ifandelse.com/its-not-hard-making-your-library-support-amd-and-commonjs

commonjs-amd-browser-support.js

(function (root, factory) {
  if(typeof define === "function" && define.amd) {
    // Now we're wrapping the factory and assigning the return
    // value to the root (window) and returning it as well to
    // the AMD loader.
    define(["postal"], function(postal){
      return (root.myModule = factory(postal));
    });
  } else if(typeof module === "object" && module.exports) {
    // I've not encountered a need for this yet, since I haven't
    // run into a scenario where plain modules depend on CommonJS
    // *and* I happen to be loading in a CJS browser environment
    // but I'm including it for the sake of being thorough
    module.exports = (root.myModule = factory(require("postal")));
  } else {
    root.myModule = factory(root.postal);
  }
}(this, function(postal) {
  var myModule = {};
  // module code here....
  return myModule;
}));