NewsLoadingBasicUsecase.kt

// MainViewModel
class NewsViewModel (
    private val newsRepository: NewsRepository = NewsRepositoryImpl()
) : ViewModel() {

    init {
        fetchNews()
    }

    private fun fetchNews() {
        viewModelScope.launch {
            newsRepository.fetchNews()
        }
    }
}

// MainScreen
@Composable
fun NewsScreen(viewModel: NewsViewModel = NewsViewModel()) {
    LazyColumn{
        // showing list of
    }
}