> I'm guessing Scala.js's slow compiles and heavy output size is an annoyance Compared to BuckleScript, sure, but that's an extreme outlier, near instantaneous

> I'm guessing Scala.js's slow compiles and heavy output size is an annoyance Compared to BuckleScript, sure, but that's an extreme outlier, near instantaneous whole project (wtf) compilation times with tiny output is most definitely not the norm. As a Scala.js user that is also subjected to the Angular/Ionic/Webpack world, the former is very fast, as in, 1-2 seconds incremental compilation, whereas the latter is a lumbering beast, often taking over 10 seconds for "live reload" for even the simplest of changes. In terms of output size, yes, there is the Scala collections "tax" (@150KB), but thereafter the bang-for-buck factor pays off -- all the power of Scala with minimal increase in bundle size.