Component exporting to dependent components

gistfile1.txt

interface SingletonsToExport {
  SomeService someService();
  OkHttpClient httpClient();
  GooglePlayThingamabob playThingy();
}

@Singleton
@Component(...)
interface ApplicationComponent extends SingletonsToExport {
  void inject(MyApplication app);
}

@PerActivity
@Component(dependencies = ApplicationComponent)
interface MainActivityComponent {
  // MainActivity can see any types in SingletonsToExport
  // because ApplicationComponent implements it and 
  // MainActivityComponent depends on ApplicationComponent
  void inject(MainActivity activity);
}

class MainActivity extends Activity {
  @Inject OkHttpClient client;
  @Inject GooglePlayThingamabob playThingamy;
  ... onCreate etc...
}