Method ack

packages/socket.io-client/lib/socket.ts:785–800

* Produces an ack callback to emit with an event. * * @private

(id: number)

   * @private
   */
  private ack(id: number): (...args: any[]) => void {
    const self = this;
    let sent = false;
    return function (...args: any[]) {
      // prevent double callbacks
      if (sent) return;
      sent = true;
      debug("sending ack %j", args);

      self.packet({
        type: PacketType.ACK,
        id: id,
        data: args,
      });
    };
  }

  /**
   * Called upon a server acknowledgement.