heroku/heroku-buildpack-nodejs — pull request #4 by chrisleishman (2011-12-25 01:31:47+00:00)
Title: Reset GIT_DIR when calling npm

The GIT_DIR="." environment is leaking down into NPM. This reset's it to ".git" for NPM.

This issue affects specifying "git:" URIs for npm modules in package.json, and has been discussed here:
http://stackoverflow.com/questions/8243527/use-git-dependencies-in-with-npm-and-node-on-heroku