小编Hri*_*its的帖子

import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { User } from './../classes/user';
import { AlertService } from './alert.service';
import { Alert } from './../classes/alert';
import { AlertType } from './../enums/alert-type.enum';
import { Observable } from 'rxjs';
import 'rxjs/add/Observable/of';
import { AngularFireAuth } from 'angularfire2/auth';
import { AngularFirestore, AngularFirestoreDocument } from 'angularfire2/firestore';
import 'rxjs/add/operator/switchMap';
import { from } from 'rxjs';
import 'rxjs/add/observable/fromPromise';
import { AngularFireAuthModule } from 'angularfire2/auth';


@Injectable({
  providedIn: 'root'

})
export class AuthService …