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 {};

});

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();