First time using mutation observer, tried to add disconnect() but seems not working. Need some advice. Thanks.

const cbMutate = (mList) => {
  mList.forEach(
    (rec) => {
      if (jQuery('.item2').length === 1) {
        changeItem();
      }
    }
  );
}

const obsTargetEl = new MutationObserver(cbMutate);
obsTargetEl.observe(targetEl, {
  attributes: true,
  childList: true,
  subtree: true
});````