import firebase from 'firebase';
var config = {
  apiKey: 'XYZ',
  authDomain: 'myAuthDomain.firebaseapp.com',
  databaseURL: 'https://myDBURL.firebaseio.com',
  storageBucket: 'project-xyz.appspot.com',
  ...
};
firebase.initializeApp(config);
export const firebaseAuth = firebase.auth;
export const storage = firebase.storage();
export const db = firebase.firestore();