/*
  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 workbox-precaching
 */
function cleanupOutdatedCaches(): void {
  // 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              `The following out-of-date precaches were cleaned up ` +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};