Proof of concept for Kotlin JS coroutines delay()

coroutine-delay.kt

import kotlin.coroutines.experimental.*
import kotlin.js.Date

fun main(args: Array<String>) {
    println("before launch")
    launch {
        println("hello: ${Date()}")
        delay(3000)
        println("bye: ${Date()}")
    }
    println("after launch")
}

fun launch(block: suspend () -> Unit) {
    block.startCoroutine(object : Continuation<Unit> {
        override val context = EmptyCoroutineContext
        override fun resume(value: Unit) = Unit
        override fun resumeWithException(exception: Throwable) = console.error(exception)
    })
}

suspend fun delay(ms: Long): Unit = suspendCoroutine { continuation ->
        setTimeout({
            println("timeout")
            continuation.resume(Unit)
        }, ms)
    }

//Use top level setTimeout function instead of window.setTimeout to use with node.js
external fun setTimeout(function: () -> Unit, delay: Long)

//Output example:
//before launch
//hello: Mon Nov 20 2017 16:50:02 GMT+0800 (+08)
//after launch
//timeout
//bye: Mon Nov 20 2017 16:50:05 GMT+0800 (+08)

wow, I completely missed that launch is included in kotlinx-coroutines-core-js. The autocomplete wasn't offering it for me so I thought it wasn't implemented or something, but now I realize it's only available inside a CoroutineScope... well, thanks again! :)