how can I use `value class` in a multiplatform project? Previously I used `inline class` but I see i...

# multiplatform

[Piotr Krzemiński]

how can I use value class in a multiplatform project? Previously I used inline class but I see it’s deprecated now. Using value class produces an error “Value classes without @JvmInline annotation are not supported yet” and I cannot use @JvmInline in a multiplatform project obviously. What’s the recommended path forward? Keep using inline class? What’s the plan of proper multiplatform support for value class?
Once we clarify all of it, I’ll propose some changes to the docs: https://kotlinlang.org/docs/inline-classes.html

[hfhbd]

You can use @JvmInline in multiplatform common code: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.jvm/-jvm-inline/

[Piotr Krzemiński]

oh, right! 🤦 it must have been some IDE glitch that it showed it in red, thanks!

[Johann Pardanaud]

however, value classes aren’t compatible with @JsExport

[Piotr Krzemiński]

it makes sense since they exist only in compile time

[Piotr Krzemiński]

no need for docs adjustment then, the IDE correctly suggests the replacement code

[CLOVIS]

However value class currently does nothing on non-JVM platforms, it's just here for forward compatibility for when it will do something

[Piotr Krzemiński]

but it does inline the class if there’s a single field right? otherwise it would be a regression comparing to inline class

[CLOVIS]

As far as I know, there was never any inlining outside of the JVM, which is why they removed the inline modifier and replaced it with @JvmInline

[CLOVIS]

Hm, YouTrack seems to say they were truly inlined in JS IR. No idea, then.