How to prep a javascript module for node and browser

mymodule

(function() {
  if (typeof exports !== 'undefined') {
    module.exports = (function() {
      var debug = require('debug')('mymodule');
      return exportModule(debug);
    })();
  }
  else if (typeof define === 'function' && define.amd) {
    define(
      [
      ],
      function() {
        return exportModule(function() {});
      }
    );
  } else {
    window.MyModule = exportModule(function() {});
  }

  function exportModule(debug) {
    var MyModule = {};

    MyModule.getVersion = function() {
      return getVersion();
    };


    return MyModule;
  }


  function getVersion() {
    return '0.0.1';
  }
})();

To use in nodejs
var MyModule = require('mymodule')

To use in browser

<script type='text/javascript' src='mymodule.js'></script>

Also supports use via requirejs.