BaseViewModelを作って、MutableStateFlowをいい感じに使う

// shared module
abstract class BaseViewModel : ViewModel() {
  protected fun <T> mutableStateFlow(value: T): DelegateMutableStateFlow<T> =
    DelegateMutableStateFlow(MutableStateFlow(value))

  protected suspend fun <T> DelegateMutableStateFlow<T>.emit(value: T): Unit =
    emit(value)
}

class DelegateMutableStateFlow<T>(private val delegate: MutableStateFlow<T>) :
  StateFlow<T> by delegate {

  internal suspend fun emit(value: T) = delegate.emit(value)
}


// app(feature) modules
@HiltViewModel
class MainViewModel @Inject constructor() : BaseViewModel() {
  val viewState = mutableStateFlow(MainViewState())

  init {
    viewModelScope.launch {
        ...
        viewState.emit(newState)
    }
  }
}