SignInWithApple is not defined in IONIC Project - firebase

Question

Scenario:
I am trying to add identification via Apple and Firebase for my IONIC 4 application.
So I made my installation:
npm i cordova-plugin-apple-login
ionic cordova plugin add cordova-plugin-apple-login
Then I added in my service :
import {AngularFireAuth} from '#angular/fire/auth';
import {Facebook} from '#ionic-native/facebook/ngx';
import * as firebase from 'firebase';
import {GooglePlus} from '#ionic-native/google-plus/ngx';
declare var SignInWithApple: any;
export class AuthService {
constructor(public fAuth: AngularFireAuth,
public fb: Facebook,
public google: GooglePlus) {}
async loginApple() {
SignInWithApple.request({requestedScopes: [ SignInWithApple.Scope.Email, SignInWithApple.Scope.FullName ]})
.then((appleCredential) => {
const credential = new firebase.auth.OAuthProvider('apple.com').credential(appleCredential.identityToken);
this.fAuth.auth.signInWithCredential(credential)
.then((response) => {
console.log('Login successful');
})
.catch((error) => {
console.log(error);
alert('error:' + JSON.stringify(error));
});
});
}
}
Problem:
This is the method I find everywhere on the internet, but it gives me the error:
SignInWithApple is not defined
I also tried this :
Scenario:
ionic cordova plugin add cordova-plugin-sign-in-with-apple
npm i --save #ionic-native/sign-in-with-apple
import {AngularFireAuth} from '#angular/fire/auth';
import {Facebook} from '#ionic-native/facebook/ngx';
import * as firebase from 'firebase';
import {GooglePlus} from '#ionic-native/google-plus/ngx';
import { SignInWithApple,
AppleSignInResponse,
AppleSignInErrorResponse,
ASAuthorizationAppleIDRequest } from '#ionic-native/sign-in-with-apple';
export class AuthService {
constructor(public fAuth: AngularFireAuth,
public fb: Facebook,
public google: GooglePlus) {}
async loginApple() {
try {
const appleCredential: AppleSignInResponse = await SignInWithApple.signin({
requestedScopes: [
ASAuthorizationAppleIDRequest.ASAuthorizationScopeFullName,
ASAuthorizationAppleIDRequest.ASAuthorizationScopeEmail
]
});
const credential = new firebase.auth.OAuthProvider('apple.com').credential(
appleCredential.identityToken
);
this.fAuth.auth.signInWithCredential(credential)
.then((res) => {
console.log('Login successful', res);
})
.catch((error) => {
console.log(error);
});
} catch (error) {
console.log(error);
}
}
}
Problem:
Class not found
I don't find much explanation on the documentation ...
In both I have an error that I do not understand, what is the method to keep and how to correct it ?
An idea ?
Thank you