Adapted book.effects.ts from version 7.3.0 of ngrx/platform

book.effects.ts

@Injectable()
export class BookEffects {
  @Effect({ dispatch: false })
  addBookSuccess$ = this.actions$.pipe(
    ofType(CollectionApiActionTypes.AddBookSuccess),
    withLatestFrom(this.store.select(fromBooks.getCollectionBookIds)),
    tap(([action, bookCollection]) => {
      if (bookCollection.length === 1) {
        window.alert('Congrats on adding your first book!')
      } else {
        window.alert('You have added book number ' + bookCollection.length);
      }
    })
  );

  // search$ effect deleted for simplicity

  constructor(
    private actions$: Actions<FindBookPageActions.FindBookPageActionsUnion>,
    // ...
    private store: Store<fromBooks.State>
  ) {}
}