Function extractSourceMapURLMagicComment

lib/internal/source_map/source_map_cache.js:131–143

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

(content)

 * @returns {string | null} source map url or null if not present
 */
function extractSourceMapURLMagicComment(content) {
  let match;
  let lastMatch;
  // A while loop is used here to get the last occurrence of sourceMappingURL.
  // This is needed so that we don't match sourceMappingURL in string literals.
  while ((match = RegExpPrototypeExec(kSourceMappingURLMagicComment, content))) {
    lastMatch = match;
  }
  if (lastMatch == null) {
    return null;
  }
  return lastMatch.groups.sourceMappingURL;
}

/**
 * Caches the source map, with the given filename, moduleInstance, sourceURL and sourceMapURL.