Playback – Interactive Programming and Print Debugging Reimagined

gnl/playback: #>(tag’n’trace any Clojure(-Script) form to tap> and Portal with automatic last-input function replay on eval, instant re-render and hassle-free insertion of traced data into the REPL)

There’s a short screencast, but in the 3 minutes it takes to watch, you might just be up and running with the actual library. If you like it, come upvote the HN submission for eyeballs and internet points.