Assistance With TS2570 Error: Property 'sendEmailVerification' does not exist on type 'Promise<User>'. Did you forget to use 'await'?

Issue

I am trying to set up Firebase on my Ionic Angular project. I am using the linked tutorial https://www.positronx.io/ionic-firebase-authentication-tutorial-with-examples/ to do this.

I keep getting a TS2570 error:

Property 'sendEmailVerification' does not exist on type 'Promise'. Did you forget to use 'await'?

I have attached my code. The only major thing I changed was that AngularFire changed the way auth is used in 6.0.0

import { Injectable, NgZone } from '@angular/core';
import { auth } from 'firebase/app';
import { User } from "./user";
import { Router } from "@angular/router";
import { AngularFireAuth } from "@angular/fire/auth";
import { AngularFirestore, AngularFirestoreDocument } from '@angular/fire/firestore';

@Injectable({
  providedIn: 'root'
})

export class AuthenticationService {
  userData: any;

  constructor(
    public afStore: AngularFirestore,
    public ngFireAuth: AngularFireAuth,
    public router: Router,
    public ngZone: NgZone
  ) {
    this.ngFireAuth.authState.subscribe(user => {
      if (user) {
        this.userData = user;
        localStorage.setItem('user', JSON.stringify(this.userData));
        JSON.parse(localStorage.getItem('user'));
      } else {
        localStorage.setItem('user', null);
        JSON.parse(localStorage.getItem('user'));
      }
    })
  }

  // Login in with email/password
  SignIn(email, password) {
    return this.ngFireAuth.signInWithEmailAndPassword(email, password)
  }

  // Register user with email/password
  RegisterUser(email, password) {
    return this.ngFireAuth.createUserWithEmailAndPassword(email, password)
  }

  // Email verification when new user register
  SendVerificationMail() {
      return this.ngFireAuth.currentUser.sendEmailVerification()
      .then(() => {
        this.router.navigate(['verify-email']);
      })
    }

  // Recover password
  PasswordRecover(passwordResetEmail) {
    return this.ngFireAuth.sendPasswordResetEmail(passwordResetEmail)
    .then(() => {
      window.alert('Password reset email has been sent, please check your inbox.');
    }).catch((error) => {
      window.alert(error)
    })
  }

  // Returns true when user is looged in
  get isLoggedIn(): boolean {
    const user = JSON.parse(localStorage.getItem('user'));
    return (user !== null && user.emailVerified !== false) ? true : false;
  }

  // Returns true when user's email is verified
  get isEmailVerified(): boolean {
    const user = JSON.parse(localStorage.getItem('user'));
    return (user.emailVerified !== false) ? true : false;
  }

  // Sign in with Gmail
  GoogleAuth() {
    return this.AuthLogin(new auth.GoogleAuthProvider());
  }

  // Auth providers
  AuthLogin(provider) {
    return this.ngFireAuth.signInWithPopup(provider)
    .then((result) => {
       this.ngZone.run(() => {
          this.router.navigate(['dashboard']);
        })
      this.SetUserData(result.user);
    }).catch((error) => {
      window.alert(error)
    })
  }

  // Store user in localStorage
  SetUserData(user) {
    const userRef: AngularFirestoreDocument<any> = this.afStore.doc(`users/${user.uid}`);
    const userData: User = {
      uid: user.uid,
      email: user.email,
      displayName: user.displayName,
      photoURL: user.photoURL,
      emailVerified: user.emailVerified
    }
    return userRef.set(userData, {
      merge: true
    })
  }

  // Sign-out
  SignOut() {
    return this.ngFireAuth.signOut().then(() => {
      localStorage.removeItem('user');
      this.router.navigate(['login']);
    })
  }

}

The only time it's called is in the registration pages here

signUp(email, password){
        this.authService.RegisterUser(email.value, password.value)
        .then((res) => {
          // Do something here
          this.authService.SendVerificationMail()
          this.router.navigate(['verify-email']);
        }).catch((error) => {
          window.alert(error.message)
        })
    }

}

These are the dependancies used in the project:

    "@angular/common": "~8.2.14",
    "@angular/core": "~8.2.14",
    "@angular/fire": "^6.0.0",
    "@angular/forms": "~8.2.14",
    "@angular/platform-browser": "~8.2.14",
    "@angular/platform-browser-dynamic": "~8.2.14",
    "@angular/router": "~8.2.14",
    "@capacitor/cli": "^2.0.1",
    "@capacitor/core": "^2.0.1",
    "@capacitor/ios": "^2.0.1",
    "@ionic-native/core": "^5.0.7",
    "@ionic-native/splash-screen": "^5.0.0",
    "@ionic-native/status-bar": "^5.0.0",
    "@ionic/angular": "^5.0.0",
    "core-js": "^2.5.4",
    "firebase": "^7.14.0",
    "rxjs": "~6.5.1",
    "tslib": "^1.9.0",
    "zone.js": "~0.9.1"

If anyone can give me any tips on how to fix this issue? I am not 100% sure on how to implement the async and await on the function without showing more errors.

Solution

The new version AngularFire 6.0.0 is released to support Angular 9. It is not backwards compatible with older versions. It no longer supports older versions of Angular (<9). It also dropped support for older versions of Typescript(<3.6.4), Firebase Javascript SDK (<7.13.1) and firebase-tools(<8.0.0).

'auth' property of AngularFireAuth is deprecated therefore the usage of 'currentUser' has also been changed.

'currentUser' is a promise that resolves the current user. Property 'sendEmailVerification' does not exist on it but can be easily accessed through the resolved user.

  // Email verification when new user register
  SendVerificationMail() {
    return this.ngFireAuth.currentUser.then(u => u.sendEmailVerification())
    .then(() => {
      this.router.navigate(['verify-email']);
    })
  }

Answered By - cerkiner