Function parseXhrUrlArg

packages/browser-utils/src/instrument/xhr.ts:165–177

* Parses the URL argument of a XHR method to a string. * * See: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/open#url * url: A string or any other object with a stringifier — including a URL object — that provides the URL of the resource to send the request to. * * @param url

(url: unknown)

 * @returns The parsed URL string or undefined if the URL is invalid
 */
function parseXhrUrlArg(url: unknown): string | undefined {
  if (isString(url)) {
    return url;
  }

  try {
    // If the passed in argument is not a string, it should have a `toString` method as a stringifier.
    // If that fails, we just return undefined (like in IE11 where URL is not available)
    return (url as URL).toString();
  } catch {} // eslint-disable-line no-empty

  return undefined;
}