I'm trying to run the tests in the Kotlin Multiplatform library tutorial: <https://kotlinlang.org/do...

# javascript

[Erik]

I'm trying to run the tests in the Kotlin Multiplatform library tutorial:
https://kotlinlang.org/docs/multiplatform-library.html#js
The JS tests fail with: ReferenceError: Buffer is not defined
I can reproduce it here: https://pl.kotl.in/AklbZ91yN
How do I proceed to...
• ... solve this issue locally?
• ... report this reproducible bug?

[turansky]

AFAIK - Kotlin Buffer - alias for JS ArrayBuffer

js("Buffer") - why not kotlin.Buffer ?

[Erik]

The Kotlin MPP example code uses this exactly, hence why 😉

[turansky]

Do you need nodejs target?

[Erik]

Apparently the tutorial uses this nodejs API, but it doesn't work

[Erik]

I don't need it, I just want the tutorial to work properly

[turansky]

On playground browser target used

[turansky]

Node - JS Buffer
Browser - JS ArrayBuffer or kotlin.Buffer

[Erik]

I understand where the issue comes from now

[Erik]

The tutorial assumes that you use a nodejs target, but if you follow the tutorial and create a project from scratch, you end up with a browser JS target

[Erik]

What I still don't understand is how to use ArrayBuffer or kotlin.Buffer, as I only can find https://kotlinlang.org/api/latest/jvm/stdlib/org.khronos.webgl/-array-buffer/ from the org.khronos.webgl package, which is likely not what you're referring to? And I can't find anything about kotlin.Buffer

[turansky]

My bad - it was Buffer from Ktor IO (mixed with kotlin.ByteArray)

[turansky]

you end up with a browser JS target

Looks like an issue

[Erik]

I've proposed a fix: https://github.com/JetBrains/kotlin-web-site/pull/2460

[Erik]

Now merged and released! 🎉