observe-for-compose.kt

@Composable
fun <T> observe(observable: () -> LiveData<T>, result: (T) -> Unit) {
    val thing = stateFor<T?> { null }
    onActive {
        val observer =
            Observer<T> {
                thing.value = it
                result(it)
            }
        with(observable()) {
            observeForever(observer)
            onDispose {
                removeObserver(observer)
            }
        }

    }
    thing.value
}