Uncaught (in promise): Error: No provider for AngularFireAuth

Question

We are tried login with google authentication using (Firebase/ionic2/angularjs2).Our code

 import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { Observable } from 'rxjs/Observable';
import { AngularFireAuth } from 'angularfire2/auth';
import * as firebase from 'firebase/app';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
   user: Observable<firebase.User>;
  constructor(public navCtrl: NavController,public afAuth: AngularFireAuth) {
    this.user = afAuth.authState;
  }
  login() {
    this.afAuth.auth.signInWithPopup(new firebase.auth.GoogleAuthProvider());
  }

  logout() {
    this.afAuth.auth.signOut();
  }
}

but we are getting error :

Error: Uncaught (in promise): Error: No provider for AngularFireAuth!
Error: No provider for AngularFireAuth!

Please guide to us what working in our code .

Answer 1

A clarification of what @rmalviya suggested, I assume you are currently on Ionic version 3.x.x, for this version you have two ways of importing a native plugin and adding the respective providers for the plugin.

1) You could add the provider in your current page typescript file. like so:

  import { AngularFireAuth } from 'angularfire2/auth';

  ...

  @Component({
    selector: 'page-home',
    templateUrl: 'home.html',
    providers: [AngularFireAuth]
  })

2) Second method you could import it in your app.modules.ts and add the plugin into the providers

 import { AngularFireAuth } from 'angularfire2/auth';

 ...

 providers: [
   StatusBar,
   SplashScreen,
   {provide: ErrorHandler, useClass: IonicErrorHandler},
   AngularFireAuth
 ]