Base class for Javascript

Class.js

define(["jq"], function($){
        "use strict";
        var Class = function(){};
        var minimal_class_definition =
            {
                init: function()
                {
                }
            };
        var extend = function (base_class, additionnal_definition)
        {
            var _class_definition = $.extend({}, base_class._class_definition, additionnal_definition);
            var new_class = function(){
                $.extend(this, _class_definition);
                this.init.apply(this, arguments);
            };
            new_class._class_definition = _class_definition;
            return new_class;
        };
        Class = extend(Class, minimal_class_definition);
        Class.extend = extend;
        return Class;
    }
);


// a class wouls look like that :
/*global define */
define(["Class", "jquery"],
    function(Class, $){
        "use strict";
        var ClassName = Class.extend(Class,
            {
                init: function()
                {
                },
            }
        );
        return ClassName;
    }
);

function Thing (foo) {
    this.foo = foo;
    Base.apply(this); // invoke Base constructor
}

// inherit properties and methods from Base
Thing.prototype = Object.create(Base.prototype);

// override Base's bar method
Thing.prototype.bar = function (a, b) {
    return Base.prototype.bar.call(this, a, b) + ' overridden';
}