:kotlinnew::webassembly: + :js: Questions for tho...

# webassembly

[Svyatoslav Kuzmich [JB]]

K.wasm + js

Questions for those interested in using Kotlin/Wasm with JavaScript:
• Are you primarily interested in calling JavaScript code from Kotlin, calling Kotlin from JavaScript, or both?
• Additionally, if you have tried the current JS interop system, which use-cases that interest you the most are not yet covered?
Thanks!

[Stefan Oltmann]

1: Calling JS Code from Kotlin where a pure Kotlin KMP library is (yet) missing
2: Can I name unit tests with resources as a use case? 😅

[andylamax]

1. Calling Javascript from Kotlin
2. Native support of @JsExport from common code is a use case that is currently not supported
3. A common abstraction layer of definitions for kotlin/js and kotlin/wasm. One that works well with JsAny for both platforms

[Robert Jaros]

1. Calling JS from Kotlin
2. Array types (see: https://kotlinlang.slack.com/archives/CDFP59223/p1695580635822079)
3. Common layer for K/JS and K/Wasm (including DOM declarations usable from common code, see: https://kotlinlang.slack.com/archives/CDFP59223/p1701875444502719)

[Oliver.O]

1. Calling JS from Kotlin
2. Catching JS exceptions in Kotlin.
3. Stdlib types like Promise as regular commonized Kotlin types, not using JsAny.

[Stefan Oltmann]

I wish for a lot more extension functions to make this easier.

These should be provided by stdlib:
• fun Uint8Array.toByteArray(): ByteArray
• fun ByteArray.toUint8Array(): Uint8Array
• fun ByteArray.toBlob(mimeType: String): org.w3c.files.Blob
For a beginner it's not obvious how to implement them and now that I know how to do it i just copy & paste them around. This is a clear indication (to me) that it should come with the standard library.