Function close

packages/engine.io/lib/transport.ts:121–126

* Closes the transport. * * @package

(fn?: () => void)

   * @package
   */
  close(fn?: () => void) {
    if ("closed" === this.readyState || "closing" === this.readyState) return;

    this.readyState = "closing";
    this.doClose(fn || noop);
  }

  /**
   * Called with a transport error.