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/** * @license * Copyright 2016 Google LLC * SPDX-License-Identifier: Apache-2.0 */ import {Audit} from '../audit.js'; import * as i18n from '../../lib/i18n/i18n.js'; import {SpeedIndex as ComputedSi} from '../../computed/metrics/speed-index.js'; const UIStrings = { /** Description of the Speed Index metric, which summarizes how quickly the page looked visually complete. This is displayed within a tooltip when the user hovers on the metric name to see more. No character length limits. The last sentence starting with 'Learn' becomes link text to additional documentation. */ description: 'Speed Index shows how quickly the contents of a page are visibly populated. ' + '[Learn more about the Speed Index metric](https://developer.chrome.com/docs/lighthouse/performance/speed-index/).', }; const str_ = i18n.createIcuMessageFn(import.meta.url, UIStrings); class SpeedIndex extends Audit { /** * @return {LH.Audit.Meta} */ static get meta() { return { id: 'speed-index', title: str_(i18n.UIStrings.speedIndexMetric), description: str_(UIStrings.description), scoreDisplayMode: Audit.SCORING_MODES.NUMERIC, supportedModes: ['navigation'], requiredArtifacts: ['traces', 'devtoolsLogs', 'GatherContext', 'URL'], }; } /** * @return {{mobile: {scoring: LH.Audit.ScoreOptions}, desktop: {scoring: LH.Audit.ScoreOptions}}} */ static get defaultOptions() { return { mobile: { // 25th and 5th percentiles HTTPArchive -> median and PODR, then p10 derived from them. // https://bigquery.cloud.google.com/table/httparchive:lighthouse.2018_04_01_mobile?pli=1 // see https://www.desmos.com/calculator/dvuzvpl7mi scoring: { p10: 3387, median: 5800, }, }, desktop: { // SELECT QUANTILES(SpeedIndex, 21) FROM [httparchive:summary_pages.2018_12_15_desktop] LIMIT 1000 scoring: { p10: 1311, median: 2300, }, }, }; } /** * Audits the page to give a score for the Speed Index. * @see https://github.com/GoogleChrome/lighthouse/issues/197 * @param {LH.Artifacts} artifacts The artifacts from the gather phase. * @param {LH.Audit.Context} context * @return {Promise} */ static async audit(artifacts, context) { const trace = artifacts.traces[Audit.DEFAULT_PASS]; const devtoolsLog = artifacts.devtoolsLogs[Audit.DEFAULT_PASS]; const gatherContext = artifacts.GatherContext; const metricComputationData = {trace, devtoolsLog, gatherContext, settings: context.settings, URL: artifacts.URL}; const metricResult = await ComputedSi.request(metricComputationData, context); const options = context.options[context.settings.formFactor]; return { score: Audit.computeLogNormalScore( options.scoring, metricResult.timing ), scoringOptions: options.scoring, numericValue: metricResult.timing, numericUnit: 'millisecond', displayValue: str_(i18n.UIStrings.seconds, {timeInMs: metricResult.timing}), }; } } export default SpeedIndex; export {UIStrings};