boilerplate.js

(function(){

    function Klass(id){ this._id = id; }
    Klass.prototype.id = function(){ console.log(this._id); }
    expose('Klass', Klass);

    /*!
     * 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;
    }
})();

nodejs_require.txt

> var Klass = require('./js/boilerplate.js')
> var foo = new Klass('foo')
> foo.id()
foo