MvrxRenderer.kt

MyMvrxViewModel<State, Rendering>(services:Services, userId:String, loadingVM: LoadingViewModel, dataVM:DataViewModel){
  sealed class State{
   object Loading():State
   data class Data(value:String)
  }

 
  override fun render(context:RenderScope, state:State):{
    return when(state)
      is Loading -> renderChild(loadingVM){ setState{State.Data} }
      is Data -> renderChild(dataVM) { setState{State.Detail)}
      is Detail -> renderChild(detailVM) {setState{//next screen}                               
  }
}
                                      
LoadingViewModel<State, Rendering>(service:Service){
  sealed class State{
     object Loading():State
  }

  sealed class Rendering{
   data class Loading(message:String="Loading"):Rendering
  }
  
  override fun render(context:RenderScope, state:State):{
    return when(state)
      is Loading ->  { 
                      context.execute(service.getSuspendedData){ setOutput(it)} //output goes back to parent to render something else
                      Rendering.Loading 
                      } 
  }
}