all: bundle with esbuild instead of webpack

Bundling with esbuild is considerably faster than with webpack: on my
PC, webpack takes ~8.5 seconds and esbuild takes ~50 milliseconds.

Fixes golang/vscode-go#1705

Change-Id: If3df213195fb56f652a09135ef5f8b438060f16a
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/343791
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
Trust: Hyang-Ah Hana Kim <hyangah@gmail.com>
Trust: Suzy Mueller <suzmue@golang.org>

.vscode/extensions.json

@@ -0,0 +1,3 @@
+{
+	"recommendations": ["connor4312.esbuild-problem-matchers"]
+}

.vscode/launch.json

@@ -25,7 +25,7 @@
 			"stopOnEntry": false,
 			"sourceMaps": true,
 			"smartStep": true,
-			"preLaunchTask": "npm: webpack",
+			"preLaunchTask": "npm: bundle-dev",
 			"env": {
 				"VSCODE_GO_IN_TEST": ""  // Enable code
 			},
@@ -44,7 +44,7 @@
 			],
 			"sourceMaps": true,
 			"smartStep": true,
-			"preLaunchTask": "npm: webpack"
+			"preLaunchTask": "npm: bundle-dev"
 		},
 		{
 			"name": "Launch Extension Tests",

.vscode/tasks.json

@@ -50,6 +50,22 @@
 				"kind": "build",
 				"isDefault": true
 			}
+		},
+		{
+			"type": "npm",
+			"script": "bundle-watch",
+			"group": "build",
+			"problemMatcher": "$esbuild-watch",
+			"isBackground": true,
+			"presentation": {
+				"reveal": "never"
+			}
+		},
+		{
+			"type": "npm",
+			"script": "bundle-dev",
+			"group": "build",
+			"problemMatcher": "$esbuild",
 		}
 	]
 }

.vscodeignore

@@ -18,4 +18,3 @@ third_party/
 tools/
 tsconfig.json
 typings/
-webpack.config.js

package.json

@@ -35,10 +35,11 @@
   ],
   "scripts": {
     "vscode:prepublish": "npm run compile",
-    "webpack": "webpack --mode development",
-    "webpack-dev": "webpack --mode development --watch",
+    "bundle": "esbuild src/goMain.ts debugAdapter=src/debugAdapter/goDebug.ts --bundle --outdir=dist --external:vscode --format=cjs --platform=node",
+    "bundle-dev": "npm run bundle -- --sourcemap",
+    "bundle-watch": "npm run bundle -- --sourcemap --watch",
     "test-compile": "tsc -p ./",
-    "compile": "webpack --mode production",
+    "compile": "npm run bundle -- --minify",
     "watch": "tsc -watch -p ./",
     "test": "npm run test-compile && node ./out/test/runTest.js",
     "lint": "gts lint src test",
@@ -73,6 +74,7 @@
     "@types/sinon": "^9.0.0",
     "@types/vscode": "^1.59.0",
     "adm-zip": "^0.4.14",
+    "esbuild": "^0.12.21",
     "fs-extra": "^9.0.0",
     "get-port": "^5.1.1",
     "gts": "^3.1.0",
@@ -83,8 +85,6 @@
     "tslint": "^6.1.1",
     "typescript": "^3.8.3",
     "vscode-test": "^1.3.0",
-    "webpack": "^5.27.2",
-    "webpack-cli": "^4.5.0",
     "yarn": "^1.22.4"
   },
   "engines": {

webpack.config.js

@@ -1,47 +0,0 @@
-//@ts-check
-
-'use strict';
-
-const path = require('path');
-
-/**@type {import('webpack').Configuration}*/
-const config = {
-	target: 'node',
-	entry: {
-		goMain: './src/goMain.ts',
-		debugAdapter: './src/debugAdapter/goDebug.ts',
-	},
-	output: {
-		path: path.resolve(__dirname, 'dist'),
-		filename: '[name].js',
-		libraryTarget: 'commonjs2',
-		devtoolModuleFilenameTemplate: '../[resource-path]',
-		sourceMapFilename: '[name].js.map'
-	},
-	devtool: 'source-map',
-	externals: {
-		// the vscode-module is created on-the-fly and must be excluded.
-		vscode: 'commonjs vscode'
-	},
-	resolve: {
-		extensions: ['.ts', '.js']
-	},
-	module: {
-		rules: [
-			{
-				test: /\.ts$/,
-				exclude: /node_modules/,
-				use: [
-					{
-						loader: 'ts-loader'
-					}
-				]
-			}
-		]
-	},
-	optimization: {
-		// when this is true, the debugger breaks...
-		minimize: false
-	},
-};
-module.exports = config;