heroku/heroku-buildpack-nodejs — pull request #67 by zeke (2013-11-25 06:04:45+00:00)
Title: Simplified caching strategy

If node_modules directory is checked into source control, rebuild any native deps. Otherwise, restore from the build cache. This is a much simpler strategy than look for changes in `npm-shrinkwrap.json` and/or `package.json`.