@base-ui-components/react/esm/utils/owner.js

Base UI is a library of headless ('unstyled') React components and low-level hooks. You gain complete control over your app's CSS and accessibility features.

export function ownerDocument(node) {
  return node && node.ownerDocument || document;
}
export function ownerWindow(node) {
  const doc = ownerDocument(node);
  return doc.defaultView || window;
}