Is there any way (even if dirty) to call a `suspen...

# javascript

[Marc Knaup]

Is there any way (even if dirty) to call a suspend fun from a regular fun?
I only need that for unit testing a single function and can be sure that the function doesn’t actually suspend nor launch any other coroutines.

[Robert Jaros]

You mean without GlobalScope.lauch {} ?

[Marc Knaup]

Yes without, synchronously

[Robert Jaros]

The early versions of kotlinx.coroutines for Kotlin/JS contained an implementation of runBlocking {}. It was removed because it was "dirty", but I remember it was working somehow 🙂. Maybe you can search in the old sources.

[Marc Knaup]

hehe I can try but I guess it used compiler-internal voodoo 😄

[Casey Brooks]

Since JS doesn’t have a way of actually blocking a thread, there’s not many good options. There’s no synchronous sleep, so polling would have to just run CPU cycles. Wrapping .launch { } in a Promise seems to be the most common way of unit testing coroutines, since both Mocha and Karma (the kotlin/JS test runners) support tests that return promises

[Robert Jaros]

It's here 🙂:
https://github.com/Kotlin/kotlinx.coroutines/blob/a7db8ec04cc27d45c8559e24b498aa179a7ef044/js/kotlinx-coroutines-core-js/src/main/kotlin/kotlinx/coroutines/experimental/Builders.kt#L126
Basically it's just a while(true) loop ;-)

[Marc Knaup]

Thanks 🙂
Like like I’d also have to add BlockingEventLoop, BlockingCoroutine and all sorts of things 😅