Function loadPackageMap

lib/internal/modules/package_map.js:230–254

* Load and parse the package map from a config path. * @param {string} configPath * @returns {PackageMap}

(configPath)

 * @returns {PackageMap}
 */
function loadPackageMap(configPath) {
  let content;
  try {
    content = fs.readFileSync(configPath);
  } catch (err) {
    const error = new ERR_PACKAGE_MAP_INVALID(configPath, 'failed to read');
    setOwnProperty(error, 'cause', err);
    throw error;
  }

  // Resolve symlinks so that stored paths match the realpath'd module paths
  // that Node.js uses during resolution.
  configPath = fs.realpathSync(configPath);

  let data;
  try {
    data = JSONParse(content);
  } catch (err) {
    const error = new ERR_PACKAGE_MAP_INVALID(configPath, `invalid JSON`);
    setOwnProperty(error, 'cause', err);
    throw error;
  }

  return new PackageMap(configPath, data);
}

/**
 * Get the singleton package map, initializing on first call.