Is it possible to have a hook in watchify post bundle instead of watching the built file?

https://github.com/Kureev/browserify-patch-server/blob/master/makeWatcher.js

Maybe we could hook into watchify's post bundle?

Start with makeWatcher.js and inspect how the repository currently watches the built file and how watchify exposes its post-bundle hook. Confirm whether the hook can replace file watching, then define the behavior and tests needed to show that patching runs after each bundle without watching the output file.

Written by the indexing model from the issue text.