BaseReactiveState

// You can compose multiple events interfaces with simple inheritance (more elegant than sealed classes)
interface FooEvents : ErrorEvents, OtherEvents, AndMoreEvents {
    fun onUserIsUnauthorized()
}

class FooViewModel(scope: CoroutineScope) : BaseReactiveState<FooEvents>(scope) {
    private val _messages = MutableStateFlow<List<Message>>(emptyList())
    val messages: StateFlow<List<Messages>> = _messages

    init {
        loadMessages()
    }

    fun loadMessages() {
        launch {
            // Let's pretend this function returns null for unauthorized requests
            val messages = retrieveMessagesFromBackend()
            if (messages == null) {
                eventNotifier { onUserIsUnauthorized() }
            } else {
                _messages.value = messages
            }
        }
    }
}