&gt; Who actually uses Scala.js, though? It still seems firmly in the hobbyist camp.<p>This is false. You can see a few commercial uses in &quot;Built with Scala.js&quot; at <a href="https:&#x2F;&#x2F;www.scala-js.org&#x2F;community&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.scala-js.org&#x2F;community&#x2F;</a><p>I have also talked to people out of a few tens of companies who have told me they were using Scala.js in production.