code: function SubEmitterSocket() {
    this.sock = new SubSocket;
    this.sock.onmessage = this.onmessage.bind(this);
    this.bind = this.sock.bind.bind(this.sock);
    this.connect = this.sock.connect.bind(this.sock);
    this.close = this.sock.close.bind(this.sock);
    this.listeners = [];
  }
docs: Initialzie a new `SubEmitterSocket`.
  
  @api private