It depends what you mean by "bundling". For ClojureScript, the output is passed through the Google Closure compiler with advanced optimizations. The result is not a concatenation nor just a minimization -- it is a rewritten program, containing just the parts that are needed and significantly optimized.
So, the big resulting file is not a "bundle" and can't easily be split into parts.
So, the big resulting file is not a "bundle" and can't easily be split into parts.