angularfire: angularfire2: upgrade: Property 'database' does not exist on type 'AngularFireDatabase'

Version info

Angular: angular/cli: ^1.4.2

Firebase: ^4.3.1

AngularFire: ^4.0.0-rc.2

How to reproduce these conditions

Steps to set up and reproduce After upgrading my packages, the line: this.db.database.ref throws the error: Property ‘database’ does not exist on type ‘AngularFireDatabase’.

Have looked at https://github.com/angular/angularfire2/blob/master/docs/version-4-upgrade.md but when I change the line to this.db.ref it’s also not valid as: Property ‘ref’ does not exist on type ‘AngularFireDatabase’.

import * as firebase from 'firebase/app';
import { AngularFireAuth } from 'angularfire2/auth';
import { AngularFireDatabase } from 'angularfire2/database';


@Injectable()
export class AuthService {

  constructor(
    private db: AngularFireDatabase,
    private dbAuth: AngularFireAuth,
  ) {}

  getUser(email) {
    return this.db.database.ref(keys.database.tempUser)
      .orderByChild('email')
      .equalTo(email)
      .limitToFirst(1)
      .once('child_added', (data) => {
        this.setLocalData(keys.localStorage.userIdTemp, data.key);
      });
  }
}

Debug output

Errors in the JavaScript console Property ‘database’ does not exist on type ‘AngularFireDatabase’.