monaco-editor/samples/electron-esm-webpack/index.js

import * as monaco from 'monaco-editor';

self.MonacoEnvironment = {
	getWorkerUrl: function (moduleId, label) {
		if (label === 'json') {
			return './json.worker.bundle.js';
		}
		if (label === 'css' || label === 'scss' || label === 'less') {
			return './css.worker.bundle.js';
		}
		if (label === 'html' || label === 'handlebars' || label === 'razor') {
			return './html.worker.bundle.js';
		}
		if (label === 'typescript' || label === 'javascript') {
			return './ts.worker.bundle.js';
		}
		return './editor.worker.bundle.js';
	}
};

monaco.editor.create(document.getElementById('container'), {
	value: ['function x() {', '\tconsole.log("Hello world!");', '}'].join('\n'),
	language: 'javascript'
});