So I tried Clojurescript and I liked it as a language. In terms of fit for a compile-to-Javascript language, it is probably the best implementation out there, partially due to Javascript's dynamic lispy origin. But it has a a major problem: It's not Clojure. It might be a Clojure-like language, but its not Clojure. So you still end up "splitting", but when you split you have to squint harder at the details. As far as fidelity to the native language, I've found Scala.js to be much better.
I can't wait for WebAssembly though... it will be a game changer for people that prefer strong static typing for managing logical complexity.
I haven't used Scala.js, but I find Clojure and ClojureScript to be so damn close to identical I'm surprised at this comment. When I'm doing ClojureScript, everything I use from syntax, sequences, persistent data structures, core.async, protocols and records (the list seems endless) is the same as Clojure. The only thing that trips me up is regular expressions. In fact, I find there's a great deal more difference in the Scala written by any given two Scala developers than between Clojure and ClojureScript.
I can't wait for WebAssembly though... it will be a game changer for people that prefer strong static typing for managing logical complexity.