RTCIceTransport: событие gatheringstatechange

addEventListener("gatheringstatechange", (event) => {});

ongatheringstatechange = (event) => {};

pc.getSenders().forEach((sender) => {
  sender.transport.iceTransport.addEventListener(
    "gatheringstatechange",
    (ev) => {
      let transport = ev.target;

      if (transport.gatheringState === "complete") {
        /* this transport has finished gathering candidates,
        but others may still be working on it */
      }
    },
    false,
  );
});

pc.getSenders().forEach((sender) => {
  sender.transport.iceTransport.ongatheringstatechange = (ev) => {
    let transport = ev.target;

    if (transport.gatheringState === "complete") {
      /* this transport has finished gathering candidates,
         but others may still be working on it */
    }
  };
});