/*
  Copyright 2019 Google LLC

  Use of this source code is governed by an MIT-style
  license that can be found in the LICENSE file or at
  https://opensource.org/licenses/MIT.
*/

import {cacheNames} from 'workbox-core/_private/cacheNames.js';
import {logger} from 'workbox-core/_private/logger.js';
import {deleteOutdatedCaches} from './utils/deleteOutdatedCaches.js';
import './_version.js';


/**
 * Adds an `activate` event listener which will clean up incompatible
 * precaches that were created by older versions of Workbox.
 *
 * @memberof module:workbox-precaching
 */
function cleanupOutdatedCaches() {
  // See https://github.com/Microsoft/TypeScript/issues/28357#issuecomment-436484705
  self.addEventListener('activate', ((event: ExtendableEvent) => {
    const cacheName = cacheNames.getPrecacheName();

    event.waitUntil(deleteOutdatedCaches(cacheName).then((cachesDeleted) => {
      if (process.env.NODE_ENV !== 'production') {
        if (cachesDeleted.length > 0) {
          logger.log(`The following out-of-date precaches were cleaned up ` +
              `automatically:`, cachesDeleted);
        }
      }
    }));
  }) as EventListener);
}

export {cleanupOutdatedCaches}