Convert extension webpack scripts to modules

extensions/github/extension.webpack.config.js

@@ -0,0 +1,23 @@
+/*---------------------------------------------------------------------------------------------
+ *  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 withDefaults from '../shared.webpack.config.mjs';
+
+export default withDefaults({
+	context: import.meta.dirname,
+	entry: {
+		extension: './src/extension.ts'
+	},
+	output: {
+		libraryTarget: 'module',
+		chunkFormat: 'module',
+	},
+	externals: {
+		'vscode': 'module vscode',
+	},
+	experiments: {
+		outputModule: true
+	}
+});