Simple Javascript Extend Object

var Original = {
  extend : function(props = null) {
    var newOne = Object.assign({}, this);
    newOne.super = Object.assign({}, newOne);
    if (props != null) {
      for(var key in props){
        if(props[key].toString().includes('.super') == false){
          if(key != 'construct'){
            console.log('key',key);
            newOne.super[key] = props[key];
          }
        }
      }
      return (Object.assign(newOne, props));
    }
    return newOne;
  },
  construct : function(){
    console.log('base construct')
  },
  new : function(...props){
    this.construct.call(this,...props);
    return Object.assign({},this);
  },
}

/* Extend for the first time */
var testExtendObject = Original.extend({
  construct : function(){
    console.log('testExtendObject constructor called');
    this.super.construct();
  },
  getOne : function(){
    console.log('testExtendObject - getOne called!');
  }
})

/* Extend for the second time */
var test2ExtendObject = testExtendObject.extend({
  construct : function(){
    console.log('test2ExtendObject - constructor called!');
    this.super.construct();
    // Nested called super
    // this.super.super.construct();
  },
  getOne : function(){
    console.log('test2ExtendObject - getOne called!');
    this.super.getOne();
  }
})

/* Run it! */
var test2 = test2ExtendObject.new();
test2.getOne();