add javascript worker

frontend/src/lib/components/SimpleEditor.svelte

@@ -20,6 +20,7 @@
 
 	import editorWorker from 'monaco-editor/esm/vs/editor/editor.worker?worker'
 	import jsonWorker from 'monaco-editor/esm/vs/language/json/json.worker?worker'
+	import tsWorker from 'monaco-editor/esm/vs/language/typescript/ts.worker?worker'
 
 	import { buildWorkerDefinition } from 'monaco-editor-workers'
 
@@ -56,6 +57,8 @@
 				getWorker: function (_moduleId: any, label: string) {
 					if (label === 'json') {
 						return new jsonWorker()
+					} else if (label === 'typescript' || label === 'javascript') {
+						return new tsWorker()
 					} else {
 						return new editorWorker()
 					}