Answers for "importing firebase in v9"

import firebase v9

import { initializeApp } from 'firebase/app';
import { getFirestore, collection, getDocs } from 'firebase/firestore';
import { getAuth, onAuthStateChanged } from 'firebase/auth';
import { getStorage, uploadBytes } from 'firebase/storage';
import { getRemoteConfig, fetchAndActivate } from 'firebase/remote-config';
import { getRemoteConfig, fetchAndActivate } from 'firebase/remote-config';
import { getDatabase, ref, get } from 'firebase/database';
import { getMessaging, getToken } from 'firebase/messaging';
import { getPerformance } from 'firebase/performance';
import { getAnalytics, logEvent } from 'firebase/analytics';

firebase v9 import

// v9 compat packages are API compatible with v8 code
import firebase from 'firebase/compat/app';
import 'firebase/compat/auth';import 'firebase/compat/firestore';