I guess once KN support is done - I can look into supporting JS as well. KN is already supported in the 2.x branch however it does not work on kotlin 1.3.70 and higher due to some recent changes to the compiler plugin apis. (see
https://github.com/JetBrains/kotlin/pull/3186 for more details). I'm currently targeting 2.1.0 for KN support but that depends when the issue with our compiler plugin is fixed.