fix: debounce reloadLanguageTools in monaco

closes vuejs#275 closes vuejs#263

Author: sxzz

src/monaco/env.ts

@@ -10,6 +10,7 @@ import type { CreateData } from './vue.worker'
 import vueWorker from './vue.worker?worker'
 import * as languageConfigs from './language-configs'
 import type { LanguageService } from '@vue/language-service'
+import { debounce } from '../utils'
 
 let initted = false
 export function initMonaco(store: Store) {
@@ -158,7 +159,12 @@ export function loadMonacoEnv(store: Store) {
   languages.setLanguageConfiguration('typescript', languageConfigs.ts)
   languages.setLanguageConfiguration('css', languageConfigs.css)
 
-  store.reloadLanguageTools = () => reloadLanguageTools(store)
+  let languageToolsPromise: Promise<void> | undefined
+  store.reloadLanguageTools = debounce(async () => {
+    ;(languageToolsPromise ||= reloadLanguageTools(store)).finally(() => {
+      languageToolsPromise = undefined
+    })
+  }, 250)
   languages.onLanguage('vue', () => store.reloadLanguageTools!())
 
   // Support for go to definition