# all files / src/audits/performance/ screenshots.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');
    const Formatter = require('../../../formatters/formatter');

    class Screenshots extends Audit {
      /**
       * @override
       */
      static get meta() {
        return {
          category: 'Performance',
          name: 'screenshots',
          description: 'Screenshots of all captured frames',
          requiredArtifacts: ['screenshots']
        };
      }

      /**
       * @param {!Artifacts} artifacts
       * @return {!AuditResultInput}
       */
      static audit(artifacts) {
        const screenshots = artifacts.screenshots;

        if (typeof artifacts.screenshots === 'undefined') {
          return Screenshots.generateAuditResult({
            value: -1,
            debugString: 'No screenshot artifact'
          });
        }

        return Screenshots.generateAuditResult({
          value: screenshots.length || 0,
          extendedInfo: {
            formatter: Formatter.SUPPORTED_FORMATS.NULL,
            value: screenshots
          }
        });
      }
    }

    module.exports = Screenshots;