https://github.com/angular/angularfire
https://github.com/angular/angularfire/blob/master/docs/install-and-setup.md
ionic start appName blank
ionic serve
npm install @angular/cli
src>environment>environment.ts: firebase settings add (firebase: {...})
src>app>app.module.ts:
import { AngularFireModule } from '@angular/fire';
import { AngularFireDatabaseModule } from '@angular/fire/database';
import { AngularFireAuthModule } from '@angular/fire/auth';
import { environment } from '../environments/environment';
import { AngularFirestoreModule } from '@angular/fire/firestore';
imports add;
AngularFireModule.initializeApp(environment.firebase),
AngularFirestoreModule,
AngularFireDatabaseModule,
AngularFireAuthModule
ionic g: service (name: firestore)
src>firestore.service.ts:
import { AngularFirestore } from '@angular/fire/firestore';
import { AngularFireAuth } from '@angular/fire/auth';
imports add;
private firestore: AngularFirestore, public firebaseAuth: AngularFireAuth