# all files / src/audits/offline/ service-worker.js

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     /**
     * @license
     * Copyright 2016 Google Inc. All rights reserved.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    'use strict';

    const Audit = require('../audit');

    class ServiceWorker extends Audit {
      /**
       * @override
       */
      static get meta() {
        return {
          category: 'Offline',
          name: 'service-worker',
          description: 'Has a registered Service Worker',
          requiredArtifacts: ['serviceWorkers']
        };
      }

      /**
       * @param {!Artifacts} artifacts
       * @return {!AuditResult}
       */
      static audit(artifacts) {
        if (!artifacts.serviceWorkers ||
            !artifacts.serviceWorkers.versions) {
          return ServiceWorker.generateAuditResult({value: false});
        }

        const activatedRegistrations = artifacts.serviceWorkers.versions;

        return ServiceWorker.generateAuditResult({
          value: activatedRegistrations.length > 0
        });
      }
    }

    module.exports = ServiceWorker;