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>
72 lines
2.9 KiB
Text
72 lines
2.9 KiB
Text
/**
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* @license
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* Copyright 2017 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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import {ByteEfficiencyAudit} from './byte-efficiency-audit.js';
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import {UnusedCSS} from '../../computed/unused-css.js';
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import * as i18n from '../../lib/i18n/i18n.js';
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const UIStrings = {
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/** Imperative title of a Lighthouse audit that tells the user to reduce content from their CSS that isn’t needed immediately and instead load that content at a later time. This is displayed in a list of audit titles that Lighthouse generates. */
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title: 'Reduce unused CSS',
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/** Description of a Lighthouse audit that tells the user *why* they should defer loading any content in CSS that isn’t needed at page load. This is displayed after a user expands the section to see more. No word length limits. The last sentence starting with 'Learn' becomes link text to additional documentation. */
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description: 'Reduce unused rules from stylesheets and defer CSS not used for ' +
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'above-the-fold content to decrease bytes consumed by network activity. ' +
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'[Learn how to reduce unused CSS](https://developer.chrome.com/docs/lighthouse/performance/unused-css-rules/).',
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};
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const str_ = i18n.createIcuMessageFn(import.meta.url, UIStrings);
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// Allow 10KiB of unused CSS to permit `:hover` and other styles not used on a non-interactive load.
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// @see https://github.com/GoogleChrome/lighthouse/issues/9353 for more discussion.
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const IGNORE_THRESHOLD_IN_BYTES = 10 * 1024;
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class UnusedCSSRules extends ByteEfficiencyAudit {
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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: 'unused-css-rules',
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title: str_(UIStrings.title),
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description: str_(UIStrings.description),
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scoreDisplayMode: ByteEfficiencyAudit.SCORING_MODES.METRIC_SAVINGS,
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guidanceLevel: 1,
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requiredArtifacts:
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['Stylesheets', 'CSSUsage', 'URL', 'DevtoolsLog', 'Trace', 'GatherContext', 'SourceMaps'],
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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.Artifacts.NetworkRequest[]} _
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* @param {LH.Audit.Context} context
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* @return {Promise<import('./byte-efficiency-audit.js').ByteEfficiencyProduct>}
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*/
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static async audit_(artifacts, _, context) {
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const unusedCssItems = await UnusedCSS.request({
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Stylesheets: artifacts.Stylesheets,
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CSSUsage: artifacts.CSSUsage,
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devtoolsLog: artifacts.DevtoolsLog,
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}, context);
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const items = unusedCssItems
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.filter(sheet => sheet && sheet.wastedBytes > IGNORE_THRESHOLD_IN_BYTES);
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/** @type {LH.Audit.Details.Opportunity['headings']} */
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const headings = [
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{key: 'url', valueType: 'url', label: str_(i18n.UIStrings.columnURL)},
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{key: 'totalBytes', valueType: 'bytes', label: str_(i18n.UIStrings.columnTransferSize)},
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{key: 'wastedBytes', valueType: 'bytes', label: str_(i18n.UIStrings.columnWastedBytes)},
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];
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return {
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items,
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headings,
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};
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}
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}
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export default UnusedCSSRules;
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export {UIStrings};
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