See https://github.com/mdevils/node-jscs
This is the first tool I've seen in the category of asserting coding style for javascript that actually looks like it is worth looking into further.
I intend to experiment with it in the near future for 1 or 2 projects, first in non-voting mode and perhaps later to become a standard enabled job for many projects.
Version: wmf-deployment
Severity: enhancement