Copy webServer from Typescript to VS Code (#165771)

* Initial draft.

Not working.
Also not correctly formatted, I'll do that later.

* Various fixes

It works now

* A bit of cleanup

* Move webServer to its own directory

And prepare for getting rid of dynamicImportCompat.js hack

* Remove dynamicImportCompat.js hack

* Revert unrelated change

* Webpac tsserver.web.js with webServer.ts as entrypoint

Instead of using CopyPlugin.

1. Shipping multiple entrypoints in a single file required fixes to
build code.
2. There are a couple of warnings from `require` calls in
tsserverlibrary.js. Those are not relevant since they're in non-web
code, but I haven't figured how to turn them off; they are fully dynamic
so `externals` didn't work.

* Ignore warnings from dynamic import in tsserver

* Add to .vscodeignore files

build/gulpfile.extensions.js

@@ -64,6 +64,7 @@ const compilations = [
 	'references-view/tsconfig.json',
 	'simple-browser/tsconfig.json',
 	'typescript-language-features/test-workspace/tsconfig.json',
+	'typescript-language-features/web/tsconfig.json',
 	'typescript-language-features/tsconfig.json',
 	'vscode-api-tests/tsconfig.json',
 	'vscode-colorize-tests/tsconfig.json',

build/lib/extensions.js

@@ -414,19 +414,14 @@ async function webpackExtensions(taskName, isWatch, webpackConfigLocations) {
     const webpackConfigs = [];
     for (const { configPath, outputRoot } of webpackConfigLocations) {
         const configOrFnOrArray = require(configPath);
-        function addConfig(configOrFn) {
-            let config;
-            if (typeof configOrFn === 'function') {
-                config = configOrFn({}, {});
+        function addConfig(configOrFnOrArray) {
+            for (const configOrFn of Array.isArray(configOrFnOrArray) ? configOrFnOrArray : [configOrFnOrArray]) {
+                const config = typeof configOrFn === 'function' ? configOrFn({}, {}) : configOrFn;
+                if (outputRoot) {
+                    config.output.path = path.join(outputRoot, path.relative(path.dirname(configPath), config.output.path));
+                }
                 webpackConfigs.push(config);
             }
-            else {
-                config = configOrFn;
-            }
-            if (outputRoot) {
-                config.output.path = path.join(outputRoot, path.relative(path.dirname(configPath), config.output.path));
-            }
-            webpackConfigs.push(configOrFn);
         }
         addConfig(configOrFnOrArray);
     }

build/lib/extensions.ts

@@ -506,20 +506,14 @@ export async function webpackExtensions(taskName: string, isWatch: boolean, webp
 
 	for (const { configPath, outputRoot } of webpackConfigLocations) {
 		const configOrFnOrArray = require(configPath);
-		function addConfig(configOrFn: webpack.Configuration | Function) {
-			let config;
-			if (typeof configOrFn === 'function') {
-				config = (configOrFn as Function)({}, {});
+		function addConfig(configOrFnOrArray: webpack.Configuration | ((env: unknown,args: unknown) => webpack.Configuration) | webpack.Configuration[]) {
+			for (const configOrFn of Array.isArray(configOrFnOrArray) ? configOrFnOrArray : [configOrFnOrArray]) {
+				const config = typeof configOrFn === 'function' ? configOrFn({}, {}) : configOrFn;
+				if (outputRoot) {
+					config.output!.path = path.join(outputRoot, path.relative(path.dirname(configPath), config.output!.path!));
+				}
 				webpackConfigs.push(config);
-			} else {
-				config = configOrFn;
 			}
-
-			if (outputRoot) {
-				config.output.path = path.join(outputRoot, path.relative(path.dirname(configPath), config.output.path));
-			}
-
-			webpackConfigs.push(configOrFn);
 		}
 		addConfig(configOrFnOrArray);
 	}

extensions/.vscodeignore

@@ -0,0 +1,3 @@
+node_modules/typescript/lib/tsc.js
+node_modules/typescript/lib/typescriptServices.js
+node_modules/typescript/lib/tsserverlibrary.js

extensions/postinstall.mjs

@@ -26,7 +26,6 @@ function processRoot() {
 function processLib() {
 	const toDelete = new Set([
 		'tsc.js',
-		'tsserverlibrary.js',
 		'typescriptServices.js',
 	]);
 

extensions/typescript-language-features/.vscodeignore

@@ -1,5 +1,6 @@
 build/**
 src/**
+web/**
 test/**
 test-workspace/**
 out/**

extensions/typescript-language-features/extension-browser.webpack.config.js

@@ -7,8 +7,6 @@
 
 'use strict';
 const CopyPlugin = require('copy-webpack-plugin');
-const Terser = require('terser');
-const fs = require('fs');
 const path = require('path');
 
 const defaultConfig = require('../shared.webpack.config');
@@ -30,8 +28,7 @@ const languages = [
 	'tr',
 	'zh-cn',
 ];
-
-module.exports = withBrowserDefaults({
+module.exports = [withBrowserDefaults({
 	context: __dirname,
 	entry: {
 		extension: './src/extension.browser.ts',
@@ -60,30 +57,21 @@ module.exports = withBrowserDefaults({
 				}))
 			],
 		}),
-		// @ts-ignore
-		new CopyPlugin({
-			patterns: [
-				{
-					from: '../node_modules/typescript/lib/tsserver.js',
-					to: 'typescript/tsserver.web.js',
-					transform: async (content) => {
-						const dynamicImportCompatPath = path.join(__dirname, '..', 'node_modules', 'typescript', 'lib', 'dynamicImportCompat.js');
-						const prefix = fs.existsSync(dynamicImportCompatPath) ? fs.readFileSync(dynamicImportCompatPath) : undefined;
-						const output = await Terser.minify(content.toString());
-						if (!output.code) {
-							throw new Error('Terser returned undefined code');
-						}
-
-						if (prefix) {
-							return prefix.toString() + '\n' + output.code;
-						}
-						return output.code;
-					},
-					transformPath: (targetPath) => {
-						return targetPath.replace('tsserver.js', 'tsserver.web.js');
-					}
-				}
-			],
-		}),
 	],
-});
+}), withBrowserDefaults({
+	context: __dirname,
+	entry: {
+		'typescript/tsserver.web': './web/webServer.ts'
+	},
+	ignoreWarnings:  [/Critical dependency: the request of a dependency is an expression/],
+	output: {
+		// all output goes into `dist`.
+		// packaging depends on that and this must always be like it
+		filename: '[name].js',
+		path: path.join(__dirname, 'dist', 'browser'),
+		libraryTarget: undefined,
+	},
+	externals: {
+		'perf_hooks': 'commonjs perf_hooks',
+	}
+})];

extensions/typescript-language-features/web/tsconfig.json

@@ -0,0 +1,15 @@
+{
+	"extends": "../../tsconfig.base.json",
+	"compilerOptions": {
+		"outDir": "../../out",
+		"module": "nodenext",
+		"moduleDetection": "legacy",
+		"experimentalDecorators": true,
+		"types": [
+			"node"
+		]
+	},
+	"files": [
+		"webServer.ts"
+	]
+}