mozilla/source-map — pull request #5 by johnjbarton (2012-02-24 00:51:21+00:00)
Title: Convert to UMD returnExports modules, https://github.com/umdjs/umd

Tested in browser.

This is FYI, since I know module formats are not something anyone can agree on. I was not able to get the original form to work so I'm trying this one.