import { FirestoreSettingsToken } from '@angular/fire/firestore'; ... { provide: FirestoreSettingsToken, useValue: {} }
import { AngularFirestoreModule, FirestoreSettingsToken } from '@angular/fire/firestore'; @NgModule({ declarations: [AppComponent], imports: [ ... AngularFirestoreModule, ... ], providers: [{ provide: FirestoreSettingsToken, useValue: {} }], bootstrap: [AppComponent] }) export class AppModule { }