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>
108 lines
3.7 KiB
Text
108 lines
3.7 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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/*
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* @fileoverview Audit a page to ensure that resources loaded with
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* gzip/br/deflate compression.
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*/
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import {ByteEfficiencyAudit} from './byte-efficiency-audit.js';
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import UrlUtils from '../../lib/url-utils.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 enable text compression (like gzip) in order to enhance the performance of a page. This is displayed in a list of audit titles that Lighthouse generates. */
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title: 'Enable text compression',
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/** Description of a Lighthouse audit that tells the user *why* their text-based resources should be served with compression (like gzip). 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: 'Text-based resources should be served with compression (gzip, deflate or' +
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' brotli) to minimize total network bytes.' +
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' [Learn more about text compression](https://developer.chrome.com/docs/lighthouse/performance/uses-text-compression/).',
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};
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const str_ = i18n.createIcuMessageFn(import.meta.url, UIStrings);
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const IGNORE_THRESHOLD_IN_BYTES = 1400;
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const IGNORE_THRESHOLD_IN_PERCENT = 0.1;
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class ResponsesAreCompressed 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: 'uses-text-compression',
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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: ['ResponseCompression', 'GatherContext', 'DevtoolsLog', 'Trace', 'URL',
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'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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* @return {import('./byte-efficiency-audit.js').ByteEfficiencyProduct}
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*/
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static audit_(artifacts) {
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const uncompressedResponses = artifacts.ResponseCompression;
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/** @type {Array<LH.Audit.ByteEfficiencyItem>} */
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const items = [];
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uncompressedResponses.forEach(record => {
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// Ignore invalid GZIP size values (undefined, NaN, 0, -n, etc)
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if (!record.gzipSize || record.gzipSize < 0) return;
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const originalSize = record.resourceSize;
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const gzipSize = record.gzipSize;
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const gzipSavings = originalSize - gzipSize;
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// Not every resource is smaller when compressed.
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if (record.transferSize < gzipSize) {
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return;
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}
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// If savings is small, let's be generous and not surface the minor savings.
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if (gzipSavings < IGNORE_THRESHOLD_IN_BYTES) {
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return;
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}
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// Require at least 20kb of savings ... or some percentage of total resource size.
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if (gzipSavings < 20_000 && 1 - gzipSize / originalSize < IGNORE_THRESHOLD_IN_PERCENT) {
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return;
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}
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// remove duplicates
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const url = UrlUtils.elideDataURI(record.url);
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const isDuplicate = items.find(item => item.url === url &&
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item.totalBytes === record.resourceSize);
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if (isDuplicate) {
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return;
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}
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items.push({
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url,
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totalBytes: originalSize,
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wastedBytes: gzipSavings,
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});
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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 {
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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 ResponsesAreCompressed;
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export {UIStrings};
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