itch.io

Yes it's possible but personally I encounter few problems, sometimes it works, sometimes not.

Uncaught TypeError: Cannot read property 'prototype' of undefined

PS : Don't forget to call super methods if you use them.

class A extends Sup.behavior {
  awake() {
    Sup.log("Awake from A");
  }
}
class B extends A {
  awake() {
    super.awake();
    Sup.log("Awake from B");
  }
  start() {
    Sup.log("Start from B");
  }

}