PricesViewModel.kt

class PricesViewModel @Inject constructor(
        errorFormatter: dagger.Lazy<ErrorFormatter>,
        pricesUseCase: dagger.Lazy<GetPricesUseCase>

): ViewModel() {
    val state = pricesUseCase.get().invoke()
            .map {
                State.Success(it)
            }
            .catch {
                val error = errorFormatter.get().format(it)
                emit(State.Error(error))
            }.stateInDefault(viewModelScope, State.Loading)

}