firebase.firestore() is not a function when trying to initialize Cloud Firestore

Question

When I try to initialize Firebase Cloud Firestore, I ran into the following error:

Uncaught TypeError: WEBPACK_IMPORTED_MODULE_0_firebase.firestore is not a function

I installed firebase with npm install firebase --save previously.

import * as firebase from 'firebase'; import router from '../router';  const config = {         apiKey: "a",         authDomain: "a",         databaseURL: "a",         projectId: "a",         storageBucket: "a",         messagingSenderId: "a" }; if(!firebase.apps.length){   firebase.initializeApp(config);   let firestore = firebase.firestore(); } 

Answer 1

I fixed it by importing multiple libraries: firebase and firebase/firestore. That's because the firebase core library does not include the firestore library.

import firebase from 'firebase/app'; import 'firebase/firestore';