sample_dagger.kt

@Module(subcomponents = [ChildComponent::class])
class SomeModule {
  @Provides
  @Singleton
  fun provideComplexDependency(componentDep: ComponentDep): ComplexDependency { ... }
}

-----

@Scope annotation class ChildScope

-----

@Subcomponent(modules = [SomeChildModule::class])
@ChildScope
interface ChildComponent { ... }

-----

@Module
class SomeChildModule {
  @Provides
  @ChildScope
  fun provideSpecialDependency(impliedDependency: ImpliedDependency): SpecialDependency { ... }
}

-----

// This class doesn't need an explicit provider since it has an @Inject constructor.
@Singleton class ImpliedDependency @Inject constructor() { ... }

-----

@Singleton
@Component(modules = [SomeModule::class])
interface SingletonComponent {
  @Component.Builder
  interface Builder {
    @BindsInstance fun setComponentDep(componentDep: ComponentDep): Builder
    fun build(): SingletonComponent
  }
  fun inject(classWithFieldInjection: ClassWithFieldInjection)
}

-----

@Singleton
class ClassWithCtorInjection @Inject constructor(complexDependency: ComplexDependency) { ... }

-----

class ClassWithFieldInjection {
  @Inject lateinit var impliedDependency: ImpliedDependency
  
  fun setUpObject(componentDep: ComponentDep) {
    DaggerSingletonComponent.builder().setComponentDep(componentDep).build().inject(this)
  }
}