Function normalizeSourceMap

src/utils.js:734–765

* @param {RawSourceMap} map source map * @param {string} rootContext root context * @returns {RawSourceMap} normalized source map

(map, rootContext)

 * @returns {RawSourceMap} normalized source map
 */
function normalizeSourceMap(map, rootContext) {
  const newMap = map;

  // result.map.file is an optional property that provides the output filename.
  // Since we don't know the final filename in the webpack build chain yet, it makes no sense to have it.

  if (typeof newMap.file !== "undefined") {
    // @ts-expect-error need to fix on webpack side
    delete newMap.file;
  }

  newMap.sourceRoot = "";

  // sass returns POSIX paths, that's why we need to transform them back to native paths.
  // This fixes an error on windows where the source-map module cannot resolve the source maps.
  // @see https://github.com/webpack/sass-loader/issues/366#issuecomment-279460722

  newMap.sources = newMap.sources.map((/** @type {string} */ source) => {
    const sourceType = getURLType(source);

    // Do no touch `scheme-relative`, `path-absolute` and `absolute` types (except `file:`)
    if (sourceType === "absolute" && /^file:/i.test(source)) {
      return url.fileURLToPath(source);
    } else if (sourceType === "path-relative") {
      return path.resolve(rootContext, path.normalize(source));
    }

    return source;
  });

  return newMap;
}

/**
 * @param {Error | SassError} error the original sass error