Add a CLI to create new Parcel apps

.eslintignore

@@ -11,6 +11,7 @@ packages/*/*/test/mochareporters.json
 packages/core/integration-tests/test/input/**
 packages/core/utils/test/input/**
 packages/utils/create-react-app/templates
+packages/utils/create-parcel-app/templates
 packages/examples
 
 # Generated by the build

gulpfile.js

@@ -32,6 +32,7 @@ const paths = {
   packageJson: [
     'packages/core/parcel/package.json',
     'packages/utils/create-react-app/package.json',
+    'packages/utils/create-parcel/package.json',
     'packages/dev/query/package.json',
     'packages/dev/bundle-stats-cli/package.json',
   ],

packages/core/integration-tests/package.json

@@ -20,7 +20,8 @@
     "@babel/preset-env": "^7.22.14",
     "@babel/preset-typescript": "^7.22.11",
     "@mdx-js/react": "^1.5.3",
-    "@types/react": "^17",
+    "@types/react": "^19",
+    "@types/react-dom": "^19",
     "autoprefixer": "^10.4.0",
     "chalk": "^4.1.2",
     "command-exists": "^1.2.6",

packages/packagers/react-static/src/ReactStaticPackager.js

@@ -264,7 +264,6 @@ async function loadBundleUncached(
           ];
         });
       } else if (entryBundle) {
-        // console.log('here', entryBundle)
         queue.add(async () => {
           let {assets: subAssets} = await loadBundle(
             entryBundle,

packages/reporters/dev-server/src/NodeRunner.js

@@ -5,6 +5,7 @@ import {md, errorToDiagnostic} from '@parcel/diagnostic';
 import nullthrows from 'nullthrows';
 import {Worker} from 'worker_threads';
 import path from 'path';
+import {type Deferred, makeDeferredWithPromise} from '@parcel/utils';
 import type {HMRMessage} from './HMRServer';
 
 export type NodeRunnerOptions = {|
@@ -15,7 +16,8 @@ export type NodeRunnerOptions = {|
 export class NodeRunner {
   worker: Worker | null = null;
   bundleGraph: BundleGraph<PackagedBundle> | null = null;
-  pending: boolean = true;
+  pending: Promise<void> | null = null;
+  deferred: Deferred<void> | null = null;
   logger: PluginLogger;
   hmr: boolean;
 
@@ -25,17 +27,25 @@ export class NodeRunner {
   }
 
   buildStart() {
-    this.pending = true;
+    let {deferred, promise} = makeDeferredWithPromise();
+    this.pending = promise;
+    this.deferred = deferred;
   }
 
-  buildSuccess(bundleGraph: BundleGraph<PackagedBundle>) {
+  async buildSuccess(bundleGraph: BundleGraph<PackagedBundle>) {
     this.bundleGraph = bundleGraph;
-    this.pending = false;
+
+    let deferred = this.deferred;
+    this.pending = null;
+    this.deferred = null;
+
     if (this.worker == null) {
-      this.startWorker();
+      await this.startWorker();
     } else if (!this.hmr) {
-      this.restartWorker();
+      await this.restartWorker();
     }
+
+    deferred?.resolve();
   }
 
   startWorker(): Promise<void> {
@@ -88,7 +98,11 @@ export class NodeRunner {
       this.worker = worker;
 
       return new Promise(resolve => {
-        worker.once('online', () => resolve());
+        if (this.hmr) {
+          worker.once('message', () => resolve());
+        } else {
+          worker.once('online', () => resolve());
+        }
       });
     } else {
       return Promise.resolve();
@@ -107,6 +121,8 @@ export class NodeRunner {
     // If the build is still pending, wait until it completes to restart.
     if (!this.pending) {
       await this.startWorker();
+    } else {
+      await this.pending;
     }
   }
 

packages/reporters/dev-server/src/ServerReporter.js

@@ -121,9 +121,13 @@ export default (new Reporter({
             // If running in node, wait for the server to update before emitting the update
             // on the client. This ensures that when the client reloads the server is ready.
             if (nodeRunner) {
-              await nodeRunner.emitUpdate(update);
+              // Don't await here because that blocks the build from continuing
+              // and we may need to wait for the buildSuccess event.
+              let hmr = hmrServer;
+              nodeRunner.emitUpdate(update).then(() => hmr.broadcast(update));
+            } else {
+              hmrServer.broadcast(update);
             }
-            hmrServer.broadcast(update);
           }
         }
         break;

packages/runtimes/hmr/src/loaders/hmr-runtime.js

@@ -153,6 +153,9 @@ if (!parent || !parent.isParcelRequire) {
             parentPort.postMessage('restart');
           }
         });
+
+        // After the bundle has finished running, notify the dev server that the HMR update is complete.
+        queueMicrotask(() => parentPort.postMessage('ready'));
       }
     } catch {
       if (typeof WebSocket !== 'undefined') {

packages/transformers/js/src/JSTransformer.js

@@ -404,12 +404,10 @@ export default (new Transformer({
     let supportsModuleWorkers =
       asset.env.shouldScopeHoist && asset.env.supports('worker-module', true);
     let isJSX = Boolean(config?.isJSX);
-    if (asset.isSource) {
-      if (asset.type === 'ts') {
-        isJSX = false;
-      } else if (!isJSX) {
-        isJSX = Boolean(JSX_EXTENSIONS[asset.type]);
-      }
+    if (asset.type === 'ts') {
+      isJSX = false;
+    } else if (!isJSX) {
+      isJSX = Boolean(JSX_EXTENSIONS[asset.type]);
     }
 
     let type = 'js';

packages/utils/create-parcel/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "create-parcel",
+  "version": "2.13.3",
+  "bin": {
+    "create-parcel": "lib/create-parcel.js"
+  },
+  "main": "src/create-parcel.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/parcel-bundler/parcel.git",
+    "directory": "packages/utils/create-parcel"
+  },
+  "source": "src/create-parcel.js",
+  "files": [
+    "templates",
+    "lib"
+  ],
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {}
+}

packages/utils/create-parcel/src/create-parcel.js

@@ -0,0 +1,190 @@
+#!/usr/bin/env node
+
+// @flow
+/* eslint-disable no-console */
+
+// $FlowFixMe
+import fs from 'fs/promises';
+import {readdirSync} from 'fs';
+import path from 'path';
+import {spawn as _spawn} from 'child_process';
+// $FlowFixMe
+import {parseArgs, styleText} from 'util';
+
+const supportsEmoji = isUnicodeSupported();
+
+// Fallback symbols for Windows from https://en.wikipedia.org/wiki/Code_page_437
+const success: string = supportsEmoji ? '✨' : '√';
+const error: string = supportsEmoji ? '🚨' : '×';
+
+const {positionals} = parseArgs({
+  allowPositionals: true,
+  options: {},
+});
+
+let template = positionals[0];
+if (!template) {
+  let packageManager = getCurrentPackageManager()?.name;
+  console.error(
+    `Usage: ${packageManager ?? 'npm'} create <template> [directory]\n`,
+  );
+  printAvailableTemplates();
+  console.log('');
+  process.exit(1);
+}
+
+let name = positionals[1];
+if (!name) {
+  name = '.';
+}
+
+install(template, name).then(
+  () => {
+    process.exit(0);
+  },
+  err => {
+    console.error(err);
+    process.exit(1);
+  },
+);
+
+async function install(template: string, name: string) {
+  let templateDir = path.join(__dirname, '..', 'templates', template);
+  try {
+    await fs.stat(templateDir);
+  } catch {
+    console.error(
+      style(['red', 'bold'], `${error} Unknown template ${template}.\n`),
+    );
+    printAvailableTemplates();
+    console.log('');
+    process.exit(1);
+    return;
+  }
+
+  if (name === '.') {
+    if ((await fs.readdir(name)).length !== 0) {
+      console.error(style(['red', 'bold'], `${error} Directory is not empty.`));
+      process.exit(1);
+      return;
+    }
+  } else {
+    try {
+      await fs.stat(name);
+      console.error(style(['red', 'bold'], `${error} ${name} already exists.`));
+      process.exit(1);
+      return;
+    } catch {
+      // ignore
+    }
+    await fs.mkdir(name, {recursive: true});
+  }
+
+  await spawn('git', ['init'], {
+    stdio: 'inherit',
+    cwd: name,
+  });
+
+  await fs.cp(templateDir, name, {
+    recursive: true,
+  });
+
+  let packageManager = getCurrentPackageManager()?.name;
+  switch (packageManager) {
+    case 'yarn':
+      await spawn('yarn', [], {cwd: name, stdio: 'inherit'});
+      break;
+    case 'pnpm':
+      await spawn('pnpm', ['install'], {cwd: name, stdio: 'inherit'});
+      break;
+    case 'npm':
+    default:
+      await spawn(
+        'npm',
+        ['install', '--legacy-peer-deps', '--no-audit', '--no-fund'],
+        {cwd: name, stdio: 'inherit'},
+      );
+      break;
+  }
+
+  await spawn('git', ['add', '-A'], {cwd: name});
+  await spawn(
+    'git',
+    ['commit', '--quiet', '-a', '-m', 'Initial commit from create-parcel'],
+    {
+      stdio: 'inherit',
+      cwd: name,
+    },
+  );
+
+  console.log('');
+  console.log(style(['green', 'bold'], `${success} Your new app is ready!\n`));
+  console.log('To get started, run the following commands:');
+  console.log('');
+  if (name !== '.') {
+    console.log(`  cd ${name}`);
+  }
+  console.log(`  ${packageManager ?? 'npm'} start`);
+  console.log('');
+}
+
+function spawn(cmd, args, opts) {
+  return new Promise((resolve, reject) => {
+    let p = _spawn(cmd, args, opts);
+    p.on('close', (code, signal) => {
+      if (code || signal) {
+        reject(new Error(`${cmd} failed with exit code ${code}`));
+      } else {
+        resolve();
+      }
+    });
+  });
+}
+
+function getCurrentPackageManager(
+  userAgent: ?string = process.env.npm_config_user_agent,
+): ?{|name: string, version: string|} {
+  if (!userAgent) {
+    return undefined;
+  }
+
+  const pmSpec = userAgent.split(' ')[0];
+  const separatorPos = pmSpec.lastIndexOf('/');
+  const name = pmSpec.substring(0, separatorPos);
+  return {
+    name: name,
+    version: pmSpec.substring(separatorPos + 1),
+  };
+}
+
+function printAvailableTemplates() {
+  console.error('Available templates:\n');
+  for (let dir of readdirSync(path.join(__dirname, '..', 'templates'))) {
+    console.error(`  • ${dir}`);
+  }
+}
+
+// From https://github.com/sindresorhus/is-unicode-supported/blob/8f123916d5c25a87c4f966dcc248b7ca5df2b4ca/index.js
+// This package is ESM-only so it has to be vendored
+function isUnicodeSupported() {
+  if (process.platform !== 'win32') {
+    return process.env.TERM !== 'linux'; // Linux console (kernel)
+  }
+
+  return (
+    Boolean(process.env.CI) ||
+    Boolean(process.env.WT_SESSION) || // Windows Terminal
+    process.env.ConEmuTask === '{cmd::Cmder}' || // ConEmu and cmder
+    process.env.TERM_PROGRAM === 'vscode' ||
+    process.env.TERM === 'xterm-256color' ||
+    process.env.TERM === 'alacritty'
+  );
+}
+
+function style(format, text) {
+  if (styleText) {
+    return styleText(format, text);
+  } else {
+    return text;
+  }
+}

packages/utils/create-parcel/templates/react-client/.gitignore

@@ -0,0 +1,3 @@
+.parcel-cache/
+dist/
+node_modules/

packages/utils/create-parcel/templates/react-client/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "parcel-react-client-starter",
+  "private": true,
+  "version": "0.0.0",
+  "source": "src/index.html",
+  "scripts": {
+    "start": "parcel",
+    "build": "parcel build"
+  },
+  "dependencies": {
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
+  },
+  "devDependencies": {
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "parcel": "^2.13.3"
+  }
+}

packages/utils/create-parcel/templates/react-client/src/App.css

@@ -0,0 +1,8 @@
+html {
+  color-scheme: light dark;
+  font-family: system-ui;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  height: 100%;
+}