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 * as Protocol from '../../../generated/protocol.js';\nimport * as Handlers from '../handlers/handlers.js';\nimport * as Helpers from '../helpers/helpers.js';\nimport type * as Lantern from '../lantern/lantern.js';\nimport type * as Types from '../types/types.js';\n\nimport {\n InsightCategory,\n InsightKeys,\n type InsightModel,\n type InsightSetContext,\n type InsightSetContextWithNavigation,\n InsightWarning,\n type LanternContext,\n type PartialInsightModel,\n} from './types.js';\n\nexport const UIStrings = {\n /**\n * @description Title of an insight that provides the user with the list of network requests that blocked and therefore slowed down the page rendering and becoming visible to the user.\n */\n title: 'Render blocking requests',\n /**\n * @description Text to describe that there are requests blocking rendering, which may affect LCP.\n */\n description: 'Requests are blocking the page\\'s initial render, which may delay LCP. ' +\n '[Deferring or inlining](https://web.dev/learn/performance/understanding-the-critical-path#render-blocking_resources) ' +\n 'can move these network requests out of the critical path.',\n /**\n * @description Label to describe a network request (that happens to be render-blocking).\n */\n renderBlockingRequest: 'Request',\n /**\n * @description Label used for a time duration.\n */\n duration: 'Duration',\n /**\n * @description Text status indicating that no requests blocked the initial render of a navigation\n */\n noRenderBlocking: 'No render blocking requests for this navigation',\n} as const;\n\nconst str_ = i18n.i18n.registerUIStrings('models/trace/insights/RenderBlocking.ts', UIStrings);\nexport const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);\n\nexport function isRenderBlocking(insight: InsightModel): insight is RenderBlockingInsightModel {\n return insight.insightKey === 'RenderBlocking';\n}\n\nexport type RenderBlockingInsightModel = InsightModel<typeof UIStrings, {\n renderBlockingRequests: Types.Events.SyntheticNetworkRequest[],\n requestIdToWastedMs?: Map<string, number>,\n}>;\n\n// Because of the way we detect blocking stylesheets, asynchronously loaded\n// CSS with link[rel=preload] and an onload handler (see https://github.com/filamentgroup/loadCSS)\n// can be falsely flagged as blocking. Therefore, ignore stylesheets that loaded fast enough\n// to possibly be non-blocking (and they have minimal impact anyway).\nconst MINIMUM_WASTED_MS = 50;\n\n/**\n * Given a simulation's nodeTimings, return an object with the nodes/timing keyed by network URL\n */\nfunction getNodesAndTimingByRequestId(nodeTimings: Lantern.Simulation.Result['nodeTimings']):\n Map<string, {node: Lantern.Graph.Node, nodeTiming: Lantern.Types.Simulation.NodeTiming}> {\n const requestIdToNode =\n new Map<string, {node: Lantern.Graph.Node, nodeTiming: Lantern.Types.Simulation.NodeTiming}>();\n\n for (const [node, nodeTiming] of nodeTimings) {\n if (node.type !== 'network') {\n continue;\n }\n\n requestIdToNode.set(node.request.requestId, {node, nodeTiming});\n }\n\n return requestIdToNode;\n}\n\nfunction estimateSavingsWithGraphs(deferredIds: Set<string>, lanternContext: LanternContext): Types.Timing.Milli {\n const simulator = lanternContext.simulator;\n const fcpGraph = lanternContext.metrics.firstContentfulPaint.optimisticGraph;\n const {nodeTimings} = lanternContext.simulator.simulate(fcpGraph);\n const adjustedNodeTimings = new Map(nodeTimings);\n\n const totalChildNetworkBytes = 0;\n const minimalFCPGraph = fcpGraph.cloneWithRelationships(node => {\n // If a node can be deferred, exclude it from the new FCP graph\n const canDeferRequest = deferredIds.has(node.id);\n return !canDeferRequest;\n });\n\n if (minimalFCPGraph.type !== 'network') {\n throw new Error('minimalFCPGraph not a NetworkNode');\n }\n\n // Recalculate the \"before\" time based on our adjusted node timings.\n const estimateBeforeInline = Math.max(...Array.from(\n Array.from(adjustedNodeTimings).map(timing => timing[1].endTime),\n ));\n\n // Add the inlined bytes to the HTML response\n const originalTransferSize = minimalFCPGraph.request.transferSize;\n const safeTransferSize = originalTransferSize || 0;\n minimalFCPGraph.request.transferSize = safeTransferSize + totalChildNetworkBytes;\n const estimateAfterInline = simulator.simulate(minimalFCPGraph).timeInMs;\n minimalFCPGraph.request.transferSize = originalTransferSize;\n return Math.round(Math.max(estimateBeforeInline - estimateAfterInline, 0)) as Types.Timing.Milli;\n}\n\nfunction hasImageLCP(parsedTrace: Handlers.Types.ParsedTrace, context: InsightSetContextWithNavigation): boolean {\n return parsedTrace.LargestImagePaint.lcpRequestByNavigationId.has(context.navigationId);\n}\n\nfunction computeSavings(\n parsedTrace: Handlers.Types.ParsedTrace, context: InsightSetContextWithNavigation,\n renderBlockingRequests: Types.Events.SyntheticNetworkRequest[]):\n Pick<RenderBlockingInsightModel, 'metricSavings'|'requestIdToWastedMs'>|undefined {\n if (!context.lantern) {\n return;\n }\n\n const nodesAndTimingsByRequestId =\n getNodesAndTimingByRequestId(context.lantern.metrics.firstContentfulPaint.optimisticEstimate.nodeTimings);\n\n const metricSavings = {FCP: 0 as Types.Timing.Milli, LCP: 0 as Types.Timing.Milli};\n const requestIdToWastedMs = new Map<string, number>();\n const deferredNodeIds = new Set<string>();\n for (const request of renderBlockingRequests) {\n const nodeAndTiming = nodesAndTimingsByRequestId.get(request.args.data.requestId);\n if (!nodeAndTiming) {\n continue;\n }\n\n const {node, nodeTiming} = nodeAndTiming;\n\n // Mark this node and all its dependents as deferrable\n node.traverse(node => deferredNodeIds.add(node.id));\n\n // \"wastedMs\" is the download time of the network request, responseReceived - requestSent\n const wastedMs = Math.round(nodeTiming.duration);\n if (wastedMs < MINIMUM_WASTED_MS) {\n continue;\n }\n\n requestIdToWastedMs.set(node.id, wastedMs);\n }\n\n if (requestIdToWastedMs.size) {\n metricSavings.FCP = estimateSavingsWithGraphs(deferredNodeIds, context.lantern);\n\n // In most cases, render blocking resources only affect LCP if LCP isn't an image.\n if (!hasImageLCP(parsedTrace, context)) {\n metricSavings.LCP = metricSavings.FCP;\n }\n }\n\n return {metricSavings, requestIdToWastedMs};\n}\n\nfunction finalize(partialModel: PartialInsightModel<RenderBlockingInsightModel>): RenderBlockingInsightModel {\n return {\n insightKey: InsightKeys.RENDER_BLOCKING,\n strings: UIStrings,\n title: i18nString(UIStrings.title),\n description: i18nString(UIStrings.description),\n category: InsightCategory.LCP,\n state: partialModel.renderBlockingRequests.length > 0 ? 'fail' : 'pass',\n ...partialModel,\n };\n}\n\nexport function generateInsight(\n parsedTrace: Handlers.Types.ParsedTrace, context: InsightSetContext): RenderBlockingInsightModel {\n if (!context.navigation) {\n return finalize({\n renderBlockingRequests: [],\n });\n }\n\n const firstPaintTs = parsedTrace.PageLoadMetrics.metricScoresByFrameId.get(context.frameId)\n ?.get(context.navigationId)\n ?.get(Handlers.ModelHandlers.PageLoadMetrics.MetricName.FP)\n ?.event?.ts;\n if (!firstPaintTs) {\n return finalize({\n renderBlockingRequests: [],\n warnings: [InsightWarning.NO_FP],\n });\n }\n\n let renderBlockingRequests: Types.Events.SyntheticNetworkRequest[] = [];\n for (const req of parsedTrace.NetworkRequests.byTime) {\n if (req.args.data.frame !== context.frameId) {\n continue;\n }\n\n if (!Helpers.Network.isSyntheticNetworkRequestEventRenderBlocking(req)) {\n continue;\n }\n\n if (req.args.data.syntheticData.finishTime > firstPaintTs) {\n continue;\n }\n\n // If a request is marked `in_body_parser_blocking` it should only be considered render blocking if it is a\n // high enough priority. Some requests (e.g. scripts) are not marked as high priority if they are fetched\n // after a non-preloaded image. (See \"early\" definition in https://web.dev/articles/fetch-priority)\n //\n // There are edge cases and exceptions (e.g. priority hints) but this gives us the best approximation\n // of render blocking resources in the document body.\n if (req.args.data.renderBlocking === 'in_body_parser_blocking') {\n const priority = req.args.data.priority;\n const isScript = req.args.data.resourceType === Protocol.Network.ResourceType.Script;\n const isBlockingScript = isScript && priority === Protocol.Network.ResourcePriority.High;\n if (priority !== Protocol.Network.ResourcePriority.VeryHigh && !isBlockingScript) {\n continue;\n }\n }\n\n const navigation =\n Helpers.Trace.getNavigationForTraceEvent(req, context.frameId, parsedTrace.Meta.navigationsByFrameId);\n if (navigation === context.navigation) {\n renderBlockingRequests.push(req);\n }\n }\n\n const savings = computeSavings(parsedTrace, context, renderBlockingRequests);\n\n // Sort by request duration for insights.\n renderBlockingRequests = renderBlockingRequests.sort((a, b) => {\n return b.dur - a.dur;\n });\n\n return finalize({\n relatedEvents: renderBlockingRequests,\n renderBlockingRequests,\n ...savings,\n });\n}\n\nexport function createOverlayForRequest(request: Types.Events.SyntheticNetworkRequest): Types.Overlays.EntryOutline {\n return {\n type: 'ENTRY_OUTLINE',\n entry: request,\n outlineReason: 'ERROR',\n };\n}\n\nexport function createOverlays(model: RenderBlockingInsightModel): Types.Overlays.Overlay[] {\n return model.renderBlockingRequests.map(request => createOverlayForRequest(request));\n}\n"]} |