Added mangling loader for ts files in extensions

extensions/mangle-loader.js

@@ -0,0 +1,34 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+// @ts-check
+
+const webpack = require('webpack');
+const { Mangler } = require('../build/lib/mangleTypeScript');
+
+let map;
+/**
+ * @param {string} projectPath
+ */
+function getMangledFileContents(projectPath) {
+	if (!map) {
+		const ts2tsMangler = new Mangler(projectPath, console.log);
+		map = ts2tsMangler.computeNewFileContents();
+	}
+
+	return map;
+}
+
+/**
+ * @type {webpack.LoaderDefinitionFunction}
+ */
+module.exports = async function (source, sourceMap, meta) {
+	const options = this.getOptions();
+	const callback = this.async();
+
+	const fileContentsMap = getMangledFileContents(options.configFile);
+
+	const newContents = fileContentsMap.get(this.resourcePath);
+	callback(null, newContents ?? source, sourceMap, meta);
+};