/**

* @license Copyright 2023 The Lighthouse Authors. 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.

*/

import {Audit} from 'lighthouse';

class CatAudit extends Audit {

static get meta() {

return {

id: 'has-cat-images-id',

title: 'Page has least one cat image',

failureTitle: 'Page does not have at least one cat image',

description:

'Pages should have lots of cat images to keep users happy. ' +

'Consider adding a picture of a cat to your page improve engagement.',

requiredArtifacts: ['ImageElements'],

};

}

static audit(artifacts) {

// Artifacts requested in `requiredArtifacts` above are passed to your audit.

// See the "API -> Plugin Audits" section below for what artifacts are available.

const images = artifacts.ImageElements;

const catImages = images.filter(image => image.src.toLowerCase().includes('cat'));

return {

// Give users a 100 if they had a cat image, 0 if they didn't.

score: catImages.length > 0 ? 1 : 0,

// Also return the total number of cat images that can be used by report JSON consumers.

numericValue: catImages.length,

};

}

}

export default CatAudit;