Function sourceMapFromFile

lib/internal/source_map/source_map_cache.js:285–294

* Read source map from file. * @param {URL} mapURL - file url of the source map * @returns {object} deserialized source map JSON object

(mapURL)

 * @returns {object} deserialized source map JSON object
 */
function sourceMapFromFile(mapURL) {
  try {
    const content = readFileSync(fileURLToPath(mapURL), 'utf8');
    const data = JSONParse(content);
    return sourcesToAbsolute(mapURL, data);
  } catch (err) {
    debug(err);
    return null;
  }
}

// data:[<mediatype>][;base64],<data> see:
// https://tools.ietf.org/html/rfc2397#section-2