Function callback

packages/engine.io-client/lib/transports/polling.ts:84–98

(packet)

  override onData(data) {
    debug("polling got data %s", data);
    const callback = (packet) => {
      // if its the first message we consider the transport open
      if ("opening" === this.readyState && packet.type === "open") {
        this.onOpen();
      }

      // if its a close packet, we close the ongoing requests
      if ("close" === packet.type) {
        this.onClose({ description: "transport closed by the server" });
        return false;
      }

      // otherwise bypass onData and handle the message
      this.onPacket(packet);
    };

    // decode payload
    decodePayload(data, this.socket.binaryType).forEach(callback);