Warning: It looks like you're using the development build of the Firebase JS SDK

I've integrated Firebase into my React.js app as such: https://firebase.google.com/docs/database/web/start

import firebase from 'firebase'

var config = {
  apiKey: "####",
  authDomain: "#",
  databaseURL: "#",
  projectId: "#",
  storageBucket: "#",
  messagingSenderId: "#"
};
var fire = firebase.initializeApp(config);
export default fire;

import fire from './fire';

class App extends Component {
    componentWillMount(){
        let messagesRef = fire.database().ref('messages').orderByKey().limitToLast(100);
    }
}

But now I'm getting this warning in the console:

It looks like you're using the development build of the Firebase JS SDK. When deploying Firebase apps to production, it is advisable to only import the individual SDK components you intend to use.

For the module builds, these are available in the following manner (replace with the name of a component - i.e. auth, database, etc):

CommonJS Modules: const firebase = require('firebase/app'); require('firebase/');

ES Modules: import firebase from 'firebase/app'; import 'firebase/';

How do I fix this warning?

I have tried (in fire.js) changing this:

import firebase from 'firebase'

To this:

import firebase from 'firebase/app'

That results in this error:

The proper way to import firebase is as such:

import firebase from 'firebase/app';
import 'firebase/database'; // If using Firebase database
import 'firebase/storage';  // If using Firebase storage

The proper way to import firebase and getting rid of the warnings is:

Always import this way

import firebase from 'firebase/app';

Then import each sub-modules (each firebase service) as needed

import 'firebase/auth';        // for authentication
import 'firebase/storage';     // for storage
import 'firebase/database';    // for realtime database
import 'firebase/firestore';   // for cloud firestore
import 'firebase/messaging';   // for cloud messaging
import 'firebase/functions';   // for cloud functions