Chain.kt

CoroutineScope(context = Dispatchers.Main.immediate).launch() {
        doAction()
        flowOf("Hey")
            .onEach { doAction() }
            .map { it.length }
            .onStart { doAction() }
            .flowOn(Dispatchers.Default)
            .flatMapMerge {
                doAction()
                flowOf(1)
                    .flowOn(Dispatchers.Main)
                    .onEach { doAction() }
            }
            .flowOn(Dispatchers.IO)
            .collect {
                doAction()
            }
    }
}