I am creating a Clean architecture + mvvm project with hilt, but i dont understand one moment of hilt work.
I have a viewModelL

@HiltViewModel
class DateViewModel @Inject constructor(
    private val getWinRateByDayUseCase: GetWinRateByDayUseCase,
    private val getCoordinatesByArrUseCase: GetCoordinatesByArrUseCase,
    private val getDayStatisticsUseCase: GetDayStatisticsUseCase
) : ViewModel(){

ViewModel need getDayStatisticsUseCase which require TradeRepository:

class GetDayStatisticsUseCase(private val tradeRep: TradeRepository) {
    fun execute(): Flow<List<Trade>> {
        return  tradeRep.getDayStatistic()
    }
}

Trade repository implementation :

class TradeRepositoryImp @Inject constructor(private val dataSource:TradeDataSource): TradeRepository 

Question :
I understand why do we need inject constuctor in viewModel but i dont really understand why we dont need it in use case but we need it in repository implementation

Why don’t we need to introduce dependencies injection into the use case?