Scala.js (and native) can use Mima, so actually enable that :)
Don't assume that Scala.js only exists in cross-projects. If a project is Scala.js only, it is not detected and all your awesome Scala.js settings don't kick in. E.g. the -P:scalajs:mapSourceURI: stuff which as a result is broken for macrotask executor.
So far I think there are two primary issues:
-P:scalajs:mapSourceURI:
stuff which as a result is broken for macrotask executor.