class-config-stategy.es6

class Car {
  options() {
    return { truckmode: false, big: false };
  }
  
  static config(ops) {
    return class extends this {
      options() {
        return Object.assign({}, super.options(), ops);
      }
    }
  }
}

var Truck = Car.config({ truckmode: true });

var BigTruck = Truck.config({ big: true });

var civic = new Car();
var ranger = new Truck();
var mactruck = new BigTruck();