/**
 * Copyright (c) 2015-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

'use strict';

module.exports = function getCacheIdentifier(environment, packages) {
  let cacheIdentifier = environment == null ? '' : environment.toString();
  for (const packageName of packages) {
    cacheIdentifier += `:${packageName}@`;
    try {
      cacheIdentifier += require(`${packageName}/package.json`).version;
    } catch (_) {
      // ignored
    }
  }
  return cacheIdentifier;
};