Function findPackageJSON

lib/internal/modules/package_json_reader.js:311–354

* @param {string | URL} specifier The location for which to get the "root" package.json * @param {string | URL} [base] The location of the current module (ex file://tmp/foo.js). * @returns {string}

(specifier, base = 'data:')

 * @returns {string}
 */
function findPackageJSON(specifier, base = 'data:') {
  if (arguments.length === 0) {
    throw new ERR_MISSING_ARGS('specifier');
  }
  try {
    specifier = `${specifier}`;
  } catch {
    validateString(specifier, 'specifier');
  }

  let parentURL = base;
  if (!isURL(base)) {
    validateString(base, 'base');
    parentURL = path.isAbsolute(base) ? pathToFileURL(base) : new URL(base);
  }

  if (specifier && specifier[0] !== '.' && specifier[0] !== '/' && !URLCanParse(specifier)) {
    // If `specifier` is a bare specifier.
    const { packageJSONPath } = getPackageJSONURL(specifier, parentURL);
    return packageJSONPath;
  }

  let resolvedTarget;
  defaultResolve ??= require('internal/modules/esm/resolve').defaultResolve;

  try {
    // TODO(@JakobJingleheimer): Detect whether findPackageJSON is being used within a loader
    // (possibly piggyback on `isForAsyncLoaderHookWorker` from the loader?) and if so:
    // - When inside, use the default resolve
    //   - (I think it's impossible to use the chain because of re-entry & a deadlock from atomics).
    // - When outside, use cascadedLoader.resolveSync (not implemented yet, but the pieces exist).
    resolvedTarget = defaultResolve(specifier, { parentURL: `${parentURL}` }).url;
  } catch (err) {
    if (err.code === 'ERR_UNSUPPORTED_DIR_IMPORT') {
      resolvedTarget = err.url;
    } else {
      throw err;
    }
  }

  const pkg = getNearestParentPackageJSON(fileURLToPath(resolvedTarget));

  return pkg?.path;
}

module.exports = {
  read,