Universal JavaScript Module, supports AMD (RequireJS), Node.js, and the browser.

universal-module.js

(function (name, definition){
  if (typeof define === 'function'){ // AMD
    define(definition);
  } else if (typeof module !== 'undefined' && module.exports) { // Node.js
    module.exports = definition();
  } else { // Browser
    var theModule = definition(), global = this, old = global[name];
    theModule.noConflict = function () {
      global[name] = old;
      return theModule;
    };
    global[name] = theModule;
  }
})('myModule', function () {

  // return the module's API
  return {};

});

usage.js

// AMD
require(['path/to/myModule'], function (myModule){
  // use myModule here
});

// Node.js
var myModule = require('myModule');

// Global
myModule
// if myModule is already defined, `noConflict` gives it back
var myNonConflictingModule = myModule.noConflict();