Yes, but I factor in having to create a folder structure, edit the project.clj file to add my compilation targets, and all of that, it's not "light weight" for

Yes, but I factor in having to create a folder structure, edit the project.clj file to add my compilation targets, and all of that, it's not "light weight" for something like a small script that just is a single widget. Btw, I ran: time lein cljsbuild once on a project with a minor change (added a line break) and it took 22 seconds.... so this is also what I'm talking about.