AppComponent.java

@Singleton
@Component(modules = {AppModule.class, AndroidSupportInjectionModule.class, ...})
public interface AppComponent extends AndroidInjector<MyApplication> {

    Picasso picasso();
}

AppComponent.kt

@Singleton
@Component(modules = [AppModule::class, AndroidSupportInjectionModule::class, ...])
interface AppComponent : AndroidInjector<MyApplication> {

    fun picasso(): Picasso
}