gistfile1.js

function inherits(ctor, base) {
    ctor.prototype             = Object.create(base);
    ctor.prototype.constructor = ctor
    return ctor
}
function extend(tgt) { var sources
    sources = Array.prototype.slice.call(arguments, 1)
    sources.forEach(function(source){
        Object.keys(source).forEach(function(key){
            tgt[key] = source[key] })})
    return tgt
}
function with_traits(){ var traits
    traits = Array.prototype.slice.call(arguments)
    return function(tgt) {
        return extend.apply(this, [tgt].concat(traits)) }
}


inherits(ClassJS, SomeParentObject)
function ClassJS() {
    /* constructor initialization */
}
extend(ClassJS.prototype, function(){
    return with_traits(trait1, trait2, trait3)
           ({ foo: foo
            , bar: bar })

    function foo() { /* ... */  }
    function bar() { /* ... */ }
}())

var instance = new ClassJS
instance.foo()