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>
116 lines
4.2 KiB
Text
116 lines
4.2 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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import {computeCSSTokenLength as computeTokenLength} from '../../lib/minification-estimator.js';
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import {estimateTransferSize} from '../../lib/script-helpers.js';
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const UIStrings = {
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/** Imperative title of a Lighthouse audit that tells the user to minify (remove whitespace) the page's CSS code. This is displayed in a list of audit titles that Lighthouse generates. */
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title: 'Minify CSS',
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/** Description of a Lighthouse audit that tells the user *why* they should minify (remove whitespace) the page's CSS code. 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: 'Minifying CSS files can reduce network payload sizes. ' +
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'[Learn how to minify CSS](https://developer.chrome.com/docs/lighthouse/performance/unminified-css/).',
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};
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const str_ = i18n.createIcuMessageFn(import.meta.url, UIStrings);
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const IGNORE_THRESHOLD_IN_PERCENT = 5;
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const IGNORE_THRESHOLD_IN_BYTES = 2048;
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/**
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* @fileOverview
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*/
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class UnminifiedCSS 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: 'unminified-css',
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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: 3,
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requiredArtifacts: ['Stylesheets', 'DevtoolsLog', 'Trace', 'URL', 'GatherContext',
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'SourceMaps'],
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};
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}
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/**
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* Computes the total length of the meaningful tokens (CSS excluding comments and whitespace).
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*
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* @param {string} content
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* @return {number}
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*/
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static computeTokenLength(content) {
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return computeTokenLength(content);
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}
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/**
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* @param {LH.Artifacts.CSSStyleSheetInfo} stylesheet
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* @param {LH.Artifacts.NetworkRequest|undefined} networkRecord
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* @return {{url: string, totalBytes: number, wastedBytes: number, wastedPercent: number}}
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*/
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static computeWaste(stylesheet, networkRecord) {
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const content = stylesheet.content;
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const totalTokenLength = UnminifiedCSS.computeTokenLength(content);
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let url = stylesheet.header.sourceURL;
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if (!url || stylesheet.header.isInline) {
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const contentPreview = UnusedCSS.determineContentPreview(stylesheet.content);
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url = contentPreview;
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}
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const totalBytes = estimateTransferSize(networkRecord, content.length, 'Stylesheet');
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const wastedRatio = 1 - totalTokenLength / content.length;
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const wastedBytes = Math.round(totalBytes * wastedRatio);
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return {
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url,
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totalBytes,
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wastedBytes,
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wastedPercent: 100 * wastedRatio,
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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 {Array<LH.Artifacts.NetworkRequest>} networkRecords
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* @return {import('./byte-efficiency-audit.js').ByteEfficiencyProduct}
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*/
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static audit_(artifacts, networkRecords) {
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const items = [];
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for (const stylesheet of artifacts.Stylesheets) {
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const networkRecord = networkRecords
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.find(record => record.url === stylesheet.header.sourceURL);
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if (!stylesheet.content) continue;
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const result = UnminifiedCSS.computeWaste(stylesheet, networkRecord);
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// If the ratio is minimal, the file is likely already minified, so ignore it.
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// If the total number of bytes to be saved is quite small, it's also safe to ignore.
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if (result.wastedPercent < IGNORE_THRESHOLD_IN_PERCENT ||
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result.wastedBytes < IGNORE_THRESHOLD_IN_BYTES ||
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!Number.isFinite(result.wastedBytes)) continue;
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items.push(result);
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}
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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 {items, headings};
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}
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}
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export default UnminifiedCSS;
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export {UIStrings};
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