How to properly call `suspend` function from `js` ...

# javascript

[Tuan Kiet]

How to properly call suspend function from js site? or are we shouldn’t call at all?

[gildor]

what is “properly call”? You should call suspend function from any coroutine builder, like launch

[Joffrey]

I believe @Tuan Kiet wants to call a Kotlin JS suspend function from JavaScript code, not from Kotlin JS code, but maybe I misunderstood

[Tuan Kiet]

that true, and I quickly realize that from java (or any platform) you shouldn’t call any suspend function, just call a regular function from a object that perform launch of async with it own scope

[Joffrey]

Indeed, suspend functions are a Kotlin feature, and are not really designed to be used from platform code AFAIK

[Systemkern]

I only found an ugly wokaround with JS promises
which looks like this for my function.

import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.promise
import kotlin.js.Promise

suspend fun getGroup(…): Group = …

@JsName("getGroup")
fun getGroupWrapper(…): Promise<Group> =
    GlobalScope.promise { 
        getGroup(…) // suspend fun getGroup(): Group 
    }

[gildor]

It's not ugly, it's way how you make coroutines work with platform asyncronous API, the same on JVM