Android Create Singleton LiveData to Observe Changes (e.g. User Login and Logout) - Kotlin

object App {    class User(val id: String, val name: String, val isAdmin: Boolean)    var currentUser: User?        get() = currentUserLiveData.value        set(value) {            currentUserLiveData.postValue(value)        }    val currentUserLiveData = MutableLiveData<User?>()}

App.currentUser = App.User("5pSFOxspzl75hYZzjnut", "Desmond Lua", true)

App.currentUser = null

App.currentUserLiveData.observe(this, Observer { user ->    // do something})