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;