A modern programming language that makes developers happier.

kotlinlang

In the <https://youtrack.jetbrains.com/issue/KT-6168/Ability-to-generate-one-JS-file-for-each-Kotlin-source-file|Kotlin Issue> for Kotlin File to JS File compilation it mentions 9 months ago that there is an issue with kotlinx.serialization. Has that issue been resolved? Are there any known limitations concerning file to file compilation?

Yes, it is. With Beta5 it should be possible to compile all the libraries with file-to-file