clojure-emacs/clojure-mode — pull request #182 by cemerick (2013-10-19 10:39:10+00:00)
Title: add .cljx to auto-mode-alist

Cljx is a Leiningen plugin allowing one to write portable Clojure/ClojureScript code using "feature expression" annotations:

https://github.com/lynaghk/cljx

Such code is held in `.cljx` files, which — aside from those annotations — are Clojure files, which deserve proper clojure-mode handling.