Per David Nolen in #clojure, a single file should serve as a compilation root, rather than the compiler needing to scan a given directory for files.
This leaves a couple of questions:
1. Are discovered dependencies then only ever loaded from the classpath?
2. If so, what does command-line (i.e. bin/cljsc compilation look like? Force people to export CLASSPATH appropriately, provide a set of alternative source paths via arguments, or other?
This would yield a fair bit of breakage downstream, e.g. cljsbuild.