AMD-compatible CommonJS Module/1.1 that can also be loaded in a script tag

dual.js

(function () {
    /*!
     * expose.js
     *
     * @author Oleg Slobodskoi
     * @website https://github.com/kof/expose.js
     * @licence Dual licensed under the MIT or GPL Version 2 licenses.
     */
    function expose(namespace, api) {
        var env = {};

        if (typeof namespace !== 'string') {
            api = namespace;
            namespace = null;
        }

        // the global api of any environment
        // thanks to Nicholas C. Zakas
        // http://www.nczonline.net/blog/2008/04/20/get-the-javascript-global/
        env.global = (function(){
            return this;
        }).call(null);

        // expose passed api as exports
        env.exports = api || {};

        // commonjs
        if (typeof module !== 'undefined' &&
            typeof exports !== 'undefined' &&
            module.exports) {
            env.commonjs = true;
            env.module = module;
            module.exports = exports = env.exports;
        }

        // browser only
        if (typeof window !== 'undefined') {
            env.browser = true;
            // we are not in amd wrapper
            if (!env.commonjs && namespace && env.exports) {
                env.global[namespace] = env.exports;
            }
        }

        return env;
    }

    // My module
    // Constructor
    function Module( val ){ this.prop = val; }

    // Static / "Class" Methods
    Module.do = function( something ){ console.log('Module.do(',something,')'); };

    // Instance methods
    Module.prototype = {
        method = function(){ console.log(arguments); },
        secret = 42
    };

    expose('Module', Module);
})();