The alternative Kotlin compilers are currently at the "proof of concept" stage, but aren't usable, or supported much by the community. Scala's JavaScript compi

The alternative Kotlin compilers are currently at the "proof of concept" stage, but aren't usable, or supported much by the community. Scala's JavaScript compiler (http://www.scala-js.org/ http://www.scala-js.org/) on the other hand is production ready and supported by the whole ecosystem, with plenty of libraries being cross-compiled to both the JVM and JS. Scala Native piggybacks on top of the work made for Scala.js — it's harder, due to not being able to piggyback on another platform this time, so they have to deal with things like concurrency or garbage collection, but it's progressing nicely. Scala Native isn't production quality yet, but it's at that stage where it's fun to play with it and the Gitter channel has some friendly folks you can interact with: https://gitter.im/scala-native/scala-native https://gitter.im/scala-native/scala-native