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I was wondering why no one has mentioned scala.js here. It would seem to have a good story to tell - strong typing and, according to the project site[1], good interop with JS. As a Scala developer with some front-end experience, exclusively with CoffeeScript (which I think is beautiful BTW, not a popular opinion in these parts), I wonder what are perceived to be the downsides, other than learning-curve and relative immaturity, of "client-side Scala"? I can imagine developers being adverse to working with a heavyweight toolset, but are there in fact interop (or other) problems?

[1] http://www.scala-js.org/