using fb login with angular app

npm install --save angularx-social-loginexport class AppComponent implements OnInit {
  ...
}const config = new AuthServiceConfig([
  {
    id: FacebookLoginProvider.PROVIDER_ID,
    provider: new FacebookLoginProvider('2203659926599837')
  }
]);

export function provideConfig() {
  return config;
}<div class="example-container mat-elevation-z8">
  <mat-card class="example-card">
    <mat-card-header>
      <mat-card-title><h2>Welcome <span *ngIf="loggedIn===true">{{user.firstName}} {{user.lastName}}, </span> to Angular 8 Application</h2></mat-card-title>
      <mat-card-subtitle>
        <button type="button" (click)="signInWithFB()" *ngIf="loggedIn===false" mat-flat-button color="primary">Sign In With Facebook</button>
        <button type="button" (click)="signOut()" *ngIf="loggedIn===true" mat-flat-button color="primary">Sign Out From Facebook</button>
      </mat-card-subtitle>
    </mat-card-header>
  </mat-card>
  <mat-card class="example-card" *ngIf="loggedIn===true">
    <mat-card-header>
      <mat-card-title><h2>Your Facebook Profile:</h2></mat-card-title>
      <mat-card-subtitle>Full Name: {{user.firstName}} {{user.lastName}}</mat-card-subtitle>
    </mat-card-header>
    <img mat-card-image [src]="user.photoUrl" alt="My Facebook Photo">
    <mat-card-content>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
    </mat-card-content>
  </mat-card>
</div>imports: [
  ...
  MatIconModule,
  MatButtonModule,
  MatCardModule
],signInWithFB(): void {
  this.authService.signIn(FacebookLoginProvider.PROVIDER_ID);
}

signOut(): void {
  this.authService.signOut();
}providers: [
  {
    provide: AuthServiceConfig,
    useFactory: provideConfig
  }
],.example-container {
  position: relative;
  padding: 5px;
  background-color: aqua;
}

.example-loading-shade {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 56px;
  right: 0;
  background: rgba(0, 0, 0, 0.15);
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.example-card {
  margin: 5px;
  padding-bottom: 40px;
}import { AuthService, FacebookLoginProvider, SocialUser } from 'angularx-social-login';ngOnInit() {
  this.authService.authState.subscribe((user) => {
    this.user = user;
    this.loggedIn = (user != null);
    console.log(this.user);
  });
}