I made it too based on a StackOverflow answer a few years ago, but this one is probably much better (I hadn't even put a package.json at the time). However, the SO thread is really interesting, I suggest you give it a look if you're interested in how to solve this issue.

[1] http://stackoverflow.com/questions/13637892/how-does-the-alg...

[2] https://github.com/arcanis/colibri.js