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no-datenow.js
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no-datenow.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.
*/
/**
* @fileoverview Audit a page to see if it's using Date.now() (instead of a
* newer API like performance.now()).
*/
'use strict';
const URL = require('../../lib/url-shim');
const Audit = require('../audit');
const Formatter = require('../../formatters/formatter');
class NoDateNowAudit extends Audit {
/**
* @return {!AuditMeta}
*/
static get meta() {
return {
category: 'JavaScript',
name: 'no-datenow',
description: 'Avoids `Date.now()` in its own scripts',
helpText: 'Consider using `performance.now()` from the User Timing API ' +
'instead. It provides high-precision timestamps, independent of the system ' +
'clock. [Learn more](https://developers.google.com/web/tools/lighthouse/audits/date-now).',
requiredArtifacts: ['URL', 'DateNowUse']
};
}
/**
* @param {!Artifacts} artifacts
* @return {!AuditResult}
*/
static audit(artifacts) {
let debugString;
// Filter usage from other hosts and keep eval'd code.
const results = artifacts.DateNowUse.filter(err => {
if (err.isEval) {
return !!err.url;
}
if (URL.isValid(err.url)) {
return URL.hostsMatch(artifacts.URL.finalUrl, err.url);
}
// If the violation doesn't have a valid url, don't filter it out, but
// warn the user that we don't know what the callsite is.
debugString = URL.INVALID_URL_DEBUG_STRING;
return true;
});
return NoDateNowAudit.generateAuditResult({
rawValue: results.length === 0,
extendedInfo: {
formatter: Formatter.SUPPORTED_FORMATS.TABLE,
value: {
results,
tableHeadings: {url: 'URL', lineCol: 'Line/Col', isEval: 'Eval\'d?'}
}
},
debugString
});
}
}
module.exports = NoDateNowAudit;