firebase.initializeApp is not a function - reactjs

Question

I'm trying to make a site in React, and I have added the Firebase library using npm i firebase --save
I am then trying to call this in my app, but I am not having much joy:
import * as firebase from "firebase";
const instance = firebase.initializeApp({
apiKey: '123',
authDomain: 'https://123.firebaseapp.com/',
databaseURL: 'https://123.firebaseio.com/'
});
export default instance;
No matter what I try, it throws:
firebase.initializeApp is not a function
I've checked its in my node_modules and i've reinstalled it, but I still have no such luck.
Any suggestions?

Answer 1

I had a the same problem with firestore in my Vue application.
I eventually came right by doing the following in my firebase.js file:
import { firebase } from '#firebase/app'
As opposed to :
import * as firebase from 'firebase/app'
Also if you are using any specific firebase modules you need to import them individually like so:
import '#firebase/auth'
import '#firebase/firestore'
const db = firebase.firestore()
const auth = firebase.auth()
export { db, auth }
Hope this helps somebody.

Answer 2

This is how I solved this
import firebase from "firebase";
const firebaseConfig = {
apiKey: "Api Key",
authDomain: "Domain",
databaseURL: "URL",
projectId: "ID",
};
const firebaseApp = firebase.initializeApp(firebaseConfig);
const db = firebaseApp.firestore();
export default db;

Answer 3

Can you please try with:
var firebase = require('firebase/app');
Credits.

Answer 4

Been having a similar issue with firebase v4.12.1 throwing error of initializeApp not being a function. I solved it by switching to using #firebase/app 0.1.10 npm package instead.
import { firebase } from '#firebase/app';
Using it in a next.js v5.1.0 project.

Answer 5

been having the same problem but in VUE, in case it works i solved importing each element separately
// This import loads the firebase namespace.
import firebase from 'firebase/app';
// These imports load individual services into the firebase namespace.
import 'firebase/auth';
import 'firebase/database';
import 'firebase/firestore';
import 'firebase/storage';
Hope can help ;)

Answer 6

This is the new firebase SKD modular recommendation. Avoid using the
import firebase from 'firebase/app';
and try to use modular import, such as:
import {initializeApp} from "firebase/app";
const instance = {
apiKey: '123',
authDomain: 'https://123.firebaseapp.com/',
databaseURL: 'https://123.firebaseio.com/'
};
export const app = initializeApp(instance);
references
https://firebase.google.com/docs/web/learn-more#modular-version

Answer 7

const auth = firebase.auth()
export { db, auth }`import * as firebase from "firebase";
require("#firebase/firestore");
// For Firebase JS SDK v7.20.0 and later, measurementId is optional
const firebaseConfig = {
apiKey: "",
authDomain: "",
projectId: "",
storageBucket: "",
messagingSenderId: "",
appId: "",
measurementId: ""
};
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
export default firebase.firestore();