A Dagger 2 injected ViewModelProvider.Factory implementation.

DaggerViewModelFactory.kt

@Singleton
class DaggerViewModelFactory
@Inject constructor(
         private val creators: Map<Class<out ViewModel>, @JvmSuppressWildcards Provider<ViewModel>>
) : ViewModelProvider.Factory {

    override fun <T : ViewModel> create(modelClass: Class<T>): T {
        val creator = creators[modelClass] ?:
                creators.asIterable().firstOrNull { modelClass.isAssignableFrom(it.key) }?.value
                ?: throw IllegalArgumentException("unknown model class " + modelClass)

        return try {
            creator.get() as T
        } catch (e: Exception) {
            throw RuntimeException(e)
        }

    }
}

ViewModelFactoryModule.kt

@Module
abstract class ViewModelFactoryModule {
    @Binds
    internal abstract fun bindViewModelFactory(factory: GithubViewModelFactory): ViewModelProvider.Factory
}

ViewModelKey.kt

@Target(AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER)
@MapKey
internal annotation class ViewModelKey(val value: KClass<out ViewModel>)