// @ts-nocheck
import getNodeName from './getNodeName';
import getDocumentElement from './getDocumentElement';

/**
 * @param element
 */
export default function getParentNode(element: Node | ShadowRoot): Node {
  if (getNodeName(element) === 'html') {
    return element;
  }

  return (
    // $FlowFixMe: this is a quicker (but less type safe) way to save quite some bytes from the bundle
    element.assignedSlot || // step into the shadow DOM of the parent of a slotted node
    element.parentNode || // DOM Element detected
    // $FlowFixMe: need a better way to handle this...
    element.host || // ShadowRoot detected
    // $FlowFixMe: HTMLElement is a Node
    getDocumentElement(element) // fallback
  );
}