxc-vscode" target="_blank" rel="noreferrer">the official VSCode extension</a>.</p><h4 id="vim-nvim-coc" tabindex="-1">Vim / Nvim (coc) <a class="header-anchor" href="#vim-nvim-coc" aria-label="Permalink to &quot;Vim / Nvim (coc)&quot;">​</a></h4><p>Add the following config to <code>coc-settings.json</code>:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">{</span></span>
+    <div id="app"><div class="Layout" data-v-8574ffd1><!--[--><!--]--><!--[--><span tabindex="-1" data-v-abdaa7b4></span><a href="#VPContent" class="VPSkipLink visually-hidden" data-v-abdaa7b4> Skip to content </a><!--]--><!----><header class="VPNav" data-v-8574ffd1 data-v-8d0376b3><div class="VPNavBar has-sidebar" data-v-8d0376b3 data-v-75295e80><div class="container" data-v-75295e80><div class="title" data-v-75295e80><div class="VPNavBarTitle has-sidebar" data-v-75295e80 data-v-25907968><a class="title" href="/" data-v-25907968><!--[--><!--]--><!--[--><img class="VPImage logo" src="https://raw.githubusercontent.com/oxc-project/oxc-assets/main/logo-round.png" alt data-v-b7111cdf><!--]--><!--[-->OXC<!--]--><!--[--><!--]--></a></div></div><div class="content" data-v-75295e80><div class="curtain" data-v-75295e80></div><div class="content-body" data-v-75295e80><!--[--><!--]--><div class="VPNavBarSearch search" data-v-75295e80><!--[--><!----><div id="local-search"><button type="button" 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data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_guide_usage_linter" data-v-30a5e70a><div><ul class="AppBadgeList" data-v-095e1027><!--[--><li class="badge" data-v-095e1027><img src="https://img.shields.io/npm/dw/oxlint" alt="npm" data-v-095e1027></li><li class="badge" data-v-095e1027><img src="https://img.shields.io/github/stars/oxc-project/oxc" alt="GitHub Repo stars" data-v-095e1027></li><!--]--></ul><h1 id="oxlint" tabindex="-1">oxlint <a class="header-anchor" href="#oxlint" aria-label="Permalink to &quot;oxlint&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>Runs 50-100x faster than ESLint, and scales with the number of CPU cores (<a href="https://github.com/oxc-project/bench-javascript-linter" target="_blank" rel="noreferrer">Benchmark</a>)</li><li>No configuration required</li><li>Convention over configuration</li><li>Reports errors and useless code by default</li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/ignore#the-eslintignore-file" target="_blank" rel="noreferrer">.eslintignore</a></li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/rules#disabling-rules" target="_blank" rel="noreferrer">ESLint comment disabling</a></li></ul><h2 id="adoptions" tabindex="-1">Adoptions <a class="header-anchor" href="#adoptions" aria-label="Permalink to &quot;Adoptions&quot;">​</a></h2><ul><li>A 5M LOC typescript codebase previously running ESLint parallelized across 48 workers in CI taking 75 mins (12m wall time), it is now 8 seconds on a single worker. (<a href="https://twitter.com/boshen_c/status/1714827365136929029" target="_blank" rel="noreferrer">Source</a>)</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><p>Install <a href="https://www.npmjs.com/package/oxlint" target="_blank" rel="noreferrer">oxlint</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group--BL5E" id="tab-gbbDrBZ" checked="checked"><label for="tab-gbbDrBZ">npm</label><input type="radio" name="group--BL5E" id="tab-fv_5etY"><label for="tab-fv_5etY">pnpm</label><input type="radio" name="group--BL5E" id="tab-4Hkdl67"><label for="tab-4Hkdl67">yarn</label><input type="radio" name="group--BL5E" id="tab-nVz4bes"><label for="tab-nVz4bes">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div></div></div><p>You can also run oxlint directly:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-CAB58" id="tab-ooZdjBP" checked="checked"><label for="tab-ooZdjBP">npm</label><input type="radio" name="group-CAB58" id="tab-ASCwe8-"><label for="tab-ASCwe8-">pnpm</label><input type="radio" name="group-CAB58" id="tab-SCuVYYO"><label for="tab-SCuVYYO">yarn</label><input type="radio" name="group-CAB58" id="tab-DlKUPmn"><label for="tab-DlKUPmn">bun</label><input type="radio" name="group-CAB58" id="tab-UBDTJVK"><label for="tab-UBDTJVK">deno</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bunx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bunx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">deno</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">deno</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div></div></div><p>You can download the binary files from <a href="https://github.com/oxc-project/oxc/releases/latest" target="_blank" rel="noreferrer">the latest GitHub releases</a>.</p><h2 id="integration" tabindex="-1">Integration <a class="header-anchor" href="#integration" aria-label="Permalink to &quot;Integration&quot;">​</a></h2><h3 id="ides" tabindex="-1">IDEs <a class="header-anchor" href="#ides" aria-label="Permalink to &quot;IDEs&quot;">​</a></h3><h4 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h4><p>You can download <a href="https://marketplace.visualstudio.com/items?itemName=oxc.oxc-vscode" target="_blank" rel="noreferrer">the official VSCode extension</a>.</p><h4 id="vim-nvim-coc" tabindex="-1">Vim / Nvim (coc) <a class="header-anchor" href="#vim-nvim-coc" aria-label="Permalink to &quot;Vim / Nvim (coc)&quot;">​</a></h4><p>Add the following config to <code>coc-settings.json</code>:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">{</span></span>
 <span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#9ECBFF;">&quot;languageserver&quot;</span><span style="color:#E1E4E8;">: {</span></span>
 <span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#9ECBFF;">&quot;oxc&quot;</span><span style="color:#E1E4E8;">: {</span></span>
 <span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#9ECBFF;">&quot;command&quot;</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">&quot;oxc_vscode&quot;</span><span style="color:#E1E4E8;">,</span></span>
@@ -106,8 +106,8 @@
 <span class="line"><span style="color:#24292e;">    PATH                      Single file, single path or list of paths</span></span>
 <span class="line"><span style="color:#24292e;"></span></span>
 <span class="line"><span style="color:#24292e;">Available options:</span></span>
-<span class="line"><span style="color:#24292e;">    -h, --help                Prints help information</span></span></code></pre></div></li></ul><h2 id="system-requirements" tabindex="-1">System Requirements <a class="header-anchor" href="#system-requirements" aria-label="Permalink to &quot;System Requirements&quot;">​</a></h2><p><code>oxlint</code> is built for the following systems:</p><ul><li>darwin-arm64</li><li>darwin-x64</li><li>linux-arm64</li><li>linux-x64</li><li>win32-arm64</li><li>win32-x64</li></ul></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/guide/usage/linter.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/guide/benchmarks.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Benchmarks</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/guide/usage/parser.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Parser</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
-    <script>window.__VP_HASH_MAP__=JSON.parse("{\"docs_contribute_showcase.md\":\"04c27e6a\",\"docs_contribute_vscode.md\":\"dfac2403\",\"docs_contribute_transformer.md\":\"d026b587\",\"docs_learn_ecosystem.md\":\"8c414ce3\",\"docs_learn_ecmascript_spec.md\":\"03200411\",\"docs_guide_benchmarks.md\":\"426cf9b1\",\"index.md\":\"b39570fc\",\"blog_index.md\":\"a20bd3b9\",\"docs_learn_architecture_linter.md\":\"12e3a00b\",\"docs_learn_ecmascript_grammar.md\":\"e9677e24\",\"docs_learn_architecture_resolver.md\":\"06afd529\",\"docs_contribute_introduction.md\":\"b8b3797b\",\"docs_guide_philosophy.md\":\"d9540af9\",\"docs_contribute_codegen.md\":\"038d4799\",\"docs_learn_architecture_formatter.md\":\"80783d23\",\"docs_learn_architecture_minifier.md\":\"bc5e2ca4\",\"blog_2022-02-10-js-tooling-research.md\":\"e5bf29cc\",\"docs_guide_usage_resolver.md\":\"60e2e81f\",\"docs_contribute_resolver.md\":\"668d9bbb\",\"docs_contribute_prettier.md\":\"ed67e286\",\"blog_2023-11-08-announcing-oxlint.md\":\"706d95fb\",\"docs_guide_usage_parser.md\":\"a90d6882\",\"docs_guide_usage_benchmarks.md\":\"cf30d29b\",\"docs_learn_architecture_transformer.md\":\"8a48936b\",\"docs_guide_usage_linter.md\":\"be302645\",\"docs_contribute_linter.md\":\"b1685e29\",\"docs_guide_introduction.md\":\"138c6418\",\"docs_learn_performance.md\":\"5eb36f6e\",\"docs_learn_architecture_introduction.md\":\"da9ddefa\",\"docs_learn_references.md\":\"ff70791a\",\"blog_2023-11-07-announcing-oxc.md\":\"3a2f4a1d\",\"blog_2022-08-08-linter-research.md\":\"7364aab2\",\"docs_contribute_performance.md\":\"32708dc6\",\"docs_contribute_parser.md\":\"dea12757\",\"docs_contribute_formatter.md\":\"c3e52bdc\",\"docs_contribute_development.md\":\"260bd01b\",\"docs_learn_architecture_parser.md\":\"4ee292fb\",\"docs_contribute_minifier.md\":\"8673c15a\",\"docs_guide_usage_philosophy.md\":\"7fb423b5\"}");window.__VP_SITE_DATA__=JSON.parse("{\"lang\":\"en-US\",\"dir\":\"ltr\",\"title\":\"The 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+<span class="line"><span style="color:#24292e;">    -h, --help                Prints help information</span></span></code></pre></div></li></ul><h2 id="system-requirements" tabindex="-1">System Requirements <a class="header-anchor" href="#system-requirements" aria-label="Permalink to &quot;System Requirements&quot;">​</a></h2><p><code>oxlint</code> is built for the following systems:</p><ul><li>darwin-arm64</li><li>darwin-x64</li><li>linux-arm64</li><li>linux-x64</li><li>win32-arm64</li><li>win32-x64</li></ul></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/guide/usage/linter.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/guide/benchmarks.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Benchmarks</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/guide/usage/parser.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Parser</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_guide_usage_parser" data-v-30a5e70a><div><ul class="AppBadgeList" data-v-095e1027><!--[--><li class="badge" data-v-095e1027><img src="https://img.shields.io/npm/dw/oxc-parser" alt="npm" data-v-095e1027></li><!--]--></ul><h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>2x faster then <a href="https://swc.rs" target="_blank" rel="noreferrer">SWC</a> parser</li><li>By far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust</li></ul><p>You can check <a href="https://github.com/oxc-project/bench-javascript-parser-written-in-rust" target="_blank" rel="noreferrer">benchmark</a> for more detail.</p><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install crates:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_ast</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_ast</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_parser</span></span></code></pre></div><ul><li>The umbrella crate <a href="https://docs.rs/oxc" target="_blank" rel="noreferrer">oxc</a> exports all public crates from this repository</li><li>The AST and parser crates <a href="https://docs.rs/oxc_ast" target="_blank" rel="noreferrer">oxc_ast</a> and <a href="https://docs.rs/oxc_parser" target="_blank" rel="noreferrer">oxc_parser</a> are production ready</li></ul><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-parser" target="_blank" rel="noreferrer">oxc-parser</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-FcJNA" id="tab-52jy92S" checked="checked"><label for="tab-52jy92S">npm</label><input type="radio" name="group-FcJNA" id="tab-b07dXS3"><label for="tab-b07dXS3">pnpm</label><input type="radio" name="group-FcJNA" id="tab-NRdCGvg"><label for="tab-NRdCGvg">yarn</label><input type="radio" name="group-FcJNA" id="tab-gseGihw"><label for="tab-gseGihw">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/guide/usage/parser.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" 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data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_guide_usage_parser" data-v-30a5e70a><div><ul class="AppBadgeList" data-v-095e1027><!--[--><li class="badge" data-v-095e1027><img src="https://img.shields.io/npm/dw/oxc-parser" alt="npm" data-v-095e1027></li><!--]--></ul><h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>2x faster then <a href="https://swc.rs" target="_blank" rel="noreferrer">SWC</a> parser</li><li>By far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust</li></ul><p>You can check <a href="https://github.com/oxc-project/bench-javascript-parser-written-in-rust" target="_blank" rel="noreferrer">benchmark</a> for more detail.</p><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install crates:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_ast</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_ast</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_parser</span></span></code></pre></div><ul><li>The umbrella crate <a href="https://docs.rs/oxc" target="_blank" rel="noreferrer">oxc</a> exports all public crates from this repository</li><li>The AST and parser crates <a href="https://docs.rs/oxc_ast" target="_blank" rel="noreferrer">oxc_ast</a> and <a href="https://docs.rs/oxc_parser" target="_blank" rel="noreferrer">oxc_parser</a> are production ready</li></ul><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-parser" target="_blank" rel="noreferrer">oxc-parser</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-zr1Qn" id="tab-nFZbvPz" checked="checked"><label for="tab-nFZbvPz">npm</label><input type="radio" name="group-zr1Qn" id="tab-zlWuI9t"><label for="tab-zlWuI9t">pnpm</label><input type="radio" name="group-zr1Qn" id="tab-XVilwKA"><label for="tab-XVilwKA">yarn</label><input type="radio" name="group-zr1Qn" id="tab-JpiTRod"><label for="tab-JpiTRod">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/guide/usage/parser.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path 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aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_guide_usage_resolver" data-v-30a5e70a><div><ul class="AppBadgeList" data-v-095e1027><!--[--><li class="badge" data-v-095e1027><img src="https://img.shields.io/npm/dw/oxc-resolver" alt="npm" data-v-095e1027></li><!--]--></ul><h1 id="resolver" tabindex="-1">Resolver <a class="header-anchor" href="#resolver" aria-label="Permalink to &quot;Resolver&quot;">​</a></h1><p>Node.js Module Resolution.</p><ul><li>Feature complete</li><li>All configuration options are aligned with enhanced-resolve</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install <a href="https://crates.io/oxc_resolver" target="_blank" rel="noreferrer">oxc_resolver</a> crate:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_resolver</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_resolver</span></span></code></pre></div><p>You should also check <a href="https://docs.rs/oxc_resolver" target="_blank" rel="noreferrer">documentation</a>.</p><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-resolver" target="_blank" rel="noreferrer">oxc-resolver</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Us1dm" id="tab-Vh13kih" checked="checked"><label for="tab-Vh13kih">npm</label><input type="radio" name="group-Us1dm" id="tab-JCEcXHz"><label for="tab-JCEcXHz">pnpm</label><input type="radio" name="group-Us1dm" id="tab-CMxSnfk"><label for="tab-CMxSnfk">yarn</label><input type="radio" name="group-Us1dm" id="tab-G-K99LS"><label for="tab-G-K99LS">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div><h2 id="example" tabindex="-1">Example <a class="header-anchor" href="#example" aria-label="Permalink to &quot;Example&quot;">​</a></h2><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{env, </span><span style="color:#B392F0;">path</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">PathBuf</span><span style="color:#E1E4E8;">};</span></span>
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data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_guide_usage_resolver" data-v-30a5e70a><div><ul class="AppBadgeList" data-v-095e1027><!--[--><li class="badge" data-v-095e1027><img src="https://img.shields.io/npm/dw/oxc-resolver" alt="npm" data-v-095e1027></li><!--]--></ul><h1 id="resolver" tabindex="-1">Resolver <a class="header-anchor" href="#resolver" aria-label="Permalink to &quot;Resolver&quot;">​</a></h1><p>Node.js Module Resolution.</p><ul><li>Feature complete</li><li>All configuration options are aligned with enhanced-resolve</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install <a href="https://crates.io/oxc_resolver" target="_blank" rel="noreferrer">oxc_resolver</a> crate:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_resolver</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_resolver</span></span></code></pre></div><p>You should also check <a href="https://docs.rs/oxc_resolver" target="_blank" rel="noreferrer">documentation</a>.</p><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-resolver" target="_blank" rel="noreferrer">oxc-resolver</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Wp9DI" id="tab-_x4twk3" checked="checked"><label for="tab-_x4twk3">npm</label><input type="radio" name="group-Wp9DI" id="tab-gvFGXZ3"><label for="tab-gvFGXZ3">pnpm</label><input type="radio" name="group-Wp9DI" id="tab-HMIFqif"><label for="tab-HMIFqif">yarn</label><input type="radio" name="group-Wp9DI" id="tab-z72l28Z"><label for="tab-z72l28Z">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div><h2 id="example" tabindex="-1">Example <a class="header-anchor" href="#example" aria-label="Permalink to &quot;Example&quot;">​</a></h2><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{env, </span><span style="color:#B392F0;">path</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">PathBuf</span><span style="color:#E1E4E8;">};</span></span>
 <span class="line"></span>
 <span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">oxc_resolver</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{</span><span style="color:#B392F0;">ResolveOptions</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">Resolver</span><span style="color:#E1E4E8;">};</span></span>
 <span class="line"></span>
@@ -62,8 +62,8 @@
 <span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Err</span><span style="color:#24292E;">(error) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;Error: {error}&quot;</span><span style="color:#24292E;">),</span></span>
 <span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Ok</span><span style="color:#24292E;">(resolution) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;Resolved: {}&quot;</span><span style="color:#24292E;">, resolution</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">full_path</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">to_string_lossy</span><span style="color:#24292E;">()),</span></span>
 <span class="line"><span style="color:#24292E;">    }</span></span>
-<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/guide/usage/resolver.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/guide/usage/parser.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Parser</span></a></div><div class="pager" data-v-c097fc16><!----></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_architecture_parser" data-v-30a5e70a><div><h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>Oxc maintains its own AST and parser, which is by far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust.</p><p>As the parser often represents a key performance bottleneck in JavaScript tooling, any minor improvements can have a cascading effect on our downstream tools. By developing our parser, we have the opportunity to explore and implement well-researched performance techniques.</p><p>While many existing JavaScript tools rely on [estree] as their AST specification, a notable drawback is its abundance of ambiguous nodes. This ambiguity often leads to confusion during development with [estree].</p><p>The Oxc AST differs slightly from the [estree] AST by removing ambiguous nodes and introducing distinct types. For example, instead of using a generic [estree] <code>Identifier</code>, the Oxc AST provides specific types such as <code>BindingIdentifier</code>, <code>IdentifierReference</code>, and <code>IdentifierName</code>.</p><p>This clear distinction greatly enhances the development experience by aligning more closely with the ECMAScript specification.</p><h2 id="how-is-it-so-fast" tabindex="-1">How is it so fast <a class="header-anchor" href="#how-is-it-so-fast" aria-label="Permalink to &quot;How is it so fast&quot;">​</a></h2><ul><li>AST is allocated in a <a href="https://crates.io/crates/bumpalo" target="_blank" rel="noreferrer">memory arena</a> for fast AST memory allocation and deallocation</li><li>Short strings are inlined by <a href="https://crates.io/crates/compact_str" target="_blank" rel="noreferrer">CompactString</a></li><li>No other heap allocations are done except the above two</li><li>Scope binding, symbol resolution and some syntax errors are not done in the parser, they are delegated to the semantic analyzer</li></ul></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/architecture/parser.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/architecture/introduction.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Introduction</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/architecture/linter.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Linter</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_architecture_parser" data-v-30a5e70a><div><h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>Oxc maintains its own AST and parser, which is by far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust.</p><p>As the parser often represents a key performance bottleneck in JavaScript tooling, any minor improvements can have a cascading effect on our downstream tools. By developing our parser, we have the opportunity to explore and implement well-researched performance techniques.</p><p>While many existing JavaScript tools rely on [estree] as their AST specification, a notable drawback is its abundance of ambiguous nodes. This ambiguity often leads to confusion during development with [estree].</p><p>The Oxc AST differs slightly from the [estree] AST by removing ambiguous nodes and introducing distinct types. For example, instead of using a generic [estree] <code>Identifier</code>, the Oxc AST provides specific types such as <code>BindingIdentifier</code>, <code>IdentifierReference</code>, and <code>IdentifierName</code>.</p><p>This clear distinction greatly enhances the development experience by aligning more closely with the ECMAScript specification.</p><h2 id="how-is-it-so-fast" tabindex="-1">How is it so fast <a class="header-anchor" href="#how-is-it-so-fast" aria-label="Permalink to &quot;How is it so fast&quot;">​</a></h2><ul><li>AST is allocated in a <a href="https://crates.io/crates/bumpalo" target="_blank" rel="noreferrer">memory arena</a> for fast AST memory allocation and deallocation</li><li>Short strings are inlined by <a href="https://crates.io/crates/compact_str" target="_blank" rel="noreferrer">CompactString</a></li><li>No other heap allocations are done except the above two</li><li>Scope binding, symbol resolution and some syntax errors are not done in the parser, they are delegated to the semantic analyzer</li></ul></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/architecture/parser.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/architecture/introduction.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Introduction</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/architecture/linter.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Linter</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_ecmascript_grammar" data-v-30a5e70a><div><p>JavaScript has one of the most challenging grammar to parse, this tutorial details all the sweat and tears I had while learning it.</p><h2 id="ll-1-grammar" tabindex="-1">LL(1) Grammar <a class="header-anchor" href="#ll-1-grammar" aria-label="Permalink to &quot;LL(1) Grammar&quot;">​</a></h2><p>According to <a href="https://en.wikipedia.org/wiki/LL_grammar" target="_blank" rel="noreferrer">Wikipedia</a>,</p><blockquote><p>an LL grammar is a context-free grammar that can be parsed by an LL parser, which parses the input from Left to right</p></blockquote><p>The first <strong>L</strong> means the scanning the source from <strong>L</strong>eft to right, and the second <strong>L</strong> means the construction of a <strong>L</strong>eftmost derivation tree.</p><p>Context-free and the (1) in LL(1) means a tree can be constructed by just peeking at the next token and nothing else.</p><p>LL Grammars are of particular interest in academia because we are lazy human beings and we want to write programs that generate parsers automatically so we don&#39;t need to write parsers by hand.</p><p>Unfortunately, most industrial programming languages do not have a nice LL(1) grammar, and this applies to JavaScript too.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>Mozilla started the <a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a> project a few years ago and wrote a <a href="https://github.com/mozilla-spidermonkey/jsparagus/tree/master/jsparagus" target="_blank" rel="noreferrer">LALR parser generator in Python</a>. They haven&#39;t updated it much in the past two years and they sent a strong message at the end of <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">js-quirks.md</a></p><blockquote><p>What have we learned today?</p><ul><li>Do not write a JS parser.</li><li>JavaScript has some syntactic horrors in it. But hey, you don&#39;t make the world&#39;s most widely used programming language by avoiding all mistakes. You do it by shipping a serviceable tool, in the right circumstances, for the right users.</li></ul></blockquote></div><hr><p>The only practical way to parse JavaScript is to write a recursive descent parser by hand because of the nature of its grammar, so let&#39;s learn all the quirks in the grammar before we shoot ourselves in the foot.</p><p>The list below starts simple and will become difficult to grasp, so please take grab a coffee and take your time.</p><h2 id="identifiers" tabindex="-1">Identifiers <a class="header-anchor" href="#identifiers" aria-label="Permalink to &quot;Identifiers&quot;">​</a></h2><p>There are three types of identifiers defined in <code>#sec-identifiers</code>,</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">IdentifierReference[Yield, Await] :</span></span>
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role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_ecmascript_grammar" data-v-30a5e70a><div><p>JavaScript has one of the most challenging grammar to parse, this tutorial details all the sweat and tears I had while learning it.</p><h2 id="ll-1-grammar" tabindex="-1">LL(1) Grammar <a class="header-anchor" href="#ll-1-grammar" aria-label="Permalink to &quot;LL(1) Grammar&quot;">​</a></h2><p>According to <a href="https://en.wikipedia.org/wiki/LL_grammar" target="_blank" rel="noreferrer">Wikipedia</a>,</p><blockquote><p>an LL grammar is a context-free grammar that can be parsed by an LL parser, which parses the input from Left to right</p></blockquote><p>The first <strong>L</strong> means the scanning the source from <strong>L</strong>eft to right, and the second <strong>L</strong> means the construction of a <strong>L</strong>eftmost derivation tree.</p><p>Context-free and the (1) in LL(1) means a tree can be constructed by just peeking at the next token and nothing else.</p><p>LL Grammars are of particular interest in academia because we are lazy human beings and we want to write programs that generate parsers automatically so we don&#39;t need to write parsers by hand.</p><p>Unfortunately, most industrial programming languages do not have a nice LL(1) grammar, and this applies to JavaScript too.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>Mozilla started the <a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a> project a few years ago and wrote a <a href="https://github.com/mozilla-spidermonkey/jsparagus/tree/master/jsparagus" target="_blank" rel="noreferrer">LALR parser generator in Python</a>. They haven&#39;t updated it much in the past two years and they sent a strong message at the end of <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">js-quirks.md</a></p><blockquote><p>What have we learned today?</p><ul><li>Do not write a JS parser.</li><li>JavaScript has some syntactic horrors in it. But hey, you don&#39;t make the world&#39;s most widely used programming language by avoiding all mistakes. You do it by shipping a serviceable tool, in the right circumstances, for the right users.</li></ul></blockquote></div><hr><p>The only practical way to parse JavaScript is to write a recursive descent parser by hand because of the nature of its grammar, so let&#39;s learn all the quirks in the grammar before we shoot ourselves in the foot.</p><p>The list below starts simple and will become difficult to grasp, so please take grab a coffee and take your time.</p><h2 id="identifiers" tabindex="-1">Identifiers <a class="header-anchor" href="#identifiers" aria-label="Permalink to &quot;Identifiers&quot;">​</a></h2><p>There are three types of identifiers defined in <code>#sec-identifiers</code>,</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">IdentifierReference[Yield, Await] :</span></span>
 <span class="line"><span style="color:#e1e4e8;">BindingIdentifier[Yield, Await] :</span></span>
 <span class="line"><span style="color:#e1e4e8;">LabelIdentifier[Yield, Await] :</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">IdentifierReference[Yield, Await] :</span></span>
 <span class="line"><span style="color:#24292e;">BindingIdentifier[Yield, Await] :</span></span>
@@ -430,8 +430,8 @@
 <span class="line"><span style="color:#24292e;">If LeftHandSideExpression is an ObjectLiteral or an ArrayLiteral, the following Early Error rules are applied:</span></span>
 <span class="line"><span style="color:#24292e;">    * LeftHandSideExpression must cover an AssignmentPattern.</span></span></code></pre></div><p>These definitions define:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">({ prop </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> value } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> {}); </span><span style="color:#6A737D;">// ObjectAssignmentPattern</span></span>
 <span class="line"><span style="color:#E1E4E8;">({ prop </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> value }); </span><span style="color:#6A737D;">// ObjectLiteral with SyntaxError</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">({ prop </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> value } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> {}); </span><span style="color:#6A737D;">// ObjectAssignmentPattern</span></span>
-<span class="line"><span style="color:#24292E;">({ prop </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> value }); </span><span style="color:#6A737D;">// ObjectLiteral with SyntaxError</span></span></code></pre></div><p>Parsers need to parse <code>ObjectLiteral</code> with <code>CoverInitializedName</code>, and throw the syntax error if it does not reach <code>=</code> for <code>ObjectAssignmentPattern</code>.</p><p>As an exercise, which one of the following <code>=</code> should throw a syntax error?</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> }</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> }</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/ecmascript/grammar.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/ecmascript/spec.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Spec</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/performance.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Performance</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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+<span class="line"><span style="color:#24292E;">({ prop </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> value }); </span><span style="color:#6A737D;">// ObjectLiteral with SyntaxError</span></span></code></pre></div><p>Parsers need to parse <code>ObjectLiteral</code> with <code>CoverInitializedName</code>, and throw the syntax error if it does not reach <code>=</code> for <code>ObjectAssignmentPattern</code>.</p><p>As an exercise, which one of the following <code>=</code> should throw a syntax error?</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> }</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> }</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/ecmascript/grammar.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/ecmascript/spec.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Spec</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/performance.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Performance</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_ecmascript_spec" data-v-30a5e70a><div><p><a href="https://tc39.es/ecma262/" target="_blank" rel="noreferrer">The ECMAScript® 2023 Language Specification</a> details everything about the JavaScript language, so anyone can implement their own JavaScript engine.</p><p>The following chapters need to be studied for our parser:</p><ul><li>Chapter 5: Notational Conventions</li><li>Chapter 11: ECMAScript Language: Source Text</li><li>Chapter 12: ECMAScript Language: Lexical Grammar</li><li>Chapter 13 - 16: Expressions, Statements, Functions, Classes, Scripts and Modules</li><li>Annex B: Additional ECMAScript Features for Web Browsers</li><li>Annex C: The Strict Mode of ECMAScript</li></ul><p>For navigation inside the specification:</p><ul><li>Anything clickable has a permanent link, they are shown on the URL as anchors, for example <code>#sec-identifiers</code></li><li>Hovering over things may show a tooltip, clicking on <code>References</code> shows all its references</li></ul><h2 id="notational-conventions" tabindex="-1">Notational Conventions <a class="header-anchor" href="#notational-conventions" aria-label="Permalink to &quot;Notational Conventions&quot;">​</a></h2><p><a href="https://tc39.es/ecma262/#sec-grammar-notation" target="_blank" rel="noreferrer">Chapter 5.1.5 Grammar Notation</a> is the section we need to read.</p><p>The things to note here are:</p><h3 id="recursion" tabindex="-1">Recursion <a class="header-anchor" href="#recursion" aria-label="Permalink to &quot;Recursion&quot;">​</a></h3><p>This is how lists are presented in the grammar.</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ArgumentList :</span></span>
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role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_ecmascript_spec" data-v-30a5e70a><div><p><a href="https://tc39.es/ecma262/" target="_blank" rel="noreferrer">The ECMAScript® 2023 Language Specification</a> details everything about the JavaScript language, so anyone can implement their own JavaScript engine.</p><p>The following chapters need to be studied for our parser:</p><ul><li>Chapter 5: Notational Conventions</li><li>Chapter 11: ECMAScript Language: Source Text</li><li>Chapter 12: ECMAScript Language: Lexical Grammar</li><li>Chapter 13 - 16: Expressions, Statements, Functions, Classes, Scripts and Modules</li><li>Annex B: Additional ECMAScript Features for Web Browsers</li><li>Annex C: The Strict Mode of ECMAScript</li></ul><p>For navigation inside the specification:</p><ul><li>Anything clickable has a permanent link, they are shown on the URL as anchors, for example <code>#sec-identifiers</code></li><li>Hovering over things may show a tooltip, clicking on <code>References</code> shows all its references</li></ul><h2 id="notational-conventions" tabindex="-1">Notational Conventions <a class="header-anchor" href="#notational-conventions" aria-label="Permalink to &quot;Notational Conventions&quot;">​</a></h2><p><a href="https://tc39.es/ecma262/#sec-grammar-notation" target="_blank" rel="noreferrer">Chapter 5.1.5 Grammar Notation</a> is the section we need to read.</p><p>The things to note here are:</p><h3 id="recursion" tabindex="-1">Recursion <a class="header-anchor" href="#recursion" aria-label="Permalink to &quot;Recursion&quot;">​</a></h3><p>This is how lists are presented in the grammar.</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ArgumentList :</span></span>
 <span class="line"><span style="color:#e1e4e8;">  AssignmentExpression</span></span>
 <span class="line"><span style="color:#e1e4e8;">  ArgumentList , AssignmentExpression</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ArgumentList :</span></span>
 <span class="line"><span style="color:#24292e;">  AssignmentExpression</span></span>
@@ -86,8 +86,8 @@
 <span class="line"><span style="color:#6A737D;">        // highlight-next-line</span></span>
 <span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">asi</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">?</span><span style="color:#24292E;">;</span></span>
 <span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">ast</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">debugger_statement</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">finish_node</span><span style="color:#24292E;">(node))</span></span>
-<span class="line"><span style="color:#24292E;">    }</span></span></code></pre></div><div class="info custom-block"><p class="custom-block-title">INFO</p><p>This section on asi is written with a parser in mind, it explicitly states that the source text is parsed from left to right, which makes it almost impossible to write the parser in any other way. The author of jsparagus made a rant about this <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md#automatic-semicolon-insertion-" target="_blank" rel="noreferrer">here</a>.</p><blockquote><p>The specification for this feature is both very-high-level and weirdly procedural (“When, as the source text is parsed from left to right, a token is encountered...”, as if the specification is telling a story about a browser. As far as I know, this is the only place in the spec where anything is assumed or implied about the internal implementation details of parsing.) But it would be hard to specify ASI any other way.</p></blockquote></div><h2 id="expressions-statements-functions-classes-scripts-and-modules" tabindex="-1">Expressions, Statements, Functions, Classes, Scripts and Modules <a class="header-anchor" href="#expressions-statements-functions-classes-scripts-and-modules" aria-label="Permalink to &quot;Expressions, Statements, Functions, Classes, Scripts and Modules&quot;">​</a></h2><p>It takes a while to understand the syntactic grammar, then apply them to writing a parser.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/ecmascript/spec.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/architecture/minifier.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Minifier</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/ecmascript/grammar.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Grammar</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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+<span class="line"><span style="color:#24292E;">    }</span></span></code></pre></div><div class="info custom-block"><p class="custom-block-title">INFO</p><p>This section on asi is written with a parser in mind, it explicitly states that the source text is parsed from left to right, which makes it almost impossible to write the parser in any other way. The author of jsparagus made a rant about this <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md#automatic-semicolon-insertion-" target="_blank" rel="noreferrer">here</a>.</p><blockquote><p>The specification for this feature is both very-high-level and weirdly procedural (“When, as the source text is parsed from left to right, a token is encountered...”, as if the specification is telling a story about a browser. As far as I know, this is the only place in the spec where anything is assumed or implied about the internal implementation details of parsing.) But it would be hard to specify ASI any other way.</p></blockquote></div><h2 id="expressions-statements-functions-classes-scripts-and-modules" tabindex="-1">Expressions, Statements, Functions, Classes, Scripts and Modules <a class="header-anchor" href="#expressions-statements-functions-classes-scripts-and-modules" aria-label="Permalink to &quot;Expressions, Statements, Functions, Classes, Scripts and Modules&quot;">​</a></h2><p>It takes a while to understand the syntactic grammar, then apply them to writing a parser.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/ecmascript/spec.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/architecture/minifier.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Minifier</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/ecmascript/grammar.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Grammar</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_ecosystem" data-v-30a5e70a><div><p>Contributing to oxc will benefit the whole frontend development community. It would be a great pleasure if you could join as well.</p><p>We are being integrated into:</p><h2 id="rspack" tabindex="-1"><a href="https://www.rspack.dev" target="_blank" rel="noreferrer">Rspack</a> <a class="header-anchor" href="#rspack" aria-label="Permalink to &quot;[Rspack](https://www.rspack.dev)&quot;">​</a></h2><p>A fast Rust-based web bundler.</p><h2 id="rolldown" tabindex="-1">Rolldown <a class="header-anchor" href="#rolldown" aria-label="Permalink to &quot;Rolldown&quot;">​</a></h2><p>To be announced.</p><h2 id="ezno-type-checker" tabindex="-1"><a href="https://github.com/kaleidawave/ezno" target="_blank" rel="noreferrer">Ezno Type Checker</a> <a class="header-anchor" href="#ezno-type-checker" aria-label="Permalink to &quot;[Ezno Type Checker](https://github.com/kaleidawave/ezno)&quot;">​</a></h2><p>A JavaScript compiler and TypeScript checker written in Rust with a focus on static analysis and runtime performance.</p><h2 id="tyvm" tabindex="-1"><a href="https://github.com/zackradisic/tyvm" target="_blank" rel="noreferrer">Tyvm</a> <a class="header-anchor" href="#tyvm" aria-label="Permalink to &quot;[Tyvm](https://github.com/zackradisic/tyvm)&quot;">​</a></h2><p>An experimental bytecode interpreter for type-level Typescript.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/ecosystem.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/performance.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Performance</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/references.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>References</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Ecosystem</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/docs/learn/references.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>References</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_ecosystem" data-v-30a5e70a><div><p>Contributing to oxc will benefit the whole frontend development community. It would be a great pleasure if you could join as well.</p><p>We are being integrated into:</p><h2 id="rspack" tabindex="-1"><a href="https://www.rspack.dev" target="_blank" rel="noreferrer">Rspack</a> <a class="header-anchor" href="#rspack" aria-label="Permalink to &quot;[Rspack](https://www.rspack.dev)&quot;">​</a></h2><p>A fast Rust-based web bundler.</p><h2 id="rolldown" tabindex="-1">Rolldown <a class="header-anchor" href="#rolldown" aria-label="Permalink to &quot;Rolldown&quot;">​</a></h2><p>To be announced.</p><h2 id="ezno-type-checker" tabindex="-1"><a href="https://github.com/kaleidawave/ezno" target="_blank" rel="noreferrer">Ezno Type Checker</a> <a class="header-anchor" href="#ezno-type-checker" aria-label="Permalink to &quot;[Ezno Type Checker](https://github.com/kaleidawave/ezno)&quot;">​</a></h2><p>A JavaScript compiler and TypeScript checker written in Rust with a focus on static analysis and runtime performance.</p><h2 id="tyvm" tabindex="-1"><a href="https://github.com/zackradisic/tyvm" target="_blank" rel="noreferrer">Tyvm</a> <a class="header-anchor" href="#tyvm" aria-label="Permalink to &quot;[Tyvm](https://github.com/zackradisic/tyvm)&quot;">​</a></h2><p>An experimental bytecode interpreter for type-level Typescript.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/ecosystem.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/performance.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Performance</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/references.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>References</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_performance" data-v-30a5e70a><div><h1 id="pursuit-of-performance-on-building-a-javascript-compiler" tabindex="-1">Pursuit of Performance on Building a JavaScript Compiler <a class="header-anchor" href="#pursuit-of-performance-on-building-a-javascript-compiler" aria-label="Permalink to &quot;Pursuit of Performance on Building a JavaScript Compiler&quot;">​</a></h1><p>Originally posted on <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">https://rustmagazine.org/issue-3/javascript-compiler/</a></p><h2 id="on-performance" tabindex="-1">On Performance <a class="header-anchor" href="#on-performance" aria-label="Permalink to &quot;On Performance&quot;">​</a></h2><p>After two years of writing Rust, performance has become an ingrained discipline for me - it boils down to <strong>allocate less memory</strong> and <strong>use fewer CPU cycles</strong>.</p><p>However, achieving optimal performance can be difficult without the knowledge of the problem domain or awareness of potential solutions.</p><p>I will take you on my journey of performance and optimization in the following sections. My preferred method of learning is through a combination of research, trial, and error, so the following sections will be organized as such.</p><h1 id="parsing" tabindex="-1">Parsing <a class="header-anchor" href="#parsing" aria-label="Permalink to &quot;Parsing&quot;">​</a></h1><p>Oxc is a standard compiler that includes an abstract syntax tree (AST), a lexer, and a recursive descent parser.</p><h2 id="abstract-syntax-tree-ast" tabindex="-1">Abstract Syntax Tree (AST) <a class="header-anchor" href="#abstract-syntax-tree-ast" aria-label="Permalink to &quot;Abstract Syntax Tree (AST)&quot;">​</a></h2><p>The first architectural design for a compiler is its AST.</p><p>All JavaScript tools work on the AST level, for example:</p><ul><li>A linter (e.g. ESLint) checks the AST for errors</li><li>A formatter (e.g.prettier) prints the AST back to JavaScript text</li><li>A minifier (e.g. terser) transforms the AST</li><li>A bundler connects all import and export statements between ASTs from different files</li></ul><p>It will be painful to build these tools if the AST is not user-friendly.</p><p>For JavaScript, the most used AST specification is <a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a>. My first AST version replicates estree:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Program</span><span style="color:#E1E4E8;"> {</span></span>
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role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_performance" data-v-30a5e70a><div><h1 id="pursuit-of-performance-on-building-a-javascript-compiler" tabindex="-1">Pursuit of Performance on Building a JavaScript Compiler <a class="header-anchor" href="#pursuit-of-performance-on-building-a-javascript-compiler" aria-label="Permalink to &quot;Pursuit of Performance on Building a JavaScript Compiler&quot;">​</a></h1><p>Originally posted on <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">https://rustmagazine.org/issue-3/javascript-compiler/</a></p><h2 id="on-performance" tabindex="-1">On Performance <a class="header-anchor" href="#on-performance" aria-label="Permalink to &quot;On Performance&quot;">​</a></h2><p>After two years of writing Rust, performance has become an ingrained discipline for me - it boils down to <strong>allocate less memory</strong> and <strong>use fewer CPU cycles</strong>.</p><p>However, achieving optimal performance can be difficult without the knowledge of the problem domain or awareness of potential solutions.</p><p>I will take you on my journey of performance and optimization in the following sections. My preferred method of learning is through a combination of research, trial, and error, so the following sections will be organized as such.</p><h1 id="parsing" tabindex="-1">Parsing <a class="header-anchor" href="#parsing" aria-label="Permalink to &quot;Parsing&quot;">​</a></h1><p>Oxc is a standard compiler that includes an abstract syntax tree (AST), a lexer, and a recursive descent parser.</p><h2 id="abstract-syntax-tree-ast" tabindex="-1">Abstract Syntax Tree (AST) <a class="header-anchor" href="#abstract-syntax-tree-ast" aria-label="Permalink to &quot;Abstract Syntax Tree (AST)&quot;">​</a></h2><p>The first architectural design for a compiler is its AST.</p><p>All JavaScript tools work on the AST level, for example:</p><ul><li>A linter (e.g. ESLint) checks the AST for errors</li><li>A formatter (e.g.prettier) prints the AST back to JavaScript text</li><li>A minifier (e.g. terser) transforms the AST</li><li>A bundler connects all import and export statements between ASTs from different files</li></ul><p>It will be painful to build these tools if the AST is not user-friendly.</p><p>For JavaScript, the most used AST specification is <a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a>. My first AST version replicates estree:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Program</span><span style="color:#E1E4E8;"> {</span></span>
 <span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
 <span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> body</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&gt;,</span></span>
 <span class="line"><span style="color:#E1E4E8;">}</span></span>
@@ -498,8 +498,8 @@
 <span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">mut</span><span style="color:#E1E4E8;"> handle </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> stdout</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">lock</span><span style="color:#E1E4E8;">();</span><span style="color:#6A737D;"> // acquire a lock on it</span></span>
 <span class="line"><span style="color:#B392F0;">writeln!</span><span style="color:#E1E4E8;">(handle, </span><span style="color:#9ECBFF;">&quot;foo: {}&quot;</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">42</span><span style="color:#E1E4E8;">);</span><span style="color:#6A737D;"> // add `?` if you care about errors here</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> stdout </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">io</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">stdout</span><span style="color:#24292E;">();</span><span style="color:#6A737D;"> // get the global stdout entity</span></span>
 <span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">mut</span><span style="color:#24292E;"> handle </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> stdout</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">lock</span><span style="color:#24292E;">();</span><span style="color:#6A737D;"> // acquire a lock on it</span></span>
-<span class="line"><span style="color:#6F42C1;">writeln!</span><span style="color:#24292E;">(handle, </span><span style="color:#032F62;">&quot;foo: {}&quot;</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">42</span><span style="color:#24292E;">);</span><span style="color:#6A737D;"> // add `?` if you care about errors here</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/performance.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:29:34.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/ecmascript/grammar.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Grammar</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/ecosystem.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Ecosystem</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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+<span class="line"><span style="color:#6F42C1;">writeln!</span><span style="color:#24292E;">(handle, </span><span style="color:#032F62;">&quot;foo: {}&quot;</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">42</span><span style="color:#24292E;">);</span><span style="color:#6A737D;"> // add `?` if you care about errors here</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/performance.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/docs/learn/ecmascript/grammar.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Grammar</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/docs/learn/ecosystem.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Ecosystem</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC Project</p></div></footer><!--[--><!--]--></div></div>
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class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_references" data-v-30a5e70a><div><h1 id="references" tabindex="-1">References <a class="header-anchor" href="#references" aria-label="Permalink to &quot;References&quot;">​</a></h1><h2 id="projects-using-oxc" tabindex="-1">Projects Using Oxc <a class="header-anchor" href="#projects-using-oxc" aria-label="Permalink to &quot;Projects Using Oxc&quot;">​</a></h2><h2 id="📚-learning-resources" tabindex="-1">📚 Learning Resources <a class="header-anchor" href="#📚-learning-resources" aria-label="Permalink to &quot;📚 Learning Resources&quot;">​</a></h2><ul><li>My small tutorial on <a href="https://oxc-project.github.io/javascript-parser-in-rust" target="_blank" rel="noreferrer">how to write a JavaScript Parser in Rust</a></li><li>My small article <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">Pursuit of Performance on Building a JavaScript Compiler</a></li><li><a href="https://craftinginterpreters.com" target="_blank" rel="noreferrer">Crafting Interpreters</a></li><li><a href="https://vimeo.com/649009599" target="_blank" rel="noreferrer">Andrew Kelley - Practical DOD</a></li></ul><h2 id="parsers-in-active-development" tabindex="-1">Parsers (in active development) <a class="header-anchor" href="#parsers-in-active-development" aria-label="Permalink to &quot;Parsers (in active development)&quot;">​</a></h2><ul><li>Rust <ul><li><a href="https://swc.rs" target="_blank" rel="noreferrer">swc</a></li><li><a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a></li><li><a href="https://github.com/ratel-rust/ratel-core" target="_blank" rel="noreferrer">ratel</a></li><li><a href="https://github.com/lastmjs/boa-azle" target="_blank" rel="noreferrer">boa</a></li></ul></li><li>JavaScript <ul><li><a href="https://github.com/acornjs/acorn" target="_blank" rel="noreferrer">acorn</a></li><li><a href="https://babeljs.io" target="_blank" rel="noreferrer">babel</a></li></ul></li><li>Go <ul><li><a href="https://esbuild.github.io" target="_blank" rel="noreferrer">esbuild</a></li></ul></li><li>C++ <ul><li><a href="https://github.com/quick-lint/quick-lint-js" target="_blank" rel="noreferrer">quick-lint-js</a></li></ul></li></ul><h2 id="ast" tabindex="-1">AST <a class="header-anchor" href="#ast" aria-label="Permalink to &quot;AST&quot;">​</a></h2><ul><li><a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a></li><li><a href="https://github.com/swc-project/swc/tree/main/crates/swc_ecma_ast/src" target="_blank" rel="noreferrer">swc_ecma_ast</a></li><li><a href="https://github.com/babel/babel/blob/main/packages/babel-types/src/ast-types/generated/index.ts" target="_blank" rel="noreferrer">babel ast</a></li><li><a href="https://gist.github.com/Boshen/0b481a058cd715576aaf1624d2c6d469" target="_blank" rel="noreferrer">jsparagus</a></li></ul><h2 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h2><ul><li><a href="https://nnethercote.github.io/perf-book/introduction.html" target="_blank" rel="noreferrer">The Rust Performance Book</a></li></ul><h2 id="blog-posts" tabindex="-1">Blog Posts <a class="header-anchor" href="#blog-posts" aria-label="Permalink to &quot;Blog Posts&quot;">​</a></h2><ul><li><a href="https://v8.dev/blog/scanner" target="_blank" rel="noreferrer">Blazingly fast parsing, part 1: optimizing the scanner</a></li><li><a href="https://v8.dev/blog/preparser" target="_blank" rel="noreferrer">Blazingly fast parsing, part 2: lazy parsing</a></li><li><a href="https://v8.dev/blog/tags/understanding-ecmascript" target="_blank" rel="noreferrer">Understanding ECMAScript</a></li><li><a href="https://matklad.github.io/2020/04/13/simple-but-powerful-pratt-parsing.html" target="_blank" rel="noreferrer">Simple but Powerful Pratt Parsing</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">JS syntactic quirks</a></li></ul></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/references.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path 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role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _docs_learn_references" data-v-30a5e70a><div><h1 id="references" tabindex="-1">References <a class="header-anchor" href="#references" aria-label="Permalink to &quot;References&quot;">​</a></h1><h2 id="projects-using-oxc" tabindex="-1">Projects Using Oxc <a class="header-anchor" href="#projects-using-oxc" aria-label="Permalink to &quot;Projects Using Oxc&quot;">​</a></h2><h2 id="📚-learning-resources" tabindex="-1">📚 Learning Resources <a class="header-anchor" href="#📚-learning-resources" aria-label="Permalink to &quot;📚 Learning Resources&quot;">​</a></h2><ul><li>My small tutorial on <a href="https://oxc-project.github.io/javascript-parser-in-rust" target="_blank" rel="noreferrer">how to write a JavaScript Parser in Rust</a></li><li>My small article <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">Pursuit of Performance on Building a JavaScript Compiler</a></li><li><a href="https://craftinginterpreters.com" target="_blank" rel="noreferrer">Crafting Interpreters</a></li><li><a href="https://vimeo.com/649009599" target="_blank" rel="noreferrer">Andrew Kelley - Practical DOD</a></li></ul><h2 id="parsers-in-active-development" tabindex="-1">Parsers (in active development) <a class="header-anchor" href="#parsers-in-active-development" aria-label="Permalink to &quot;Parsers (in active development)&quot;">​</a></h2><ul><li>Rust <ul><li><a href="https://swc.rs" target="_blank" rel="noreferrer">swc</a></li><li><a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a></li><li><a href="https://github.com/ratel-rust/ratel-core" target="_blank" rel="noreferrer">ratel</a></li><li><a href="https://github.com/lastmjs/boa-azle" target="_blank" rel="noreferrer">boa</a></li></ul></li><li>JavaScript <ul><li><a href="https://github.com/acornjs/acorn" target="_blank" rel="noreferrer">acorn</a></li><li><a href="https://babeljs.io" target="_blank" rel="noreferrer">babel</a></li></ul></li><li>Go <ul><li><a href="https://esbuild.github.io" target="_blank" rel="noreferrer">esbuild</a></li></ul></li><li>C++ <ul><li><a href="https://github.com/quick-lint/quick-lint-js" target="_blank" rel="noreferrer">quick-lint-js</a></li></ul></li></ul><h2 id="ast" tabindex="-1">AST <a class="header-anchor" href="#ast" aria-label="Permalink to &quot;AST&quot;">​</a></h2><ul><li><a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a></li><li><a href="https://github.com/swc-project/swc/tree/main/crates/swc_ecma_ast/src" target="_blank" rel="noreferrer">swc_ecma_ast</a></li><li><a href="https://github.com/babel/babel/blob/main/packages/babel-types/src/ast-types/generated/index.ts" target="_blank" rel="noreferrer">babel ast</a></li><li><a href="https://gist.github.com/Boshen/0b481a058cd715576aaf1624d2c6d469" target="_blank" rel="noreferrer">jsparagus</a></li></ul><h2 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h2><ul><li><a href="https://nnethercote.github.io/perf-book/introduction.html" target="_blank" rel="noreferrer">The Rust Performance Book</a></li></ul><h2 id="blog-posts" tabindex="-1">Blog Posts <a class="header-anchor" href="#blog-posts" aria-label="Permalink to &quot;Blog Posts&quot;">​</a></h2><ul><li><a href="https://v8.dev/blog/scanner" target="_blank" rel="noreferrer">Blazingly fast parsing, part 1: optimizing the scanner</a></li><li><a href="https://v8.dev/blog/preparser" target="_blank" rel="noreferrer">Blazingly fast parsing, part 2: lazy parsing</a></li><li><a href="https://v8.dev/blog/tags/understanding-ecmascript" target="_blank" rel="noreferrer">Understanding ECMAScript</a></li><li><a href="https://matklad.github.io/2020/04/13/simple-but-powerful-pratt-parsing.html" target="_blank" rel="noreferrer">Simple but Powerful Pratt Parsing</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">JS syntactic quirks</a></li></ul></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/docs/learn/references.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path 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diff --git a/index.html b/index.html
index 9cbeeebf6d..5087b5a176 100644
--- a/index.html
+++ b/index.html
@@ -1,18 +1,18 @@
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+<html lang="en" dir="ltr">
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     <meta name="description" content="A collection of high-performance JavaScript tools written in Rust">
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page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_blog_2022-08-08-linter-research" data-v-30a5e70a><div><header class="AppBlogPostHeader" data-v-f35b0a27><h1 data-v-f35b0a27>A research on JavaScript linters</h1><p data-v-f35b0a27><time datetime="2022-08-08T00:00:00.000Z" data-v-f35b0a27></time></p><ul class="authors" data-v-f35b0a27><!--[--><li class="author" data-v-f35b0a27><img src="https://www.github.com/Boshen.png" alt="Boshen" 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page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_blog_2023-11-08-announcing-oxlint" data-v-30a5e70a><div><header class="AppBlogPostHeader" data-v-f35b0a27><h1 data-v-f35b0a27>Oxlint General Availability</h1><p data-v-f35b0a27><time datetime="2023-11-08T00:00:00.000Z" data-v-f35b0a27></time></p><ul class="authors" data-v-f35b0a27><!--[--><li class="author" data-v-f35b0a27><img src="https://www.github.com/Boshen.png" alt="Boshen" 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page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_blog_" data-v-30a5e70a><div><p><a href="https://github.com/rome/tools" target="_blank" rel="noreferrer">Rome</a> uses a different set of techniques for parsing JavaScript and TypeScript. This tutorial summarizes them in learning order for better understanding.</p><h2 id="history" tabindex="-1">History <a class="header-anchor" href="#history" aria-label="Permalink to &quot;History&quot;">​</a></h2><ul><li>The Rome codebase was rewritten from TypeScript to Rust, see <a href="https://rome.tools/blog/2021/09/21/rome-will-be-rewritten-in-rust" target="_blank" rel="noreferrer">Rome will be rewritten in Rust</a></li><li>The decision was made after talking to the author of <a href="https://github.com/rslint/rslint" target="_blank" rel="noreferrer">rslint</a> and <a href="https://github.com/rust-lang/rust-analyzer" target="_blank" rel="noreferrer">rust-analyzer</a></li><li>rust-analyzer proved that IDE-centric tools built around concrete syntax tree are possible</li><li>rslint proved that it is possible to write a JavaScript parser in Rust, with the same base libraries as rust-analyzer</li><li>Rome ported the rslint codebase to their own repo with permission from rslint&#39;s author</li></ul><h2 id="concrete-syntax-tree" tabindex="-1">Concrete Syntax Tree <a class="header-anchor" href="#concrete-syntax-tree" aria-label="Permalink to &quot;Concrete Syntax Tree&quot;">​</a></h2><ul><li>The base library is called <a href="https://github.com/rust-analyzer/rowan" target="_blank" rel="noreferrer">rowan</a>, see <a href="https://github.com/rust-lang/rust-analyzer/blob/master/docs/dev/syntax.md" target="_blank" rel="noreferrer">overview of rowan</a></li><li>Rowan, also known as red-green trees, is named after the real green <a href="https://en.wikipedia.org/wiki/Rowan" target="_blank" rel="noreferrer">rowan tree</a> that makes red berries</li><li>The origin of red-green trees is described in this <a href="https://ericlippert.com/2012/06/08/red-green-trees/" target="_blank" rel="noreferrer">blog post</a>, by the authors of the C# programming language</li><li>The whole point of rowan is to define a lossless concrete syntax tree (CST) that describes all the details of the source code and provides a set of traversal APIs (parent, children, siblings, etc)</li><li>Read the advantage of having a CST over an AST: <a href="https://rdambrosio016.github.io/rust/2020/09/18/pure-ast-based-linting-sucks.html" target="_blank" rel="noreferrer">Pure AST based linting sucks</a></li><li>CST provides the ability to build a fully recoverable parser</li></ul><h2 id="grammar" tabindex="-1">Grammar <a class="header-anchor" href="#grammar" aria-label="Permalink to &quot;Grammar&quot;">​</a></h2><ul><li>Just like an AST, we need to define the grammar. The grammar is auto-generated by using <a href="https://github.com/rome/tools/tree/main/xtask/codegen" target="_blank" rel="noreferrer">xtask/codegen</a></li><li>The grammar is generated from the <a href="https://github.com/rust-analyzer/ungrammar" target="_blank" rel="noreferrer">ungrammar</a> DSL</li><li>The input <code>ungrammar</code> source file is in <a href="https://github.com/rome/tools/blob/main/xtask/codegen/js.ungram" target="_blank" rel="noreferrer">xtask/codegen/js.ungram</a></li><li>The output of the codegen is in <a href="https://github.com/rome/tools/tree/main/crates/rome_js_syntax/src/generated" target="_blank" rel="noreferrer">rome_js_syntax/src/generated</a></li></ul><h2 id="entry-point" tabindex="-1">Entry Point <a class="header-anchor" href="#entry-point" aria-label="Permalink to &quot;Entry Point&quot;">​</a></h2><p>The Rome codebase is getting large and slightly difficult to find the parser entry point.</p><p>For first-time contributors, the <code>rome_cli</code> crate is the binary entry point for running the code:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#B392F0;">touch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">test.js</span></span>
+<span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">rome_cli</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">check</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">./test.js</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">rome_cli</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6F42C1;">touch</span><span style="color:#24292E;"> </span><span style="color:#032F62;">test.js</span></span>
+<span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">rome_cli</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--</span><span style="color:#24292E;"> </span><span style="color:#032F62;">check</span><span style="color:#24292E;"> </span><span style="color:#032F62;">./test.js</span></span></code></pre></div><p><code>rome_cli</code> will eventually call <code>rome_js_parser::parse</code></p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/parse.rs#L178-L187</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/parse.rs#L178-L187</span></span></code></pre></div><p>and finally the actual parsing code</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/syntax/program.rs#L14-L17</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/9815467c66688773bc1bb6ef9a5b2d86ca7b3682/crates/rome_js_parser/src/syntax/program.rs#L14-L17</span></span></code></pre></div><h2 id="contributing" tabindex="-1">Contributing <a class="header-anchor" href="#contributing" aria-label="Permalink to &quot;Contributing&quot;">​</a></h2><ul><li><a href="https://github.com/rome/tools/blob/main/CONTRIBUTING.md" target="_blank" rel="noreferrer">CONTRIBUTING.md</a> has instructions on how to contribute</li><li><a href="https://rome.github.io/tools/rome_js_parser/index.html" target="_blank" rel="noreferrer">rome_js_parser crate doc</a> has some more details on the parser</li><li>See <a href="https://github.com/rome/tools/tree/main/xtask/codegen#cargo-codegen-test" target="_blank" rel="noreferrer"><code>cargo codegen test</code></a> for working with parser tests</li><li>See <a href="https://github.com/rome/tools/tree/main/xtask/coverage" target="_blank" rel="noreferrer"><code>cargo coverage</code></a> for working with conformance tests</li><li>Join the <a href="https://discord.com/invite/rome" target="_blank" rel="noreferrer">Discord Server</a> for inquiries</li></ul><div class="info custom-block"><p class="custom-block-title">INFO</p><p>The JavaScript / TypeScript parser is 99% complete, the best way to help is to test Rome in your own codebases or take a look at the <a href="https://github.com/rome/tools/issues" target="_blank" rel="noreferrer">issues on Github</a>.</p></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/blog/index.md" target="_blank" rel="noreferrer" 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data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_contribute_development" data-v-30a5e70a><div><h1 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h1><p>This page explains how to set up enrionment for OXC development.</p><h2 id="clone-repository" tabindex="-1">Clone Repository <a class="header-anchor" href="#clone-repository" aria-label="Permalink to &quot;Clone Repository&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">git</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">clone</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--recurse-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--shallow-submodules</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">git@github.com:oxc-project/oxc.git</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">git</span><span style="color:#24292E;"> </span><span style="color:#032F62;">clone</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--recurse-submodules</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--shallow-submodules</span><span style="color:#24292E;"> </span><span style="color:#032F62;">git@github.com:oxc-project/oxc.git</span></span></code></pre></div><p>The <code>--recurse-submodules</code> and <code>--shallow-submodules</code> flags are needed to initialize git submodules that are needed to run conformance tests.</p><h2 id="set-up-project" tabindex="-1">Set Up Project <a class="header-anchor" href="#set-up-project" aria-label="Permalink to &quot;Set Up Project&quot;">​</a></h2><h3 id="install-rust" tabindex="-1">Install Rust <a class="header-anchor" href="#install-rust" aria-label="Permalink to &quot;Install Rust&quot;">​</a></h3><p>If you have not yet installed Rust, follow <a href="https://www.rust-lang.org/tools/install" target="_blank" rel="noreferrer">the official instruction</a> and install Rust.</p><p>After installing Rust, run the following command at the project root:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">rustup</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">show</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">rustup</span><span style="color:#24292E;"> </span><span style="color:#032F62;">show</span></span></code></pre></div><p><code>rustup show</code> reads the <code>./rust-toolchain.toml</code> file and installs the correct Rust toolchain and components for this project.</p><h3 id="install-project-tools" tabindex="-1">Install Project Tools <a class="header-anchor" href="#install-project-tools" aria-label="Permalink to &quot;Install Project Tools&quot;">​</a></h3><h4 id="cargo-binstall" tabindex="-1"><code>cargo-binstall</code> <a class="header-anchor" href="#cargo-binstall" aria-label="Permalink to &quot;`cargo-binstall`&quot;">​</a></h4><p>Some Cargo tools are required to develop OXC, and it is recommended to use <a href="https://github.com/cargo-bins/cargo-binstall" target="_blank" rel="noreferrer">cargo binstall</a>, which provides a low-complexity mechanism to install rust binaries and is fater way than building them from source by running <code>cargo install</code>.</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo-binstall</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo-binstall</span></span></code></pre></div><p>You can also download <a href="https://github.com/cargo-bins/cargo-binstall#installation" target="_blank" rel="noreferrer">the pre-compiled binary</a> and save it in <code>~/.cargo/bin</code>.</p><h4 id="just" tabindex="-1"><code>just</code> <a class="header-anchor" href="#just" aria-label="Permalink to &quot;`just`&quot;">​</a></h4><p>OXC utilizes <a href="https://github.com/casey/just" target="_blank" rel="noreferrer"><code>just</code></a>, which is a handy way to save and run project-specific commands:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">binstall</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-y</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">binstall</span><span style="color:#24292E;"> </span><span style="color:#032F62;">just</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-y</span></span></code></pre></div><h4 id="dependencies" tabindex="-1">Dependencies <a class="header-anchor" href="#dependencies" aria-label="Permalink to &quot;Dependencies&quot;">​</a></h4><p>Run the following command in <code>justfile</code> at the project root to install dependencies:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">init</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">init</span></span></code></pre></div><p>You can see the list of available commands by running <code>just</code>.</p><p>You can run <code>just ready</code> (or, <code>just r</code> in short) to make sure the whole project builds and runs correctly.</p><hr><p>Now you are ready to develop OXC! 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data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_contribute_introduction" data-v-30a5e70a><div><h1 id="introduction" tabindex="-1">Introduction <a class="header-anchor" href="#introduction" aria-label="Permalink to &quot;Introduction&quot;">​</a></h1><p>Thank you for getting interested in contributing to OXC project! Before starting, please make sure to read the following rules and policy.</p><h2 id="general-rules" tabindex="-1">General Rules <a class="header-anchor" href="#general-rules" aria-label="Permalink to &quot;General Rules&quot;">​</a></h2><ul><li>We welcome and appreciate any form of contributions.</li><li>Please create an issue or discussion if you want to make an architectural change.</li></ul><h2 id="pr-rules" tabindex="-1">PR Rules <a class="header-anchor" href="#pr-rules" aria-label="Permalink to &quot;PR Rules&quot;">​</a></h2><ul><li>We <a href="https://graphite.dev/blog/how-large-prs-slow-down-development" target="_blank" rel="noreferrer">prefer smaller PRs</a> for faster development.</li><li>Try stacked PRs with <a href="https://graphite.dev" target="_blank" rel="noreferrer">graphite</a> if you are given access permission to the repository.</li></ul><h2 id="action-policy" tabindex="-1">Action Policy <a class="header-anchor" href="#action-policy" aria-label="Permalink to &quot;Action Policy&quot;">​</a></h2><p>Taken from <a href="https://astral-sh.notion.site/Astral-s-Values-0ed6a642bcc84e91af6836b2373572f5" target="_blank" rel="noreferrer">Astral&#39;s values</a>:</p><blockquote><p>We bias towards action, even in the face of uncertainty. We favor <em>pragmatic doing</em> over <strong>prolonged debating</strong>; we favor asking for <em>forgiveness</em> over <em>permission</em>. We value <strong>decisiveness — especially</strong> when a decision isn’t clear cut, and <strong>especially</strong> when a decision is reversible.</p><p>A bias towards action is <em>not</em> the same as recklessness. Rather, it’s a bias towards making <em>responsible</em> decisions and acting on them with <em>urgency</em>, even if we’re left with lingering ambiguity or known unknowns.</p></blockquote><h2 id="development-policy" tabindex="-1">Development Policy <a class="header-anchor" href="#development-policy" aria-label="Permalink to &quot;Development Policy&quot;">​</a></h2><ul><li>All performance issues (runtime and compilation speed) are considered as bugs in this project.</li><li>Embrace data-oriented design.</li><li>APIs should be simple and well-documented.</li><li>Third-party dependencies should be minimal.</li><li>Avoid the <code>regex</code> crate when possible. Regexes are slow, most of them can be rewritten in a performant way by using Rust iterator and string methods.</li><li>Avoid macros, traits or any Rust techniques that would penalize compilation speed.</li></ul><h2 id="maintenance-policy" tabindex="-1">Maintenance Policy <a class="header-anchor" href="#maintenance-policy" aria-label="Permalink to &quot;Maintenance Policy&quot;">​</a></h2><ul><li>Monitor code coverage for unused code. Aim for 99% code coverage.</li><li>CI time should be actively monitored and reduced to speed up merging of PRs. 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class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_contribute_linter" data-v-30a5e70a><div><h1 id="linter" tabindex="-1">Linter <a class="header-anchor" href="#linter" aria-label="Permalink to &quot;Linter&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Create a <code>./test.ts</code> and then</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">watch</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">watch</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;run -p oxc_cli --bin oxlint -- test.ts&quot;</span></span></code></pre></div><h2 id="rule-generation" tabindex="-1">Rule generation <a class="header-anchor" href="#rule-generation" aria-label="Permalink to &quot;Rule generation&quot;">​</a></h2><p>Create a new lint rule by providing the ESLint name</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span></code></pre></div><p>Then add the rule to <code>crates/oxc_linter/src/rules.rs</code>:</p><ol><li>Add to <code>mod</code></li><li>Add to <code>oxc_macros::declare_all_lint_rules</code> at the bottom of the file</li></ol><p>For other plugins, there are also:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-jest-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
+<span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-ts-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
+<span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-unicorn-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
+<span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-react-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span>
+<span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">new-jsx-a11y-rule</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">name</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-jest-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
+<span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-ts-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
+<span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-unicorn-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
+<span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-react-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span>
+<span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">new-jsx-a11y-rule</span><span style="color:#24292E;"> </span><span style="color:#032F62;">name</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/contribute/linter.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/contribute/parser.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Parser</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/ja/docs/contribute/prettier.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Prettier</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_contribute_minifier" data-v-30a5e70a><div><h1 id="minifier" tabindex="-1">Minifier <a class="header-anchor" href="#minifier" aria-label="Permalink to &quot;Minifier&quot;">​</a></h1><p>JavaScript minification plays a crucial role in optimizing website performance as it reduces the amount of data sent to users, resulting in faster page loads. This holds tremendous economic value, particularly for e-commerce websites, where every second can equate to millions of dollars.</p><p>However, existing minifiers typically require a trade-off between compression quality and speed. You have to choose between the slowest for the best compression or the fastest for less compression. But what if we could develop a faster minifier without compromising on compression?</p><p>We are actively working on a prototype that aims to achieve this goal, by porting all test cases from well-known minifiers such as [google-closure-compiler], [terser], [esbuild], and [tdewolff-minify].</p><p>Preliminary results indicate that we are on track to achieve our objectives. 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data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_contribute_parser" data-v-30a5e70a><div><h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>We aim to be the fastest Rust-based ready-for-production parser.</p><h2 id="conformance-tests" tabindex="-1">Conformance Tests <a class="header-anchor" href="#conformance-tests" aria-label="Permalink to &quot;Conformance Tests&quot;">​</a></h2><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">just</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">c</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">just</span><span style="color:#24292E;"> </span><span style="color:#032F62;">c</span></span></code></pre></div><p>Aliased to <code>just coverage</code>, runs the following conformance test suites by using the conformance runner found in <a href="https://github.com/oxc-project/oxc/tree/main/tasks/coverage" target="_blank" rel="noreferrer">tasks/coverage</a>.</p><h3 id="test262" tabindex="-1">Test262 <a class="header-anchor" href="#test262" aria-label="Permalink to &quot;Test262&quot;">​</a></h3><p>JavaScript has the <a href="https://github.com/tc39/test262" target="_blank" rel="noreferrer">ECMAScript Test Suite</a> called Test262. The goal of Test262 is to provide test material that covers every observable behavior specified in the specification. Parser conformance uses the <a href="https://github.com/tc39/test262/blob/main/INTERPRETING.md#negative" target="_blank" rel="noreferrer">parse phase tests</a>.</p><h3 id="babel" tabindex="-1">Babel <a class="header-anchor" href="#babel" aria-label="Permalink to &quot;Babel&quot;">​</a></h3><p>When new language features are added to JavaScript, it is required to have them implemented by Babel, this means Babel has another set of <a href="https://github.com/babel/babel/tree/main/packages/babel-parser/test" target="_blank" rel="noreferrer">parser tests</a>.</p><h3 id="typescript" tabindex="-1">TypeScript <a class="header-anchor" href="#typescript" aria-label="Permalink to &quot;TypeScript&quot;">​</a></h3><p>The TypeScript conformance tests can be found <a href="https://github.com/microsoft/TypeScript/tree/main/tests/cases/conformance" target="_blank" rel="noreferrer">here</a>.</p><h2 id="test-runner" tabindex="-1">Test Runner <a class="header-anchor" href="#test-runner" aria-label="Permalink to &quot;Test Runner&quot;">​</a></h2><p>Rome has implemented a test runner for the above test suites, they can be found .</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/contribute/parser.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/contribute/development.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Development</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/ja/docs/contribute/linter.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Linter</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_contribute_performance" data-v-30a5e70a><div><h1 id="performance-tuning" tabindex="-1">Performance Tuning <a class="header-anchor" href="#performance-tuning" aria-label="Permalink to &quot;Performance Tuning&quot;">​</a></h1><h2 id="compile-time" tabindex="-1">Compile Time <a class="header-anchor" href="#compile-time" aria-label="Permalink to &quot;Compile Time&quot;">​</a></h2><p>While Rust has gained a reputation for its comparatively slower compilation speed, we have dedicated significant effort to fine-tune the Rust compilation speed. Our aim is to minimize any impact on your development workflow, ensuring that developing your own Oxc based tools remains a smooth and efficient experience.</p><p>This is demonstrated by our <a href="https://github.com/oxc-project/oxc/actions/workflows/ci.yml?query=branch%3Amain" target="_blank" rel="noreferrer">CI runs</a>, where warm runs complete in 5 minutes.</p><h2 id="profile" tabindex="-1">Profile <a class="header-anchor" href="#profile" aria-label="Permalink to &quot;Profile&quot;">​</a></h2><h3 id="mac-xcode-instruments" tabindex="-1">Mac Xcode Instruments <a class="header-anchor" href="#mac-xcode-instruments" aria-label="Permalink to &quot;Mac Xcode Instruments&quot;">​</a></h3><p>Mac Xcode instruments can be used to produce a CPU profile.</p><p>To install Xcode Instruments, install the Command Line Tools:</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">xcode-select</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--install</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">xcode-select</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--install</span></span></code></pre></div><p>For normal Rust builds, <a href="https://github.com/cmyr/cargo-instruments" target="_blank" rel="noreferrer"><code>cargo instruments</code></a> can be used as the glue for profiling and creating the trace file.</p><p>First, change the profile for showing debug symbols.</p><div class="language-toml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">toml</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">[</span><span style="color:#B392F0;">profile</span><span style="color:#E1E4E8;">.</span><span style="color:#B392F0;">release</span><span style="color:#E1E4E8;">]</span></span>
+<span class="line"><span style="color:#E1E4E8;">debug = </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;"># debug info with line tables only</span></span>
+<span class="line"><span style="color:#E1E4E8;">strip = </span><span style="color:#79B8FF;">false</span><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;"># do not strip symbols</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">[</span><span style="color:#6F42C1;">profile</span><span style="color:#24292E;">.</span><span style="color:#6F42C1;">release</span><span style="color:#24292E;">]</span></span>
+<span class="line"><span style="color:#24292E;">debug = </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> </span><span style="color:#6A737D;"># debug info with line tables only</span></span>
+<span class="line"><span style="color:#24292E;">strip = </span><span style="color:#005CC5;">false</span><span style="color:#24292E;"> </span><span style="color:#6A737D;"># do not strip symbols</span></span></code></pre></div><p>Then build the project</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">build</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--release</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-p</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_cli</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--bin</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">build</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--release</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-p</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_cli</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--bin</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><p>The binary is located at <code>./target/release/oxlint</code> once the project is built.</p><p>Under the hood, <code>cargo instruments</code> invokes the <code>xcrun</code> command, equivalent to</p><div class="language-bash vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">xcrun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">xctrace</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">record</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--template</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&#39;Time Profile&#39;</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--output</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">.</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--launch</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">/path/to/oxc/target/release/oxlint</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">--quiet</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">xcrun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">xctrace</span><span style="color:#24292E;"> </span><span style="color:#032F62;">record</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--template</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&#39;Time Profile&#39;</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--output</span><span style="color:#24292E;"> </span><span style="color:#032F62;">.</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--launch</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--</span><span style="color:#24292E;"> </span><span style="color:#032F62;">/path/to/oxc/target/release/oxlint</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">--quiet</span></span></code></pre></div><p>Running the command above produces the following output</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">Starting recording with the Time Profiler template. Launching process: oxlint.</span></span>
+<span class="line"><span style="color:#e1e4e8;">Ctrl-C to stop the recording</span></span>
+<span class="line"><span style="color:#e1e4e8;">Target app exited, ending recording...</span></span>
+<span class="line"><span style="color:#e1e4e8;">Recording completed. Saving output file...</span></span>
+<span class="line"><span style="color:#e1e4e8;">Output file saved as: Launch_oxlint_2023-09-03_4.41.45 PM_EB179B85.trace</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">Starting recording with the Time Profiler template. Launching process: oxlint.</span></span>
+<span class="line"><span style="color:#24292e;">Ctrl-C to stop the recording</span></span>
+<span class="line"><span style="color:#24292e;">Target app exited, ending recording...</span></span>
+<span class="line"><span style="color:#24292e;">Recording completed. Saving output file...</span></span>
+<span class="line"><span style="color:#24292e;">Output file saved as: Launch_oxlint_2023-09-03_4.41.45 PM_EB179B85.trace</span></span></code></pre></div><p>Open the trace file <code>open Launch_oxlint_2023-09-03_4.41.45\ PM_EB179B85.trace</code>.</p><p>To see a top down trace:</p><ol><li>On the top panel, click CPUs</li><li>On the left input box, click <code>x</code> then select <code>Time Profiler</code></li><li>At the bottom panel, click &quot;Call Tree&quot;, turn on &quot;Invert Call Tree&quot; and turn off separate by thread.</li></ol></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/contribute/performance.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/contribute/vscode.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>VSCode</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/ja/docs/contribute/showcase.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Showcase</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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However, it can often become a performance bottleneck. 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data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/resolver.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Resolver</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/transformer.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Transformer</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/formatter.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Formatter</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/codegen.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Codegen</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/minifier.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Minifier</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/vscode.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>VSCode</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-38384e3a><section class="VPSidebarItem level-0 has-active" data-v-38384e3a data-v-1a4376dd><!----><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/performance.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Performance</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/showcase.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Showcase</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div 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data-v-1a4376dd><!----><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/performance.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Performance</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/showcase.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Showcase</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_contribute_transformer" data-v-30a5e70a><div><h1 id="transformer" tabindex="-1">Transformer <a class="header-anchor" href="#transformer" aria-label="Permalink to &quot;Transformer&quot;">​</a></h1><p>A transformer is responsible for turning higher versions of ECMAScript to a lower version that can be used in older browsers. We are currently focusing on an esnext to es2015 transpiler. 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data-v-1a4376dd><!----><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/performance.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Performance</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/contribute/showcase.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Showcase</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_contribute_vscode" data-v-30a5e70a><div><h1 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h1><h2 id="development" tabindex="-1">Development <a class="header-anchor" href="#development" aria-label="Permalink to &quot;Development&quot;">​</a></h2><p>Build the extension and run it inside vscode:</p><ol><li><code>pnpm install</code></li><li><code>pnpm run build</code></li><li><code>pnpm run package</code></li><li>open vscode and run the command palette &quot;Extensions: Install from VSIX...&quot;</li><li>find the <code>oxc-vscode-x.x.x.vsix</code> file from <code>./editor/vscode</code> directory</li><li>open a <code>.js</code> / <code>.ts</code> file, add <code>debugger;</code> and save</li><li>see the warning 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data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_guide_introduction" data-v-30a5e70a><div><h1 id="what-is-oxc" tabindex="-1">What is OXC? <a class="header-anchor" href="#what-is-oxc" aria-label="Permalink to &quot;What is OXC?&quot;">​</a></h1><p>The Oxidation Compiler is a collection of high-performance tools for the JavaScript and TypeScript language.</p><p>We are building a parser, linter, formatter, transpiler, minifier, resolver ... all written in Rust.</p><p>Our goal is to create and empower the fastest and most user friendly tools for <a href="https://www.swyx.io/js-third-age" target="_blank" rel="noreferrer">The Third Age of JavaScript</a>.</p><h2 id="philosophy" tabindex="-1">Philosophy <a class="header-anchor" href="#philosophy" aria-label="Permalink to &quot;Philosophy&quot;">​</a></h2><p>This project shares the same philosophies as <a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a> and <a href="https://beta.ruff.rs" target="_blank" rel="noreferrer">Ruff</a>.</p><ol><li>JavaScript tooling could be rewritten in a more performant language.</li><li>An integrated toolchain can tap into efficiencies that are not available to a disparate set of tools.</li></ol><h2 id="core-team" tabindex="-1">Core Team <a class="header-anchor" href="#core-team" aria-label="Permalink to &quot;Core Team&quot;">​</a></h2><div class="VPTeamMembers medium count-3" data-v-08f54381><div class="container" data-v-08f54381><!--[--><div class="item" data-v-08f54381><article class="VPTeamMembersItem medium" data-v-08f54381 data-v-7cfb1dae><div class="profile" data-v-7cfb1dae><figure class="avatar" data-v-7cfb1dae><img class="avatar-img" src="https://www.github.com/Boshen.png" alt="Boshen" data-v-7cfb1dae></figure><div 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class="VPLink link link" href="/ja/docs/guide/introduction.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>イントロダクション</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/guide/benchmarks.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>ベンチマーク</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-38384e3a><section class="VPSidebarItem level-0 has-active" data-v-38384e3a data-v-1a4376dd><div class="item" role="button" tabindex="0" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><h2 class="text" data-v-1a4376dd>使いかた</h2><!----></div><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/guide/usage/linter.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Linter</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/guide/usage/parser.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Parser</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/guide/usage/resolver.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Resolver</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_guide_usage_linter" data-v-30a5e70a><div><ul class="AppBadgeList" data-v-095e1027><!--[--><li class="badge" data-v-095e1027><img src="https://img.shields.io/npm/dw/oxlint" alt="npm" data-v-095e1027></li><li class="badge" data-v-095e1027><img src="https://img.shields.io/github/stars/oxc-project/oxc" alt="GitHub Repo stars" data-v-095e1027></li><!--]--></ul><h1 id="oxlint" tabindex="-1">oxlint <a class="header-anchor" href="#oxlint" aria-label="Permalink to &quot;oxlint&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>Runs 50-100x faster than ESLint, and scales with the number of CPU cores (<a href="https://github.com/oxc-project/bench-javascript-linter" target="_blank" rel="noreferrer">Benchmark</a>)</li><li>No configuration required</li><li>Convention over configuration</li><li>Reports errors and useless code by default</li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/ignore#the-eslintignore-file" target="_blank" rel="noreferrer">.eslintignore</a></li><li>Supports <a href="https://eslint.org/docs/latest/use/configure/rules#disabling-rules" target="_blank" rel="noreferrer">ESLint comment disabling</a></li></ul><h2 id="adoptions" tabindex="-1">Adoptions <a class="header-anchor" href="#adoptions" aria-label="Permalink to &quot;Adoptions&quot;">​</a></h2><ul><li>A 5M LOC typescript codebase previously running ESLint parallelized across 48 workers in CI taking 75 mins (12m wall time), it is now 8 seconds on a single worker. (<a href="https://twitter.com/boshen_c/status/1714827365136929029" target="_blank" rel="noreferrer">Source</a>)</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><p>Install <a href="https://www.npmjs.com/package/oxlint" target="_blank" rel="noreferrer">oxlint</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Uhj3_" id="tab-Ayrlbyz" checked="checked"><label for="tab-Ayrlbyz">npm</label><input type="radio" name="group-Uhj3_" id="tab-VnU2bwd"><label for="tab-VnU2bwd">pnpm</label><input type="radio" name="group-Uhj3_" id="tab-LvxNi-p"><label for="tab-LvxNi-p">yarn</label><input type="radio" name="group-Uhj3_" id="tab-N6eOLuP"><label for="tab-N6eOLuP">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint</span></span></code></pre></div></div></div><p>You can also run oxlint directly:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-BiTwj" id="tab-z8hh0tF" checked="checked"><label for="tab-z8hh0tF">npm</label><input type="radio" name="group-BiTwj" id="tab-yuGRyG4"><label for="tab-yuGRyG4">pnpm</label><input type="radio" name="group-BiTwj" id="tab-dW8zdDA"><label for="tab-dW8zdDA">yarn</label><input type="radio" name="group-BiTwj" id="tab-Kk1FN0V"><label for="tab-Kk1FN0V">bun</label><input type="radio" name="group-BiTwj" id="tab-CmzXplb"><label for="tab-CmzXplb">deno</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">dlx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">dlx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bunx</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bunx</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">deno</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">run</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">deno</span><span style="color:#24292E;"> </span><span style="color:#032F62;">run</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxlint@latest</span></span></code></pre></div></div></div><p>You can download the binary files from <a href="https://github.com/oxc-project/oxc/releases/latest" target="_blank" rel="noreferrer">the latest GitHub releases</a>.</p><h2 id="integration" tabindex="-1">Integration <a class="header-anchor" href="#integration" aria-label="Permalink to &quot;Integration&quot;">​</a></h2><h3 id="ides" tabindex="-1">IDEs <a class="header-anchor" href="#ides" aria-label="Permalink to &quot;IDEs&quot;">​</a></h3><h4 id="vscode-extension" tabindex="-1">VSCode Extension <a class="header-anchor" href="#vscode-extension" aria-label="Permalink to &quot;VSCode Extension&quot;">​</a></h4><p>You can download <a href="https://marketplace.visualstudio.com/items?itemName=oxc.oxc-vscode" target="_blank" rel="noreferrer">the official VSCode extension</a>.</p><h4 id="vim-nvim-coc" tabindex="-1">Vim / Nvim (coc) <a class="header-anchor" href="#vim-nvim-coc" aria-label="Permalink to &quot;Vim / Nvim (coc)&quot;">​</a></h4><p>Add the following config to <code>coc-settings.json</code>:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">{</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#9ECBFF;">&quot;languageserver&quot;</span><span style="color:#E1E4E8;">: {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#9ECBFF;">&quot;oxc&quot;</span><span style="color:#E1E4E8;">: {</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#9ECBFF;">&quot;command&quot;</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">&quot;oxc_vscode&quot;</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#9ECBFF;">&quot;filetypes&quot;</span><span style="color:#E1E4E8;">: [</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;typescript&quot;</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;javascript&quot;</span></span>
+<span class="line"><span style="color:#E1E4E8;">      ],</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#9ECBFF;">&quot;rootPatterns&quot;</span><span style="color:#E1E4E8;">: [</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;.git&quot;</span></span>
+<span class="line"><span style="color:#E1E4E8;">      ]</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">  }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">{</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#032F62;">&quot;languageserver&quot;</span><span style="color:#24292E;">: {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#032F62;">&quot;oxc&quot;</span><span style="color:#24292E;">: {</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#032F62;">&quot;command&quot;</span><span style="color:#24292E;">: </span><span style="color:#032F62;">&quot;oxc_vscode&quot;</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#032F62;">&quot;filetypes&quot;</span><span style="color:#24292E;">: [</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;typescript&quot;</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;javascript&quot;</span></span>
+<span class="line"><span style="color:#24292E;">      ],</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#032F62;">&quot;rootPatterns&quot;</span><span style="color:#24292E;">: [</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;.git&quot;</span></span>
+<span class="line"><span style="color:#24292E;">      ]</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">  }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><h3 id="continuous-integration" tabindex="-1">Continuous Integration <a class="header-anchor" href="#continuous-integration" aria-label="Permalink to &quot;Continuous Integration&quot;">​</a></h3><p>It is recommended to run <code>oxlint</code> before <code>eslint</code> for faster feedback loops, since <code>oxlint</code> only takes a few seconds to run.</p><h4 id="github-actions" tabindex="-1">GitHub Actions <a class="header-anchor" href="#github-actions" aria-label="Permalink to &quot;GitHub Actions&quot;">​</a></h4><div class="language-yaml vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">yaml</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#85E89D;">jobs</span><span style="color:#E1E4E8;">:</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#85E89D;">oxlint</span><span style="color:#E1E4E8;">:</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#85E89D;">name</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">Lint JS</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#85E89D;">runs-on</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">ubuntu-latest</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#85E89D;">steps</span><span style="color:#E1E4E8;">:</span></span>
+<span class="line"><span style="color:#E1E4E8;">      - </span><span style="color:#85E89D;">uses</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">actions/checkout@v3</span></span>
+<span class="line"><span style="color:#E1E4E8;">      - </span><span style="color:#85E89D;">run</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">npx --yes oxlint@latest</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#22863A;">jobs</span><span style="color:#24292E;">:</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#22863A;">oxlint</span><span style="color:#24292E;">:</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#22863A;">name</span><span style="color:#24292E;">: </span><span style="color:#032F62;">Lint JS</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#22863A;">runs-on</span><span style="color:#24292E;">: </span><span style="color:#032F62;">ubuntu-latest</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#22863A;">steps</span><span style="color:#24292E;">:</span></span>
+<span class="line"><span style="color:#24292E;">      - </span><span style="color:#22863A;">uses</span><span style="color:#24292E;">: </span><span style="color:#032F62;">actions/checkout@v3</span></span>
+<span class="line"><span style="color:#24292E;">      - </span><span style="color:#22863A;">run</span><span style="color:#24292E;">: </span><span style="color:#032F62;">npx --yes oxlint@latest</span></span></code></pre></div><h3 id="nix" tabindex="-1">Nix <a class="header-anchor" href="#nix" aria-label="Permalink to &quot;Nix&quot;">​</a></h3><p>Check <a href="https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/tools/oxlint/default.nix" target="_blank" rel="noreferrer">nixpkgs repository</a> for more detail.</p><h2 id="commands" tabindex="-1">Commands <a class="header-anchor" href="#commands" aria-label="Permalink to &quot;Commands&quot;">​</a></h2><ul><li><p><code>npx oxlint@latest --rules</code> shows the list of rules</p></li><li><p><code>npx oxlint@latest --help</code> shows usage instructions</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">Usage: oxlint [-A=NAME | -D=NAME]... [--fix] [PATH]...</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Allowing / Denying Multiple Lints</span></span>
+<span class="line"><span style="color:#e1e4e8;">  For example `-D correctness -A no-debugger` or `-A all -D no-debugger`.</span></span>
+<span class="line"><span style="color:#e1e4e8;">  The default category is &quot;-D correctness&quot;.</span></span>
+<span class="line"><span style="color:#e1e4e8;">  Use &quot;--rules&quot; for rule names.</span></span>
+<span class="line"><span style="color:#e1e4e8;">  Use &quot;--help --help&quot; for rule categories.</span></span>
+<span class="line"><span style="color:#e1e4e8;">    -A, --allow=NAME          Allow the rule or category (suppress the lint)</span></span>
+<span class="line"><span style="color:#e1e4e8;">    -D, --deny=NAME           Deny the rule or category (emit an error)</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Enable Plugins</span></span>
+<span class="line"><span style="color:#e1e4e8;">        --import-plugin       Enable the experimental import plugin and detect ESM problems</span></span>
+<span class="line"><span style="color:#e1e4e8;">        --jest-plugin         Enable the Jest plugin and detect test problems</span></span>
+<span class="line"><span style="color:#e1e4e8;">        --jsx-a11y-plugin     Enable the JSX-a11y plugin and detect accessibility problems</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Available positional items:</span></span>
+<span class="line"><span style="color:#e1e4e8;">    PATH                      Single file, single path or list of paths</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Available options:</span></span>
+<span class="line"><span style="color:#e1e4e8;">    -h, --help                Prints help information</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">Usage: oxlint [-A=NAME | -D=NAME]... [--fix] [PATH]...</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Allowing / Denying Multiple Lints</span></span>
+<span class="line"><span style="color:#24292e;">  For example `-D correctness -A no-debugger` or `-A all -D no-debugger`.</span></span>
+<span class="line"><span style="color:#24292e;">  The default category is &quot;-D correctness&quot;.</span></span>
+<span class="line"><span style="color:#24292e;">  Use &quot;--rules&quot; for rule names.</span></span>
+<span class="line"><span style="color:#24292e;">  Use &quot;--help --help&quot; for rule categories.</span></span>
+<span class="line"><span style="color:#24292e;">    -A, --allow=NAME          Allow the rule or category (suppress the lint)</span></span>
+<span class="line"><span style="color:#24292e;">    -D, --deny=NAME           Deny the rule or category (emit an error)</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Enable Plugins</span></span>
+<span class="line"><span style="color:#24292e;">        --import-plugin       Enable the experimental import plugin and detect ESM problems</span></span>
+<span class="line"><span style="color:#24292e;">        --jest-plugin         Enable the Jest plugin and detect test problems</span></span>
+<span class="line"><span style="color:#24292e;">        --jsx-a11y-plugin     Enable the JSX-a11y plugin and detect accessibility problems</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Available positional items:</span></span>
+<span class="line"><span style="color:#24292e;">    PATH                      Single file, single path or list of paths</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Available options:</span></span>
+<span class="line"><span style="color:#24292e;">    -h, --help                Prints help information</span></span></code></pre></div></li></ul><h2 id="system-requirements" tabindex="-1">System Requirements <a class="header-anchor" href="#system-requirements" aria-label="Permalink to &quot;System Requirements&quot;">​</a></h2><p><code>oxlint</code> is built for the following systems:</p><ul><li>darwin-arm64</li><li>darwin-x64</li><li>linux-arm64</li><li>linux-x64</li><li>win32-arm64</li><li>win32-x64</li></ul></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/guide/usage/linter.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/guide/benchmarks.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>ベンチマーク</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/ja/docs/guide/usage/parser.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Parser</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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+<!DOCTYPE html>
+<html lang="ja" dir="ltr">
+  <head>
+    <meta charset="utf-8">
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+    <title>Parser | The JavaScript Oxidation Compiler</title>
+    <meta name="description" content="A collection of high-performance JavaScript tools written in Rust">
+    <link rel="preload stylesheet" href="/assets/style.dd858c05.css" as="style">
+    
+    <script type="module" src="/assets/app.a465d4fe.js"></script>
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data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_guide_usage_parser" data-v-30a5e70a><div><ul class="AppBadgeList" data-v-095e1027><!--[--><li class="badge" data-v-095e1027><img src="https://img.shields.io/npm/dw/oxc-parser" alt="npm" data-v-095e1027></li><!--]--></ul><h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><h2 id="features" tabindex="-1">Features <a class="header-anchor" href="#features" aria-label="Permalink to &quot;Features&quot;">​</a></h2><ul><li>2x faster then <a href="https://swc.rs" target="_blank" rel="noreferrer">SWC</a> parser</li><li>By far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust</li></ul><p>You can check <a href="https://github.com/oxc-project/bench-javascript-parser-written-in-rust" target="_blank" rel="noreferrer">benchmark</a> for more detail.</p><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install crates:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_ast</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_ast</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_parser</span></span></code></pre></div><ul><li>The umbrella crate <a href="https://docs.rs/oxc" target="_blank" rel="noreferrer">oxc</a> exports all public crates from this repository</li><li>The AST and parser crates <a href="https://docs.rs/oxc_ast" target="_blank" rel="noreferrer">oxc_ast</a> and <a href="https://docs.rs/oxc_parser" target="_blank" rel="noreferrer">oxc_parser</a> are production ready</li></ul><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-parser" target="_blank" rel="noreferrer">oxc-parser</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-KvOiP" id="tab-xZkigvR" checked="checked"><label for="tab-xZkigvR">npm</label><input type="radio" name="group-KvOiP" id="tab-gs-yod1"><label for="tab-gs-yod1">pnpm</label><input type="radio" name="group-KvOiP" id="tab-RRUnTBt"><label for="tab-RRUnTBt">yarn</label><input type="radio" name="group-KvOiP" id="tab-f4VgZ2U"><label for="tab-f4VgZ2U">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/guide/usage/parser.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path 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class="VPLink link link" href="/ja/docs/guide/introduction.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>イントロダクション</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/guide/benchmarks.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>ベンチマーク</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-38384e3a><section class="VPSidebarItem level-0 has-active" data-v-38384e3a data-v-1a4376dd><div class="item" role="button" tabindex="0" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><h2 class="text" data-v-1a4376dd>使いかた</h2><!----></div><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/guide/usage/linter.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Linter</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/guide/usage/parser.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Parser</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/guide/usage/resolver.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Resolver</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_guide_usage_resolver" data-v-30a5e70a><div><ul class="AppBadgeList" data-v-095e1027><!--[--><li class="badge" data-v-095e1027><img src="https://img.shields.io/npm/dw/oxc-resolver" alt="npm" data-v-095e1027></li><!--]--></ul><h1 id="resolver" tabindex="-1">Resolver <a class="header-anchor" href="#resolver" aria-label="Permalink to &quot;Resolver&quot;">​</a></h1><p>Node.js Module Resolution.</p><ul><li>Feature complete</li><li>All configuration options are aligned with enhanced-resolve</li></ul><h2 id="installation" tabindex="-1">Installation <a class="header-anchor" href="#installation" aria-label="Permalink to &quot;Installation&quot;">​</a></h2><h3 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h3><p>Install <a href="https://crates.io/oxc_resolver" target="_blank" rel="noreferrer">oxc_resolver</a> crate:</p><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">cargo</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">install</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc_resolver</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">cargo</span><span style="color:#24292E;"> </span><span style="color:#032F62;">install</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc_resolver</span></span></code></pre></div><p>You should also check <a href="https://docs.rs/oxc_resolver" target="_blank" rel="noreferrer">documentation</a>.</p><h3 id="node-js" tabindex="-1">Node.js <a class="header-anchor" href="#node-js" aria-label="Permalink to &quot;Node.js&quot;">​</a></h3><p>Install <a href="https://www.npmjs.com/package/oxc-resolver" target="_blank" rel="noreferrer">oxc-resolver</a>:</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-vFOGo" id="tab-MDR39qy" checked="checked"><label for="tab-MDR39qy">npm</label><input type="radio" name="group-vFOGo" id="tab-8UE___B"><label for="tab-8UE___B">pnpm</label><input type="radio" name="group-vFOGo" id="tab-iE_UGAV"><label for="tab-iE_UGAV">yarn</label><input type="radio" name="group-vFOGo" id="tab-iuqsfL6"><label for="tab-iuqsfL6">bun</label></div><div class="blocks"><div class="language-sh vp-adaptive-theme active"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">npm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">npm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">pnpm</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">pnpm</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">yarn</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">yarn</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div><div class="language-sh vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">sh</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">$</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">bun</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">add</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">-D</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">oxc-parser</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">$</span><span style="color:#24292E;"> </span><span style="color:#032F62;">bun</span><span style="color:#24292E;"> </span><span style="color:#032F62;">add</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">-D</span><span style="color:#24292E;"> </span><span style="color:#032F62;">oxc-parser</span></span></code></pre></div></div></div><h2 id="example" tabindex="-1">Example <a class="header-anchor" href="#example" aria-label="Permalink to &quot;Example&quot;">​</a></h2><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{env, </span><span style="color:#B392F0;">path</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">PathBuf</span><span style="color:#E1E4E8;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">oxc_resolver</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{</span><span style="color:#B392F0;">ResolveOptions</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">Resolver</span><span style="color:#E1E4E8;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">main</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> path </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">env</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">args</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">nth</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">expect</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;require path&quot;</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> request </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">env</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">args</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">nth</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">2</span><span style="color:#E1E4E8;">)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">expect</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;require request&quot;</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> path </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">PathBuf</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">from</span><span style="color:#E1E4E8;">(path)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">canonicalize</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">unwrap</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">println!</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;path: {path:?}&quot;</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">println!</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;request: {request}&quot;</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">match</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Resolver</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">ResolveOptions</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">default</span><span style="color:#E1E4E8;">())</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">resolve</span><span style="color:#E1E4E8;">(path, </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">request) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">Err</span><span style="color:#E1E4E8;">(error) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">println!</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;Error: {error}&quot;</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">Ok</span><span style="color:#E1E4E8;">(resolution) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">println!</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&quot;Resolved: {}&quot;</span><span style="color:#E1E4E8;">, resolution</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">full_path</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">to_string_lossy</span><span style="color:#E1E4E8;">()),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">{env, </span><span style="color:#6F42C1;">path</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">PathBuf</span><span style="color:#24292E;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">oxc_resolver</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">{</span><span style="color:#6F42C1;">ResolveOptions</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">Resolver</span><span style="color:#24292E;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">main</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> path </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">env</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">args</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">nth</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">expect</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;require path&quot;</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> request </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">env</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">args</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">nth</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">2</span><span style="color:#24292E;">)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">expect</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;require request&quot;</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> path </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">PathBuf</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">from</span><span style="color:#24292E;">(path)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">canonicalize</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">unwrap</span><span style="color:#24292E;">();</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;path: {path:?}&quot;</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;request: {request}&quot;</span><span style="color:#24292E;">);</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">match</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Resolver</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">ResolveOptions</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">default</span><span style="color:#24292E;">())</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">resolve</span><span style="color:#24292E;">(path, </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">request) {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Err</span><span style="color:#24292E;">(error) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;Error: {error}&quot;</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Ok</span><span style="color:#24292E;">(resolution) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">println!</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&quot;Resolved: {}&quot;</span><span style="color:#24292E;">, resolution</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">full_path</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">to_string_lossy</span><span style="color:#24292E;">()),</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/guide/usage/resolver.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/guide/usage/parser.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Parser</span></a></div><div class="pager" data-v-c097fc16><!----></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/architecture/minifier.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Modifier</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-38384e3a><section class="VPSidebarItem level-0" data-v-38384e3a data-v-1a4376dd><div class="item" role="button" tabindex="0" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><h2 class="text" data-v-1a4376dd>ECMAScript</h2><!----></div><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/ecmascript/spec.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>仕様</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/ecmascript/grammar.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>文法</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-38384e3a><section class="VPSidebarItem level-0" data-v-38384e3a data-v-1a4376dd><!----><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/performance.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>パフォーマンス</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/ecosystem.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>エコシステム</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/references.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>参考文献</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_learn_architecture_linter" data-v-30a5e70a><div><h1 id="example" tabindex="-1">Example <a class="header-anchor" href="#example" aria-label="Permalink to 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role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_learn_architecture_parser" data-v-30a5e70a><div><h1 id="parser" tabindex="-1">Parser <a class="header-anchor" href="#parser" aria-label="Permalink to &quot;Parser&quot;">​</a></h1><p>Oxc maintains its own AST and parser, which is by far the fastest and most conformant JavaScript and TypeScript (including JSX and TSX) parser written in Rust.</p><p>As the parser often represents a key performance bottleneck in JavaScript tooling, any minor improvements can have a cascading effect on our downstream tools. By developing our parser, we have the opportunity to explore and implement well-researched performance techniques.</p><p>While many existing JavaScript tools rely on [estree] as their AST specification, a notable drawback is its abundance of ambiguous nodes. This ambiguity often leads to confusion during development with [estree].</p><p>The Oxc AST differs slightly from the [estree] AST by removing ambiguous nodes and introducing distinct types. For example, instead of using a generic [estree] <code>Identifier</code>, the Oxc AST provides specific types such as <code>BindingIdentifier</code>, <code>IdentifierReference</code>, and <code>IdentifierName</code>.</p><p>This clear distinction greatly enhances the development experience by aligning more closely with the ECMAScript specification.</p><h2 id="how-is-it-so-fast" tabindex="-1">How is it so fast <a class="header-anchor" href="#how-is-it-so-fast" aria-label="Permalink to &quot;How is it so fast&quot;">​</a></h2><ul><li>AST is allocated in a <a href="https://crates.io/crates/bumpalo" target="_blank" rel="noreferrer">memory arena</a> for fast AST memory allocation and deallocation</li><li>Short strings are inlined by <a href="https://crates.io/crates/compact_str" target="_blank" rel="noreferrer">CompactString</a></li><li>No other heap allocations are done except the above two</li><li>Scope binding, symbol resolution and some syntax errors are not done in the parser, they are delegated to the semantic analyzer</li></ul></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/learn/architecture/parser.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/learn/architecture/introduction.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>イントロダクション</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/ja/docs/learn/architecture/linter.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>Linter</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/architecture/minifier.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>Modifier</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-38384e3a><section class="VPSidebarItem level-0" data-v-38384e3a data-v-1a4376dd><div class="item" role="button" tabindex="0" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><h2 class="text" data-v-1a4376dd>ECMAScript</h2><!----></div><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/ecmascript/spec.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>仕様</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/ecmascript/grammar.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>文法</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-38384e3a><section class="VPSidebarItem level-0" data-v-38384e3a data-v-1a4376dd><!----><div class="items" data-v-1a4376dd><!--[--><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/performance.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>パフォーマンス</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/ecosystem.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>エコシステム</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/references.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>参考文献</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" 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data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>エコシステム</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/references.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>参考文献</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_learn_ecmascript_grammar" data-v-30a5e70a><div><p>JavaScript has one of the most challenging grammar to parse, this tutorial details all the sweat and tears I had while learning it.</p><h2 id="ll-1-grammar" tabindex="-1">LL(1) Grammar <a class="header-anchor" href="#ll-1-grammar" aria-label="Permalink to &quot;LL(1) Grammar&quot;">​</a></h2><p>According to <a href="https://en.wikipedia.org/wiki/LL_grammar" target="_blank" rel="noreferrer">Wikipedia</a>,</p><blockquote><p>an LL grammar is a context-free grammar that can be parsed by an LL parser, which parses the input from Left to right</p></blockquote><p>The first <strong>L</strong> means the scanning the source from <strong>L</strong>eft to right, and the second <strong>L</strong> means the construction of a <strong>L</strong>eftmost derivation tree.</p><p>Context-free and the (1) in LL(1) means a tree can be constructed by just peeking at the next token and nothing else.</p><p>LL Grammars are of particular interest in academia because we are lazy human beings and we want to write programs that generate parsers automatically so we don&#39;t need to write parsers by hand.</p><p>Unfortunately, most industrial programming languages do not have a nice LL(1) grammar, and this applies to JavaScript too.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>Mozilla started the <a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a> project a few years ago and wrote a <a href="https://github.com/mozilla-spidermonkey/jsparagus/tree/master/jsparagus" target="_blank" rel="noreferrer">LALR parser generator in Python</a>. They haven&#39;t updated it much in the past two years and they sent a strong message at the end of <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">js-quirks.md</a></p><blockquote><p>What have we learned today?</p><ul><li>Do not write a JS parser.</li><li>JavaScript has some syntactic horrors in it. But hey, you don&#39;t make the world&#39;s most widely used programming language by avoiding all mistakes. You do it by shipping a serviceable tool, in the right circumstances, for the right users.</li></ul></blockquote></div><hr><p>The only practical way to parse JavaScript is to write a recursive descent parser by hand because of the nature of its grammar, so let&#39;s learn all the quirks in the grammar before we shoot ourselves in the foot.</p><p>The list below starts simple and will become difficult to grasp, so please take grab a coffee and take your time.</p><h2 id="identifiers" tabindex="-1">Identifiers <a class="header-anchor" href="#identifiers" aria-label="Permalink to &quot;Identifiers&quot;">​</a></h2><p>There are three types of identifiers defined in <code>#sec-identifiers</code>,</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">IdentifierReference[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">BindingIdentifier[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">LabelIdentifier[Yield, Await] :</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">IdentifierReference[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">BindingIdentifier[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">LabelIdentifier[Yield, Await] :</span></span></code></pre></div><p><code>estree</code> and some ASTs do not distinguish the above identifiers, and the specification does not explain them in plain text.</p><p><code>BindingIdentifier</code>s are declarations and <code>IdentifierReference</code>s are references to binding identifiers. For example in <code>var foo = bar</code>, <code>foo</code> is a <code>BindingIdentifier</code> and <code>bar</code> is a <code>IdentifierReference</code> in the grammar:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">VariableDeclaration[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    BindingIdentifier[?Yield, ?Await] Initializer[?In, ?Yield, ?Await] opt</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Initializer[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    = AssignmentExpression[?In, ?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">VariableDeclaration[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    BindingIdentifier[?Yield, ?Await] Initializer[?In, ?Yield, ?Await] opt</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Initializer[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    = AssignmentExpression[?In, ?Yield, ?Await]</span></span></code></pre></div><p>follow <code>AssignmentExpression</code> into <code>PrimaryExpression</code> we get</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">PrimaryExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    IdentifierReference[?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">PrimaryExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    IdentifierReference[?Yield, ?Await]</span></span></code></pre></div><p>Declaring these identifiers differently in the AST will greatly simply downstream tools, especially for semantic analysis.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">BindingIdentifier</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> name</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Atom</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">IdentifierReference</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> name</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Atom</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">BindingIdentifier</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> name</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Atom</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">IdentifierReference</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> name</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Atom</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><hr><h2 id="class-and-strict-mode" tabindex="-1">Class and Strict Mode <a class="header-anchor" href="#class-and-strict-mode" aria-label="Permalink to &quot;Class and Strict Mode&quot;">​</a></h2><p>ECMAScript Class is born after strict mode, so they decided that everything inside a class must be strict mode for simplicity. It is stated as such in <code>#sec-class-definitions</code> with just a <code>Node: A class definition is always strict mode code.</code></p><p>It is easy to declare strict mode by associating it with function scopes, but a <code>class</code> declaration does not have a scope, we need to keep an extra state just for parsing classes.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/swc-project/swc/blob/f9c4eff94a133fa497778328fa0734aa22d5697c/crates/swc_ecma_parser/src/parser/class_and_fn.rs#L85</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/swc-project/swc/blob/f9c4eff94a133fa497778328fa0734aa22d5697c/crates/swc_ecma_parser/src/parser/class_and_fn.rs#L85</span></span></code></pre></div><hr><h2 id="legacy-octal-and-use-strict" tabindex="-1">Legacy Octal and Use Strict <a class="header-anchor" href="#legacy-octal-and-use-strict" aria-label="Permalink to &quot;Legacy Octal and Use Strict&quot;">​</a></h2><p><code>#sec-string-literals-early-errors</code> disallows escaped legacy octal inside strings <code>&quot;\01&quot;</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">EscapeSequence ::</span></span>
+<span class="line"><span style="color:#e1e4e8;">    LegacyOctalEscapeSequence</span></span>
+<span class="line"><span style="color:#e1e4e8;">    NonOctalDecimalEscapeSequence</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">It is a Syntax Error if the source text matched by this production is strict mode code.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">EscapeSequence ::</span></span>
+<span class="line"><span style="color:#24292e;">    LegacyOctalEscapeSequence</span></span>
+<span class="line"><span style="color:#24292e;">    NonOctalDecimalEscapeSequence</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">It is a Syntax Error if the source text matched by this production is strict mode code.</span></span></code></pre></div><p>The best place to detect this is inside the lexer, it can ask the parser for strict mode state and throw errors accordingly.</p><p>But, this becomes impossible when mixed with directives:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">https</span><span style="color:#E1E4E8;">:</span><span style="color:#6A737D;">//github.com/tc39/test262/blob/747bed2e8aaafe8fdf2c65e8a10dd7ae64f66c47/test/language/literals/string/legacy-octal-escape-sequence-prologue-strict.js#L16-L19</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">https</span><span style="color:#24292E;">:</span><span style="color:#6A737D;">//github.com/tc39/test262/blob/747bed2e8aaafe8fdf2c65e8a10dd7ae64f66c47/test/language/literals/string/legacy-octal-escape-sequence-prologue-strict.js#L16-L19</span></span></code></pre></div><p><code>use strict</code> is declared after the escaped legacy octal, yet the syntax error needs to be thrown. Fortunately, no real code uses directives with legacy octals ... unless you want to pass the test262 case from above.</p><hr><h2 id="non-simple-parameter-and-strict-mode" tabindex="-1">Non-simple Parameter and Strict Mode <a class="header-anchor" href="#non-simple-parameter-and-strict-mode" aria-label="Permalink to &quot;Non-simple Parameter and Strict Mode&quot;">​</a></h2><p>Identical function parameters is allowed in non-strict mode <code>function foo(a, a) { }</code>, and we can forbid this by adding <code>use strict</code>: <code>function foo(a, a) { &quot;use strict&quot; }</code>. Later on in es6, other grammars were added to function parameters, for example <code>function foo({ a }, b = c) {}</code>.</p><p>Now, what happens if we write the following where &quot;01&quot; is a strict mode error?</p><div class="language-javaScript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javaScript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">(</span><span style="color:#FFAB70;">value</span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;">() { </span><span style="color:#F97583;">return</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;</span><span style="color:#79B8FF;">\01</span><span style="color:#9ECBFF;">&quot;</span><span style="color:#E1E4E8;"> }())) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#9ECBFF;">&quot;use strict&quot;</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">return</span><span style="color:#E1E4E8;"> value;</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">(</span><span style="color:#E36209;">value</span><span style="color:#D73A49;">=</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">function</span><span style="color:#24292E;">() { </span><span style="color:#D73A49;">return</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;</span><span style="color:#005CC5;">\01</span><span style="color:#032F62;">&quot;</span><span style="color:#24292E;"> }())) {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#032F62;">&quot;use strict&quot;</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">return</span><span style="color:#24292E;"> value;</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>More specifically, what should we do if there is a strict mode syntax error inside the parameters thinking from the parser perspective? So in <code>#sec-function-definitions-static-semantics-early-errors</code>, it just bans this by stating</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">FunctionDeclaration :</span></span>
+<span class="line"><span style="color:#e1e4e8;">FunctionExpression :</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">It is a Syntax Error if FunctionBodyContainsUseStrict of FunctionBody is true and IsSimpleParameterList of FormalParameters is false.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">FunctionDeclaration :</span></span>
+<span class="line"><span style="color:#24292e;">FunctionExpression :</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">It is a Syntax Error if FunctionBodyContainsUseStrict of FunctionBody is true and IsSimpleParameterList of FormalParameters is false.</span></span></code></pre></div><p>Chrome throws this error with a mysterious message &quot;Uncaught SyntaxError: Illegal &#39;use strict&#39; directive in function with non-simple parameter list&quot;.</p><p>A more in-depth explanation is described in <a href="https://humanwhocodes.com/blog/2016/10/the-ecmascript-2016-change-you-probably-dont-know/" target="_blank" rel="noreferrer">this blog post</a> by the author of ESLint.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>Fun fact, the above rule does not apply if we are targeting <code>es5</code> in TypeScript, it transpiles to</p><div class="language-javaScript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javaScript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">(</span><span style="color:#FFAB70;">a</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">b</span><span style="color:#E1E4E8;">) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#9ECBFF;">&quot;use strict&quot;</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> (b </span><span style="color:#F97583;">===</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">void</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">0</span><span style="color:#E1E4E8;">) { b </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;</span><span style="color:#79B8FF;">\01</span><span style="color:#9ECBFF;">&quot;</span><span style="color:#E1E4E8;">; }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">(</span><span style="color:#E36209;">a</span><span style="color:#24292E;">, </span><span style="color:#E36209;">b</span><span style="color:#24292E;">) {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#032F62;">&quot;use strict&quot;</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> (b </span><span style="color:#D73A49;">===</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">void</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">0</span><span style="color:#24292E;">) { b </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;</span><span style="color:#005CC5;">\01</span><span style="color:#032F62;">&quot;</span><span style="color:#24292E;">; }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div></div><hr><h2 id="parenthesized-expression" tabindex="-1">Parenthesized Expression <a class="header-anchor" href="#parenthesized-expression" aria-label="Permalink to &quot;Parenthesized Expression&quot;">​</a></h2><p>Parenthesized expressions are supposed to not have any semantic meanings? For instance the AST for <code>((x))</code> can just be a single <code>IdentifierReference</code>, not <code>ParenthesizedExpression</code> -&gt; <code>ParenthesizedExpression</code> -&gt; <code>IdentifierReference</code>. And this is the case for JavaScript grammar.</p><p>But ... who would have thought it can have run-time meanings. Found in <a href="https://github.com/estree/estree/issues/194" target="_blank" rel="noreferrer">this estree issue</a>, it shows that</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> () {};</span></span>
+<span class="line"><span style="color:#F97583;">&gt;</span><span style="color:#E1E4E8;"> fn.name</span></span>
+<span class="line"><span style="color:#F97583;">&lt;</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;fn&quot;</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">&gt;</span><span style="color:#E1E4E8;"> (fn) </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> () {};</span></span>
+<span class="line"><span style="color:#F97583;">&gt;</span><span style="color:#E1E4E8;"> fn.name</span></span>
+<span class="line"><span style="color:#F97583;">&lt;</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&#39;&#39;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">fn</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> () {};</span></span>
+<span class="line"><span style="color:#D73A49;">&gt;</span><span style="color:#24292E;"> fn.name</span></span>
+<span class="line"><span style="color:#D73A49;">&lt;</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;fn&quot;</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">&gt;</span><span style="color:#24292E;"> (fn) </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> () {};</span></span>
+<span class="line"><span style="color:#D73A49;">&gt;</span><span style="color:#24292E;"> fn.name</span></span>
+<span class="line"><span style="color:#D73A49;">&lt;</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&#39;&#39;</span></span></code></pre></div><p>So eventually acorn and babel added the <code>preserveParens</code> option for compatibility.</p><hr><h2 id="function-declaration-in-if-statement" tabindex="-1">Function Declaration in If Statement <a class="header-anchor" href="#function-declaration-in-if-statement" aria-label="Permalink to &quot;Function Declaration in If Statement&quot;">​</a></h2><p>If we follow the grammar precisely in <code>#sec-ecmascript-language-statements-and-declarations</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">Statement[Yield, Await, Return] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ... lots of statements</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Declaration[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ... declarations</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">Statement[Yield, Await, Return] :</span></span>
+<span class="line"><span style="color:#24292e;">    ... lots of statements</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Declaration[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ... declarations</span></span></code></pre></div><p>The <code>Statement</code> node we define for our AST would obviously not contain <code>Declaration</code>,</p><p>but in Annex B <code>#sec-functiondeclarations-in-ifstatement-statement-clauses</code>, it allows declaration inside the statement position of <code>if</code> statements in non-strict mode:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> (x) </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">() {}</span></span>
+<span class="line"><span style="color:#F97583;">else</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bar</span><span style="color:#E1E4E8;">() {}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">if</span><span style="color:#24292E;"> (x) </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">() {}</span></span>
+<span class="line"><span style="color:#D73A49;">else</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bar</span><span style="color:#24292E;">() {}</span></span></code></pre></div><hr><h2 id="label-statement-is-legit" tabindex="-1">Label statement is legit <a class="header-anchor" href="#label-statement-is-legit" aria-label="Permalink to &quot;Label statement is legit&quot;">​</a></h2><p>We probably have never written a single line of labelled statement, but it is legit in modern JavaScript and not banned by strict mode.</p><p>The following syntax is correct, it returns a labelled statement (not object literal).</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">&lt;</span><span style="color:#79B8FF;">Foo</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#B392F0;">bar</span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;">{() </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">baz</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">&quot;quaz&quot;</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">  }}</span></span>
+<span class="line"><span style="color:#E1E4E8;">/&gt;</span></span>
+<span class="line"><span style="color:#6A737D;">//   ^^^^^^^^^^^ `LabelledStatement`</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">&lt;</span><span style="color:#005CC5;">Foo</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#6F42C1;">bar</span><span style="color:#D73A49;">=</span><span style="color:#24292E;">{() </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">baz</span><span style="color:#24292E;">: </span><span style="color:#032F62;">&quot;quaz&quot;</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">  }}</span></span>
+<span class="line"><span style="color:#24292E;">/&gt;</span></span>
+<span class="line"><span style="color:#6A737D;">//   ^^^^^^^^^^^ `LabelledStatement`</span></span></code></pre></div><hr><h2 id="let-is-not-a-keyword" tabindex="-1"><code>let</code> is not a keyword <a class="header-anchor" href="#let-is-not-a-keyword" aria-label="Permalink to &quot;`let` is not a keyword&quot;">​</a></h2><p><code>let</code> is not a keyword so it is allowed to appear anywhere unless the grammar explicitly states <code>let</code> is not allowed in such positions. Parsers need to peek at the token after the <code>let</code> token and decide what it needs to be parsed into, e.g.:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> a;</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> foo;</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> instanceof x;</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> + 1;</span></span>
+<span class="line"><span style="color:#F97583;">while</span><span style="color:#E1E4E8;"> (</span><span style="color:#79B8FF;">true</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">a </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;">[</span><span style="color:#79B8FF;">0</span><span style="color:#E1E4E8;">];</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> a;</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> foo;</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> instanceof x;</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> + 1;</span></span>
+<span class="line"><span style="color:#D73A49;">while</span><span style="color:#24292E;"> (</span><span style="color:#005CC5;">true</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">let</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">a </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">let</span><span style="color:#24292E;">[</span><span style="color:#005CC5;">0</span><span style="color:#24292E;">];</span></span></code></pre></div><hr><h2 id="for-in-for-of-and-the-in-context" tabindex="-1">For-in / For-of and the [In] context <a class="header-anchor" href="#for-in-for-of-and-the-in-context" aria-label="Permalink to &quot;For-in / For-of and the [In] context&quot;">​</a></h2><p>If we look at the grammar for <code>for-in</code> and <code>for-of</code> in <code>#prod-ForInOfStatement</code>, it is immediately confusing to understand how to parse these.</p><p>There are two major obstacles for us to understand: the <code>[lookahead ≠ let]</code> part and the <code>[+In]</code> part.</p><p>If we have parsed to <code>for (let</code>, we need to check the peeking token is:</p><ul><li>not <code>in</code> to disallow <code>for (let in)</code></li><li>is <code>{</code>, <code>[</code> or an identifier to allow <code>for (let {} = foo)</code>, <code>for (let [] = foo)</code> and <code>for (let bar = foo)</code></li></ul><p>Once reached the <code>of</code> or <code>in</code> keyword, the right-hand side expression needs to be passed with the correct [+In] context to disallow the two <code>in</code> expressions in <code>#prod-RelationalExpression</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">RelationalExpression[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    [+In] RelationalExpression[+In, ?Yield, ?Await] in ShiftExpression[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;">    [+In] PrivateIdentifier in ShiftExpression[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Note 2: The [In] grammar parameter is needed to avoid confusing the in operator in a relational expression with the in operator in a for statement.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">RelationalExpression[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    [+In] RelationalExpression[+In, ?Yield, ?Await] in ShiftExpression[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;">    [+In] PrivateIdentifier in ShiftExpression[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Note 2: The [In] grammar parameter is needed to avoid confusing the in operator in a relational expression with the in operator in a for statement.</span></span></code></pre></div><p>And this is the only application for the <code>[In]</code> context in the entire specification.</p><p>Also to note, the grammar <code>[lookahead ∉ { let, async of }]</code> forbids <code>for (async of ...)</code>, and it needs to be explicitly guarded against.</p><hr><h2 id="block-level-function-declarations" tabindex="-1">Block-Level Function Declarations <a class="header-anchor" href="#block-level-function-declarations" aria-label="Permalink to &quot;Block-Level Function Declarations&quot;">​</a></h2><p>In Annex B.3.2 <code>#sec-block-level-function-declarations-web-legacy-compatibility-semantics</code>, an entire page is dedicated to explain how <code>FunctionDeclaration</code> is supposed to behave in <code>Block</code> statements. It boils down to</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">https</span><span style="color:#E1E4E8;">:</span><span style="color:#6A737D;">//github.com/acornjs/acorn/blob/11735729c4ebe590e406f952059813f250a4cbd1/acorn/src/scope.js#L30-L35</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">https</span><span style="color:#24292E;">:</span><span style="color:#6A737D;">//github.com/acornjs/acorn/blob/11735729c4ebe590e406f952059813f250a4cbd1/acorn/src/scope.js#L30-L35</span></span></code></pre></div><p>The name of a <code>FunctionDeclaration</code> needs to be treated the same as a <code>var</code> declaration if its inside a function declaration. This code snippet errors with a re-declaration error since <code>bar</code> is inside a block scope:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> (</span><span style="color:#79B8FF;">true</span><span style="color:#E1E4E8;">) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bar</span><span style="color:#E1E4E8;">() {} </span><span style="color:#6A737D;">// redeclaration error</span></span>
+<span class="line"><span style="color:#E1E4E8;">  }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> (</span><span style="color:#005CC5;">true</span><span style="color:#24292E;">) {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">var</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bar</span><span style="color:#24292E;">() {} </span><span style="color:#6A737D;">// redeclaration error</span></span>
+<span class="line"><span style="color:#24292E;">  }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>meanwhile, the following does not error because it is inside a function scope, function <code>bar</code> is treated as a var declaration:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">foo</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">function</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bar</span><span style="color:#E1E4E8;">() {}</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">foo</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">var</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">function</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bar</span><span style="color:#24292E;">() {}</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><hr><h2 id="grammar-context" tabindex="-1">Grammar Context <a class="header-anchor" href="#grammar-context" aria-label="Permalink to &quot;Grammar Context&quot;">​</a></h2><p>The syntactic grammar has 5 context parameters for allowing and disallowing certain constructs, namely <code>[In]</code>, <code>[Return]</code>, <code>[Yield]</code>, <code>[Await]</code> and <code>[Default]</code>.</p><p>It is best to keep a context during parsing, for example in Rome:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">https</span><span style="color:#F97583;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/5a059c0413baf1d54436ac0c149a829f0dfd1f4d/crates/rome_js_parser/src/state.rs#L404-L425</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">https</span><span style="color:#D73A49;">:</span><span style="color:#6A737D;">//github.com/rome/tools/blob/5a059c0413baf1d54436ac0c149a829f0dfd1f4d/crates/rome_js_parser/src/state.rs#L404-L425</span></span></code></pre></div><p>And toggle and check these flags accordingly by following the grammar.</p><h2 id="assignmentpattern-vs-bindingpattern" tabindex="-1">AssignmentPattern vs BindingPattern <a class="header-anchor" href="#assignmentpattern-vs-bindingpattern" aria-label="Permalink to &quot;AssignmentPattern vs BindingPattern&quot;">​</a></h2><p>In <code>estree</code>, the left-hand side of an <code>AssignmentExpression</code> is a <code>Pattern</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">extend interface AssignmentExpression {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    left: Pattern;</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">extend interface AssignmentExpression {</span></span>
+<span class="line"><span style="color:#24292e;">    left: Pattern;</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span></code></pre></div><p>and the left-hand side of a <code>VariableDeclarator</code> is a <code>Pattern</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">interface VariableDeclarator &lt;: Node {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    type: &quot;VariableDeclarator&quot;;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    id: Pattern;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    init: Expression | null;</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">interface VariableDeclarator &lt;: Node {</span></span>
+<span class="line"><span style="color:#24292e;">    type: &quot;VariableDeclarator&quot;;</span></span>
+<span class="line"><span style="color:#24292e;">    id: Pattern;</span></span>
+<span class="line"><span style="color:#24292e;">    init: Expression | null;</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span></code></pre></div><p>A <code>Pattern</code> can be a <code>Identifier</code>, <code>ObjectPattern</code>, <code>ArrayPattern</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">interface Identifier &lt;: Expression, Pattern {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    type: &quot;Identifier&quot;;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    name: string;</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">interface ObjectPattern &lt;: Pattern {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    type: &quot;ObjectPattern&quot;;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    properties: [ AssignmentProperty ];</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">interface ArrayPattern &lt;: Pattern {</span></span>
+<span class="line"><span style="color:#e1e4e8;">    type: &quot;ArrayPattern&quot;;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    elements: [ Pattern | null ];</span></span>
+<span class="line"><span style="color:#e1e4e8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">interface Identifier &lt;: Expression, Pattern {</span></span>
+<span class="line"><span style="color:#24292e;">    type: &quot;Identifier&quot;;</span></span>
+<span class="line"><span style="color:#24292e;">    name: string;</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">interface ObjectPattern &lt;: Pattern {</span></span>
+<span class="line"><span style="color:#24292e;">    type: &quot;ObjectPattern&quot;;</span></span>
+<span class="line"><span style="color:#24292e;">    properties: [ AssignmentProperty ];</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">interface ArrayPattern &lt;: Pattern {</span></span>
+<span class="line"><span style="color:#24292e;">    type: &quot;ArrayPattern&quot;;</span></span>
+<span class="line"><span style="color:#24292e;">    elements: [ Pattern | null ];</span></span>
+<span class="line"><span style="color:#24292e;">}</span></span></code></pre></div><p>But from the specification perspective, we have the following JavaScript:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#6A737D;">// AssignmentExpression:</span></span>
+<span class="line"><span style="color:#E1E4E8;">{ foo } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">^^^</span><span style="color:#E1E4E8;"> IdentifierReference</span></span>
+<span class="line"><span style="color:#E1E4E8;">[ foo ] </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">  </span><span style="color:#F97583;">^^^</span><span style="color:#E1E4E8;"> IdentifierReference</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6A737D;">// VariableDeclarator</span></span>
+<span class="line"><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> { foo } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#F97583;">^^^</span><span style="color:#E1E4E8;"> BindingIdentifier</span></span>
+<span class="line"><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> [ foo ] </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> bar;</span></span>
+<span class="line"><span style="color:#E1E4E8;">      </span><span style="color:#F97583;">^^^</span><span style="color:#E1E4E8;"> BindingIdentifier</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6A737D;">// AssignmentExpression:</span></span>
+<span class="line"><span style="color:#24292E;">{ foo } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">^^^</span><span style="color:#24292E;"> IdentifierReference</span></span>
+<span class="line"><span style="color:#24292E;">[ foo ] </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">  </span><span style="color:#D73A49;">^^^</span><span style="color:#24292E;"> IdentifierReference</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6A737D;">// VariableDeclarator</span></span>
+<span class="line"><span style="color:#D73A49;">var</span><span style="color:#24292E;"> { foo } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#D73A49;">^^^</span><span style="color:#24292E;"> BindingIdentifier</span></span>
+<span class="line"><span style="color:#D73A49;">var</span><span style="color:#24292E;"> [ foo ] </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> bar;</span></span>
+<span class="line"><span style="color:#24292E;">      </span><span style="color:#D73A49;">^^^</span><span style="color:#24292E;"> BindingIdentifier</span></span></code></pre></div><p>This starts to become confusing because we now have a situation where we cannot directly distinguish whether the <code>Identifier</code> is a <code>BindingIdentifier</code> or a <code>IdentifierReference</code> inside a <code>Pattern</code>:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Pattern</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Identifier</span><span style="color:#E1E4E8;">,</span><span style="color:#6A737D;"> // Is this a `BindingIdentifier` or a `IdentifierReference`?</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ArrayPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ObjectPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Pattern</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Identifier</span><span style="color:#24292E;">,</span><span style="color:#6A737D;"> // Is this a `BindingIdentifier` or a `IdentifierReference`?</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ArrayPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ObjectPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>This will lead to all sorts of unnecessary code further down the parser pipeline. For example, when setting up the scope for semantic analysis, we need to inspect the parents of this <code>Identifier</code> to determine whether we should bind it to the scope or not.</p><p>A better solution is to fully understand the specification and decide what to do.</p><p>The grammar for <code>AssignmentExpression</code> and <code>VariableDeclaration</code> are defined as:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">13.15 Assignment Operators</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">AssignmentExpression[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    LeftHandSideExpression[?Yield, ?Await] = AssignmentExpression[?In, ?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">13.15.5 Destructuring Assignment</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">In certain circumstances when processing an instance of the production</span></span>
+<span class="line"><span style="color:#e1e4e8;">AssignmentExpression : LeftHandSideExpression = AssignmentExpression</span></span>
+<span class="line"><span style="color:#e1e4e8;">the interpretation of LeftHandSideExpression is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">AssignmentPattern[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ObjectAssignmentPattern[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ArrayAssignmentPattern[?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">13.15 Assignment Operators</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">AssignmentExpression[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    LeftHandSideExpression[?Yield, ?Await] = AssignmentExpression[?In, ?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">13.15.5 Destructuring Assignment</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">In certain circumstances when processing an instance of the production</span></span>
+<span class="line"><span style="color:#24292e;">AssignmentExpression : LeftHandSideExpression = AssignmentExpression</span></span>
+<span class="line"><span style="color:#24292e;">the interpretation of LeftHandSideExpression is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">AssignmentPattern[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ObjectAssignmentPattern[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;">    ArrayAssignmentPattern[?Yield, ?Await]</span></span></code></pre></div><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">14.3.2 Variable Statement</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">VariableDeclaration[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    BindingIdentifier[?Yield, ?Await] Initializer[?In, ?Yield, ?Await]opt</span></span>
+<span class="line"><span style="color:#e1e4e8;">    BindingPattern[?Yield, ?Await] Initializer[?In, ?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">14.3.2 Variable Statement</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">VariableDeclaration[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    BindingIdentifier[?Yield, ?Await] Initializer[?In, ?Yield, ?Await]opt</span></span>
+<span class="line"><span style="color:#24292e;">    BindingPattern[?Yield, ?Await] Initializer[?In, ?Yield, ?Await]</span></span></code></pre></div><p>The specification distinguishes this two grammar by defining them separately with an <code>AssignmentPattern</code> and a <code>BindingPattern</code>.</p><p>So in situations like this, do not be afraid to deviate from <code>estree</code> and define extra AST nodes for our parser:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">BindingPattern</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">BindingIdentifier</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ObjectBindingPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ArrayBindingPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AssignmentPattern</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">IdentifierReference</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ObjectAssignmentPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ArrayAssignmentPattern</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">BindingPattern</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">BindingIdentifier</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ObjectBindingPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ArrayBindingPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AssignmentPattern</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">IdentifierReference</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ObjectAssignmentPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ArrayAssignmentPattern</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>I was in a super confusing state for a whole week until I finally reached enlightenment: we need to define an <code>AssignmentPattern</code> node and a <code>BindingPattern</code> node instead of a single <code>Pattern</code> node.</p><ul><li><code>estree</code> must be correct because people have been using it for years so it cannot be wrong?</li><li>how are we going to cleanly distinguish the <code>Identifier</code>s inside the patterns without defining two separate nodes? I just cannot find where the grammar is?</li><li>After a whole day of navigating the specification ... the grammar for <code>AssignmentPattern</code> is in the 5th subsection of the main section &quot;13.15 Assignment Operators&quot; with the subtitle &quot;Supplemental Syntax&quot; 🤯 - this is really out of place because all grammar is defined in the main section, not like this one defined after the &quot;Runtime Semantics&quot; section</li></ul><hr><p>:::caution The following cases are really difficult to grasp. Here be dragons. :::</p><h2 id="ambiguous-grammar" tabindex="-1">Ambiguous Grammar <a class="header-anchor" href="#ambiguous-grammar" aria-label="Permalink to &quot;Ambiguous Grammar&quot;">​</a></h2><p>Let&#39;s first think like a parser and solve the problem - given the <code>/</code> token, is it a division operator or the start of a regex expression?</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">a </span><span style="color:#F97583;">/</span><span style="color:#E1E4E8;"> b;</span></span>
+<span class="line"><span style="color:#E1E4E8;">a </span><span style="color:#F97583;">/</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;"> regex </span><span style="color:#9ECBFF;">/</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">a </span><span style="color:#F97583;">/=</span><span style="color:#DBEDFF;"> </span><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;"> regex </span><span style="color:#9ECBFF;">/</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;"> regex </span><span style="color:#9ECBFF;">/</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">/</span><span style="color:#E1E4E8;"> b;</span></span>
+<span class="line"><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;">=</span><span style="color:#9ECBFF;">/</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">/</span><span style="color:#DBEDFF;"> </span><span style="color:#9ECBFF;">/</span><span style="color:#F97583;">=/</span><span style="color:#E1E4E8;">;</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">a </span><span style="color:#D73A49;">/</span><span style="color:#24292E;"> b;</span></span>
+<span class="line"><span style="color:#24292E;">a </span><span style="color:#D73A49;">/</span><span style="color:#24292E;"> </span><span style="color:#032F62;">/ regex /</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">a </span><span style="color:#D73A49;">/=</span><span style="color:#032F62;"> / regex /</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#032F62;">/ regex /</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">/</span><span style="color:#24292E;"> b;</span></span>
+<span class="line"><span style="color:#032F62;">/=/</span><span style="color:#24292E;"> </span><span style="color:#032F62;">/ /</span><span style="color:#D73A49;">=/</span><span style="color:#24292E;">;</span></span></code></pre></div><p>It is almost impossible, isn&#39;t it? Let&#39;s break these down and follow the grammar.</p><p>The first thing we need to understand is that the syntactic grammar drives the lexical grammar as stated in <code>#sec-ecmascript-language-lexical-grammar</code></p><blockquote><p>There are several situations where the identification of lexical input elements is sensitive to the syntactic grammar context that is consuming the input elements.</p></blockquote><p>This means that the parser is responsible for telling the lexer which token to return next. The above example indicates that the lexer needs to return either a <code>/</code> token or a <code>RegExp</code> token. For getting the correct <code>/</code> or <code>RegExp</code> token, the specification says:</p><blockquote><p>The InputElementRegExp goal symbol is used in all syntactic grammar contexts where a RegularExpressionLiteral is permitted ... In all other contexts, InputElementDiv is used as the lexical goal symbol.</p></blockquote><p>And the syntax for <code>InputElementDiv</code> and <code>InputElementRegExp</code> are</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">InputElementDiv ::</span></span>
+<span class="line"><span style="color:#e1e4e8;">    WhiteSpace</span></span>
+<span class="line"><span style="color:#e1e4e8;">    LineTerminator</span></span>
+<span class="line"><span style="color:#e1e4e8;">    Comment</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CommonToken</span></span>
+<span class="line"><span style="color:#e1e4e8;">    DivPunctuator &lt;---------- the `/` and `/=` token</span></span>
+<span class="line"><span style="color:#e1e4e8;">    RightBracePunctuator</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">InputElementRegExp ::</span></span>
+<span class="line"><span style="color:#e1e4e8;">    WhiteSpace</span></span>
+<span class="line"><span style="color:#e1e4e8;">    LineTerminator</span></span>
+<span class="line"><span style="color:#e1e4e8;">    Comment</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CommonToken</span></span>
+<span class="line"><span style="color:#e1e4e8;">    RightBracePunctuator</span></span>
+<span class="line"><span style="color:#e1e4e8;">    RegularExpressionLiteral &lt;-------- the `RegExp` token</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">InputElementDiv ::</span></span>
+<span class="line"><span style="color:#24292e;">    WhiteSpace</span></span>
+<span class="line"><span style="color:#24292e;">    LineTerminator</span></span>
+<span class="line"><span style="color:#24292e;">    Comment</span></span>
+<span class="line"><span style="color:#24292e;">    CommonToken</span></span>
+<span class="line"><span style="color:#24292e;">    DivPunctuator &lt;---------- the `/` and `/=` token</span></span>
+<span class="line"><span style="color:#24292e;">    RightBracePunctuator</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">InputElementRegExp ::</span></span>
+<span class="line"><span style="color:#24292e;">    WhiteSpace</span></span>
+<span class="line"><span style="color:#24292e;">    LineTerminator</span></span>
+<span class="line"><span style="color:#24292e;">    Comment</span></span>
+<span class="line"><span style="color:#24292e;">    CommonToken</span></span>
+<span class="line"><span style="color:#24292e;">    RightBracePunctuator</span></span>
+<span class="line"><span style="color:#24292e;">    RegularExpressionLiteral &lt;-------- the `RegExp` token</span></span></code></pre></div><p>This means whenever the grammar reaches <code>RegularExpressionLiteral</code>, <code>/</code> need to be tokenized as a <code>RegExp</code> token (and throw an error if it does not have a matching <code>/</code>). All other cases we&#39;ll tokenize <code>/</code> as a slash token.</p><p>Let&#39;s walk through an example:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">a / / regex /</span></span>
+<span class="line"><span style="color:#e1e4e8;">^ ------------ PrimaryExpression:: IdentifierReference</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ^ ---------- MultiplicativeExpression: MultiplicativeExpression MultiplicativeOperator ExponentiationExpression</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ^^^^^^^^ - PrimaryExpression: RegularExpressionLiteral</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">a / / regex /</span></span>
+<span class="line"><span style="color:#24292e;">^ ------------ PrimaryExpression:: IdentifierReference</span></span>
+<span class="line"><span style="color:#24292e;">  ^ ---------- MultiplicativeExpression: MultiplicativeExpression MultiplicativeOperator ExponentiationExpression</span></span>
+<span class="line"><span style="color:#24292e;">    ^^^^^^^^ - PrimaryExpression: RegularExpressionLiteral</span></span></code></pre></div><p>This statement does not match any other start of <code>Statement</code>, so it&#39;ll go down the <code>ExpressionStatement</code> route:</p><p><code>ExpressionStatement</code> --&gt; <code>Expression</code> --&gt; <code>AssignmentExpression</code> --&gt; ... --&gt; <code>MultiplicativeExpression</code> --&gt; ... --&gt; <code>MemberExpression</code> --&gt; <code>PrimaryExpression</code> --&gt; <code>IdentifierReference</code>.</p><p>We stopped at <code>IdentifierReference</code> and not <code>RegularExpressionLiteral</code>, the statement &quot;In all other contexts, InputElementDiv is used as the lexical goal symbol&quot; applies. The first slash is a <code>DivPunctuator</code> token.</p><p>Since this is a <code>DivPunctuator</code> token, the grammar <code>MultiplicativeExpression: MultiplicativeExpression MultiplicativeOperator ExponentiationExpression</code> is matched, the right-hand side is expected to be an <code>ExponentiationExpression</code>.</p><p>Now we are at the second slash in <code>a / /</code>. By following <code>ExponentiationExpression</code>, we reach <code>PrimaryExpression: RegularExpressionLiteral</code> because <code>RegularExpressionLiteral</code> is the only matching grammar with a <code>/</code>:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">RegularExpressionLiteral ::</span></span>
+<span class="line"><span style="color:#e1e4e8;">    / RegularExpressionBody / RegularExpressionFlags</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">RegularExpressionLiteral ::</span></span>
+<span class="line"><span style="color:#24292e;">    / RegularExpressionBody / RegularExpressionFlags</span></span></code></pre></div><p>This second <code>/</code> will be tokenized as <code>RegExp</code> because the specification states &quot;The InputElementRegExp goal symbol is used in all syntactic grammar contexts where a RegularExpressionLiteral is permitted&quot;.</p><div class="info custom-block"><p class="custom-block-title">INFO</p><p>As an exercise, try and follow the grammar for <code>/=/ / /=/</code>.</p></div><hr><h2 id="cover-grammar" tabindex="-1">Cover Grammar <a class="header-anchor" href="#cover-grammar" aria-label="Permalink to &quot;Cover Grammar&quot;">​</a></h2><p>Read the <a href="https://v8.dev/blog/understanding-ecmascript-part-4" target="_blank" rel="noreferrer">V8 blog post</a> on this topic first.</p><p>To summarize, the specification states the following three cover grammars:</p><h4 id="coverparenthesizedexpressionandarrowparameterlist" tabindex="-1">CoverParenthesizedExpressionAndArrowParameterList <a class="header-anchor" href="#coverparenthesizedexpressionandarrowparameterlist" aria-label="Permalink to &quot;CoverParenthesizedExpressionAndArrowParameterList&quot;">​</a></h4><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">PrimaryExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#e1e4e8;">PrimaryExpression[Yield, Await] : CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;">    the interpretation of CoverParenthesizedExpressionAndArrowParameterList is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">ParenthesizedExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ( Expression[+In, ?Yield, ?Await] )</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">PrimaryExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#24292e;">PrimaryExpression[Yield, Await] : CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;">    the interpretation of CoverParenthesizedExpressionAndArrowParameterList is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">ParenthesizedExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ( Expression[+In, ?Yield, ?Await] )</span></span></code></pre></div><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ArrowFunction[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ArrowParameters[?Yield, ?Await] [no LineTerminator here] =&gt; ConciseBody[?In]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">ArrowParameters[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    BindingIdentifier[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ArrowFunction[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ArrowParameters[?Yield, ?Await] [no LineTerminator here] =&gt; ConciseBody[?In]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">ArrowParameters[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    BindingIdentifier[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;">    CoverParenthesizedExpressionAndArrowParameterList[?Yield, ?Await]</span></span></code></pre></div><p>These definitions defines:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> foo </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> (a, b, c); </span><span style="color:#6A737D;">// SequenceExpression</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bar</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> (</span><span style="color:#FFAB70;">a</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">b</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">c</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {}; </span><span style="color:#6A737D;">// ArrowExpression</span></span>
+<span class="line"><span style="color:#E1E4E8;">          </span><span style="color:#F97583;">^^^^^^^^^</span><span style="color:#E1E4E8;"> CoverParenthesizedExpressionAndArrowParameterList</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> foo </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> (a, b, c); </span><span style="color:#6A737D;">// SequenceExpression</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bar</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> (</span><span style="color:#E36209;">a</span><span style="color:#24292E;">, </span><span style="color:#E36209;">b</span><span style="color:#24292E;">, </span><span style="color:#E36209;">c</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {}; </span><span style="color:#6A737D;">// ArrowExpression</span></span>
+<span class="line"><span style="color:#24292E;">          </span><span style="color:#D73A49;">^^^^^^^^^</span><span style="color:#24292E;"> CoverParenthesizedExpressionAndArrowParameterList</span></span></code></pre></div><p>A simple but cumbersome approach to solving this problem is to parse it as a <code>Vec&lt;Expression&gt;</code> first, then write a converter function to convert it to <code>ArrowParameters</code> node, i.e. each individual <code>Expression</code> need to be converted to a <code>BindingPattern</code>.</p><p>It should be noted that, if we are building the scope tree within the parser, i.e. create the scope for arrow expression during parsing, but do not create one for a sequence expression, it is not obvious how to do this. <a href="https://github.com/evanw/esbuild" target="_blank" rel="noreferrer">esbuild</a> solved this problem by creating a temporary scope first, and then dropping it if it is not an <code>ArrowExpression</code>.</p><p>This is stated in its <a href="https://github.com/evanw/esbuild/blob/master/docs/architecture.md#symbols-and-scopes" target="_blank" rel="noreferrer">architecture document</a>:</p><blockquote><p>This is mostly pretty straightforward except for a few places where the parser has pushed a scope and is in the middle of parsing a declaration only to discover that it&#39;s not a declaration after all. This happens in TypeScript when a function is forward-declared without a body, and in JavaScript when it&#39;s ambiguous whether a parenthesized expression is an arrow function or not until we reach the =&gt; token afterwards. This would be solved by doing three passes instead of two so we finish parsing before starting to set up scopes and declare symbols, but we&#39;re trying to do this in just two passes. So instead we call popAndDiscardScope() or popAndFlattenScope() instead of popScope() to modify the scope tree later if our assumptions turn out to be incorrect.</p></blockquote><hr><h4 id="covercallexpressionandasyncarrowhead" tabindex="-1">CoverCallExpressionAndAsyncArrowHead <a class="header-anchor" href="#covercallexpressionandasyncarrowhead" aria-label="Permalink to &quot;CoverCallExpressionAndAsyncArrowHead&quot;">​</a></h4><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">CallExpression :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverCallExpressionAndAsyncArrowHead</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#e1e4e8;">CallExpression : CoverCallExpressionAndAsyncArrowHead</span></span>
+<span class="line"><span style="color:#e1e4e8;">the interpretation of CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">CallMemberExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">CallExpression :</span></span>
+<span class="line"><span style="color:#24292e;">    CoverCallExpressionAndAsyncArrowHead</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#24292e;">CallExpression : CoverCallExpressionAndAsyncArrowHead</span></span>
+<span class="line"><span style="color:#24292e;">the interpretation of CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">CallMemberExpression[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]</span></span></code></pre></div><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">AsyncArrowFunction[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await] [no LineTerminator here] =&gt; AsyncConciseBody[?In]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">CoverCallExpressionAndAsyncArrowHead[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#e1e4e8;">AsyncArrowFunction : CoverCallExpressionAndAsyncArrowHead =&gt; AsyncConciseBody</span></span>
+<span class="line"><span style="color:#e1e4e8;">the interpretation of CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">AsyncArrowHead :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    async [no LineTerminator here] ArrowFormalParameters[~Yield, +Await]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">AsyncArrowFunction[In, Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    CoverCallExpressionAndAsyncArrowHead[?Yield, ?Await] [no LineTerminator here] =&gt; AsyncConciseBody[?In]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">CoverCallExpressionAndAsyncArrowHead[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">When processing an instance of the production</span></span>
+<span class="line"><span style="color:#24292e;">AsyncArrowFunction : CoverCallExpressionAndAsyncArrowHead =&gt; AsyncConciseBody</span></span>
+<span class="line"><span style="color:#24292e;">the interpretation of CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">AsyncArrowHead :</span></span>
+<span class="line"><span style="color:#24292e;">    async [no LineTerminator here] ArrowFormalParameters[~Yield, +Await]</span></span></code></pre></div><p>These definitions define:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#B392F0;">async</span><span style="color:#E1E4E8;"> (a, b, c); </span><span style="color:#6A737D;">// CallExpression</span></span>
+<span class="line"><span style="color:#F97583;">async</span><span style="color:#E1E4E8;"> (</span><span style="color:#FFAB70;">a</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">b</span><span style="color:#E1E4E8;">, </span><span style="color:#FFAB70;">c</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {} </span><span style="color:#6A737D;">// AsyncArrowFunction</span></span>
+<span class="line"><span style="color:#F97583;">^^^^^^^^^^^^^^^</span><span style="color:#E1E4E8;"> CoverCallExpressionAndAsyncArrowHead</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#6F42C1;">async</span><span style="color:#24292E;"> (a, b, c); </span><span style="color:#6A737D;">// CallExpression</span></span>
+<span class="line"><span style="color:#D73A49;">async</span><span style="color:#24292E;"> (</span><span style="color:#E36209;">a</span><span style="color:#24292E;">, </span><span style="color:#E36209;">b</span><span style="color:#24292E;">, </span><span style="color:#E36209;">c</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {} </span><span style="color:#6A737D;">// AsyncArrowFunction</span></span>
+<span class="line"><span style="color:#D73A49;">^^^^^^^^^^^^^^^</span><span style="color:#24292E;"> CoverCallExpressionAndAsyncArrowHead</span></span></code></pre></div><p>This looks strange because <code>async</code> is not a keyword. The first <code>async</code> is a function name.</p><hr><h4 id="coverinitializedname" tabindex="-1">CoverInitializedName <a class="header-anchor" href="#coverinitializedname" aria-label="Permalink to &quot;CoverInitializedName&quot;">​</a></h4><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">13.2.5 Object Initializer</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">ObjectLiteral[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    ...</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">PropertyDefinition[Yield, Await] :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    CoverInitializedName[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">Note 3: In certain contexts, ObjectLiteral is used as a cover grammar for a more restricted secondary grammar.</span></span>
+<span class="line"><span style="color:#e1e4e8;">The CoverInitializedName production is necessary to fully cover these secondary grammars. However, use of this production results in an early Syntax Error in normal contexts where an actual ObjectLiteral is expected.</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">13.2.5.1 Static Semantics: Early Errors</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">In addition to describing an actual object initializer the ObjectLiteral productions are also used as a cover grammar for ObjectAssignmentPattern and may be recognized as part of a CoverParenthesizedExpressionAndArrowParameterList. When ObjectLiteral appears in a context where ObjectAssignmentPattern is required the following Early Error rules are not applied. In addition, they are not applied when initially parsing a CoverParenthesizedExpressionAndArrowParameterList or CoverCallExpressionAndAsyncArrowHead.</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">PropertyDefinition : CoverInitializedName</span></span>
+<span class="line"><span style="color:#e1e4e8;">    I* t is a Syntax Error if any source text is matched by this production.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">13.2.5 Object Initializer</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">ObjectLiteral[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    ...</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">PropertyDefinition[Yield, Await] :</span></span>
+<span class="line"><span style="color:#24292e;">    CoverInitializedName[?Yield, ?Await]</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">Note 3: In certain contexts, ObjectLiteral is used as a cover grammar for a more restricted secondary grammar.</span></span>
+<span class="line"><span style="color:#24292e;">The CoverInitializedName production is necessary to fully cover these secondary grammars. However, use of this production results in an early Syntax Error in normal contexts where an actual ObjectLiteral is expected.</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">13.2.5.1 Static Semantics: Early Errors</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">In addition to describing an actual object initializer the ObjectLiteral productions are also used as a cover grammar for ObjectAssignmentPattern and may be recognized as part of a CoverParenthesizedExpressionAndArrowParameterList. When ObjectLiteral appears in a context where ObjectAssignmentPattern is required the following Early Error rules are not applied. In addition, they are not applied when initially parsing a CoverParenthesizedExpressionAndArrowParameterList or CoverCallExpressionAndAsyncArrowHead.</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">PropertyDefinition : CoverInitializedName</span></span>
+<span class="line"><span style="color:#24292e;">    I* t is a Syntax Error if any source text is matched by this production.</span></span></code></pre></div><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">13.15.1 Static Semantics: Early Errors</span></span>
+<span class="line"><span style="color:#e1e4e8;"></span></span>
+<span class="line"><span style="color:#e1e4e8;">AssignmentExpression : LeftHandSideExpression = AssignmentExpression</span></span>
+<span class="line"><span style="color:#e1e4e8;">If LeftHandSideExpression is an ObjectLiteral or an ArrayLiteral, the following Early Error rules are applied:</span></span>
+<span class="line"><span style="color:#e1e4e8;">    * LeftHandSideExpression must cover an AssignmentPattern.</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">13.15.1 Static Semantics: Early Errors</span></span>
+<span class="line"><span style="color:#24292e;"></span></span>
+<span class="line"><span style="color:#24292e;">AssignmentExpression : LeftHandSideExpression = AssignmentExpression</span></span>
+<span class="line"><span style="color:#24292e;">If LeftHandSideExpression is an ObjectLiteral or an ArrayLiteral, the following Early Error rules are applied:</span></span>
+<span class="line"><span style="color:#24292e;">    * LeftHandSideExpression must cover an AssignmentPattern.</span></span></code></pre></div><p>These definitions define:</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">({ prop </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> value } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> {}); </span><span style="color:#6A737D;">// ObjectAssignmentPattern</span></span>
+<span class="line"><span style="color:#E1E4E8;">({ prop </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> value }); </span><span style="color:#6A737D;">// ObjectLiteral with SyntaxError</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">({ prop </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> value } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> {}); </span><span style="color:#6A737D;">// ObjectAssignmentPattern</span></span>
+<span class="line"><span style="color:#24292E;">({ prop </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> value }); </span><span style="color:#6A737D;">// ObjectLiteral with SyntaxError</span></span></code></pre></div><p>Parsers need to parse <code>ObjectLiteral</code> with <code>CoverInitializedName</code>, and throw the syntax error if it does not reach <code>=</code> for <code>ObjectAssignmentPattern</code>.</p><p>As an exercise, which one of the following <code>=</code> should throw a syntax error?</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> } </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> { x </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;"> }</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> } </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> { x </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;"> }</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/learn/ecmascript/grammar.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/learn/ecmascript/spec.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>仕様</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/ja/docs/learn/performance.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>パフォーマンス</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>エコシステム</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/references.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>参考文献</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_learn_ecmascript_spec" data-v-30a5e70a><div><p><a href="https://tc39.es/ecma262/" target="_blank" rel="noreferrer">The ECMAScript® 2023 Language Specification</a> details everything about the JavaScript language, so anyone can implement their own JavaScript engine.</p><p>The following chapters need to be studied for our parser:</p><ul><li>Chapter 5: Notational Conventions</li><li>Chapter 11: ECMAScript Language: Source Text</li><li>Chapter 12: ECMAScript Language: Lexical Grammar</li><li>Chapter 13 - 16: Expressions, Statements, Functions, Classes, Scripts and Modules</li><li>Annex B: Additional ECMAScript Features for Web Browsers</li><li>Annex C: The Strict Mode of ECMAScript</li></ul><p>For navigation inside the specification:</p><ul><li>Anything clickable has a permanent link, they are shown on the URL as anchors, for example <code>#sec-identifiers</code></li><li>Hovering over things may show a tooltip, clicking on <code>References</code> shows all its references</li></ul><h2 id="notational-conventions" tabindex="-1">Notational Conventions <a class="header-anchor" href="#notational-conventions" aria-label="Permalink to &quot;Notational Conventions&quot;">​</a></h2><p><a href="https://tc39.es/ecma262/#sec-grammar-notation" target="_blank" rel="noreferrer">Chapter 5.1.5 Grammar Notation</a> is the section we need to read.</p><p>The things to note here are:</p><h3 id="recursion" tabindex="-1">Recursion <a class="header-anchor" href="#recursion" aria-label="Permalink to &quot;Recursion&quot;">​</a></h3><p>This is how lists are presented in the grammar.</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ArgumentList :</span></span>
+<span class="line"><span style="color:#e1e4e8;">  AssignmentExpression</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ArgumentList , AssignmentExpression</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ArgumentList :</span></span>
+<span class="line"><span style="color:#24292e;">  AssignmentExpression</span></span>
+<span class="line"><span style="color:#24292e;">  ArgumentList , AssignmentExpression</span></span></code></pre></div><p>means</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">a, b </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, c </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">2</span></span>
+<span class="line"><span style="color:#F97583;">^</span><span style="color:#E1E4E8;">_____________</span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;"> ArgumentList</span></span>
+<span class="line"><span style="color:#E1E4E8;">   </span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;">__________</span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;"> ArgumentList, AssignmentExpression,</span></span>
+<span class="line"><span style="color:#E1E4E8;">          </span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;">___</span><span style="color:#F97583;">^</span><span style="color:#E1E4E8;"> AssignmentExpression</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">a, b </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, c </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">2</span></span>
+<span class="line"><span style="color:#D73A49;">^</span><span style="color:#24292E;">_____________</span><span style="color:#D73A49;">^</span><span style="color:#24292E;"> ArgumentList</span></span>
+<span class="line"><span style="color:#24292E;">   </span><span style="color:#D73A49;">^</span><span style="color:#24292E;">__________</span><span style="color:#D73A49;">^</span><span style="color:#24292E;"> ArgumentList, AssignmentExpression,</span></span>
+<span class="line"><span style="color:#24292E;">          </span><span style="color:#D73A49;">^</span><span style="color:#24292E;">___</span><span style="color:#D73A49;">^</span><span style="color:#24292E;"> AssignmentExpression</span></span></code></pre></div><h3 id="optional" tabindex="-1">Optional <a class="header-anchor" href="#optional" aria-label="Permalink to &quot;Optional&quot;">​</a></h3><p>The <code>_opt_</code> suffix for optional syntax. For example,</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">VariableDeclaration :</span></span>
+<span class="line"><span style="color:#e1e4e8;">  BindingIdentifier Initializer_opt</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">VariableDeclaration :</span></span>
+<span class="line"><span style="color:#24292e;">  BindingIdentifier Initializer_opt</span></span></code></pre></div><p>means</p><div class="language-javascript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> binding_identifier;</span></span>
+<span class="line"><span style="color:#F97583;">var</span><span style="color:#E1E4E8;"> binding_identifier </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> Initializer;</span></span>
+<span class="line"><span style="color:#E1E4E8;">                       ______________ Initializer_opt</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">var</span><span style="color:#24292E;"> binding_identifier;</span></span>
+<span class="line"><span style="color:#D73A49;">var</span><span style="color:#24292E;"> binding_identifier </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> Initializer;</span></span>
+<span class="line"><span style="color:#24292E;">                       ______________ Initializer_opt</span></span></code></pre></div><h3 id="parameters" tabindex="-1">Parameters <a class="header-anchor" href="#parameters" aria-label="Permalink to &quot;Parameters&quot;">​</a></h3><p>The <code>[Return]</code> and <code>[In]</code> are parameters of the grammar.</p><p>For example</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ScriptBody :</span></span>
+<span class="line"><span style="color:#e1e4e8;">    StatementList[~Yield, ~Await, ~Return]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ScriptBody :</span></span>
+<span class="line"><span style="color:#24292e;">    StatementList[~Yield, ~Await, ~Return]</span></span></code></pre></div><p>means top-level yield, await and return are not allowed in scripts, but</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">ModuleItem :</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ImportDeclaration</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ExportDeclaration</span></span>
+<span class="line"><span style="color:#e1e4e8;">  StatementListItem[~Yield, +Await, ~Return]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">ModuleItem :</span></span>
+<span class="line"><span style="color:#24292e;">  ImportDeclaration</span></span>
+<span class="line"><span style="color:#24292e;">  ExportDeclaration</span></span>
+<span class="line"><span style="color:#24292e;">  StatementListItem[~Yield, +Await, ~Return]</span></span></code></pre></div><p>allows for top-level await.</p><h2 id="source-text" tabindex="-1">Source Text <a class="header-anchor" href="#source-text" aria-label="Permalink to &quot;Source Text&quot;">​</a></h2><p><a href="https://tc39.es/ecma262/#sec-types-of-source-code" target="_blank" rel="noreferrer">Chapter 11.2 Types of Source Code</a> tells us that there is a huge distinction between script code and module code. And there is a <code>use strict</code> mode that makes the grammar saner by disallowing old JavaScript behaviors.</p><p><strong>Script Code</strong> is not strict, <code>use strict</code> need to be inserted at the top of the file to make script code strict. In html we write <code>&lt;script src=&quot;javascript.js&quot;&gt;&lt;/script&gt;</code>.</p><p><strong>Module Code</strong> is automatically strict. In html we write <code>&lt;script type=&quot;module&quot; src=&quot;main.mjs&quot;&gt;&lt;/script&gt;</code>.</p><h2 id="ecmascript-language-lexical-grammar" tabindex="-1">ECMAScript Language: Lexical Grammar <a class="header-anchor" href="#ecmascript-language-lexical-grammar" aria-label="Permalink to &quot;ECMAScript Language: Lexical Grammar&quot;">​</a></h2><p>For more in-depth explanation, read the V8 blog on <a href="https://v8.dev/blog/understanding-ecmascript-part-3" target="_blank" rel="noreferrer">Understanding the ECMAScript spec</a>.</p><h3 id="automatic-semicolon-insertion" tabindex="-1"><a href="https://tc39.es/ecma262/#sec-automatic-semicolon-insertion" target="_blank" rel="noreferrer">Automatic Semicolon Insertion</a> <a class="header-anchor" href="#automatic-semicolon-insertion" aria-label="Permalink to &quot;[Automatic Semicolon Insertion](https://tc39.es/ecma262/#sec-automatic-semicolon-insertion)&quot;">​</a></h3><p>This section describes all the rules where we can omit a semicolon while writing JavaScript. All the explanation boils down to</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">asi</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Result</span><span style="color:#E1E4E8;">&lt;()&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">eat</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">Kind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">Semicolon</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">can_insert_semicolon</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">            </span><span style="color:#F97583;">return</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Ok</span><span style="color:#E1E4E8;">(());</span></span>
+<span class="line"><span style="color:#E1E4E8;">        }</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> range </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">prev_node_end</span><span style="color:#F97583;">..</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">cur_token</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">start;</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">Err</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">SyntaxError</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">AutoSemicolonInsertion</span><span style="color:#E1E4E8;">(range</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">into</span><span style="color:#E1E4E8;">()))</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">const</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">can_insert_semicolon</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">bool</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">cur_token</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">is_on_new_line </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">matches!</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">cur_kind</span><span style="color:#E1E4E8;">(), </span><span style="color:#B392F0;">Kind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">RCurly</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">|</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Kind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">Eof</span><span style="color:#E1E4E8;">)</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">asi</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Result</span><span style="color:#24292E;">&lt;()&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">eat</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">Kind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">Semicolon</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">can_insert_semicolon</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">            </span><span style="color:#D73A49;">return</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Ok</span><span style="color:#24292E;">(());</span></span>
+<span class="line"><span style="color:#24292E;">        }</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> range </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">prev_node_end</span><span style="color:#D73A49;">..</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">cur_token</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">start;</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Err</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">SyntaxError</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">AutoSemicolonInsertion</span><span style="color:#24292E;">(range</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">into</span><span style="color:#24292E;">()))</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">const</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">can_insert_semicolon</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#005CC5;">self</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">bool</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">cur_token</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">is_on_new_line </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">matches!</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">cur_kind</span><span style="color:#24292E;">(), </span><span style="color:#6F42C1;">Kind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">RCurly</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">|</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Kind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">Eof</span><span style="color:#24292E;">)</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span></code></pre></div><p>The <code>asi</code> function need to be manually called where applicable, for example in the end of statement:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">parse_debugger_statement</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Result</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> node </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">start_node</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">expect</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">Kind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">Debugger</span><span style="color:#E1E4E8;">)</span><span style="color:#F97583;">?</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#6A737D;">        // highlight-next-line</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">asi</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">?</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">ast</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">debugger_statement</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">finish_node</span><span style="color:#E1E4E8;">(node))</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">parse_debugger_statement</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Result</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> node </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">start_node</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">expect</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">Kind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">Debugger</span><span style="color:#24292E;">)</span><span style="color:#D73A49;">?</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#6A737D;">        // highlight-next-line</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">asi</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">?</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">ast</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">debugger_statement</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">finish_node</span><span style="color:#24292E;">(node))</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span></code></pre></div><div class="info custom-block"><p class="custom-block-title">INFO</p><p>This section on asi is written with a parser in mind, it explicitly states that the source text is parsed from left to right, which makes it almost impossible to write the parser in any other way. The author of jsparagus made a rant about this <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md#automatic-semicolon-insertion-" target="_blank" rel="noreferrer">here</a>.</p><blockquote><p>The specification for this feature is both very-high-level and weirdly procedural (“When, as the source text is parsed from left to right, a token is encountered...”, as if the specification is telling a story about a browser. As far as I know, this is the only place in the spec where anything is assumed or implied about the internal implementation details of parsing.) But it would be hard to specify ASI any other way.</p></blockquote></div><h2 id="expressions-statements-functions-classes-scripts-and-modules" tabindex="-1">Expressions, Statements, Functions, Classes, Scripts and Modules <a class="header-anchor" href="#expressions-statements-functions-classes-scripts-and-modules" aria-label="Permalink to &quot;Expressions, Statements, Functions, Classes, Scripts and Modules&quot;">​</a></h2><p>It takes a while to understand the syntactic grammar, then apply them to writing a parser.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/learn/ecmascript/spec.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/learn/architecture/minifier.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>Modifier</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/ja/docs/learn/ecmascript/grammar.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>文法</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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It would be a great pleasure if you could join as well.</p><p>We are being integrated into:</p><h2 id="rspack" tabindex="-1"><a href="https://www.rspack.dev" target="_blank" rel="noreferrer">Rspack</a> <a class="header-anchor" href="#rspack" aria-label="Permalink to &quot;[Rspack](https://www.rspack.dev)&quot;">​</a></h2><p>A fast Rust-based web bundler.</p><h2 id="rolldown" tabindex="-1">Rolldown <a class="header-anchor" href="#rolldown" aria-label="Permalink to &quot;Rolldown&quot;">​</a></h2><p>To be announced.</p><h2 id="ezno-type-checker" tabindex="-1"><a href="https://github.com/kaleidawave/ezno" target="_blank" rel="noreferrer">Ezno Type Checker</a> <a class="header-anchor" href="#ezno-type-checker" aria-label="Permalink to &quot;[Ezno Type Checker](https://github.com/kaleidawave/ezno)&quot;">​</a></h2><p>A JavaScript compiler and TypeScript checker written in Rust with a focus on static analysis and runtime performance.</p><h2 id="tyvm" tabindex="-1"><a href="https://github.com/zackradisic/tyvm" target="_blank" rel="noreferrer">Tyvm</a> <a class="header-anchor" href="#tyvm" aria-label="Permalink to &quot;[Tyvm](https://github.com/zackradisic/tyvm)&quot;">​</a></h2><p>An experimental bytecode interpreter for type-level Typescript.</p></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/learn/ecosystem.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/learn/performance.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>パフォーマンス</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/ja/docs/learn/references.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>参考文献</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>エコシステム</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-1a4376dd data-v-1a4376dd><div class="item" data-v-1a4376dd><div class="indicator" data-v-1a4376dd></div><a class="VPLink link link" href="/ja/docs/learn/references.html" data-v-1a4376dd><!--[--><p class="text" data-v-1a4376dd>参考文献</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-8574ffd1 data-v-a5670ab7><div class="VPDoc has-sidebar has-aside" data-v-a5670ab7 data-v-30a5e70a><!--[--><!--]--><div class="container" data-v-30a5e70a><div class="aside" data-v-30a5e70a><div class="aside-curtain" data-v-30a5e70a></div><div class="aside-container" data-v-30a5e70a><div class="aside-content" data-v-30a5e70a><div class="VPDocAside" data-v-30a5e70a data-v-4ccc7a73><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-4ccc7a73 data-v-82d1df03><div class="content" data-v-82d1df03><div class="outline-marker" data-v-82d1df03></div><div class="outline-title" role="heading" aria-level="2" data-v-82d1df03>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-82d1df03><span class="visually-hidden" id="doc-outline-aria-label" data-v-82d1df03> Table of Contents for current page </span><ul class="root" data-v-82d1df03 data-v-266a89cb><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-4ccc7a73></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-30a5e70a><div class="content-container" data-v-30a5e70a><!--[--><!--]--><!----><main class="main" data-v-30a5e70a><div style="position:relative;" class="vp-doc _ja_docs_learn_performance" data-v-30a5e70a><div><h1 id="pursuit-of-performance-on-building-a-javascript-compiler" tabindex="-1">Pursuit of Performance on Building a JavaScript Compiler <a class="header-anchor" href="#pursuit-of-performance-on-building-a-javascript-compiler" aria-label="Permalink to &quot;Pursuit of Performance on Building a JavaScript Compiler&quot;">​</a></h1><p>Originally posted on <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">https://rustmagazine.org/issue-3/javascript-compiler/</a></p><h2 id="on-performance" tabindex="-1">On Performance <a class="header-anchor" href="#on-performance" aria-label="Permalink to &quot;On Performance&quot;">​</a></h2><p>After two years of writing Rust, performance has become an ingrained discipline for me - it boils down to <strong>allocate less memory</strong> and <strong>use fewer CPU cycles</strong>.</p><p>However, achieving optimal performance can be difficult without the knowledge of the problem domain or awareness of potential solutions.</p><p>I will take you on my journey of performance and optimization in the following sections. My preferred method of learning is through a combination of research, trial, and error, so the following sections will be organized as such.</p><h1 id="parsing" tabindex="-1">Parsing <a class="header-anchor" href="#parsing" aria-label="Permalink to &quot;Parsing&quot;">​</a></h1><p>Oxc is a standard compiler that includes an abstract syntax tree (AST), a lexer, and a recursive descent parser.</p><h2 id="abstract-syntax-tree-ast" tabindex="-1">Abstract Syntax Tree (AST) <a class="header-anchor" href="#abstract-syntax-tree-ast" aria-label="Permalink to &quot;Abstract Syntax Tree (AST)&quot;">​</a></h2><p>The first architectural design for a compiler is its AST.</p><p>All JavaScript tools work on the AST level, for example:</p><ul><li>A linter (e.g. ESLint) checks the AST for errors</li><li>A formatter (e.g.prettier) prints the AST back to JavaScript text</li><li>A minifier (e.g. terser) transforms the AST</li><li>A bundler connects all import and export statements between ASTs from different files</li></ul><p>It will be painful to build these tools if the AST is not user-friendly.</p><p>For JavaScript, the most used AST specification is <a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a>. My first AST version replicates estree:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Program</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> body</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">VariableDeclarationStatement</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">VariableDeclaration</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">VariableDeclaration</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> declarations</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">VariableDeclarator</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Program</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> body</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">VariableDeclarationStatement</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">VariableDeclaration</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">VariableDeclaration</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> declarations</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">VariableDeclarator</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>In Rust, declaring a tree is relatively straightforward, as it involves using structs and enums.</p><h3 id="memory-allocation" tabindex="-1">Memory Allocation <a class="header-anchor" href="#memory-allocation" aria-label="Permalink to &quot;Memory Allocation&quot;">​</a></h3><p>I worked on this version of AST for a couple of months while writing the parser. And one day I decided to profile it. The profiler showed the program was spending a lot of time calling <code>drop</code>.</p><p>💡 Nodes of the AST are allocated on the heap via <code>Box</code> or <code>Vec</code>, they are allocated individually so they are dropped in sequential order.</p><p>Is there a solution to mitigate this?</p><p>So while working on the parser I studied some of the other JavaScript parsers written in Rust, mainly <a href="https://github.com/ratel-rust/ratel-core" target="_blank" rel="noreferrer">ratel</a> and <a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a>.</p><p>Both of these parsers declare their AST with a lifetime annotation,</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">ast</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Expression</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">ExpressionNode</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">ast</span><span style="color:#E1E4E8;">&gt;),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">ast</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Expression</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">ExpressionNode</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">ast</span><span style="color:#24292E;">&gt;),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>and they have an accompanying file called <code>arena.rs</code>.</p><p>I did not understand what it does so I neglected them until I started reading about their usage of memory arenas: <a href="https://docs.rs/bumpalo/latest/bumpalo/" target="_blank" rel="noreferrer">bumpalo</a> and <a href="https://docs.rs/toolshed/latest/toolshed/struct.Arena.html" target="_blank" rel="noreferrer">toolshed</a>.</p><p>In summary, memory arena allocates memory upfront in chunks or pages and deallocate altogether when the arena is dropped. The AST is allocated on the arena so dropping the AST is a fast operation.</p><p>Another nice side effect that comes with this is that, the AST is constructed in a specific order, and tree traversal also follows the same order, resulting in linear memory access during the visitation process. This access pattern will be efficient since all nearby memory will be read into the CPU cache in pages, resulting in faster access times.</p><p>Unfortunately it can be challenging for Rust beginners to use memory arenas because all data structures and relevant functions need to be parameterized by lifetime annotations. It took me five attempts to allocate the AST inside <code>bumpalo</code>.</p><p>Changing to a memory arena for the AST resulted around 20% performance improvement.</p><h3 id="enum-sizes" tabindex="-1">Enum Sizes <a class="header-anchor" href="#enum-sizes" aria-label="Permalink to &quot;Enum Sizes&quot;">​</a></h3><p>Due to the recursive nature of ASTs, we need to define the types in a way to avoid the &quot;recursive without indirection&quot; error:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">error[E0072]: recursive types `Enum` and `Variant` have infinite size</span></span>
+<span class="line"><span style="color:#e1e4e8;"> --&gt; crates/oxc_linter/src/lib.rs:1:1</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |</span></span>
+<span class="line"><span style="color:#e1e4e8;">1 | enum Enum {</span></span>
+<span class="line"><span style="color:#e1e4e8;">  | ^^^^^^^^^</span></span>
+<span class="line"><span style="color:#e1e4e8;">2 |     Variant(Variant),</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |             ------- recursive without indirection</span></span>
+<span class="line"><span style="color:#e1e4e8;">3 | }</span></span>
+<span class="line"><span style="color:#e1e4e8;">4 | struct Variant {</span></span>
+<span class="line"><span style="color:#e1e4e8;">  | ^^^^^^^^^^^^^^</span></span>
+<span class="line"><span style="color:#e1e4e8;">5 |     field: Enum,</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |            ---- recursive without indirection</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |</span></span>
+<span class="line"><span style="color:#e1e4e8;">help: insert some indirection (e.g., a `Box`, `Rc`, or `&amp;`) to break the cycle</span></span>
+<span class="line"><span style="color:#e1e4e8;">  |</span></span>
+<span class="line"><span style="color:#e1e4e8;">2 ~     Variant(Box&lt;Variant&gt;),</span></span>
+<span class="line"><span style="color:#e1e4e8;">3 | }</span></span>
+<span class="line"><span style="color:#e1e4e8;">4 | struct Variant {</span></span>
+<span class="line"><span style="color:#e1e4e8;">5 ~     field: Box&lt;Enum&gt;,</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">error[E0072]: recursive types `Enum` and `Variant` have infinite size</span></span>
+<span class="line"><span style="color:#24292e;"> --&gt; crates/oxc_linter/src/lib.rs:1:1</span></span>
+<span class="line"><span style="color:#24292e;">  |</span></span>
+<span class="line"><span style="color:#24292e;">1 | enum Enum {</span></span>
+<span class="line"><span style="color:#24292e;">  | ^^^^^^^^^</span></span>
+<span class="line"><span style="color:#24292e;">2 |     Variant(Variant),</span></span>
+<span class="line"><span style="color:#24292e;">  |             ------- recursive without indirection</span></span>
+<span class="line"><span style="color:#24292e;">3 | }</span></span>
+<span class="line"><span style="color:#24292e;">4 | struct Variant {</span></span>
+<span class="line"><span style="color:#24292e;">  | ^^^^^^^^^^^^^^</span></span>
+<span class="line"><span style="color:#24292e;">5 |     field: Enum,</span></span>
+<span class="line"><span style="color:#24292e;">  |            ---- recursive without indirection</span></span>
+<span class="line"><span style="color:#24292e;">  |</span></span>
+<span class="line"><span style="color:#24292e;">help: insert some indirection (e.g., a `Box`, `Rc`, or `&amp;`) to break the cycle</span></span>
+<span class="line"><span style="color:#24292e;">  |</span></span>
+<span class="line"><span style="color:#24292e;">2 ~     Variant(Box&lt;Variant&gt;),</span></span>
+<span class="line"><span style="color:#24292e;">3 | }</span></span>
+<span class="line"><span style="color:#24292e;">4 | struct Variant {</span></span>
+<span class="line"><span style="color:#24292e;">5 ~     field: Box&lt;Enum&gt;,</span></span></code></pre></div><p>There are two ways to do this. Either box the enum in the enum variant or box the struct field.</p><p>I found the same question in the Rust forum back in 2017, <a href="https://users.rust-lang.org/t/is-there-a-better-way-to-represent-an-abstract-syntax-tree/9549/4" target="_blank" rel="noreferrer">Is there a better way to represent an abstract syntax tree?</a></p><p>Aleksey (matklad) told us to box the enum variants to keep the <code>Expression</code> enum small. But what does this mean?</p><p>As it turns out, the memory layout of a Rust enum is dependent on the sizes of all its variants, its total byte size dependents on the largest variant. For example, the following enum will take up 56 bytes (1 byte for the tag, 48 bytes for the payload, and 8 bytes for alignment).</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Enum</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">A</span><span style="color:#E1E4E8;">,</span><span style="color:#6A737D;"> // 0 byte payload</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">B</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">),</span><span style="color:#6A737D;"> // 24 byte payload</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">C</span><span style="color:#E1E4E8;"> { first</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">, last</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;"> },</span><span style="color:#6A737D;"> // 48 byte payload</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Enum</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">A</span><span style="color:#24292E;">,</span><span style="color:#6A737D;"> // 0 byte payload</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">B</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">),</span><span style="color:#6A737D;"> // 24 byte payload</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">C</span><span style="color:#24292E;"> { first</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">, last</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;"> },</span><span style="color:#6A737D;"> // 48 byte payload</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>In a typical JavaScript AST, the <code>Expression</code> enum holds 45 variants and the <code>Statement</code> enum holds 20 variants. They take up more than 200 bytes if not boxed by enum variants. These 200 bytes have to be passed around, and also accessed every time we do a <code>matches!(expr, Expression::Variant(_))</code> check, which is not very cache friendly for performance.</p><p>So to make memory access efficient, it is best to box the enum variants.</p><p>The <a href="https://nnethercote.github.io/perf-book/type-sizes.html" target="_blank" rel="noreferrer">perf-book</a> describes additional info on how to find large types.</p><p>I also copied the test for restricting small enum sizes.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">#[cfg(all(target_arch </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;x86_64&quot;</span><span style="color:#E1E4E8;">, target_pointer_width </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;64&quot;</span><span style="color:#E1E4E8;">))]</span></span>
+<span class="line"><span style="color:#E1E4E8;">#[test]</span></span>
+<span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">no_bloat_enum_sizes</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">mem</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">size_of;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">crate::</span><span style="color:#B392F0;">ast</span><span style="color:#F97583;">::*</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">assert_eq!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Statement</span><span style="color:#E1E4E8;">&gt;(), </span><span style="color:#79B8FF;">16</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">assert_eq!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Expression</span><span style="color:#E1E4E8;">&gt;(), </span><span style="color:#79B8FF;">16</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">assert_eq!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Declaration</span><span style="color:#E1E4E8;">&gt;(), </span><span style="color:#79B8FF;">16</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">#[cfg(all(target_arch </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;x86_64&quot;</span><span style="color:#24292E;">, target_pointer_width </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;64&quot;</span><span style="color:#24292E;">))]</span></span>
+<span class="line"><span style="color:#24292E;">#[test]</span></span>
+<span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">no_bloat_enum_sizes</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">mem</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">size_of;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">crate::</span><span style="color:#6F42C1;">ast</span><span style="color:#D73A49;">::*</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">assert_eq!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Statement</span><span style="color:#24292E;">&gt;(), </span><span style="color:#005CC5;">16</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">assert_eq!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Expression</span><span style="color:#24292E;">&gt;(), </span><span style="color:#005CC5;">16</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">assert_eq!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Declaration</span><span style="color:#24292E;">&gt;(), </span><span style="color:#005CC5;">16</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>Boxing the enum variants resulted around 10% speed-up.</p><h3 id="span" tabindex="-1">Span <a class="header-anchor" href="#span" aria-label="Permalink to &quot;Span&quot;">​</a></h3><p>Occasionally, we may not realize that a smaller memory footprint is possible until we spend some extra time examining the data structures.</p><p>In this instance, the leaf of all AST nodes contains a small data structure called the &quot;span&quot;, which is used for storing the byte offset from the source text and comprises two <code>usize</code>s.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> start</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> end</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> start</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> end</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>It was <a href="https://github.com/Boshen/oxc/pull/4#pullrequestreview-1294538874" target="_blank" rel="noreferrer">pointed out to me</a> that I can safely change <code>usize</code> to <code>u32</code> to reduce peak memory because larger than <code>u32</code> is a 4GB file.</p><p>Changing to <code>u32</code> improved the performance <a href="https://github.com/Boshen/oxc/pull/31" target="_blank" rel="noreferrer">up to 5% performance on large files</a>.</p><h3 id="strings-and-identifiers" tabindex="-1">Strings and Identifiers <a class="header-anchor" href="#strings-and-identifiers" aria-label="Permalink to &quot;Strings and Identifiers&quot;">​</a></h3><p>Inside the AST, one may attempt to use a string reference to the source text for identifier names and string literals.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">StringLiteral</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> value</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Identifier</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> name</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">StringLiteral</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> value</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Identifier</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> name</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>But unfortunately in JavaScript, strings and identifiers can have <a href="https://mathiasbynens.be/notes/javascript-escapes" target="_blank" rel="noreferrer">escape sequences</a>, i.e. <code>&#39;\251&#39;</code>, <code>&#39;\xA9&#39;</code> and <code>&#39;©&#39;</code> are the same for the copyright symbol.</p><p>This implies that we must compute the escaped values and allocate a new <code>String</code>.</p><h3 id="string-interning" tabindex="-1">String interning <a class="header-anchor" href="#string-interning" aria-label="Permalink to &quot;String interning&quot;">​</a></h3><p>When there are lots of heap-allocated strings, a technique called <a href="https://en.wikipedia.org/wiki/String_interning" target="_blank" rel="noreferrer">string interning</a> can be used to reduce total memory by storing only one copy of each distinct string value.</p><p><a href="https://crates.io/crates/string_cache" target="_blank" rel="noreferrer">string-cache</a> is a popular and widely used library published by the servo team. Initially, I used the <code>string-cache</code> library for identifiers and strings in the AST. The performance of the parser was fast in a single thread, but when I started implementing the linter where there are multiples parser running parallel with rayon, CPU utilization was at about 50% of all cores.</p><p>Upon profiling, a method called <code>parking_lot::raw_mutex::RawMutex::lock_slow</code> showed up on the top of the execution time. I did not know much about locks and multi-core programming, but a global lock was just strange to start with, so I decided to remove the <code>string-cache</code> library to enable full CPU utilization.</p><p>Removing <code>string-cache</code> from the AST improved the performance of parallel parsing by about 30%.</p><h4 id="string-cache" tabindex="-1">string-cache <a class="header-anchor" href="#string-cache" aria-label="Permalink to &quot;string-cache&quot;">​</a></h4><p>Half a year later, while working on another performance-critical project, the <code>string-cache</code> library resurfaced again. It was blocking all the threads during parallel text parsing.</p><p>I decided to study what <code>string-cache</code> does because I am prepared this time after reading the book <a href="https://marabos.nl/atomics/" target="_blank" rel="noreferrer">Rust Atomics and Locks</a> by Mara Bos.</p><p>Here are the <a href="https://github.com/servo/string-cache/blob/6c044c91bb3d8212dae931152a7895f498574f71/src/dynamic_set.rs#L41-L42" target="_blank" rel="noreferrer">relevant</a><a href="https://github.com/servo/string-cache/blob/6c044c91bb3d8212dae931152a7895f498574f71/src/atom.rs#L204" target="_blank" rel="noreferrer">code</a> around the lock. Please note that the code was written eight years ago in 2015.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">crate</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">static</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">DYNAMIC_SET</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Lazy</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Mutex</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Set</span><span style="color:#E1E4E8;">&gt;&gt; </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Lazy</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Mutex</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">({</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6A737D;">// ... in another place</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> ptr</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">ptr</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">NonNull</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;">&gt; </span><span style="color:#F97583;">=</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#79B8FF;">DYNAMIC_SET</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">lock</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">insert</span><span style="color:#E1E4E8;">(string_to_add, hash</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">g);</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">crate</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">static</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">DYNAMIC_SET</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Lazy</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Mutex</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Set</span><span style="color:#24292E;">&gt;&gt; </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Lazy</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Mutex</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">({</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#6A737D;">// ... in another place</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> ptr</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">ptr</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">NonNull</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;">&gt; </span><span style="color:#D73A49;">=</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#005CC5;">DYNAMIC_SET</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">lock</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">insert</span><span style="color:#24292E;">(string_to_add, hash</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">g);</span></span></code></pre></div><p>So this is straightforward. It locks the data structure <code>Set</code> every time a string is being inserted. As this routine is called frequently within a parser, its performance is impacted negatively by synchronization.</p><p>Now let&#39;s take a look at the <a href="https://github.com/servo/string-cache/blob/6c044c91bb3d8212dae931152a7895f498574f71/src/dynamic_set.rs#L53-L86" target="_blank" rel="noreferrer"><code>Set</code> data structure</a> and see what it does:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">crate</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">insert</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, string</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Cow</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">&gt;, hash</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">u32</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">NonNull</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> bucket_index </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> (hash </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">BUCKET_MASK</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">as</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">mut</span><span style="color:#E1E4E8;"> ptr</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Option</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Box</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;">&gt;&gt; </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">buckets[bucket_index]</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">as_mut</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">while</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Some</span><span style="color:#E1E4E8;">(entry) </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> ptr</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">take</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">            </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">hash </span><span style="color:#F97583;">==</span><span style="color:#E1E4E8;"> hash </span><span style="color:#F97583;">&amp;&amp;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">*</span><span style="color:#E1E4E8;">entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">string </span><span style="color:#F97583;">==</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">*</span><span style="color:#E1E4E8;">string {</span></span>
+<span class="line"><span style="color:#E1E4E8;">                </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">ref_count</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">fetch_add</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">SeqCst</span><span style="color:#E1E4E8;">) &gt; </span><span style="color:#79B8FF;">0</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">                    </span><span style="color:#F97583;">return</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">NonNull</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">from</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">**</span><span style="color:#E1E4E8;">entry);</span></span>
+<span class="line"><span style="color:#E1E4E8;">                }</span></span>
+<span class="line"><span style="color:#E1E4E8;">                entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">ref_count</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">fetch_sub</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">SeqCst</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">                </span><span style="color:#F97583;">break</span><span style="color:#E1E4E8;">;</span></span>
+<span class="line"><span style="color:#E1E4E8;">            }</span></span>
+<span class="line"><span style="color:#E1E4E8;">            ptr </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> entry</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">next_in_bucket</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">as_mut</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">        }</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">debug_assert!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">mem</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">align_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;">&gt;() </span><span style="color:#F97583;">&gt;=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">ENTRY_ALIGNMENT</span><span style="color:#E1E4E8;">);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> string </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> string</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">into_owned</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">mut</span><span style="color:#E1E4E8;"> entry </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Box</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">Entry</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        next_in_bucket</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">buckets[bucket_index]</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">take</span><span style="color:#E1E4E8;">(),</span></span>
+<span class="line"><span style="color:#E1E4E8;">        hash,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        ref_count</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AtomicIsize</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">        string</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> string</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">into_boxed_str</span><span style="color:#E1E4E8;">(),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    });</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> ptr </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">NonNull</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">from</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">*</span><span style="color:#E1E4E8;">entry);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">buckets[bucket_index] </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Some</span><span style="color:#E1E4E8;">(entry);</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    ptr</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">crate</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">insert</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, string</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Cow</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">&gt;, hash</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">u32</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">NonNull</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> bucket_index </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> (hash </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">BUCKET_MASK</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">as</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">    {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">mut</span><span style="color:#24292E;"> ptr</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Option</span><span style="color:#24292E;">&lt;</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Box</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;">&gt;&gt; </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">buckets[bucket_index]</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">as_mut</span><span style="color:#24292E;">();</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">while</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Some</span><span style="color:#24292E;">(entry) </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> ptr</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">take</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">            </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">hash </span><span style="color:#D73A49;">==</span><span style="color:#24292E;"> hash </span><span style="color:#D73A49;">&amp;&amp;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">*</span><span style="color:#24292E;">entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">string </span><span style="color:#D73A49;">==</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">*</span><span style="color:#24292E;">string {</span></span>
+<span class="line"><span style="color:#24292E;">                </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">ref_count</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">fetch_add</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">SeqCst</span><span style="color:#24292E;">) &gt; </span><span style="color:#005CC5;">0</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">                    </span><span style="color:#D73A49;">return</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">NonNull</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">from</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">**</span><span style="color:#24292E;">entry);</span></span>
+<span class="line"><span style="color:#24292E;">                }</span></span>
+<span class="line"><span style="color:#24292E;">                entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">ref_count</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">fetch_sub</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">SeqCst</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">                </span><span style="color:#D73A49;">break</span><span style="color:#24292E;">;</span></span>
+<span class="line"><span style="color:#24292E;">            }</span></span>
+<span class="line"><span style="color:#24292E;">            ptr </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> entry</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">next_in_bucket</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">as_mut</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">        }</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">debug_assert!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">mem</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">align_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;">&gt;() </span><span style="color:#D73A49;">&gt;=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">ENTRY_ALIGNMENT</span><span style="color:#24292E;">);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> string </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> string</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">into_owned</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">mut</span><span style="color:#24292E;"> entry </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Box</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">Entry</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">        next_in_bucket</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">buckets[bucket_index]</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">take</span><span style="color:#24292E;">(),</span></span>
+<span class="line"><span style="color:#24292E;">        hash,</span></span>
+<span class="line"><span style="color:#24292E;">        ref_count</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AtomicIsize</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">        string</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> string</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">into_boxed_str</span><span style="color:#24292E;">(),</span></span>
+<span class="line"><span style="color:#24292E;">    });</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> ptr </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">NonNull</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">from</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">*</span><span style="color:#24292E;">entry);</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">buckets[bucket_index] </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Some</span><span style="color:#24292E;">(entry);</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    ptr</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>It looks like it is looking for a bucket to store the string and it inserts the string if it is not in the bucket.</p><p>💡 Is this linear probing? If this is linear probing then this <code>Set</code> is just a <code>HashMap</code> without saying it is a <code>HashMap</code>. 💡 If this is a <code>HashMap</code>, then <code>Mutex&lt;HashMap&gt;</code> is a concurrent hashmap.</p><p>Although the solution may seem straightforward when we know what to look for, it took me a month to figure this out because I was unaware of the issue. When it became evident that this is just a concurrent hashmap, applying the Mutex to the buckets instead of the entire hashmap was a clear and logical solution. Within an hour of implementing this change, I submitted a pull request and was happy with the outcome 😃.</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">https://github.com/servo/string-cache/pull/268</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">https://github.com/servo/string-cache/pull/268</span></span></code></pre></div><p>It is worth mentioning that string interning is a battlefield within the Rust community. For the example shown in <a href="https://dev.to/cad97/string-interners-in-rust-797" target="_blank" rel="noreferrer">this blog post</a>, there are single-threaded libraries such <code>string-interner</code>, <code>lasso</code>, <code>lalrpop-intern</code>, <code>intaglio</code> and <code>strena</code>.</p><p>Since we are parsing files in parallel, an option is to utilize a multi-threaded string interner library such as <a href="https://crates.io/crates/ustr" target="_blank" rel="noreferrer"><code>ustr</code></a>. However, after profiling both <code>ustr</code> and the enhanced version of <code>string-cache</code>, it became apparent that the performance was still below expectations compared to the approach I am going to explain below.</p><p>Some preliminary guesses for the sub-par performance are:</p><ul><li>Hashing - the interners need to hash the string for deduplication</li><li>Indirection - we need to read the string value from a &quot;far away&quot; heap, which is not cache friendly</li></ul><h3 id="string-inlining" tabindex="-1">String Inlining <a class="header-anchor" href="#string-inlining" aria-label="Permalink to &quot;String Inlining&quot;">​</a></h3><p>So we are back to the initial problem of having to allocate lots of strings. Fortunately, there is a partial solution to this problem if we look at what kind of data we are dealing with: short JavaScript variable names and some short strings. There is a technique called string inlining, where we store all of the bytes of a string on the stack.</p><p>In essence, we want the following enum to store our string.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Str</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Static</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">static</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Inline</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">InlineReprensation</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Heap</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Str</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Static</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">static</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Inline</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">InlineReprensation</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Heap</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>To minimize the size of the enum, <code>InlineRepresentation</code> should have the same size as <code>String</code>.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">#[cfg(all(target_arch </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;x86_64&quot;</span><span style="color:#E1E4E8;">, target_pointer_width </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&quot;64&quot;</span><span style="color:#E1E4E8;">))]</span></span>
+<span class="line"><span style="color:#E1E4E8;">#[test]</span></span>
+<span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">test_size</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">mem</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">size_of;</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">assert_eq!</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">&gt;(), </span><span style="color:#B392F0;">size_of</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">InlineReprensation</span><span style="color:#E1E4E8;">&gt;());</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">#[cfg(all(target_arch </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;x86_64&quot;</span><span style="color:#24292E;">, target_pointer_width </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&quot;64&quot;</span><span style="color:#24292E;">))]</span></span>
+<span class="line"><span style="color:#24292E;">#[test]</span></span>
+<span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">test_size</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">mem</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">size_of;</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">assert_eq!</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">&gt;(), </span><span style="color:#6F42C1;">size_of</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">InlineReprensation</span><span style="color:#24292E;">&gt;());</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>Many crates in the Rust community aim to optimize memory usage. This is yet another battlefield within the community. The most popular ones are</p><ul><li><a href="https://crates.io/crates/smol_str" target="_blank" rel="noreferrer">smol_str</a></li><li><a href="https://crates.io/crates/smartstring" target="_blank" rel="noreferrer">smartstring</a></li><li><a href="https://crates.io/crates/compact_str" target="_blank" rel="noreferrer">compact_str</a></li><li><a href="https://crates.io/crates/flexstr" target="_blank" rel="noreferrer">flexstr</a></li></ul><p>Each of these crates have unique characteristics and approaches to achieving memory optimization, leading to a variety of trade-offs and considerations when choosing which one to use. For example <code>smol_str</code> and <code>flexstr</code> clones are O(1). <code>flexstr</code> can store 22 bytes, <code>smol_str</code> and <code>smartstring</code> can store 23 bytes, and <code>compact_str</code> can store 24 bytes on 64-bit systems.</p><p><a href="https://fasterthanli.me" target="_blank" rel="noreferrer">https://fasterthanli.me</a> has a <a href="https://fasterthanli.me/articles/small-strings-in-rust" target="_blank" rel="noreferrer">deep dive</a> on this topic.</p><p>Changing <code>String</code> to <code>compact_str::CompactStr</code> reduced memory allocations by a large amount.</p><h2 id="lexer" tabindex="-1">Lexer <a class="header-anchor" href="#lexer" aria-label="Permalink to &quot;Lexer&quot;">​</a></h2><h3 id="token" tabindex="-1">Token <a class="header-anchor" href="#token" aria-label="Permalink to &quot;Token&quot;">​</a></h3><p>The job of the lexer (also known as tokenizer) is to turn source text into structured data called a token.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Token</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Kind</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Token</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Kind</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>To make it easier to work with, a token kind is typically defined as an enum in Rust. The variants of the enums hold the corresponding data for each token.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Kind</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">    // Keywords</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">For</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">While</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">...</span></span>
+<span class="line"><span style="color:#6A737D;">    // Literals</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Num</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">f64</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">...</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Kind</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">    // Keywords</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">For</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">While</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">...</span></span>
+<span class="line"><span style="color:#6A737D;">    // Literals</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Num</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">f64</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">...</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>This enum currently uses 32 bytes, and a lexer often need to construct millions of this token <code>Kind</code>. Every time it constructs a <code>Kind::For</code> or <code>Kind::While</code>, it has to allocate 32 bytes of memory on the stack.</p><p>A clever way to improve this is to break up the enum variant to keep <code>Kind</code> to a single byte and move the values into another enum,</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Token</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Kind</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> value</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">TokenValue</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">TokenValue</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">None</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Num</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">f64</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Token</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Kind</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> value</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">TokenValue</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">TokenValue</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">None</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Num</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">f64</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>Since we control all the parsing code, it is our job to keep this safe by always declaring the corresponding token value to its kind.</p><p>While a <code>TokenValue</code> of 32 bytes is already quite small, it may still have a negative impact on performance because it is allocated frequently.</p><p>Let&#39;s take a look at the <code>String</code> type and see what we can find, by using the &quot;go-to definition&quot; in our code editors, we&#39;ll go through <code>String</code> -&gt; <code>Vec</code> -&gt; <code>RawVec</code>:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    vec</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">u8</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    buf</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">RawVec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">T</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">A</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    len</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">RawVec</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    ptr</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Unique</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">T</span><span style="color:#E1E4E8;">&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    cap</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    alloc</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">A</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    vec</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">u8</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    buf</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">RawVec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">T</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">A</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">    len</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">RawVec</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    ptr</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Unique</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">T</span><span style="color:#24292E;">&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">    cap</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    alloc</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">A</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>As advertised, a <code>String</code> is just a <code>Vec</code> of <code>u8</code>s, and a <code>Vec</code> has a length and a capacity field. Since we are never going to mutate this string, an optimization in terms of memory usage would be to drop the cap field and use a string slice (<code>&amp;str</code>) instead.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">TokenValue</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">None</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">String</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Num</span><span style="color:#E1E4E8;">(</span><span style="color:#B392F0;">f64</span><span style="color:#E1E4E8;">),</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">TokenValue</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">None</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">String</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Num</span><span style="color:#24292E;">(</span><span style="color:#6F42C1;">f64</span><span style="color:#24292E;">),</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p><code>TokenValue</code> becomes 24 bytes.</p><p>While using a string slice instead of String in <code>TokenValue</code> would reduce memory usage, it does come with the downside of adding a lifetime annotation. This can lead to issues with the borrow checker and the lifetime annotation will propagate to the rest of the codebase, making our code somewhat difficult to manage. I lost the borrow checking game 8 months ago but <a href="https://github.com/Boshen/oxc/pull/174" target="_blank" rel="noreferrer">finally won</a> when I revisited this.</p><p>When it makes sense, we can always go for the owned version of the immutable data instead of using references. For example <code>Box&lt;str&gt;</code> for <code>String</code> and <code>Box&lt;[u8]&gt;</code> for <code>Vec&lt;u8&gt;</code>.</p><p>In summary, we can always come up with tricks to keep our data structures small, and it will sometimes reward us performance improvement.</p><h3 id="cow" tabindex="-1">Cow <a class="header-anchor" href="#cow" aria-label="Permalink to &quot;Cow&quot;">​</a></h3><p>I first encountered the term <code>Cow</code> when I was studying jsparagus&#39;s code, it has an infrastructure called <a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/212f6bdbc2cae909e7d5cfebf36284560c3c4ef4/crates/parser/src/lexer.rs#L2256" target="_blank" rel="noreferrer"><code>AutoCow</code></a>.</p><p>I vaguely understood what the code was doing. When a JavaScript string is being tokenized, it allocates a new string when it encounters an escaped sequence or it returns the original string slice if it doesn&#39;t:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">finish</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, lexer</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#B392F0;">Lexer</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">alloc</span><span style="color:#E1E4E8;">&gt;) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">alloc</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">match</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">value</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">take</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">Some</span><span style="color:#E1E4E8;">(arena_string) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> arena_string</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">into_bump_str</span><span style="color:#E1E4E8;">(),</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">None</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">start[</span><span style="color:#F97583;">..</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">start</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">len</span><span style="color:#E1E4E8;">() </span><span style="color:#F97583;">-</span><span style="color:#E1E4E8;"> lexer</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">chars</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">as_str</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">len</span><span style="color:#E1E4E8;">()],</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">finish</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, lexer</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#6F42C1;">Lexer</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">alloc</span><span style="color:#24292E;">&gt;) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">alloc</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">str</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">match</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">value</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">take</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">Some</span><span style="color:#24292E;">(arena_string) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> arena_string</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">into_bump_str</span><span style="color:#24292E;">(),</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">None</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">start[</span><span style="color:#D73A49;">..</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">start</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">len</span><span style="color:#24292E;">() </span><span style="color:#D73A49;">-</span><span style="color:#24292E;"> lexer</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">chars</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">as_str</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">len</span><span style="color:#24292E;">()],</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>This is clever because 99.9% of the time it will not allocate a new string because escaped strings are rare.</p><p>But the term <code>Cow</code> or &quot;clone-on-write smart pointer&quot; never made sense to me.</p><blockquote><p>The type Cow is a smart pointer providing clone-on-write functionality: it can enclose and provide immutable access to borrowed data, and clone the data lazily when mutation or ownership is required. The type is designed to work with general borrowed data via the Borrow trait.</p></blockquote><p>If you are new to Rust (like I was), then this description just doesn&#39;t help (I still don&#39;t understand what it is talking about).</p><p>It was <a href="https://twitter.com/zack_overflow/status/1620387950264713216" target="_blank" rel="noreferrer">pointed out to me</a> that <code>clone-on-write</code> is just a use case of this data structure. A better name should be called <code>RefOrOwned</code> because it is a type that contains either owned data or a reference.</p><h3 id="simd" tabindex="-1">SIMD <a class="header-anchor" href="#simd" aria-label="Permalink to &quot;SIMD&quot;">​</a></h3><p>When I was going through the old Rust blogs, the <a href="https://blog.rust-lang.org/inside-rust/2020/09/29/Portable-SIMD-PG.html" target="_blank" rel="noreferrer">Announcing the Portable SIMD Project Group</a> caught my attention. I always wanted to play around with SIMD but never got the chance. After some research, I found a use case that may apply to a parser: <a href="https://lemire.me/blog/2017/01/20/how-quickly-can-you-remove-spaces-from-a-string" target="_blank" rel="noreferrer">How quickly can you remove spaces from a string?</a> by Daniel Lemire. So it turns out this has been done before, in a JSON parser called RapidJSON, which <a href="https://rapidjson.org/md_doc_internals.html#SkipwhitespaceWithSIMD" target="_blank" rel="noreferrer">uses SIMD to remove whitespaces</a>.</p><p>So eventually with the help of portable-SIMD and RapidJSON&#39;s code, not only did I manage to <a href="https://github.com/Boshen/oxc/pull/26" target="_blank" rel="noreferrer">skip whitespaces</a>, I also managed to <a href="https://github.com/Boshen/oxc/pull/23" target="_blank" rel="noreferrer">skip multi-line comments</a> as well.</p><p>Both changes improved the performance by a few percent.</p><h3 id="keyword-match" tabindex="-1">Keyword match <a class="header-anchor" href="#keyword-match" aria-label="Permalink to &quot;Keyword match&quot;">​</a></h3><p>At the top of the performance profile, there is a hot code path that takes about 1 - 2% of the total execution time.</p><p>It tries to match a string to a JavaScript keyword:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">match_keyword</span><span style="color:#E1E4E8;">(s</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#B392F0;">str</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">-&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">Self</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">match</span><span style="color:#E1E4E8;"> s {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;as&quot;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">As</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;do&quot;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Do</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;if&quot;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">If</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">...</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#9ECBFF;">&quot;constructor&quot;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Constructor</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">        _ </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Ident</span><span style="color:#E1E4E8;">,</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">match_keyword</span><span style="color:#24292E;">(s</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#6F42C1;">str</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">-&gt;</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">Self</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">match</span><span style="color:#24292E;"> s {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;as&quot;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">As</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;do&quot;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Do</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;if&quot;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">If</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">...</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#032F62;">&quot;constructor&quot;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Constructor</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">        _ </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Ident</span><span style="color:#24292E;">,</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>With the addition of TypeScript, there are 84 strings for us to match from. After some research, I found a blog from V8 <a href="https://v8.dev/blog/scanner" target="_blank" rel="noreferrer">Blazingly fast parsing, part 1: optimizing the scanner</a>, it describes its <a href="https://source.chromium.org/chromium/chromium/src/+/main:v8/src/parsing/keywords-gen.h" target="_blank" rel="noreferrer">keyword matching code</a> in detail.</p><blockquote><p>Since the list of keywords is static, we can compute a perfect hash function that for each identifier gives us at most one candidate keyword. V8 uses gperf to compute this function. The result computes a hash from the length and first two identifier characters to find the single candidate keyword. We only compare the identifier with the keyword if the length of that keyword matches the input identifier length.</p></blockquote><p>So a quick hash plus an integer comparison should be faster than 84 string comparisons. But we tried <a href="https://github.com/Boshen/oxc/pull/140" target="_blank" rel="noreferrer">again</a> and <a href="https://github.com/Boshen/oxc/pull/171" target="_blank" rel="noreferrer">again</a> to no avail.</p><p>As it turns out, <a href="https://github.com/Boshen/oxc/issues/151#issuecomment-1464818336" target="_blank" rel="noreferrer">LLVM already optimized our code</a>. By using <code>--emit=llvm-ir</code> on <code>rustc</code>, we find the relevant code:</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">  switch i64 %s.1, label %bb6 [</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 2, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 3, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit280.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 4, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit325.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 5, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit380.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 6, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit450.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 7, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit540.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 8, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit590.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 9, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit625.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 10, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit655.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">    i64 11, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit665.i&quot;</span></span>
+<span class="line"><span style="color:#e1e4e8;">  ], !dbg !191362</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">  switch i64 %s.1, label %bb6 [</span></span>
+<span class="line"><span style="color:#24292e;">    i64 2, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 3, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit280.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 4, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit325.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 5, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit380.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 6, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit450.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 7, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit540.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 8, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit590.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 9, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit625.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 10, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit655.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">    i64 11, label %&quot;_ZN4core5slice3cmp81_$LT$impl$u20$core..cmp..PartialEq$LT$$u5b$B$u5d$$GT$$u20$for$u20$$u5b$A$u5d$$GT$2eq17h46d405acb5da4997E.exit665.i&quot;</span></span>
+<span class="line"><span style="color:#24292e;">  ], !dbg !191362</span></span></code></pre></div><p><code>%s</code> is the string, <code>%s.1</code> is its length ... it is branching on the string length! The compiler is smarter than us 😃.</p><p>(Yes, we got so serious with this so we started looking at LLVM IR and assembly code.)</p><p>Later on, <a href="https://twitter.com/strager" target="_blank" rel="noreferrer">@strager</a> posted a very educational YouTube video <a href="https://www.youtube.com/watch?v=DMQ_HcNSOAI" target="_blank" rel="noreferrer">Faster than Rust and C++: the PERFECT hash table </a> on this topic. The video taught us a systematic approach to reasoning about fine-tuning performance problems</p><p>In the end, we concluded that the simple keyword match is enough for us since it was only about 1 - 2% of the performance, and the effort is not worth it after spending a few days on it - Rust does not have all the pieces we need to build this perfect hashmap.</p><h2 id="linter" tabindex="-1">Linter <a class="header-anchor" href="#linter" aria-label="Permalink to &quot;Linter&quot;">​</a></h2><p>A linter is a program that analyzes the source code for problems.</p><p>The simplest linter visits each AST node and checks for rules. <a href="https://rust-unofficial.github.io/patterns/patterns/behavioural/visitor.html" target="_blank" rel="noreferrer">The visitor pattern</a> can be used:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">trait</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Visit</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Sized</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">    // ... lots of visit functions</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">visit_debugger_statement</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, stmt</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">DebuggerStatement</span><span style="color:#E1E4E8;">) {</span></span>
+<span class="line"><span style="color:#6A737D;">        // report error</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">trait</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Visit</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Sized</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">    // ... lots of visit functions</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">visit_debugger_statement</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, stmt</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">DebuggerStatement</span><span style="color:#24292E;">) {</span></span>
+<span class="line"><span style="color:#6A737D;">        // report error</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><h3 id="parent-pointing-tree" tabindex="-1">Parent Pointing Tree <a class="header-anchor" href="#parent-pointing-tree" aria-label="Permalink to &quot;Parent Pointing Tree&quot;">​</a></h3><p>It is easy to go down the AST by using visitors, but what if we want to go up the tree to collect some information?</p><p>This problem is particularly challenging to solve in Rust, because it is not possible to add a pointer to the nodes of the AST.</p><p>Let&#39;s forget about ASTs for a second and focus on generic trees with the property of a node having a pointer to its parent. To build a generic tree, each tree node needs to be the same type <code>Node</code>, we can reference their parent by using <code>Rc</code>:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    parent</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Option</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Rc</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">&gt;&gt;,</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    parent</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Option</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Rc</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">&gt;&gt;,</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>It is tedious to work with this pattern if we need mutation, and it is not performant because the nodes have to be dropped at different times.</p><p>A more efficient solution is to use a <code>Vec</code> as its backing storage and use indexes for pointers.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Tree</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    nodes</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Vec</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">&gt;</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    parent</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Option</span><span style="color:#E1E4E8;">&lt;</span><span style="color:#B392F0;">usize</span><span style="color:#E1E4E8;">&gt;</span><span style="color:#6A737D;"> // index into `nodes`</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Tree</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    nodes</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Vec</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">&gt;</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    parent</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Option</span><span style="color:#24292E;">&lt;</span><span style="color:#6F42C1;">usize</span><span style="color:#24292E;">&gt;</span><span style="color:#6A737D;"> // index into `nodes`</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p><a href="https://crates.io/crates/indextree" target="_blank" rel="noreferrer"><code>indextree</code></a> is a nice library for this task.</p><p>Back to our AST, we can build a <code>indextree</code> by having the nodes point to an enum that wraps every single kind of AST node. We call this the untyped AST.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">struct</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Node</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">enum</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">BlockStatement</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">BlockStatement</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">ArrayExpression</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">ArrayExpression</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#B392F0;">Class</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Class</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">struct</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Node</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">enum</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">BlockStatement</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">BlockStatement</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">ArrayExpression</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">ArrayExpression</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#6F42C1;">Class</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Class</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;),</span></span>
+<span class="line"><span style="color:#6A737D;">    // ...</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>The last missing piece is to have callbacks inside the visitor pattern that builds this tree.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">pub</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">trait</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Visit</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">enter_node</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, _kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {}</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">leave_node</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, _kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">visit_block_statement</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, stmt</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">BlockStatement</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> kind </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">BlockStatement</span><span style="color:#E1E4E8;">(stmt);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">enter_node</span><span style="color:#E1E4E8;">(kind);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">visit_statements</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">stmt</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">body);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">leave_node</span><span style="color:#E1E4E8;">(kind);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">impl</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; </span><span style="color:#B392F0;">Visit</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; </span><span style="color:#F97583;">for</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">TreeBuilder</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt; {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">enter_node</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">push_ast_node</span><span style="color:#E1E4E8;">(kind);</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">fn</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">leave_node</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;mut</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, kind</span><span style="color:#F97583;">:</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">AstKind</span><span style="color:#E1E4E8;">&lt;&#39;</span><span style="color:#B392F0;">a</span><span style="color:#E1E4E8;">&gt;) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">pop_ast_node</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">pub</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">trait</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Visit</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">enter_node</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, _kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {}</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">leave_node</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, _kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">visit_block_statement</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, stmt</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">BlockStatement</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> kind </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">BlockStatement</span><span style="color:#24292E;">(stmt);</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">enter_node</span><span style="color:#24292E;">(kind);</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">visit_statements</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">stmt</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">body);</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">leave_node</span><span style="color:#24292E;">(kind);</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">impl</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; </span><span style="color:#6F42C1;">Visit</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; </span><span style="color:#D73A49;">for</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">TreeBuilder</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt; {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">enter_node</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">push_ast_node</span><span style="color:#24292E;">(kind);</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">fn</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">leave_node</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;mut</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, kind</span><span style="color:#D73A49;">:</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">AstKind</span><span style="color:#24292E;">&lt;&#39;</span><span style="color:#6F42C1;">a</span><span style="color:#24292E;">&gt;) {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">pop_ast_node</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>The final data structure becomes <code>indextree::Arena&lt;Node&lt;&#39;a&gt;&gt;</code> where each <code>Node</code> has a pointer to an <code>AstKind&lt;&#39;a&gt;</code>. <code>indextree::Node::parent</code> can be called to get the parent of any node.</p><p>The nice benefit of making this parent pointing tree is that it becomes convenient to visit AST nodes without having to implement any visitors. A linter becomes a simple loop over all the nodes inside the <code>indextree</code>:</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">for</span><span style="color:#E1E4E8;"> node </span><span style="color:#F97583;">in</span><span style="color:#E1E4E8;"> nodes {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">match</span><span style="color:#E1E4E8;"> node</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">get</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">kind {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">AstKind</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">DebuggerStatement</span><span style="color:#E1E4E8;">(stmt) </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">        // report error</span></span>
+<span class="line"><span style="color:#E1E4E8;">        }</span></span>
+<span class="line"><span style="color:#E1E4E8;">        _ </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {}</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">}</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">for</span><span style="color:#24292E;"> node </span><span style="color:#D73A49;">in</span><span style="color:#24292E;"> nodes {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">match</span><span style="color:#24292E;"> node</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">get</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">kind {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">AstKind</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">DebuggerStatement</span><span style="color:#24292E;">(stmt) </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#6A737D;">        // report error</span></span>
+<span class="line"><span style="color:#24292E;">        }</span></span>
+<span class="line"><span style="color:#24292E;">        _ </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {}</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">}</span></span></code></pre></div><p>A full example is provided <a href="https://github.com/Boshen/oxc/blob/main/crates/oxc_linter/examples/linter.rs" target="_blank" rel="noreferrer">here</a>.</p><p>At first glance, this process may seem slow and inefficient. However, visiting the typed AST through a memory arena and pushing a pointer into <code>indextree</code> are efficient linear memory access patterns. The current benchmark indicates that this approach is 84 times faster than ESLint, so it is certainly fast enough for our purposes.</p><h3 id="processing-files-in-parallel" tabindex="-1">Processing files in parallel <a class="header-anchor" href="#processing-files-in-parallel" aria-label="Permalink to &quot;Processing files in parallel&quot;">​</a></h3><p>The linter uses the <a href="https://crates.io/crates/ignore" target="_blank" rel="noreferrer">ignore</a> crate for directory traversal, it supports <code>.gitignore</code> and adds additional ignore files such as <code>.eslintignore</code>.</p><p>A small problem with this crate is that it does not have a parallel interface, There is no <code>par_iter</code> for <code>ignore::Walk::new(&quot;.&quot;)</code>.</p><p>Instead, <a href="https://github.com/Boshen/oxc/blob/b51c2df3cc43b9f7d57380acc1552fac7db75fab/crates/oxc_cli/src/lint/runner.rs#L116-L139" target="_blank" rel="noreferrer">primitives need to be used</a></p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> walk </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Walk</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">options);</span></span>
+<span class="line"><span style="color:#B392F0;">rayon</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">spawn</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">move</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    walk</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">iter</span><span style="color:#E1E4E8;">()</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">for_each</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">|</span><span style="color:#E1E4E8;">path</span><span style="color:#F97583;">|</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        tx_path</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">send</span><span style="color:#E1E4E8;">(path)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">unwrap</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">    });</span></span>
+<span class="line"><span style="color:#E1E4E8;">});</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> linter </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Arc</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">clone</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#79B8FF;">self</span><span style="color:#F97583;">.</span><span style="color:#E1E4E8;">linter);</span></span>
+<span class="line"><span style="color:#B392F0;">rayon</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">spawn</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">move</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#F97583;">while</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Ok</span><span style="color:#E1E4E8;">(path) </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> rx_path</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">recv</span><span style="color:#E1E4E8;">() {</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> tx_error </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> tx_error</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">clone</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> linter </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Arc</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">clone</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">linter);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        </span><span style="color:#B392F0;">rayon</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">spawn</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">move</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">||</span><span style="color:#E1E4E8;"> {</span></span>
+<span class="line"><span style="color:#E1E4E8;">            </span><span style="color:#F97583;">if</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Some</span><span style="color:#E1E4E8;">(diagnostics) </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">Self</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">lint_path</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">linter, </span><span style="color:#F97583;">&amp;</span><span style="color:#E1E4E8;">path) {</span></span>
+<span class="line"><span style="color:#E1E4E8;">                tx_error</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">send</span><span style="color:#E1E4E8;">(diagnostics)</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">unwrap</span><span style="color:#E1E4E8;">();</span></span>
+<span class="line"><span style="color:#E1E4E8;">            }</span></span>
+<span class="line"><span style="color:#E1E4E8;">            </span><span style="color:#B392F0;">drop</span><span style="color:#E1E4E8;">(tx_error);</span></span>
+<span class="line"><span style="color:#E1E4E8;">        });</span></span>
+<span class="line"><span style="color:#E1E4E8;">    }</span></span>
+<span class="line"><span style="color:#E1E4E8;">});</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> walk </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Walk</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">options);</span></span>
+<span class="line"><span style="color:#6F42C1;">rayon</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">spawn</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">move</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    walk</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">iter</span><span style="color:#24292E;">()</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">for_each</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">|</span><span style="color:#24292E;">path</span><span style="color:#D73A49;">|</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">        tx_path</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">send</span><span style="color:#24292E;">(path)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">unwrap</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">    });</span></span>
+<span class="line"><span style="color:#24292E;">});</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> linter </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Arc</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">clone</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#005CC5;">self</span><span style="color:#D73A49;">.</span><span style="color:#24292E;">linter);</span></span>
+<span class="line"><span style="color:#6F42C1;">rayon</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">spawn</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">move</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">    </span><span style="color:#D73A49;">while</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Ok</span><span style="color:#24292E;">(path) </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> rx_path</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">recv</span><span style="color:#24292E;">() {</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> tx_error </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> tx_error</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">clone</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> linter </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Arc</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">clone</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">linter);</span></span>
+<span class="line"><span style="color:#24292E;">        </span><span style="color:#6F42C1;">rayon</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">spawn</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">move</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">||</span><span style="color:#24292E;"> {</span></span>
+<span class="line"><span style="color:#24292E;">            </span><span style="color:#D73A49;">if</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Some</span><span style="color:#24292E;">(diagnostics) </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">Self</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">lint_path</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">linter, </span><span style="color:#D73A49;">&amp;</span><span style="color:#24292E;">path) {</span></span>
+<span class="line"><span style="color:#24292E;">                tx_error</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">send</span><span style="color:#24292E;">(diagnostics)</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">unwrap</span><span style="color:#24292E;">();</span></span>
+<span class="line"><span style="color:#24292E;">            }</span></span>
+<span class="line"><span style="color:#24292E;">            </span><span style="color:#6F42C1;">drop</span><span style="color:#24292E;">(tx_error);</span></span>
+<span class="line"><span style="color:#24292E;">        });</span></span>
+<span class="line"><span style="color:#24292E;">    }</span></span>
+<span class="line"><span style="color:#24292E;">});</span></span></code></pre></div><p>This unlocks a useful feature where we can print all diagnostics in a single thread, which leads us to the final topic of this article.</p><h3 id="printing-is-slow" tabindex="-1">Printing is slow <a class="header-anchor" href="#printing-is-slow" aria-label="Permalink to &quot;Printing is slow&quot;">​</a></h3><p>Printing the diagnostics was fast, but I have been working on this project for so long that it felt like an eternity to print thousands of diagnostic messages every time I run the linter on huge monorepos. So I started searching through the Rust GitHub issues and eventually found the relevant ones:</p><ul><li><a href="https://github.com/rust-lang/rust/issues/60673" target="_blank" rel="noreferrer">io::Stdout should use block buffering when appropriate</a></li><li><a href="https://github.com/rust-lang/rust/issues/106133" target="_blank" rel="noreferrer">stdin and stdout performance considerations are not documented</a></li></ul><p>In summary, a <code>println!</code> call will lock <code>stdout</code> every time it encounters a newline, this is called line buffering. To make things print faster, we need to opt-in for block buffering which is <a href="https://rust-cli.github.io/book/tutorial/output.html#a-note-on-printing-performance" target="_blank" rel="noreferrer">documented here</a>.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">use</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">std</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">io</span><span style="color:#F97583;">::</span><span style="color:#E1E4E8;">{</span><span style="color:#79B8FF;">self</span><span style="color:#E1E4E8;">, </span><span style="color:#B392F0;">Write</span><span style="color:#E1E4E8;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> stdout </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">io</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">stdout</span><span style="color:#E1E4E8;">();</span><span style="color:#6A737D;"> // get the global stdout entity</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">mut</span><span style="color:#E1E4E8;"> handle </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">io</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">BufWriter</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">new</span><span style="color:#E1E4E8;">(stdout);</span><span style="color:#6A737D;"> // optional: wrap that handle in a buffer</span></span>
+<span class="line"><span style="color:#B392F0;">writeln!</span><span style="color:#E1E4E8;">(handle, </span><span style="color:#9ECBFF;">&quot;foo: {}&quot;</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">42</span><span style="color:#E1E4E8;">);</span><span style="color:#6A737D;"> // add `?` if you care about errors here</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">use</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">std</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">io</span><span style="color:#D73A49;">::</span><span style="color:#24292E;">{</span><span style="color:#005CC5;">self</span><span style="color:#24292E;">, </span><span style="color:#6F42C1;">Write</span><span style="color:#24292E;">};</span></span>
+<span class="line"></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> stdout </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">io</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">stdout</span><span style="color:#24292E;">();</span><span style="color:#6A737D;"> // get the global stdout entity</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">mut</span><span style="color:#24292E;"> handle </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">io</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">BufWriter</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">new</span><span style="color:#24292E;">(stdout);</span><span style="color:#6A737D;"> // optional: wrap that handle in a buffer</span></span>
+<span class="line"><span style="color:#6F42C1;">writeln!</span><span style="color:#24292E;">(handle, </span><span style="color:#032F62;">&quot;foo: {}&quot;</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">42</span><span style="color:#24292E;">);</span><span style="color:#6A737D;"> // add `?` if you care about errors here</span></span></code></pre></div><p>Or acquire the lock on stdout.</p><div class="language-rust vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">rust</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> stdout </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">io</span><span style="color:#F97583;">::</span><span style="color:#B392F0;">stdout</span><span style="color:#E1E4E8;">();</span><span style="color:#6A737D;"> // get the global stdout entity</span></span>
+<span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">mut</span><span style="color:#E1E4E8;"> handle </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> stdout</span><span style="color:#F97583;">.</span><span style="color:#B392F0;">lock</span><span style="color:#E1E4E8;">();</span><span style="color:#6A737D;"> // acquire a lock on it</span></span>
+<span class="line"><span style="color:#B392F0;">writeln!</span><span style="color:#E1E4E8;">(handle, </span><span style="color:#9ECBFF;">&quot;foo: {}&quot;</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">42</span><span style="color:#E1E4E8;">);</span><span style="color:#6A737D;"> // add `?` if you care about errors here</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> stdout </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">io</span><span style="color:#D73A49;">::</span><span style="color:#6F42C1;">stdout</span><span style="color:#24292E;">();</span><span style="color:#6A737D;"> // get the global stdout entity</span></span>
+<span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">mut</span><span style="color:#24292E;"> handle </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> stdout</span><span style="color:#D73A49;">.</span><span style="color:#6F42C1;">lock</span><span style="color:#24292E;">();</span><span style="color:#6A737D;"> // acquire a lock on it</span></span>
+<span class="line"><span style="color:#6F42C1;">writeln!</span><span style="color:#24292E;">(handle, </span><span style="color:#032F62;">&quot;foo: {}&quot;</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">42</span><span style="color:#24292E;">);</span><span style="color:#6A737D;"> // add `?` if you care about errors here</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-30a5e70a data-v-c097fc16><!--[--><!--]--><div class="edit-info" data-v-c097fc16><div class="edit-link" data-v-c097fc16><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/oxc-project/oxc/edit/main/src/ja/docs/learn/performance.md" target="_blank" rel="noreferrer" data-v-c097fc16><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-c097fc16><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> このページを編集する<!--]--></a></div><div class="last-updated" data-v-c097fc16><p class="VPLastUpdated" data-v-c097fc16 data-v-46d1cb64>Last updated: <time datetime="2023-11-27T02:56:00.000Z" data-v-46d1cb64></time></p></div></div><nav class="prev-next" data-v-c097fc16><div class="pager" data-v-c097fc16><a class="pager-link prev" href="/ja/docs/learn/ecmascript/grammar.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Previous page</span><span class="title" data-v-c097fc16>文法</span></a></div><div class="pager" data-v-c097fc16><a class="pager-link next" href="/ja/docs/learn/ecosystem.html" data-v-c097fc16><span class="desc" data-v-c097fc16>Next page</span><span class="title" data-v-c097fc16>エコシステム</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-8574ffd1 data-v-59982766><div class="container" data-v-59982766><!----><p class="copyright" data-v-59982766>© 2023 OXC プロジェクト</p></div></footer><!--[--><!--]--></div></div>
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diff --git a/ja/docs/learn/references.html b/ja/docs/learn/references.html
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&quot;References&quot;">​</a></h1><h2 id="projects-using-oxc" tabindex="-1">Projects Using Oxc <a class="header-anchor" href="#projects-using-oxc" aria-label="Permalink to &quot;Projects Using Oxc&quot;">​</a></h2><h2 id="📚-learning-resources" tabindex="-1">📚 Learning Resources <a class="header-anchor" href="#📚-learning-resources" aria-label="Permalink to &quot;📚 Learning Resources&quot;">​</a></h2><ul><li>My small tutorial on <a href="https://oxc-project.github.io/javascript-parser-in-rust" target="_blank" rel="noreferrer">how to write a JavaScript Parser in Rust</a></li><li>My small article <a href="https://rustmagazine.org/issue-3/javascript-compiler/" target="_blank" rel="noreferrer">Pursuit of Performance on Building a JavaScript Compiler</a></li><li><a href="https://craftinginterpreters.com" target="_blank" rel="noreferrer">Crafting Interpreters</a></li><li><a href="https://vimeo.com/649009599" target="_blank" rel="noreferrer">Andrew Kelley - Practical DOD</a></li></ul><h2 id="parsers-in-active-development" tabindex="-1">Parsers (in active development) <a class="header-anchor" href="#parsers-in-active-development" aria-label="Permalink to &quot;Parsers (in active development)&quot;">​</a></h2><ul><li>Rust <ul><li><a href="https://swc.rs" target="_blank" rel="noreferrer">swc</a></li><li><a href="https://biomejs.dev" target="_blank" rel="noreferrer">Biome</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus" target="_blank" rel="noreferrer">jsparagus</a></li><li><a href="https://github.com/ratel-rust/ratel-core" target="_blank" rel="noreferrer">ratel</a></li><li><a href="https://github.com/lastmjs/boa-azle" target="_blank" rel="noreferrer">boa</a></li></ul></li><li>JavaScript <ul><li><a href="https://github.com/acornjs/acorn" target="_blank" rel="noreferrer">acorn</a></li><li><a href="https://babeljs.io" target="_blank" rel="noreferrer">babel</a></li></ul></li><li>Go <ul><li><a href="https://esbuild.github.io" target="_blank" rel="noreferrer">esbuild</a></li></ul></li><li>C++ <ul><li><a href="https://github.com/quick-lint/quick-lint-js" target="_blank" rel="noreferrer">quick-lint-js</a></li></ul></li></ul><h2 id="ast" tabindex="-1">AST <a class="header-anchor" href="#ast" aria-label="Permalink to &quot;AST&quot;">​</a></h2><ul><li><a href="https://github.com/estree/estree" target="_blank" rel="noreferrer">estree</a></li><li><a href="https://github.com/swc-project/swc/tree/main/crates/swc_ecma_ast/src" target="_blank" rel="noreferrer">swc_ecma_ast</a></li><li><a href="https://github.com/babel/babel/blob/main/packages/babel-types/src/ast-types/generated/index.ts" target="_blank" rel="noreferrer">babel ast</a></li><li><a href="https://gist.github.com/Boshen/0b481a058cd715576aaf1624d2c6d469" target="_blank" rel="noreferrer">jsparagus</a></li></ul><h2 id="rust" tabindex="-1">Rust <a class="header-anchor" href="#rust" aria-label="Permalink to &quot;Rust&quot;">​</a></h2><ul><li><a href="https://nnethercote.github.io/perf-book/introduction.html" target="_blank" rel="noreferrer">The Rust Performance Book</a></li></ul><h2 id="blog-posts" tabindex="-1">Blog Posts <a class="header-anchor" href="#blog-posts" aria-label="Permalink to &quot;Blog Posts&quot;">​</a></h2><ul><li><a href="https://v8.dev/blog/scanner" target="_blank" rel="noreferrer">Blazingly fast parsing, part 1: optimizing the scanner</a></li><li><a href="https://v8.dev/blog/preparser" target="_blank" rel="noreferrer">Blazingly fast parsing, part 2: lazy parsing</a></li><li><a href="https://v8.dev/blog/tags/understanding-ecmascript" target="_blank" rel="noreferrer">Understanding ECMAScript</a></li><li><a href="https://matklad.github.io/2020/04/13/simple-but-powerful-pratt-parsing.html" target="_blank" rel="noreferrer">Simple but Powerful Pratt Parsing</a></li><li><a href="https://github.com/mozilla-spidermonkey/jsparagus/blob/master/js-quirks.md" target="_blank" rel="noreferrer">JS syntactic 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data-v-fb6bac11><!--[--><article class="box" data-v-fb6bac11><!----><h2 class="title" data-v-fb6bac11>Parser ✅</h2><p class="details" data-v-fb6bac11>SWCの2倍速</p><div class="link-text" data-v-fb6bac11><p class="link-text-value" data-v-fb6bac11>さらに学ぶ <svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="link-text-icon" data-v-fb6bac11><path d="M19.9,12.4c0.1-0.2,0.1-0.5,0-0.8c-0.1-0.1-0.1-0.2-0.2-0.3l-7-7c-0.4-0.4-1-0.4-1.4,0s-0.4,1,0,1.4l5.3,5.3H5c-0.6,0-1,0.4-1,1s0.4,1,1,1h11.6l-5.3,5.3c-0.4,0.4-0.4,1,0,1.4c0.2,0.2,0.5,0.3,0.7,0.3s0.5-0.1,0.7-0.3l7-7C19.8,12.6,19.9,12.5,19.9,12.4z"></path></svg></p></div></article><!--]--></a></div><div class="grid-6 item" data-v-3190607f><a class="VPLink link no-icon VPFeature" href="/ja/docs/guide/usage/linter.html" data-v-3190607f data-v-fb6bac11><!--[--><article class="box" data-v-fb6bac11><!----><h2 class="title" data-v-fb6bac11>Linter ✅</h2><p class="details" data-v-fb6bac11>ESLintの50~100倍速</p><div class="link-text" 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data-v-fb6bac11><!--[--><article class="box" data-v-fb6bac11><!----><h2 class="title" data-v-fb6bac11>Minifier 🚧</h2><p class="details" data-v-fb6bac11>より早く効率的な圧縮</p><!----></article><!--]--></div></div><div class="grid-6 item" data-v-3190607f><a class="VPLink link vp-external-link-icon no-icon VPFeature" href="https://rspack.dev" target="_blank" rel="noreferrer" data-v-3190607f data-v-fb6bac11><!--[--><article class="box" data-v-fb6bac11><!----><h2 class="title" data-v-fb6bac11>Rspack ✅</h2><p class="details" data-v-fb6bac11>Webpack互換</p><!----></article><!--]--></a></div><div class="grid-6 item" data-v-3190607f><div class="VPLink no-icon VPFeature" data-v-3190607f data-v-fb6bac11><!--[--><article class="box" data-v-fb6bac11><!----><h2 class="title" data-v-fb6bac11>Rolldown</h2><p class="details" data-v-fb6bac11>Rust製Rollup</p><!----></article><!--]--></div></div><div class="grid-6 item" data-v-3190607f><a class="VPLink link vp-external-link-icon no-icon VPFeature" 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