A simple dagger setup in a single module

NormalDaggerSetup

import android.app.Application
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import dagger.Component
import dagger.Module
import javax.inject.Singleton


@Module
object AppModule{

}

@Singleton
@Component(modules= [AppModule::class])
interface AppComponent{

}


@Module
object FeatureModule{

}

@Component(dependencies = [AppComponent::class], modules = [FeatureModule::class])
interface FeatureComponent{
    fun inject(activity : FeatureActivity)
}


class App : Application(){

    lateinit var component : AppComponent

    override fun onCreate() {
        super.onCreate()

        component = DaggerAppComponent
            .builder()
            .build()
    }

}

class FeatureActivity : AppCompatActivity(){

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val appComponent = (applicationContext as App).component

        DaggerFeatureComponent.Builder()
            .appComponent(appComponent)
            .build()
            .inject(this)
    }
}