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 2024 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 type * as Handlers from '../handlers/handlers.js';\nimport * as Helpers from '../helpers/helpers.js';\nimport * as Types from '../types/types.js';\n\nimport {isRequestCompressed} from './Common.js';\nimport {\n type Checklist,\n InsightCategory,\n InsightKeys,\n type InsightModel,\n type InsightSetContext,\n InsightWarning,\n type PartialInsightModel,\n} from './types.js';\n\nexport const UIStrings = {\n /**\n * @description Title of an insight that provides a breakdown for how long it took to download the main document.\n */\n title: 'Document request latency',\n /**\n * @description Description of an insight that provides a breakdown for how long it took to download the main document.\n */\n description:\n 'Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.',\n /**\n * @description Text to tell the user that the document request does not have redirects.\n */\n passingRedirects: 'Avoids redirects',\n /**\n * @description Text to tell the user that the document request had redirects.\n * @example {3} PH1\n * @example {1000 ms} PH2\n */\n failedRedirects: 'Had redirects ({PH1} redirects, +{PH2})',\n /**\n * @description Text to tell the user that the time starting the document request to when the server started responding is acceptable.\n * @example {600 ms} PH1\n */\n passingServerResponseTime: 'Server responds quickly (observed {PH1})',\n /**\n * @description Text to tell the user that the time starting the document request to when the server started responding is not acceptable.\n * @example {601 ms} PH1\n */\n failedServerResponseTime: 'Server responded slowly (observed {PH1})',\n /**\n * @description Text to tell the user that text compression (like gzip) was applied.\n */\n passingTextCompression: 'Applies text compression',\n /**\n * @description Text to tell the user that text compression (like gzip) was not applied.\n */\n failedTextCompression: 'No compression applied',\n /**\n * @description Text for a label describing a network request event as having redirects.\n */\n redirectsLabel: 'Redirects',\n /**\n * @description Text for a label describing a network request event as taking too long to start delivery by the server.\n */\n serverResponseTimeLabel: 'Server response time',\n /**\n * @description Text for a label describing a network request event as taking longer to download because it wasn't compressed.\n */\n uncompressedDownload: 'Uncompressed download',\n} as const;\n\nconst str_ = i18n.i18n.registerUIStrings('models/trace/insights/DocumentLatency.ts', UIStrings);\nexport const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);\n\n// Due to the way that DevTools throttling works we cannot see if server response took less than ~570ms.\n// We set our failure threshold to 600ms to avoid those false positives but we want devs to shoot for 100ms.\nconst TOO_SLOW_THRESHOLD_MS = 600;\nconst TARGET_MS = 100;\n\n// Threshold for compression savings.\nconst IGNORE_THRESHOLD_IN_BYTES = 1400;\n\nexport function isDocumentLatency(x: InsightModel): x is DocumentLatencyInsightModel {\n return x.insightKey === 'DocumentLatency';\n}\n\nexport type DocumentLatencyInsightModel = InsightModel<typeof UIStrings, {\n data?: {\n serverResponseTime: Types.Timing.Milli,\n redirectDuration: Types.Timing.Milli,\n uncompressedResponseBytes: number,\n checklist: Checklist<'noRedirects'|'serverResponseIsFast'|'usesCompression'>,\n documentRequest?: Types.Events.SyntheticNetworkRequest,\n },\n}>;\n\nfunction getServerResponseTime(\n request: Types.Events.SyntheticNetworkRequest, context: InsightSetContext): Types.Timing.Milli|null {\n // Prefer the value as given by the Lantern provider.\n // For PSI, Lighthouse uses this to set a better value for the server response\n // time. For technical reasons, in Lightrider we do not have `sendEnd` timing\n // values. See Lighthouse's `asLanternNetworkRequest` function for more.\n const lanternRequest = context.navigation && context.lantern?.requests.find(r => r.rawRequest === request);\n if (lanternRequest?.serverResponseTime !== undefined) {\n return lanternRequest.serverResponseTime as Types.Timing.Milli;\n }\n\n const timing = request.args.data.timing;\n if (!timing) {\n return null;\n }\n\n const ms = Helpers.Timing.microToMilli(request.args.data.syntheticData.waiting);\n return Math.round(ms) as Types.Timing.Milli;\n}\n\nfunction getCompressionSavings(request: Types.Events.SyntheticNetworkRequest): number {\n const isCompressed = isRequestCompressed(request);\n if (isCompressed) {\n return 0;\n }\n\n // We don't know how many bytes this asset used on the network, but we can guess it was\n // roughly the size of the content gzipped.\n // See https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/optimize-encoding-and-transfer for specific CSS/Script examples\n // See https://discuss.httparchive.org/t/file-size-and-compression-savings/145 for fallback multipliers\n // See https://letstalkaboutwebperf.com/en/gzip-brotli-server-config/ for MIME types to compress\n const originalSize = request.args.data.decodedBodyLength;\n let estimatedSavings = 0;\n switch (request.args.data.mimeType) {\n case 'text/css':\n // Stylesheets tend to compress extremely well.\n estimatedSavings = Math.round(originalSize * 0.8);\n break;\n case 'text/html':\n case 'text/javascript':\n // Scripts and HTML compress fairly well too.\n estimatedSavings = Math.round(originalSize * 0.67);\n break;\n case 'text/plain':\n case 'text/xml':\n case 'text/x-component':\n case 'application/javascript':\n case 'application/json':\n case 'application/manifest+json':\n case 'application/vnd.api+json':\n case 'application/xml':\n case 'application/xhtml+xml':\n case 'application/rss+xml':\n case 'application/atom+xml':\n case 'application/vnd.ms-fontobject':\n case 'application/x-font-ttf':\n case 'application/x-font-opentype':\n case 'application/x-font-truetype':\n case 'image/svg+xml':\n case 'image/x-icon':\n case 'image/vnd.microsoft.icon':\n case 'font/ttf':\n case 'font/eot':\n case 'font/otf':\n case 'font/opentype':\n // Use the average savings in HTTPArchive.\n estimatedSavings = Math.round(originalSize * 0.5);\n break;\n default: // Any other MIME types are likely already compressed.\n }\n // Check if the estimated savings are greater than the byte ignore threshold.\n // Note that the estimated gzip savings are always more than 10%, so there is\n // no percent threshold.\n return estimatedSavings < IGNORE_THRESHOLD_IN_BYTES ? 0 : estimatedSavings;\n}\n\nfunction finalize(partialModel: PartialInsightModel<DocumentLatencyInsightModel>): DocumentLatencyInsightModel {\n let hasFailure = false;\n if (partialModel.data) {\n hasFailure = !partialModel.data.checklist.usesCompression.value ||\n !partialModel.data.checklist.serverResponseIsFast.value || !partialModel.data.checklist.noRedirects.value;\n }\n\n return {\n insightKey: InsightKeys.DOCUMENT_LATENCY,\n strings: UIStrings,\n title: i18nString(UIStrings.title),\n description: i18nString(UIStrings.description),\n category: InsightCategory.ALL,\n state: hasFailure ? 'fail' : 'pass',\n ...partialModel,\n };\n}\n\nexport function generateInsight(\n parsedTrace: Handlers.Types.ParsedTrace, context: InsightSetContext): DocumentLatencyInsightModel {\n if (!context.navigation) {\n return finalize({});\n }\n\n const documentRequest = parsedTrace.NetworkRequests.byId.get(context.navigationId);\n if (!documentRequest) {\n return finalize({warnings: [InsightWarning.NO_DOCUMENT_REQUEST]});\n }\n\n const serverResponseTime = getServerResponseTime(documentRequest, context);\n if (serverResponseTime === null) {\n throw new Error('missing document request timing');\n }\n\n const serverResponseTooSlow = serverResponseTime > TOO_SLOW_THRESHOLD_MS;\n\n let overallSavingsMs = 0;\n if (serverResponseTime > TOO_SLOW_THRESHOLD_MS) {\n overallSavingsMs = Math.max(serverResponseTime - TARGET_MS, 0);\n }\n\n const redirectDuration = Math.round(documentRequest.args.data.syntheticData.redirectionDuration / 1000);\n overallSavingsMs += redirectDuration;\n\n const metricSavings = {\n FCP: overallSavingsMs as Types.Timing.Milli,\n LCP: overallSavingsMs as Types.Timing.Milli,\n };\n\n const uncompressedResponseBytes = getCompressionSavings(documentRequest);\n\n const noRedirects = redirectDuration === 0;\n const serverResponseIsFast = !serverResponseTooSlow;\n const usesCompression = uncompressedResponseBytes === 0;\n\n return finalize({\n relatedEvents: [documentRequest],\n data: {\n serverResponseTime,\n redirectDuration: Types.Timing.Milli(redirectDuration),\n uncompressedResponseBytes,\n documentRequest,\n checklist: {\n noRedirects: {\n label: noRedirects ? i18nString(UIStrings.passingRedirects) : i18nString(UIStrings.failedRedirects, {\n PH1: documentRequest.args.data.redirects.length,\n PH2: i18n.TimeUtilities.millisToString(redirectDuration),\n }),\n value: noRedirects\n },\n serverResponseIsFast: {\n label: serverResponseIsFast ?\n i18nString(\n UIStrings.passingServerResponseTime, {PH1: i18n.TimeUtilities.millisToString(serverResponseTime)}) :\n i18nString(\n UIStrings.failedServerResponseTime, {PH1: i18n.TimeUtilities.millisToString(serverResponseTime)}),\n value: serverResponseIsFast\n },\n usesCompression: {\n label: usesCompression ? i18nString(UIStrings.passingTextCompression) :\n i18nString(UIStrings.failedTextCompression),\n value: usesCompression\n },\n },\n },\n metricSavings,\n wastedBytes: uncompressedResponseBytes,\n });\n}\n\nexport function createOverlays(model: DocumentLatencyInsightModel): Types.Overlays.Overlay[] {\n if (!model.data?.documentRequest) {\n return [];\n }\n\n const overlays: Types.Overlays.Overlay[] = [];\n const event = model.data.documentRequest;\n const redirectDurationMicro = Helpers.Timing.milliToMicro(model.data.redirectDuration);\n\n const sections = [];\n if (model.data.redirectDuration) {\n const bounds = Helpers.Timing.traceWindowFromMicroSeconds(\n event.ts,\n (event.ts + redirectDurationMicro) as Types.Timing.Micro,\n );\n sections.push({bounds, label: i18nString(UIStrings.redirectsLabel), showDuration: true});\n overlays.push({type: 'CANDY_STRIPED_TIME_RANGE', bounds, entry: event});\n }\n if (!model.data.checklist.serverResponseIsFast.value) {\n const serverResponseTimeMicro = Helpers.Timing.milliToMicro(model.data.serverResponseTime);\n // NOTE: NetworkRequestHandlers never makes a synthetic network request event if `timing` is missing.\n const sendEnd = event.args.data.timing?.sendEnd ?? Types.Timing.Milli(0);\n const sendEndMicro = Helpers.Timing.milliToMicro(sendEnd);\n const bounds = Helpers.Timing.traceWindowFromMicroSeconds(\n sendEndMicro,\n (sendEndMicro + serverResponseTimeMicro) as Types.Timing.Micro,\n );\n sections.push({bounds, label: i18nString(UIStrings.serverResponseTimeLabel), showDuration: true});\n }\n if (model.data.uncompressedResponseBytes) {\n const bounds = Helpers.Timing.traceWindowFromMicroSeconds(\n event.args.data.syntheticData.downloadStart,\n (event.args.data.syntheticData.downloadStart + event.args.data.syntheticData.download) as Types.Timing.Micro,\n );\n sections.push({bounds, label: i18nString(UIStrings.uncompressedDownload), showDuration: true});\n overlays.push({type: 'CANDY_STRIPED_TIME_RANGE', bounds, entry: event});\n }\n\n if (sections.length) {\n overlays.push({\n type: 'TIMESPAN_BREAKDOWN',\n sections,\n entry: model.data.documentRequest,\n // Always render below because the document request is guaranteed to be\n // the first request in the network track.\n renderLocation: 'BELOW_EVENT',\n });\n }\n overlays.push({\n type: 'ENTRY_SELECTED',\n entry: model.data.documentRequest,\n });\n\n return overlays;\n}\n"]} |