Comment made by: olical
If this is considered valid I'll submit a patch for it today. As far as I can tell from all of my work with prepls over the last few months this is one of the last major outstanding features. Once CLJ-2453 is in we'll have reader conditionals in both Clojure and ClojureScript too.
The only thing I haven't been able to do is set the current line / column / file path for ClojureScript evals, but that's off topic.