Firebase.js Initialization

 // Import the functions you need from the SDKs you need

import { initializeApp, getApps, getApp } from "firebase/app";

import { getFirestore } from "firebase/firestore";

import { getAuth } from "firebase/auth";

// TODO: Add SDKs for Firebase products that you want to use

// https://firebase.google.com/docs/web/setup#available-libraries

// Your web app's Firebase configuration

const firebaseConfig = {

  apiKey: "AIzaSyBmKKLxIit2n1hblRUj6o7myg6h0aw-Zxc",

  authDomain: "whatsapp-by-hemant.firebaseapp.com",

  projectId: "whatsapp-by-hemant",

  storageBucket: "whatsapp-by-hemant.appspot.com",

  messagingSenderId: "847061055256",

  appId: "1:847061055256:web:8a084f0218d7ded0d5106d"

};

// Initialize Firebase

const firebaseApp = !getApps().length

        ? initializeApp(firebaseConfig)

        : getApp();

const db = getFirestore(firebaseApp);

const auth = getAuth(firebaseApp);

// For loading previous app data if available

const createFirebaseApp = (config = {}) => {
  try {
    return getApp();
  } catch () {
    return initializeApp(config);
  }
};

const firebaseApp = createFirebaseApp({/* your config */})