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>
89 lines
3.3 KiB
Text
89 lines
3.3 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 {NetworkRecords} from '../computed/network-records.js';
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import {NetworkAnalysis} from '../computed/network-analysis.js';
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const UIStrings = {
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/** Descriptive title of a Lighthouse audit that tells the user the server latencies observed from each origin the page connected to. This is displayed in a list of audit titles that Lighthouse generates. */
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title: 'Server Backend Latencies',
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/** Description of a Lighthouse audit that tells the user that server latency can effect their website's performance negatively. This is displayed after a user expands the section to see more. No character length limits. The last sentence starting with 'Learn' becomes link text to additional documentation. */
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description: 'Server latencies can impact web performance. ' +
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'If the server latency of an origin is high, it\'s an indication the server is overloaded ' +
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'or has poor backend performance. [Learn more about server response time](https://hpbn.co/primer-on-web-performance/#analyzing-the-resource-waterfall).',
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};
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const str_ = i18n.createIcuMessageFn(import.meta.url, UIStrings);
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class NetworkServerLatency 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: 'network-server-latency',
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scoreDisplayMode: Audit.SCORING_MODES.INFORMATIVE,
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title: str_(UIStrings.title),
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description: str_(UIStrings.description),
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requiredArtifacts: ['DevtoolsLog'],
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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 devtoolsLog = artifacts.DevtoolsLog;
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const records = await NetworkRecords.request(devtoolsLog, context);
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if (!records.length) {
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return {
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score: 1,
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notApplicable: true,
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};
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}
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const analysis = await NetworkAnalysis.request(devtoolsLog, context);
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/** @type {number} */
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let maxLatency = 0;
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/** @type {Array<{origin: string, serverResponseTime: number}>} */
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const results = [];
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for (const [origin, serverResponseTime] of analysis.serverResponseTimeByOrigin.entries()) {
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// Ignore entries that don't look like real origins, like the __SUMMARY__ entry.
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if (!origin.startsWith('http')) continue;
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maxLatency = Math.max(serverResponseTime, maxLatency);
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results.push({origin, serverResponseTime});
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}
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results.sort((a, b) => b.serverResponseTime - a.serverResponseTime);
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/** @type {LH.Audit.Details.Table['headings']} */
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const headings = [
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{key: 'origin', valueType: 'text', label: str_(i18n.UIStrings.columnURL)},
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{key: 'serverResponseTime', valueType: 'ms', granularity: 1,
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label: str_(i18n.UIStrings.columnTimeSpent)},
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];
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const tableDetails = Audit.makeTableDetails(headings, results,
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{sortedBy: ['serverResponseTime']});
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return {
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score: Math.max(1 - (maxLatency / 500), 0),
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numericValue: maxLatency,
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numericUnit: 'millisecond',
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displayValue: str_(i18n.UIStrings.ms, {timeInMs: maxLatency}),
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details: tableDetails,
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};
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}
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}
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export default NetworkServerLatency;
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export {UIStrings};
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