DMleadgen
46d973904b
Next.js website for Rocky Mountain Vending company featuring: - Product catalog with Stripe integration - Service areas and parts pages - Admin dashboard with Clerk authentication - SEO optimized pages with JSON-LD structured data Co-authored-by: Cursor <cursoragent@cursor.com>
99 lines
3.5 KiB
Text
99 lines
3.5 KiB
Text
/**
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* @license
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* Copyright 2019 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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import {Audit} from '../audit.js';
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import * as i18n from '../../lib/i18n/i18n.js';
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import {LargestContentfulPaint as ComputedLcp} from '../../computed/metrics/largest-contentful-paint.js';
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const UIStrings = {
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/** Description of the Largest Contentful Paint (LCP) metric, which marks the time at which the largest text or image is painted by the browser. 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. */
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description: 'Largest Contentful Paint marks the time at which the largest text or image is ' +
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`painted. [Learn more about the Largest Contentful Paint metric](https://developer.chrome.com/docs/lighthouse/performance/lighthouse-largest-contentful-paint/)`,
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};
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const str_ = i18n.createIcuMessageFn(import.meta.url, UIStrings);
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class LargestContentfulPaint extends Audit {
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/**
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* @return {LH.Audit.Meta}
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*/
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static get meta() {
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return {
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id: 'largest-contentful-paint',
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title: str_(i18n.UIStrings.largestContentfulPaintMetric),
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description: str_(UIStrings.description),
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scoreDisplayMode: Audit.SCORING_MODES.NUMERIC,
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supportedModes: ['navigation'],
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requiredArtifacts: ['HostUserAgent', 'Trace', 'DevtoolsLog', 'GatherContext', 'URL',
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'SourceMaps'],
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};
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}
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/**
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* @return {{mobile: {scoring: LH.Audit.ScoreOptions}, desktop: {scoring: LH.Audit.ScoreOptions}}}
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*/
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static get defaultOptions() {
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return {
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mobile: {
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// 25th and 13th percentiles HTTPArchive -> median and p10 points.
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// https://bigquery.cloud.google.com/table/httparchive:lighthouse.2020_02_01_mobile?pli=1
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// https://web.dev/articles/lcp#what_is_a_good_lcp_score
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// see https://www.desmos.com/calculator/1etesp32kt
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scoring: {
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p10: 2500,
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median: 4000,
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},
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},
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desktop: {
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// 25th and 5th percentiles HTTPArchive -> median and p10 points.
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// SELECT
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// APPROX_QUANTILES(lcpValue, 100)[OFFSET(5)] AS p05_lcp,
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// APPROX_QUANTILES(lcpValue, 100)[OFFSET(25)] AS p25_lcp
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// FROM (
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// SELECT CAST(JSON_EXTRACT_SCALAR(payload, "$['_chromeUserTiming.LargestContentfulPaint']") AS NUMERIC) AS lcpValue
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// FROM `httparchive.pages.2020_04_01_desktop`
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// )
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scoring: {
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p10: 1200,
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median: 2400,
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},
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},
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};
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}
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/**
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* @param {LH.Artifacts} artifacts
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* @param {LH.Audit.Context} context
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* @return {Promise<LH.Audit.Product>}
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*/
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static async audit(artifacts, context) {
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const trace = artifacts.Trace;
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const devtoolsLog = artifacts.DevtoolsLog;
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const gatherContext = artifacts.GatherContext;
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const metricComputationData = {
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trace, devtoolsLog, gatherContext,
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settings: context.settings, URL: artifacts.URL,
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SourceMaps: artifacts.SourceMaps, simulator: null,
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};
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const metricResult = await ComputedLcp.request(metricComputationData, context);
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const options = context.options[context.settings.formFactor];
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return {
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score: Audit.computeLogNormalScore(
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options.scoring,
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metricResult.timing
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),
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scoringOptions: options.scoring,
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numericValue: metricResult.timing,
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numericUnit: 'millisecond',
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displayValue: str_(i18n.UIStrings.seconds, {timeInMs: metricResult.timing}),
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};
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}
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}
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export default LargestContentfulPaint;
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export {UIStrings};
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