Firebase.js - Mention Chat App

firebase.js

import firebase from "firebase";
import "firebase/storage";

const firebaseConfig = {
  apiKey: `${process.env.REACT_APP_FIREBASE_API_KEY}`,
  authDomain: `${process.env.REACT_APP_FIREBASE_AUTH_DOMAIN}`,
  databaseURL: `${process.env.REACT_APP_FIREBASE_DATABASE_URL}`,
  projectId: `${process.env.REACT_APP_FIREBASE_PROJECT_ID}`,
  storageBucket: `${process.env.REACT_APP_FIREBASE_STORAGE_BUCKET}`,
  messagingSenderId: `${process.env.REACT_APP_FIREABSE_MESSAGING_SENDER_ID}`,
  appId: `${process.env.REACT_APP_FIREBASE_APP_ID}`,
};

const app = !firebase.apps.length
  ? firebase.initializeApp(firebaseConfig)
  : firebase.app();
const realTimeDb = app.database();
const db = app.firestore();
const auth = app.auth();
const storage = firebase.storage();

export { auth, db, storage, realTimeDb };