chibatching

fun <T> Flow<T>.throttle(waitMillis: Int) = flow {
    coroutineScope {
        val context = coroutineContext
        var nextMillis = 0L
        var delayPost: Deferred<Unit>? = null
        collect {
            val current = SystemClock.uptimeMillis()
            if (nextMillis < current) {
                nextMillis = current + waitMillis