Function getOriginalSource

lib/internal/source_map/source_map_cache.js:415–436

* Retrieve the original source code from the source map's `sources` list or disk. * @param {import('internal/source_map/source_map').SourceMap.payload} payload * @param {string} originalSourcePath - path or url of the original source * @returns {string | undefined} - the source content or undefin

(payload, originalSourcePath)

 * @returns {string | undefined} - the source content or undefined if file not found
 */
function getOriginalSource(payload, originalSourcePath) {
  let source;
  // payload.sources has been normalized to be an array of absolute urls.
  const sourceContentIndex =
    ArrayPrototypeIndexOf(payload.sources, originalSourcePath);
  if (payload.sourcesContent?.[sourceContentIndex]) {
    // First we check if the original source content was provided in the
    // source map itself:
    source = payload.sourcesContent[sourceContentIndex];
  } else if (StringPrototypeStartsWith(originalSourcePath, 'file://')) {
    // If no sourcesContent was found, attempt to load the original source
    // from disk:
    debug(`read source of ${originalSourcePath} from filesystem`);
    const originalSourcePathNoScheme = fileURLToPath(originalSourcePath);
    try {
      source = readFileSync(originalSourcePathNoScheme, 'utf8');
    } catch (err) {
      debug(err);
    }
  }
  return source;
}

/**
 * Get the line of source in the source map.