[AngularFire2] Auth with Firebase auth -- email

  login(email, password) {

    return this.fromFirebaseAuthPromise(this.auth$.login({
      email, password
    },{
      method: AuthMethods.Password,
      provider: AuthProviders.Password
    }));
  }

  fromFirebaseAuthPromise(promise) {
    const subject = new Subject<any>();

    promise.then((res) => {
      subject.next(res);
      subject.complete();
    }, err => {
      subject.error(err);
      subject.complete();
    });

    return subject.asObservable();
  }

  login(){
    const formValue = this.form.value;

    this.authService.login(formValue.email, formValue.password)
      .subscribe((res) => {
         this.router.navigate(['/home']);
      })
  }