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>
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Copyright 2025 The Chromium Authors. All rights reserved.\n// Use of this source code is governed by a BSD-style license that can be\n// found in the LICENSE file.\n\nimport * as i18n from '../../../core/i18n/i18n.js';\nimport * as Protocol from '../../../generated/protocol.js';\nimport type * as Handlers from '../handlers/handlers.js';\nimport * as Helpers from '../helpers/helpers.js';\nimport type * as Types from '../types/types.js';\n\nimport {metricSavingsForWastedBytes} from './Common.js';\nimport {linearInterpolation} from './Statistics.js';\nimport {\n InsightCategory,\n type InsightModel,\n type InsightSetContext,\n type PartialInsightModel,\n} from './types.js';\n\nexport const UIStrings = {\n /**\n * @description Title of an insight that provides information and suggestions of resources that could improve their caching.\n */\n title: 'Use efficient cache lifetimes',\n /**\n * @description Text to tell the user about how caching can help improve performance.\n */\n description:\n 'A long cache lifetime can speed up repeat visits to your page. [Learn more](https://web.dev/uses-long-cache-ttl/).',\n /**\n * @description Column for a font loaded by the page to render text.\n */\n requestColumn: 'Request',\n /**\n * @description Column for a resource cache's Time To Live.\n */\n cacheTTL: 'Cache TTL',\n /**\n * @description Text describing that there were no requests found that need caching.\n */\n noRequestsToCache: 'No requests with inefficient cache policies',\n /**\n * @description Table row value representing the remaining items not shown in the table due to size constraints. This row will always represent at least 2 items.\n * @example {5} PH1\n */\n others: '{PH1} others',\n} as const;\n\nconst str_ = i18n.i18n.registerUIStrings('models/trace/insights/Cache.ts', UIStrings);\nexport const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);\n\nexport type CacheInsightModel = InsightModel<typeof UIStrings, {\n requests: Array<{\n request: Types.Events.SyntheticNetworkRequest,\n ttl: number,\n wastedBytes: number,\n }>,\n}>;\n\n// Threshold for cache hits.\nconst IGNORE_THRESHOLD_IN_PERCENT = 0.925;\n\nfunction finalize(partialModel: PartialInsightModel<CacheInsightModel>): CacheInsightModel {\n return {\n insightKey: 'Cache',\n strings: UIStrings,\n title: i18nString(UIStrings.title),\n description: i18nString(UIStrings.description),\n category: InsightCategory.ALL,\n state: partialModel.requests.length > 0 ? 'fail' : 'pass',\n ...partialModel,\n };\n}\n\n/**\n * Determines if a request is \"cacheable\".\n * A request is \"cacheable\" if it is of the appropriate protocol and resource type\n * (see Helpers.Network.NON_NETWORK_SCHEMES and Helpers.Network.STATIC_RESOURCE_TYPE)\n * and has the appropriate statusCodes.\n */\nexport function isCacheable(request: Types.Events.SyntheticNetworkRequest): boolean {\n // Caching doesn't make sense for requests not loaded over the network.\n if (Helpers.Network.NON_NETWORK_SCHEMES.includes(request.args.data.protocol)) {\n return false;\n }\n return Boolean(\n Helpers.Network.CACHEABLE_STATUS_CODES.has(request.args.data.statusCode) &&\n Helpers.Network.STATIC_RESOURCE_TYPES.has(request.args.data.resourceType || Protocol.Network.ResourceType.Other));\n}\n\n/**\n * Returns max-age if defined, otherwise expires header if defined, and null if not.\n */\nexport function computeCacheLifetimeInSeconds(\n headers: Array<{name: string, value: string}>, cacheControl: Helpers.Network.CacheControl|null): number|null {\n if (cacheControl?.['max-age'] !== undefined) {\n return cacheControl['max-age'];\n }\n\n const expiresHeaders = headers.find(h => h.name === 'expires')?.value ?? null;\n if (expiresHeaders) {\n const expires = new Date(expiresHeaders).getTime();\n // Treat expires values as having already expired.\n if (!expires) {\n return 0;\n }\n return Math.ceil((expires - Date.now()) / 1000);\n }\n return null;\n}\n\n/**\n * Computes the percent likelihood that a return visit will be within the cache lifetime, based on\n * historical Chrome UMA stats (see RESOURCE_AGE_IN_HOURS_DECILES comment).\n *\n * This function returns values on this curve: https://www.desmos.com/calculator/eaqiszhugy (but using seconds, rather than hours)\n * See http://github.com/GoogleChrome/lighthouse/pull/3531 for history.\n */\nfunction getCacheHitProbability(maxAgeInSeconds: number): number {\n // This array contains the hand wavy distribution of the age of a resource in hours at the time of\n // cache hit at 0th, 10th, 20th, 30th, etc percentiles. This is used to compute `wastedMs` since there\n // are clearly diminishing returns to cache duration i.e. 6 months is not 2x better than 3 months.\n // Based on UMA stats for HttpCache.StaleEntry.Validated.Age. see https://www.desmos.com/calculator/jjwc5mzuwd\n // This UMA data is from 2017 but the metric isn't tracked any longer in 2025.\n const RESOURCE_AGE_IN_HOURS_DECILES = [0, 0.2, 1, 3, 8, 12, 24, 48, 72, 168, 8760, Infinity];\n\n const maxAgeInHours = maxAgeInSeconds / 3600;\n const upperDecileIndex = RESOURCE_AGE_IN_HOURS_DECILES.findIndex(decile => decile >= maxAgeInHours);\n\n // Clip the likelihood between 0 and 1\n if (upperDecileIndex === RESOURCE_AGE_IN_HOURS_DECILES.length - 1) {\n return 1;\n }\n if (upperDecileIndex === 0) {\n return 0;\n }\n\n // Use the two closest decile points as control points\n const upperDecileValue = RESOURCE_AGE_IN_HOURS_DECILES[upperDecileIndex];\n const lowerDecileValue = RESOURCE_AGE_IN_HOURS_DECILES[upperDecileIndex - 1];\n const upperDecile = upperDecileIndex / 10;\n const lowerDecile = (upperDecileIndex - 1) / 10;\n\n // Approximate the real likelihood with linear interpolation\n return linearInterpolation(lowerDecileValue, lowerDecile, upperDecileValue, upperDecile, maxAgeInHours);\n}\n\nexport function getCombinedHeaders(responseHeaders: Array<{name: string, value: string}>): Map<string, string> {\n const headers = new Map<string, string>();\n for (const header of responseHeaders) {\n const name = header.name.toLowerCase();\n if (headers.get(name)) {\n headers.set(name, `${headers.get(name)}, ${header.value}`);\n } else {\n headers.set(name, header.value);\n }\n }\n return headers;\n}\n\n/**\n * Returns whether a request contains headers that disable caching.\n * Disabled caching is checked on the 'cache-control' and 'pragma' headers.\n */\nexport function cachingDisabled(\n headers: Map<string, string>|null, parsedCacheControl: Helpers.Network.CacheControl|null): boolean {\n const cacheControl = headers?.get('cache-control') ?? null;\n const pragma = headers?.get('pragma') ?? null;\n\n // The HTTP/1.0 Pragma header can disable caching if cache-control is not set, see https://tools.ietf.org/html/rfc7234#section-5.4\n if (!cacheControl && pragma?.includes('no-cache')) {\n return true;\n }\n\n // If we have any of these, the user intentionally doesn't want to cache.\n if (parsedCacheControl &&\n (parsedCacheControl['must-revalidate'] || parsedCacheControl['no-cache'] || parsedCacheControl['no-store'] ||\n parsedCacheControl['private'])) {\n return true;\n }\n\n return false;\n}\n\nexport interface CacheableRequest {\n request: Types.Events.SyntheticNetworkRequest;\n ttl: number;\n wastedBytes: number;\n}\n\nexport function generateInsight(\n parsedTrace: Handlers.Types.ParsedTrace, context: InsightSetContext): CacheInsightModel {\n const isWithinContext = (event: Types.Events.Event): boolean => Helpers.Timing.eventIsInBounds(event, context.bounds);\n const contextRequests = parsedTrace.NetworkRequests.byTime.filter(isWithinContext);\n\n const results: CacheableRequest[] = [];\n let totalWastedBytes = 0;\n const wastedBytesByRequestId = new Map<string, number>();\n for (const req of contextRequests) {\n if (!req.args.data.responseHeaders || !isCacheable(req)) {\n continue;\n }\n\n const headers = getCombinedHeaders(req.args.data.responseHeaders);\n const cacheControl = headers.get('cache-control') ?? 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