launch: check prerequisites in a pre-launch task

Fixes https://github.com/microsoft/vscode/issues/103708

.vscode/launch.json

@@ -216,10 +216,10 @@
 			"port": 9222,
 			"timeout": 20000,
 			"env": {
-				"VSCODE_EXTHOST_WILL_SEND_SOCKET": null
+				"VSCODE_EXTHOST_WILL_SEND_SOCKET": null,
+				"VSCODE_SKIP_PRELAUNCH": "1"
 			},
 			"cleanUp": "wholeBrowser",
-			"breakOnLoad": false,
 			"urlFilter": "*workbench.html*",
 			"runtimeArgs": [
 				"--inspect=5875",
@@ -232,7 +232,8 @@
 			"outFiles": [
 				"${workspaceFolder}/out/**/*.js"
 			],
-			"browserLaunchLocation": "workspace"
+			"browserLaunchLocation": "workspace",
+			"preLaunchTask": "Ensure Prelaunch Dependencies",
 		},
 		{
 			"type": "node",

.vscode/tasks.json

@@ -186,6 +186,14 @@
 				"source": "eslint",
 				"base": "$eslint-stylish"
 			}
-		}
+		},
+		{
+			"type": "shell",
+			"command": "node build/lib/prelaunch.js",
+			"label": "Ensure Prelaunch Dependencies",
+			"presentation": {
+				"reveal": "silent"
+			}
+		},
 	]
 }

build/lib/builtInExtensions.js

@@ -100,7 +100,7 @@ function writeControlFile(control) {
 	fs.writeFileSync(controlFilePath, JSON.stringify(control, null, 2));
 }
 
-function main() {
+exports.getBuiltInExtensions = function getBuiltInExtensions() {
 	log('Syncronizing built-in extensions...');
 	log(`You can manage built-in extensions with the ${ansiColors.cyan('--builtin')} flag`);
 
@@ -116,14 +116,16 @@ function main() {
 
 	writeControlFile(control);
 
-	es.merge(streams)
+	return new Promise((resolve, reject) => {
-		.on('error', err => {
+		es.merge(streams)
-			console.error(err);
+			.on('error', reject)
-			process.exit(1);
+			.on('end', resolve);
-		})
+	});
-		.on('end', () => {
+};
-			process.exit(0);
-		});
-}
 
-main();
+if (require.main === module) {
+	main().then(() => process.exit(0)).catch(err => {
+		console.error(err);
+		process.exit(1);
+	});
+}

build/lib/preLaunch.js

@@ -0,0 +1,55 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+Object.defineProperty(exports, "__esModule", { value: true });
+// @ts-check
+const path = require("path");
+const child_process_1 = require("child_process");
+const fs_1 = require("fs");
+const yarn = process.platform === 'win32' ? 'yarn.cmd' : 'yarn';
+const rootDir = path.resolve(__dirname, '..', '..');
+function runProcess(command, args = []) {
+    return new Promise((resolve, reject) => {
+        const child = child_process_1.spawn(command, args, { cwd: rootDir, stdio: 'inherit', env: process.env });
+        child.on('exit', err => !err ? resolve() : process.exit(err !== null && err !== void 0 ? err : 1));
+        child.on('error', reject);
+    });
+}
+async function exists(subdir) {
+    try {
+        await fs_1.promises.stat(path.join(rootDir, subdir));
+        return true;
+    }
+    catch (_a) {
+        return false;
+    }
+}
+async function ensureNodeModules() {
+    if (!(await exists('node_modules'))) {
+        await runProcess(yarn);
+    }
+}
+async function getElectron() {
+    await runProcess(yarn, ['electron']);
+}
+async function ensureCompiled() {
+    if (!(await exists('out'))) {
+        await runProcess(yarn, ['compile']);
+    }
+}
+async function main() {
+    await ensureNodeModules();
+    await getElectron();
+    await ensureCompiled();
+    // Can't require this until after dependencies are installed
+    const { getBuiltInExtensions } = require('./builtInExtensions');
+    await getBuiltInExtensions();
+}
+if (require.main === module) {
+    main().catch(err => {
+        console.error(err);
+        process.exit(1);
+    });
+}

build/lib/preLaunch.ts

@@ -0,0 +1,65 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+// @ts-check
+
+import * as path from 'path';
+import { spawn } from 'child_process';
+import { promises as fs } from 'fs';
+
+const yarn = process.platform === 'win32' ? 'yarn.cmd' : 'yarn';
+const rootDir = path.resolve(__dirname, '..', '..');
+
+function runProcess(command: string, args: ReadonlyArray<string> = []) {
+	return new Promise((resolve, reject) => {
+		const child = spawn(command, args, { cwd: rootDir, stdio: 'inherit', env: process.env });
+		child.on('exit', err => !err ? resolve() : process.exit(err ?? 1));
+		child.on('error', reject);
+	});
+}
+
+async function exists(subdir: string) {
+	try {
+		await fs.stat(path.join(rootDir, subdir));
+		return true;
+	} catch {
+		return false;
+	}
+}
+
+async function ensureNodeModules() {
+	if (!(await exists('node_modules'))) {
+		await runProcess(yarn);
+	}
+}
+
+async function getElectron() {
+	await runProcess(yarn, ['electron']);
+}
+
+async function ensureCompiled() {
+	if (!(await exists('out'))) {
+		await runProcess(yarn, ['compile']);
+	}
+}
+
+async function main() {
+	await ensureNodeModules();
+	await getElectron();
+	await ensureCompiled();
+
+	// Can't require this until after dependencies are installed
+	const { getBuiltInExtensions } = require('./builtInExtensions');
+	await getBuiltInExtensions();
+}
+
+if (require.main === module) {
+	main().catch(err => {
+		console.error(err);
+		process.exit(1);
+	});
+}

scripts/code-cli.bat

@@ -5,27 +5,17 @@ title VSCode Dev
 
 pushd %~dp0\..
 
-:: Node modules
+:: Get electron, compile, built-in extensions
-if not exist node_modules call yarn
+if "%VSCODE_SKIP_PRELAUNCH%"=="" node build/lib/preLaunch.js
 
 for /f "tokens=2 delims=:," %%a in ('findstr /R /C:"\"nameShort\":.*" product.json') do set NAMESHORT=%%~a
 set NAMESHORT=%NAMESHORT: "=%
 set NAMESHORT=%NAMESHORT:"=%.exe
 set CODE=".build\electron\%NAMESHORT%"
 
-:: Download Electron if needed
-node build\lib\electron.js
-if %errorlevel% neq 0 node .\node_modules\gulp\bin\gulp.js electron
-
 :: Manage built-in extensions
 if "%1"=="--builtin" goto builtin
 
-:: Sync built-in extensions
-node build\lib\builtInExtensions.js
-
-:: Build
-if not exist out yarn compile
-
 :: Configuration
 set ELECTRON_RUN_AS_NODE=1
 set NODE_ENV=development

scripts/code-cli.sh

@@ -18,11 +18,10 @@ function code() {
 		CODE=".build/electron/$NAME"
 	fi
 
-	# Node modules
+	# Get electron, compile, built-in extensions
-	test -d node_modules || yarn
+	if [[ -z "${VSCODE_SKIP_PRELAUNCH}" ]]; then
-
+		node build/lib/preLaunch.js
-	# Get electron
+	fi
-	yarn electron
 
 	# Manage built-in extensions
 	if [[ "$1" == "--builtin" ]]; then
@@ -30,12 +29,6 @@ function code() {
 		return
 	fi
 
-	# Sync built-in extensions
-	node build/lib/builtInExtensions.js
-
-	# Build
-	test -d out || yarn compile
-
 	ELECTRON_RUN_AS_NODE=1 \
 	NODE_ENV=development \
 	VSCODE_DEV=1 \

scripts/code.bat

@@ -5,26 +5,17 @@ title VSCode Dev
 
 pushd %~dp0\..
 
-:: Node modules
+:: Get electron, compile, built-in extensions
-if not exist node_modules call yarn
+if "%VSCODE_SKIP_PRELAUNCH%"=="" node build/lib/preLaunch.js
 
 for /f "tokens=2 delims=:," %%a in ('findstr /R /C:"\"nameShort\":.*" product.json') do set NAMESHORT=%%~a
 set NAMESHORT=%NAMESHORT: "=%
 set NAMESHORT=%NAMESHORT:"=%.exe
 set CODE=".build\electron\%NAMESHORT%"
 
-:: Get electron
-call yarn electron
-
 :: Manage built-in extensions
 if "%1"=="--builtin" goto builtin
 
-:: Sync built-in extensions
-node build\lib\builtInExtensions.js
-
-:: Build
-if not exist out yarn compile
-
 :: Configuration
 set NODE_ENV=development
 set VSCODE_DEV=1

scripts/code.sh

@@ -24,11 +24,10 @@ function code() {
 		CODE=".build/electron/$NAME"
 	fi
 
-	# Node modules
+	# Get electron, compile, built-in extensions
-	test -d node_modules || yarn
+	if [[ -z "${VSCODE_SKIP_PRELAUNCH}" ]]; then
-
+		node build/lib/preLaunch.js
-	# Get electron
+	fi
-	yarn electron
 
 	# Manage built-in extensions
 	if [[ "$1" == "--builtin" ]]; then
@@ -36,12 +35,6 @@ function code() {
 		return
 	fi
 
-	# Sync built-in extensions
-	node build/lib/builtInExtensions.js
-
-	# Build
-	test -d out || yarn compile
-
 	# Configuration
 	export NODE_ENV=development
 	export VSCODE_DEV=1