Add esbuild script

Ref:
https://code.visualstudio.com/api/working-with-extensions/bundling-extension#run-esbuild

Author: walles

esbuild.js

@@ -0,0 +1,55 @@
+const esbuild = require('esbuild');
+
+const production = process.argv.includes('--production');
+const watch = process.argv.includes('--watch');
+
+async function main() {
+  const ctx = await esbuild.context({
+    entryPoints: ['src/extension.ts'],
+    bundle: true,
+    format: 'cjs',
+    minify: production,
+    sourcemap: !production,
+    sourcesContent: false,
+    platform: 'node',
+    outfile: 'dist/extension.js',
+    external: ['vscode'],
+    logLevel: 'warning',
+    plugins: [
+      /* add to the end of plugins array */
+      esbuildProblemMatcherPlugin
+    ]
+  });
+  if (watch) {
+    await ctx.watch();
+  } else {
+    await ctx.rebuild();
+    await ctx.dispose();
+  }
+}
+
+/**
+ * @type {import('esbuild').Plugin}
+ */
+const esbuildProblemMatcherPlugin = {
+  name: 'esbuild-problem-matcher',
+
+  setup(build) {
+    build.onStart(() => {
+      console.log('[watch] build started');
+    });
+    build.onEnd(result => {
+      result.errors.forEach(({ text, location }) => {
+        console.error(`✘ [ERROR] ${text}`);
+        if (location == null) return;
+        console.error(`    ${location.file}:${location.line}:${location.column}:`);
+      });
+      console.log('[watch] build finished');
+    });
+  }
+};
+
+main().catch(e => {
+  console.error(e);
+  process.exit(1);
+});

package.json

@@ -24,14 +24,17 @@
   "main": "./dist/extension",
   "scripts": {
     "compile": "webpack --mode development",
+    "check-types": "tsc --noEmit",
     "format": "prettier --config .prettierrc 'src/**/*.ts' --write",
     "lint": "eslint src --ext ts",
     "package": "webpack --mode production --devtool hidden-source-map",
     "publish": "vsce publish",
     "pretest": "npm run compile && npm run lint",
     "test": "vscode-tmgrammar-test -g tests/support/diff.tmLanguage.json tests/unit/*.test && node ./out/test/runTest.js",
     "vscode:prepublish": "npm run package",
-    "watch": "webpack --mode development --watch"
+    "watch": "webpack --mode development --watch",
+    "watch:tsc": "tsc --noEmit --watch --project tsconfig.json",
+    "watch:esbuild": "node esbuild.js --watch"
   },
   "scriptsComment": {
     "package": [
@@ -82,4 +85,4 @@
   "engines": {
     "vscode": "^1.103.0"
   }
-}
+}