change the following firebase v8 code into firebase v9: in javascript

// v8
import firebase from 'firebase/app';
import 'firebase/auth';
import 'firebase/firestore';

firebase.initializeApp(config);
const auth = firebase.auth();
const firestore = firebase.firestore();

// v9
import { initializeApp } from 'firebase/app';
import { getAuth } from 'firebase/auth';
import { getFirestore } from 'firebase/firestore';

const app = initializeApp(config);
const auth = getAuth(app);
const firestore = getFirestore(app);
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