lib/jsdom/living/helpers/shadow-dom.js
function signalSlotChange(slot) {
  if (!signalSlotList.some(entry => entry === slot)) {
    signalSlotList.push(slot);
  }

  queueMutationObserverMicrotask();
}
function signalSlotChange(slot) {
  if (!signalSlotList.some(entry => entry === slot)) {
    signalSlotList.push(slot);
  }

  queueMutationObserverMicrotask();
}
function signalSlotChange ( slot ) { if ( ! signalSlotList . some ( entry => entry === slot ) ) { signalSlotList . push ( slot ) ; } queueMutationObserverMicrotask ( ) ; }
https://dom.spec.whatwg.org/#signal-a-slot-change
https : // dom . spec . whatwg . org / #signal - a - slot - change