Function extractSourceURLMagicComment

lib/internal/source_map/source_map_cache.js:105–121

* Extracts the source url from the content if present. For example * //# sourceURL=file:///path/to/file * * Read more at: https://tc39.es/source-map-spec/#linking-evald-code-to-named-generated-code * @param {string} content - source content * @returns {string | null} source url or null if not p

(content)

 * @returns {string | null} source url or null if not present
 */
function extractSourceURLMagicComment(content) {
  let match;
  let matchSourceURL;
  // A while loop is used here to get the last occurrence of sourceURL.
  // This is needed so that we don't match sourceURL in string literals.
  while ((match = RegExpPrototypeExec(kSourceURLMagicComment, content))) {
    matchSourceURL = match;
  }
  if (matchSourceURL == null) {
    return null;
  }
  let sourceURL = matchSourceURL.groups.sourceURL;
  if (sourceURL != null && RegExpPrototypeExec(kLeadingProtocol, sourceURL) === null) {
    sourceURL = pathToFileURL(sourceURL).href;
  }
  return sourceURL;
}

/**
 * Extracts the source map url from the content if present. For example