Наследование классов с интерфейсом класса прототипа

var App = {};

App.hello = Class.create({

    initialize: function(args) {
        this.name = args.name
    },

    sayHello: function() {
        console.log('Hello, ' + this.name);
    },

    sayGoodbye: function() {
        console.log('Goodbye, ' + this.name);
    }

});

App.yo = Class.create(App.hello, {

    initialize: function($super, args) {
        $super(args);
    },

    sayHello: function() {
        console.log('Yo, ' + this.name);
    }

});

var test = new App.hello({name: 'Cameron'});
    test.sayHello();
    test.sayGoodbye();
var test2 = new App.yo({name: 'Cameron'});
    test2.sayHello();
    test2.sayGoodbye();

<script src="https://cdnjs.cloudflare.com/ajax/libs/prototype/1.7.3/prototype.min.js"></script>

const App = {};

App.hello = class {
    constructor(args) {
        this.name = args.name
    }

    sayHello() {
        console.log('Hello, ' + this.name);
    }

    sayGoodbye() {
        console.log('Goodbye, ' + this.name);
    }
};

App.yo = class extends App.hello {
    sayHello() {
        console.log('Yo, ' + this.name);
    }
};

const test = new App.hello({name: 'Cameron'});
      test.sayHello();
      test.sayGoodbye();
const test2 = new App.yo({name: 'Cameron'});
      test2.sayHello();
      test2.sayGoodbye();