Function urlJoinWithRelative

common-src/StringUtils.js:129–141

(baseUrl, path, baseUrlForRelativePath = '/')

 * 2) Relative url to cdn (r2), e.g., production/something.png
 */
export function urlJoinWithRelative(baseUrl, path, baseUrlForRelativePath = '/') {
  if (!path) {
    return null;
  }

  if (path.startsWith('/')) {
    return urlJoin(baseUrlForRelativePath, path);
  }
  if (baseUrl) {
    return urlJoin(baseUrl, path);
  }
  return urlJoin('/', path);
}

export function buildAudioUrlWithTracking(audioUrl, trackingUrls, protocal='https') {
  if (!audioUrl) {