Add check that the editor's ESM JS files can be loaded in a browser

test/monaco/esm-check/index.js

@@ -0,0 +1,10 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as monaco from './out/vs/editor/editor.main.js';
+
+monaco.editor.create(document.getElementById('container'), {
+	value: 'Hello world'
+});