Avoid using `monaco` in `.d.ts` file

src/monaco.d.ts

@@ -147,6 +147,6 @@ declare module monaco.languages.typescript {
     export var typescriptDefaults: LanguageServiceDefaults;
     export var javascriptDefaults: LanguageServiceDefaults;
 
-    export var getTypeScriptWorker: () => monaco.Promise<any>;
-    export var getJavaScriptWorker: () => monaco.Promise<any>;
+    export var getTypeScriptWorker: () => Promise<any>;
+    export var getJavaScriptWorker: () => Promise<any>;
 }