在 Firebase 中，我收到 Uncaught TypeError: Cannot read property 'initializeApp' of undefined，但不确定为什么未定义“firebase”？

Question

here's my firebase import etc. in the config file, why would this be unable to recognise firebase?

import firebase from 'firebase/app'
import 'firebase/firestore'
import 'firebase/auth'

const firebaseConfig = {
  apiKey: "XXX",
  authDomain: "XXX",
  projectId: "XXX",
  storageBucket: "XXX",
  messagingSenderId: "XXX",
  appId: "XXX",
  measurementId: "XXX"
}

//init firebase
firebase.initializeApp(firebaseConfig)

const projectAuth = firebase.auth()
const projectFirestore = firebase.firestore()
const timestamp = firebase.firestore.FieldValue.serverTimestamp

export { projectAuth, projectFirestore, timestamp }

Answer 1

If you have installed version 9.0.0 then you would have to use compat libraries to use the namespaced version:

import firebase from 'firebase/compat/app'
import 'firebase/compat/firestore'
import 'firebase/compat/auth'

Although I'd recommend using the new Modular syntax which is designed to facilitate tree-shaking (removal of unused code) to make your web app as small and fast as possible.

import { initializeApp } from "firebase/app"
import { getAuth } from "firebase/auth";
import { getFirestore } from "firebase/firestore"

const app = initializeApp(firebaseConfig)

const projectAuth = getAuth(app)
const projectFirestore = getFirestore(app)

export { projectAuth, projectFirestore }

You can find detailed information in the documentation