title: Angular fire firestore has no exported member 'FirestoreSettingsToken'
body: <p>It happen at the first I do compile my project.</p>
  
  <p>The problem showing this:</p>
  
  <pre><code> Module '".../node_modules/@angular/fire/firestore/angular-fire-firestore"' has no exported member 'FirestoreSettingsToken'
  </code></pre>
  
  <p>my <strong>app.module.ts</strong> file:</p>
  
  <pre><code>import { NgModule } from '@angular/core';
  
  ...
  
  import { AppComponent } from './app.component';
  import { AppRoutingModule } from './app-routing.module';
  import { AngularFireModule } from '@angular/fire';
  import { environment } from '../environments/environment';
  import { AngularFirestoreModule, FirestoreSettingsToken } from '@angular/fire/firestore';
  
  @NgModule({
    declarations: [AppComponent],
    entryComponents: [],
    imports: [
  ...
      AngularFireModule.initializeApp(environment.firebaseConfig),
        AngularFirestoreModule,
    ],
  </code></pre>
  
  <p>With providers:</p>
  
  <pre><code>{provide: FirestoreSettingsToken, useValue: { }}
  </code></pre>
  
  <p>My tools:</p>
  
  <pre><code>Firestore: 8.0.2
  Angular, Firebase, npm: 6.13.4
  </code></pre>