/**
   * instance.wechaty is for:
   *  Contact.wechaty
   *  FriendRequest.wechaty
   *  Message.wechaty
   *  Room.wechaty
   *
   * So it only need one `wechaty` for all the instances
   */
  public get wechaty(): Wechaty {
    // log.silly('Accessory', '#%d<%s> get wechaty()',
    //                               this[SYMBOL_COUNTER],
    //                               this[SYMBOL_NAME] || this,
    //           )

    /**
     * Get `wechaty` from Class Static puppet property
     * note: use `instanceToClass` at here is because
     *    we might have many copy/child of `Accessory` Classes
     */
    return instanceToClass(this, Accessory).wechaty
  }

  /**
   * @ignore
   * Instance Properties
   *
   */
  constructor (
    public id: string,
  ) {
    super()
    log.verbose('RoomInvitation', 'constructor(id=%s)', id)

    // tslint:disable-next-line:variable-name
    const MyClass = instanceToClass(this, RoomInvitation)

    if (MyClass === RoomInvitation) {
      throw new Error('RoomInvitation class can not be instanciated directly! See: https://github.com/Chatie/wechaty/issues/1217')
    }

    if (!this.puppet) {
      throw new Error('RoomInvitation class can not be instanciated without a puppet!')
    }
  }

  /**
   * instance.puppet
   *
   * Needs to support different `puppet` between instances.
   *
   * For example: every Wechaty instance needs its own `puppet`
   *
   * So: that's the reason that there's no `private _wechaty: Wechaty` for the instance.
   *
   */
  public get puppet(): Puppet {
    // log.silly('Accessory', '#%d<%s> get puppet()',
    //                               this[SYMBOL_COUNTER],
    //                               this[SYMBOL_NAME] || this,
    //           )

    if (this._puppet) {
      return this._puppet
    }

    /**
     * Get `puppet` from Class Static puppet property
     * note: use `instanceToClass` at here is because
     *    we might have many copy/child of `Accessory` Classes
     */
    return instanceToClass(this, Accessory).puppet
  }

  /**
   * @private
   */
  constructor(
    public readonly id: string,
  ) {
    super()
    log.silly('Room', `constructor(${id})`)

    // tslint:disable-next-line:variable-name
    const MyClass = instanceToClass(this, Room)

    if (MyClass === Room) {
      throw new Error('Room class can not be instanciated directly! See: https://github.com/Chatie/wechaty/issues/1217')
    }

    if (!this.puppet) {
      throw new Error('Room class can not be instanciated without a puppet!')
    }

  }