Hum, that's because you don't actually need to install Scala.js per se. sbt will download and use it for your project automatically. I agree that the way it is

Hum, that's because you don't actually need to install Scala.js per se. sbt will download and use it for your project automatically. I agree that the way it is presented on that page is confusing, though. I'll add some explanation about that when I get back from conferences. Thanks for the feedback!