Property 'GoogleAuthProvider' does not exist on type 'Auth'.ts(2339)

Question

In my auth.service.ts, when I add sign in with google, it gave me an error saying that Property 'GoogleAuthProvider' does not exist on type 'Auth'. ts(2339).

This is the code written in auth.service.ts:

import { Injectable } from '@angular/core';
import { first } from 'rxjs/operators';
import { Auth } from '@angular/fire/auth';

@Injectable({
  providedIn: 'root'
})
export class AuthService {

  constructor(private afAuth: Auth) { }

  googleSignIn() {
    const provider = new this.afAuth.GoogleAuthProvider();
    return this.oAuthLogin(provider);
  }

  async getUser() {
    return this.afAuth.authState.pipe(first()).toPromise();
  }
}