title: Using Google OAuth in Angular 12 with @angular/fire@^7.0.0 firebase@^9.0.0
body: <p>After imports angular/file modules in <code>app.module.ts</code></p>
  <pre><code>import { provideFirebaseApp, getApp, initializeApp } from '@angular/fire/app';
  import { getFirestore, provideFirestore } from '@angular/fire/firestore';
  
  @NgModule({
    imports: [
      provideFirebaseApp(() =&gt; initializeApp({ ... })),
      provideFirestore(() =&gt; getFirestore()),
    ],
    ...
  })
  export class AppModule { }
  </code></pre>
  <p>How can I manage Auth services on a lazy featured module?</p>