Method callback

packages/engine.io/lib/transports/polling.ts:191–199

(packet)

  override onData(data: RawData) {
    debug('received "%s"', data);
    const callback = (packet) => {
      if ("close" === packet.type) {
        debug("got xhr close packet");
        this.onClose();
        return false;
      }

      this.onPacket(packet);
    };

    if (this.protocol === 3) {
      (this.parser as typeof parser_v3).decodePayload(data, callback);