VScode 上 Firebase 的自动完成

Question

Installed VScode and package for javascript. I'm writing code with firebase like below. I was using Xcode and it autocomplete worked well but VScode doesn't. How can I fix it?

var firebaseConfig = {
  ...
};
// Initialize Firebase
firebase.initializeApp(firebaseConfig);

var db = firebase.firestore();
db.collection("test")...

What I did
Installed Firebase Snippets but it was not perfect.

Answer 1

I am using Visual Studio IntelliCode extension.