From 6dd71c6d050630fe3ee29728f906884ab627987a Mon Sep 17 00:00:00 2001
From: camc314 <18101008+camc314@users.noreply.github.com>
Date: Tue, 3 Dec 2024 13:15:49 +0000
Subject: [PATCH] test(linter): port eslint tests to no-unused-expressions
 (#7611)

---
 .../rules/typescript/no_unused_expressions.rs | 103 +++++++
 .../typescript_no_unused_expressions.snap     | 256 ++++++++++++++++++
 2 files changed, 359 insertions(+)

diff --git a/crates/oxc_linter/src/rules/typescript/no_unused_expressions.rs b/crates/oxc_linter/src/rules/typescript/no_unused_expressions.rs
index 374b4e30e4185..9b3ccec059a53 100644
--- a/crates/oxc_linter/src/rules/typescript/no_unused_expressions.rs
+++ b/crates/oxc_linter/src/rules/typescript/no_unused_expressions.rs
@@ -191,6 +191,57 @@ fn test() {
     use crate::tester::Tester;
 
     let pass = vec![
+        // https://github.com/eslint/eslint/blob/946ae00457265eb298eb169d6d48ca7ec71b9eef/tests/lib/rules/no-unused-expressions.js#L21
+        ("function f(){}", None),
+        ("a = b", None),
+        ("new a", None),
+        ("{}", None),
+        ("f(); g()", None),
+        ("i++", None),
+        ("a()", None),
+        ("a && a()", Some(serde_json::json!([{ "allowShortCircuit": true }]))),
+        ("a() || (b = c)", Some(serde_json::json!([{ "allowShortCircuit": true }]))),
+        ("a ? b() : c()", Some(serde_json::json!([{ "allowTernary": true }]))),
+        (
+            "a ? b() || (c = d) : e()",
+            Some(serde_json::json!([{ "allowShortCircuit": true, "allowTernary": true }])),
+        ),
+        ("delete foo.bar", None),
+        ("void new C", None),
+        (r#""use strict";"#, None),
+        (r#""directive one"; "directive two"; f();"#, None),
+        (r#"function foo() {"use strict"; return true; }"#, None),
+        (r#"var foo = () => {"use strict"; return true; }"#, None), // { "ecmaVersion": 6 },
+        (r#"function foo() {"directive one"; "directive two"; f(); }"#, None),
+        (r#"function foo() { var foo = "use strict"; return true; }"#, None),
+        ("function* foo(){ yield 0; }", None), // { "ecmaVersion": 6 },
+        ("async function foo() { await 5; }", None), // { "ecmaVersion": 8 },
+        ("async function foo() { await foo.bar; }", None), // { "ecmaVersion": 8 },
+        (
+            "async function foo() { bar && await baz; }",
+            Some(serde_json::json!([{ "allowShortCircuit": true }])),
+        ), // { "ecmaVersion": 8 },
+        (
+            "async function foo() { foo ? await bar : await baz; }",
+            Some(serde_json::json!([{ "allowTernary": true }])),
+        ), // { "ecmaVersion": 8 },
+        (
+            "tag`tagged template literal`",
+            Some(serde_json::json!([{ "allowTaggedTemplates": true }])),
+        ), // { "ecmaVersion": 6 },
+        (
+            "shouldNotBeAffectedByAllowTemplateTagsOption()",
+            Some(serde_json::json!([{ "allowTaggedTemplates": true }])),
+        ), // { "ecmaVersion": 6 },
+        (r#"import("foo")"#, None),            // { "ecmaVersion": 11 },
+        (r#"func?.("foo")"#, None),            // { "ecmaVersion": 11 },
+        (r#"obj?.foo("bar")"#, None),          // { "ecmaVersion": 11 },
+        ("<div />", None), // { "parserOptions": { "ecmaFeatures": { "jsx": true } } },
+        ("<></>", None),   // { "parserOptions": { "ecmaFeatures": { "jsx": true } } },
+        ("var partial = <div />", None), // { "parserOptions": { "ecmaFeatures": { "jsx": true } } },
+        ("var partial = <div />", Some(serde_json::json!([{ "enforceForJSX": true }]))), // { "parserOptions": { "ecmaFeatures": { "jsx": true } } },
+        ("var partial = <></>", Some(serde_json::json!([{ "enforceForJSX": true }]))), // { "parserOptions": { "ecmaFeatures": { "jsx": true } } }
+        // https://github.com/typescript-eslint/typescript-eslint/blob/32a7a7061abba5bbf1403230526514768d3e2760/packages/eslint-plugin/tests/rules/no-unused-expressions.test.ts#L29
         (
             "
 			      test.age?.toLocaleString();
@@ -285,6 +336,58 @@ fn test() {
     ];
 
     let fail = vec![
+        // https://github.com/eslint/eslint/blob/946ae00457265eb298eb169d6d48ca7ec71b9eef/tests/lib/rules/no-unused-expressions.js#L111
+        ("0", None),
+        ("a", None),
+        ("f(), 0", None),
+        ("{0}", None),
+        ("[]", None),
+        ("a && b();", None),
+        ("a() || false", None),
+        ("a || (b = c)", None),
+        ("a ? b() || (c = d) : e", None),
+        ("`untagged template literal`", None), // { "ecmaVersion": 6 },
+        ("tag`tagged template literal`", None), // { "ecmaVersion": 6 },
+        ("a && b()", Some(serde_json::json!([{ "allowTernary": true }]))),
+        ("a ? b() : c()", Some(serde_json::json!([{ "allowShortCircuit": true }]))),
+        ("a || b", Some(serde_json::json!([{ "allowShortCircuit": true }]))),
+        ("a() && b", Some(serde_json::json!([{ "allowShortCircuit": true }]))),
+        ("a ? b : 0", Some(serde_json::json!([{ "allowTernary": true }]))),
+        ("a ? b : c()", Some(serde_json::json!([{ "allowTernary": true }]))),
+        ("foo.bar;", None),
+        ("!a", None),
+        ("+a", None),
+        (r#""directive one"; f(); "directive two";"#, None),
+        (r#"function foo() {"directive one"; f(); "directive two"; }"#, None),
+        (r#"if (0) { "not a directive"; f(); }"#, None),
+        (r#"function foo() { var foo = true; "use strict"; }"#, None),
+        (r#"var foo = () => { var foo = true; "use strict"; }"#, None), // { "ecmaVersion": 6 },
+        (
+            "`untagged template literal`",
+            Some(serde_json::json!([{ "allowTaggedTemplates": true }])),
+        ), // { "ecmaVersion": 6 },
+        (
+            "`untagged template literal`",
+            Some(serde_json::json!([{ "allowTaggedTemplates": false }])),
+        ), // { "ecmaVersion": 6 },
+        (
+            "tag`tagged template literal`",
+            Some(serde_json::json!([{ "allowTaggedTemplates": false }])),
+        ), // { "ecmaVersion": 6 },
+        ("obj?.foo", None),                                             // { "ecmaVersion": 2020 },
+        ("obj?.foo.bar", None),                                         // { "ecmaVersion": 2020 },
+        ("obj?.foo().bar", None),                                       // { "ecmaVersion": 2020 },
+        ("<div />", Some(serde_json::json!([{ "enforceForJSX": true }]))), // { "parserOptions": { "ecmaFeatures": { "jsx": true } } },
+        ("<></>", Some(serde_json::json!([{ "enforceForJSX": true }]))), // { "parserOptions": { "ecmaFeatures": { "jsx": true } } },
+        ("class C { static { 'use strict'; } }", None),                  // { "ecmaVersion": 2022 },
+        (
+            "class C { static { 
+			'foo'
+			'bar'
+			 } }",
+            None,
+        ), // { "ecmaVersion": 2022 }
+        // https://github.com/typescript-eslint/typescript-eslint/blob/32a7a7061abba5bbf1403230526514768d3e2760/packages/eslint-plugin/tests/rules/no-unused-expressions.test.ts#L91
         (
             "
 			if (0) 0;
diff --git a/crates/oxc_linter/src/snapshots/typescript_no_unused_expressions.snap b/crates/oxc_linter/src/snapshots/typescript_no_unused_expressions.snap
index d06ee11f31264..39fda8439bca9 100644
--- a/crates/oxc_linter/src/snapshots/typescript_no_unused_expressions.snap
+++ b/crates/oxc_linter/src/snapshots/typescript_no_unused_expressions.snap
@@ -1,6 +1,262 @@
 ---
 source: crates/oxc_linter/src/tester.rs
 ---
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ 0
+   · ─
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a
+   · ─
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ f(), 0
+   · ──────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:2]
+ 1 │ {0}
+   ·  ─
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ []
+   · ──
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a && b();
+   · ─────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a() || false
+   · ────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a || (b = c)
+   · ────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a ? b() || (c = d) : e
+   · ──────────────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ `untagged template literal`
+   · ───────────────────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ tag`tagged template literal`
+   · ────────────────────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a && b()
+   · ────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a ? b() : c()
+   · ─────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a || b
+   · ──────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a() && b
+   · ────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a ? b : 0
+   · ─────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ a ? b : c()
+   · ───────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ foo.bar;
+   · ────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ !a
+   · ──
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ +a
+   · ──
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:23]
+ 1 │ "directive one"; f(); "directive two";
+   ·                       ────────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:39]
+ 1 │ function foo() {"directive one"; f(); "directive two"; }
+   ·                                       ────────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:10]
+ 1 │ if (0) { "not a directive"; f(); }
+   ·          ──────────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:34]
+ 1 │ function foo() { var foo = true; "use strict"; }
+   ·                                  ─────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:35]
+ 1 │ var foo = () => { var foo = true; "use strict"; }
+   ·                                   ─────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ `untagged template literal`
+   · ───────────────────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ `untagged template literal`
+   · ───────────────────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ tag`tagged template literal`
+   · ────────────────────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ obj?.foo
+   · ────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ obj?.foo.bar
+   · ────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ obj?.foo().bar
+   · ──────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ <div />
+   · ───────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:1]
+ 1 │ <></>
+   · ─────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:1:20]
+ 1 │ class C { static { 'use strict'; } }
+   ·                    ─────────────
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:2:4]
+ 1 │ class C { static { 
+ 2 │             'foo'
+   ·             ─────
+ 3 │             'bar'
+   ╰────
+  help: Consider removing this expression
+
+  ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
+   ╭─[no_unused_expressions.tsx:3:4]
+ 2 │             'foo'
+ 3 │             'bar'
+   ·             ─────
+ 4 │              } }
+   ╰────
+  help: Consider removing this expression
+
   ⚠ typescript-eslint(no-unused-expressions): Disallow unused expressions
    ╭─[no_unused_expressions.tsx:2:11]
  1 │