ocument} document
 * @returns {string|null}
 */
function getJSONLDUrl(document) {
  const firstMatch = Array.from(
    document.querySelectorAll('script[type="application/ld+json"]')
  )
    .map(script => {
      try {
        return JSON.parse(script.textContent);
      } catch {
        return null;
      }
    })
    .find(obj => obj && obj.url && typeof obj.url === "string");
  return firstMatch?.url;
}

/**
 * @param {Document} document
 * @returns {string|null}
 */
function getFallbackCanonicalUrl(document) {
  const fallbackUrl = URL.parse(document.documentURI);
  if (fallbackUrl) {
    fallbackUrl.hash = "";
    return fallbackUrl.toString();
  }
  return null;
}
PK