WIP: do things when files change on the filesystem (re-run your test suite, for example)
./node_modules/.bin/chicken -c "filesystem had changes" .
To re-run your test suite when any files change (timing how long it takes):
./node_modules/.bin/chicken -c "time npm test" .
My main use case is to re-exec my mocha test suite(s) on file changes.
If you don't like chicken-little, there are others that might work better for you:
I probably missed some, but it's a start.