export class Supervisor {
  #subscriberI: number = 0
  #subscribers: Record<number, () => void> = {}

  constructor() {
  }

  notify() {
    for (let i in this.#subscribers) {
      this.#subscribers[i]();
    }
  }

  onNotify(cb: () => void) {
    let i = this.#subscriberI++;
    this.#subscribers[i] = cb;
    return i;
  }

  removeOnNotify(handle: number) {
    delete this.#subscribers[handle]
  }

}