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import { AngularFire, FirebaseListObservable } from 'angularfire2';

From

Cover of Mobile App Development with Ionic 2, 1st Edition

Note

import { AngularFireModule } from 'angularfire2'; import { AngularFireDatabaseModule, AngularFireDatabase, FirebaseListObservable } from 'angularfire2/database'; import { AngularFireAuthModule, AngularFireAuth } from 'angularfire2/auth';