Adding AMD into the mix and don't forget CommonJS

gistfile1.js

/* Thanks to http://oli.me.uk/2013/07/21/exporting-through-amd-commonjs-and-the-global-object/ */

(function () {
  // YOUR ORIGINAL CODE HERE

  if (typeof define === 'function' && define.amd) {
      define(function () {
          return Foo;
      });
  }
  else if (typeof module !== 'undefined' && module.exports) {
      module.exports = Foo;

      // Or maybe: module.exports.Foo = Foo;
      // It's up to you really.
  }
  else {
      this.Foo = Foo;
  }
}.call(this));