Universal Module definition va https://github.com/tbranyen/growing-up-with-backbone

umd.js

(function(window, factory) {
  if (typeof exports === "object") {
    // Node. Does not work with strict CommonJS, but only CommonJS-like
    // enviroments that support module.exports, like Node.
    module.exports = factory();
  } else if (typeof define === "function" && define.amd) {
    // Allow using this built library as an AMD module in another project. That
    // other project will only see this AMD call, not the internal modules in
    // the closure below.
    define(factory);
  } else {
    // Browser globals case. Just assign the result to a property on the
    // global.
    window.WebApp = factory();
  }
}(this, function() {

  // Your code goes here.

}));