Method _onerror

lib/socket.ts:726–732

* Handles a client error. * * @private

(err: Error)

   * @private
   */
  _onerror(err: Error): void {
    // FIXME the meaning of the "error" event is overloaded:
    //  - it can be sent by the client (`socket.emit("error")`)
    //  - it can be emitted when the connection encounters an error (an invalid packet for example)
    //  - it can be emitted when a packet is rejected in a middleware (`socket.use()`)
    this.emitReserved("error", err);
  }

  /**
   * Called upon closing. Called by `Client`.