index.js

(function ( root, factory ) {
    if( typeof define !== 'undefined' && define.amd ) {
        define([],factory);
    } else if (typeof exports === 'object') {
        module.exports = factory();
    } else {
        root.inherits = factory();
    }
})(this, function (){

    var hasOwn = {}.hasOwnProperty;
    return (typeof Object.create == 'function' ) ? function ( child, parent ) {
            //Backbone/CoffeeScript API
            for (var key in parent) {
                if (hasOwn.call(parent, key)) child[key] = parent[key];
            }
            child.__super__ = parent.prototype;
            //node API
            child.super_ = parent;
            child.prototype = Object.create(parent.prototype, {
                constructor: {
                    value: child,
                    enumerable: false,
                    writable: true,
                    configurable: true
                }
            })
        }
    : function (child, parent) {
        for (var key in parent) {
            if (hasOwn.call(parent, key)) child[key] = parent[key];
        }
        function ctor() {
            this.constructor = child;
        }
        ctor.prototype = parent.prototype;
        child.prototype = new ctor();
        //CoffeeScript API
        child.__super__ = parent.prototype;
        //node API
        child.super_ = parent;
        return child;
    };
});