app/firebase/index.js

import firebase from 'firebase';

try {
    let config = {
        apiKey: process.env.API_KEY,
        authDomain: process.env.AUTH_DOMAIN,
        databaseURL: process.env.DATABASE_URL,
        projectId: process.env.PROJECT_ID,
        storageBucket: process.env.STORAGE_BUCKET,
        messagingSenderId: process.env.MESSAGING_SENDER_ID
    };

    firebase.initializeApp(config);
} catch (e) {}

// - Storage reference
export let storageRef = firebase.storage().ref();

// - Database authorize
export let firebaseAuth = firebase.auth;
export let firebaseRef = firebase.database().ref();

// - Firebase default
export default firebase;