javascript - “用户”不可分配给类型 'void'

Question

我已经被 Ionic 4 和 Firestore 困住了几个月。有一次我去了 Firestore 和 Ionic 4，很多东西都坏了，所以我从头开始。我正在关注适用于 iOS 和 Android 的 AngularFirebase Ionic Google Login Youtube 教程，但收到以下错误:

[ng] src/app/pages/login/login.page.ts(35,7) 中出现错误:错误 TS2322:类型“User”无法分配给类型“void”。

我使用与教程中完全相同的代码，但不确定为什么会收到此错误。

    import { Component, OnInit } from '@angular/core';
    import * as firebase from 'firebase/app';
    import { AngularFireAuth } from 'angularfire2/auth';
    import { Observable, of } from 'rxjs';
    import { GooglePlus } from '@ionic-native/google-plus/ngx';
    import { environment } from '../../../environments/environment';

@Component({
  selector: 'app-login',
  templateUrl: './login.page.html',
  styleUrls: ['./login.page.scss'],
})
export class LoginPage  {

  user: Observable<firebase.User>;

  constructor(private afAuth: AngularFireAuth,
               private gplus: GooglePlus) {

        this.user = this.afAuth.authState;
      }
  googleLogin() {
    this.nativeGoogleLogin();
  }

    async nativeGoogleLogin(): Promise<void> {
      try {

      const gplusUser = await this.gplus.login({
        'webClientId': environment.googleWebClientId,
        'offline': true,
        'scopes': 'profile email'
      });

           return await this.afAuth.auth.signInWithCredential(
         firebase.auth.GithubAuthProvider.credential(gplusUser.idToken)
      );

          } catch (err) {
              console.log(err);
          }
        }
      }

Answer 1

signInWithCredential返回 firebase.User对象，因此您可以将函数的返回类型更改为 Promise<firebase.User> .

async nativeGoogleLogin(): Promise<firebase.User> {
      try {

      const gplusUser = await this.gplus.login({
        'webClientId': environment.googleWebClientId,
        'offline': true,
        'scopes': 'profile email'
      });

           return await this.afAuth.auth.signInWithCredential(
         firebase.auth.GithubAuthProvider.credential(gplusUser.idToken)
      );

          } catch (err) {
              console.log(err);
          }
        }
      }