Convert extension webpack scripts to modules

extensions/emmet/extension.webpack.config.js

@@ -2,22 +2,18 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
+// @ts-check
+import path from 'path';
 
-//@ts-check
+import withDefaults from '../shared.webpack.config.mjs';
 
-'use strict';
-
-const path = require('path');
-
-const withDefaults = require('../shared.webpack.config');
-
-module.exports = withDefaults({
-	context: __dirname,
+export default withDefaults({
+	context: import.meta.dirname,
 	entry: {
 		extension: './src/node/emmetNodeMain.ts',
 	},
 	output: {
-		path: path.join(__dirname, 'dist', 'node'),
+		path: path.join(import.meta.dirname, 'dist', 'node'),
 		filename: 'emmetNodeMain.js'
 	}
 });