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>
1 line
No EOL
41 KiB
Text
1 line
No EOL
41 KiB
Text
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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 Platform from '../../../core/platform/platform.js';\nimport type * as Protocol from '../../../generated/protocol.js';\nimport * as Handlers from '../handlers/handlers.js';\nimport * as Helpers from '../helpers/helpers.js';\nimport * as Types from '../types/types.js';\n\nimport {\n InsightCategory,\n InsightKeys,\n type InsightModel,\n type InsightSetContext,\n type PartialInsightModel,\n} from './types.js';\n\nexport const UIStrings = {\n /** Title of an insight that provides details about why elements shift/move on the page. The causes for these shifts are referred to as culprits (\"reasons\"). */\n title: 'Layout shift culprits',\n /**\n * @description Description of a DevTools insight that identifies the reasons that elements shift on the page.\n * This is displayed after a user expands the section to see more. No character length limits.\n */\n description:\n 'Layout shifts occur when elements move absent any user interaction. [Investigate the causes of layout shifts](https://web.dev/articles/optimize-cls), such as elements being added, removed, or their fonts changing as the page loads.',\n /**\n * @description Text indicating the worst layout shift cluster.\n */\n worstLayoutShiftCluster: 'Worst layout shift cluster',\n /**\n * @description Text indicating the worst layout shift cluster.\n */\n worstCluster: 'Worst cluster',\n /**\n * @description Text indicating a layout shift cluster and its start time.\n * @example {32 ms} PH1\n */\n layoutShiftCluster: 'Layout shift cluster @ {PH1}',\n /**\n * @description Text indicating the biggest reasons for the layout shifts.\n */\n topCulprits: 'Top layout shift culprits',\n /**\n * @description Text for a culprit type of Injected iframe.\n */\n injectedIframe: 'Injected iframe',\n /**\n * @description Text for a culprit type of web font request.\n */\n webFont: 'Web font',\n /**\n * @description Text for a culprit type of Animation.\n */\n animation: 'Animation',\n /**\n * @description Text for a culprit type of Unsized image.\n */\n unsizedImage: 'Unsized image element',\n /**\n * @description Text status when there were no layout shifts detected.\n */\n noLayoutShifts: 'No layout shifts',\n /**\n * @description Text status when there no layout shifts culprits/root causes were found.\n */\n noCulprits: 'Could not detect any layout shift culprits',\n} as const;\n\nconst str_ = i18n.i18n.registerUIStrings('models/trace/insights/CLSCulprits.ts', UIStrings);\nexport const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);\n\nexport type CLSCulpritsInsightModel = InsightModel<typeof UIStrings, {\n animationFailures: readonly NoncompositedAnimationFailure[],\n shifts: Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData>,\n clusters: Types.Events.SyntheticLayoutShiftCluster[],\n worstCluster: Types.Events.SyntheticLayoutShiftCluster | undefined,\n /** The top 3 shift root causes for each cluster. */\n topCulpritsByCluster: Map<Types.Events.SyntheticLayoutShiftCluster, LayoutShiftItem[]>,\n}>;\n\nexport enum AnimationFailureReasons {\n ACCELERATED_ANIMATIONS_DISABLED = 'ACCELERATED_ANIMATIONS_DISABLED',\n EFFECT_SUPPRESSED_BY_DEVTOOLS = 'EFFECT_SUPPRESSED_BY_DEVTOOLS',\n INVALID_ANIMATION_OR_EFFECT = 'INVALID_ANIMATION_OR_EFFECT',\n EFFECT_HAS_UNSUPPORTED_TIMING_PARAMS = 'EFFECT_HAS_UNSUPPORTED_TIMING_PARAMS',\n EFFECT_HAS_NON_REPLACE_COMPOSITE_MODE = 'EFFECT_HAS_NON_REPLACE_COMPOSITE_MODE',\n TARGET_HAS_INVALID_COMPOSITING_STATE = 'TARGET_HAS_INVALID_COMPOSITING_STATE',\n TARGET_HAS_INCOMPATIBLE_ANIMATIONS = 'TARGET_HAS_INCOMPATIBLE_ANIMATIONS',\n TARGET_HAS_CSS_OFFSET = 'TARGET_HAS_CSS_OFFSET',\n ANIMATION_AFFECTS_NON_CSS_PROPERTIES = 'ANIMATION_AFFECTS_NON_CSS_PROPERTIES',\n TRANSFORM_RELATED_PROPERTY_CANNOT_BE_ACCELERATED_ON_TARGET =\n 'TRANSFORM_RELATED_PROPERTY_CANNOT_BE_ACCELERATED_ON_TARGET',\n TRANSFROM_BOX_SIZE_DEPENDENT = 'TRANSFROM_BOX_SIZE_DEPENDENT',\n FILTER_RELATED_PROPERTY_MAY_MOVE_PIXELS = 'FILTER_RELATED_PROPERTY_MAY_MOVE_PIXELS',\n UNSUPPORTED_CSS_PROPERTY = 'UNSUPPORTED_CSS_PROPERTY',\n MIXED_KEYFRAME_VALUE_TYPES = 'MIXED_KEYFRAME_VALUE_TYPES',\n TIMELINE_SOURCE_HAS_INVALID_COMPOSITING_STATE = 'TIMELINE_SOURCE_HAS_INVALID_COMPOSITING_STATE',\n ANIMATION_HAS_NO_VISIBLE_CHANGE = 'ANIMATION_HAS_NO_VISIBLE_CHANGE',\n AFFECTS_IMPORTANT_PROPERTY = 'AFFECTS_IMPORTANT_PROPERTY',\n SVG_TARGET_HAS_INDEPENDENT_TRANSFORM_PROPERTY = 'SVG_TARGET_HAS_INDEPENDENT_TRANSFORM_PROPERTY',\n}\n\nexport enum LayoutShiftType {\n WEB_FONT = 0,\n IFRAMES = 1,\n ANIMATIONS = 2,\n UNSIZED_IMAGE = 3,\n}\n\nexport type LayoutShiftItem = {\n type: LayoutShiftType.UNSIZED_IMAGE,\n description: Platform.UIString.LocalizedString,\n url: string,\n backendNodeId: Protocol.DOM.BackendNodeId,\n frame: string,\n}|{\n type: Exclude<LayoutShiftType, LayoutShiftType.UNSIZED_IMAGE>,\n description: Platform.UIString.LocalizedString,\n};\n\nexport interface NoncompositedAnimationFailure {\n /**\n * Animation name.\n */\n name?: string;\n /**\n * Failure reason based on mask number defined in\n * https://source.chromium.org/search?q=f:compositor_animations.h%20%22enum%20FailureReason%22.\n */\n failureReasons: AnimationFailureReasons[];\n /**\n * Unsupported properties.\n */\n unsupportedProperties?: Types.Events.Animation['args']['data']['unsupportedProperties'];\n /**\n * Animation event.\n */\n animation?: Types.Events.SyntheticAnimationPair;\n}\n\n/**\n * Each failure reason is represented by a bit flag. The bit shift operator '<<' is used to define\n * which bit corresponds to each failure reason.\n * https://source.chromium.org/search?q=f:compositor_animations.h%20%22enum%20FailureReason%22\n */\nconst ACTIONABLE_FAILURE_REASONS: Array<{\n flag: number,\n failure: AnimationFailureReasons,\n}> =\n [\n {\n flag: 1 << 0,\n failure: AnimationFailureReasons.ACCELERATED_ANIMATIONS_DISABLED,\n },\n {\n flag: 1 << 1,\n failure: AnimationFailureReasons.EFFECT_SUPPRESSED_BY_DEVTOOLS,\n },\n {\n flag: 1 << 2,\n failure: AnimationFailureReasons.INVALID_ANIMATION_OR_EFFECT,\n },\n {\n flag: 1 << 3,\n failure: AnimationFailureReasons.EFFECT_HAS_UNSUPPORTED_TIMING_PARAMS,\n },\n {\n flag: 1 << 4,\n failure: AnimationFailureReasons.EFFECT_HAS_NON_REPLACE_COMPOSITE_MODE,\n },\n {\n flag: 1 << 5,\n failure: AnimationFailureReasons.TARGET_HAS_INVALID_COMPOSITING_STATE,\n },\n {\n flag: 1 << 6,\n failure: AnimationFailureReasons.TARGET_HAS_INCOMPATIBLE_ANIMATIONS,\n },\n {\n flag: 1 << 7,\n failure: AnimationFailureReasons.TARGET_HAS_CSS_OFFSET,\n },\n // The failure 1 << 8 is marked as obsolete in Blink\n {\n flag: 1 << 9,\n failure: AnimationFailureReasons.ANIMATION_AFFECTS_NON_CSS_PROPERTIES,\n },\n {\n flag: 1 << 10,\n failure: AnimationFailureReasons.TRANSFORM_RELATED_PROPERTY_CANNOT_BE_ACCELERATED_ON_TARGET,\n },\n {\n flag: 1 << 11,\n failure: AnimationFailureReasons.TRANSFROM_BOX_SIZE_DEPENDENT,\n },\n {\n flag: 1 << 12,\n failure: AnimationFailureReasons.FILTER_RELATED_PROPERTY_MAY_MOVE_PIXELS,\n },\n {\n flag: 1 << 13,\n failure: AnimationFailureReasons.UNSUPPORTED_CSS_PROPERTY,\n },\n // The failure 1 << 14 is marked as obsolete in Blink\n {\n flag: 1 << 15,\n failure: AnimationFailureReasons.MIXED_KEYFRAME_VALUE_TYPES,\n },\n {\n flag: 1 << 16,\n failure: AnimationFailureReasons.TIMELINE_SOURCE_HAS_INVALID_COMPOSITING_STATE,\n },\n {\n flag: 1 << 17,\n failure: AnimationFailureReasons.ANIMATION_HAS_NO_VISIBLE_CHANGE,\n },\n {\n flag: 1 << 18,\n failure: AnimationFailureReasons.AFFECTS_IMPORTANT_PROPERTY,\n },\n {\n flag: 1 << 19,\n failure: AnimationFailureReasons.SVG_TARGET_HAS_INDEPENDENT_TRANSFORM_PROPERTY,\n },\n ] as const;\n\n// 500ms window.\n// Use this window to consider events and requests that may have caused a layout shift.\nconst ROOT_CAUSE_WINDOW = Helpers.Timing.secondsToMicro(Types.Timing.Seconds(0.5));\n\nexport interface UnsizedImage {\n backendNodeId: Protocol.DOM.BackendNodeId;\n paintImageEvent: Types.Events.PaintImage;\n}\n\nexport interface IframeRootCause {\n frame: string;\n url?: string;\n}\n\nexport interface LayoutShiftRootCausesData {\n iframes: IframeRootCause[];\n webFonts: Types.Events.SyntheticNetworkRequest[];\n nonCompositedAnimations: NoncompositedAnimationFailure[];\n unsizedImages: UnsizedImage[];\n}\n\n/**\n * Returns if an event happens within the root cause window, before the target event.\n * ROOT_CAUSE_WINDOW v target event\n * |------------------------|=======================\n */\nfunction isInRootCauseWindow(event: Types.Events.Event, targetEvent: Types.Events.Event): boolean {\n const eventEnd = event.dur ? event.ts + event.dur : event.ts;\n return eventEnd < targetEvent.ts && eventEnd >= targetEvent.ts - ROOT_CAUSE_WINDOW;\n}\n\nexport function getNonCompositedFailure(animationEvent: Types.Events.SyntheticAnimationPair):\n NoncompositedAnimationFailure[] {\n const failures: NoncompositedAnimationFailure[] = [];\n const beginEvent = animationEvent.args.data.beginEvent;\n const instantEvents = animationEvent.args.data.instantEvents || [];\n /**\n * Animation events containing composite information are ASYNC_NESTABLE_INSTANT ('n').\n * An animation may also contain multiple 'n' events, so we look through those with useful non-composited data.\n */\n for (const event of instantEvents) {\n const failureMask = event.args.data.compositeFailed;\n const unsupportedProperties = event.args.data.unsupportedProperties;\n if (!failureMask) {\n continue;\n }\n const failureReasons =\n ACTIONABLE_FAILURE_REASONS.filter(reason => failureMask & reason.flag).map(reason => reason.failure);\n const failure: NoncompositedAnimationFailure = {\n name: beginEvent.args.data.displayName,\n failureReasons,\n unsupportedProperties,\n animation: animationEvent,\n };\n failures.push(failure);\n }\n return failures;\n}\n\nfunction getNonCompositedFailureRootCauses(\n animationEvents: Types.Events.SyntheticAnimationPair[],\n prePaintEvents: Types.Events.PrePaint[],\n shiftsByPrePaint: Map<Types.Events.PrePaint, Types.Events.SyntheticLayoutShift[]>,\n rootCausesByShift: Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData>,\n ): NoncompositedAnimationFailure[] {\n const allAnimationFailures: NoncompositedAnimationFailure[] = [];\n for (const animation of animationEvents) {\n /**\n * Animation events containing composite information are ASYNC_NESTABLE_INSTANT ('n').\n * An animation may also contain multiple 'n' events, so we look through those with useful non-composited data.\n */\n const failures = getNonCompositedFailure(animation);\n if (!failures) {\n continue;\n }\n allAnimationFailures.push(...failures);\n\n const nextPrePaint = getNextEvent(prePaintEvents, animation) as Types.Events.PrePaint | null;\n // If no following prePaint, this is not a root cause.\n if (!nextPrePaint) {\n continue;\n }\n\n // If the animation event is outside the ROOT_CAUSE_WINDOW, it could not be a root cause.\n if (!isInRootCauseWindow(animation, nextPrePaint)) {\n continue;\n }\n\n const shifts = shiftsByPrePaint.get(nextPrePaint);\n // if no layout shift(s), this is not a root cause.\n if (!shifts) {\n continue;\n }\n\n for (const shift of shifts) {\n const rootCausesForShift = rootCausesByShift.get(shift);\n if (!rootCausesForShift) {\n throw new Error('Unaccounted shift');\n }\n rootCausesForShift.nonCompositedAnimations.push(...failures);\n }\n }\n\n return allAnimationFailures;\n}\n\n/**\n * Given an array of layout shift and PrePaint events, returns a mapping from\n * PrePaint events to layout shifts dispatched within it.\n */\nfunction getShiftsByPrePaintEvents(\n layoutShifts: Types.Events.SyntheticLayoutShift[],\n prePaintEvents: Types.Events.PrePaint[],\n ): Map<Types.Events.PrePaint, Types.Events.SyntheticLayoutShift[]> {\n // Maps from PrePaint events to LayoutShifts that occurred in each one.\n const shiftsByPrePaint = new Map<Types.Events.PrePaint, Types.Events.SyntheticLayoutShift[]>();\n\n // Associate all shifts to their corresponding PrePaint.\n for (const prePaintEvent of prePaintEvents) {\n const firstShiftIndex =\n Platform.ArrayUtilities.nearestIndexFromBeginning(layoutShifts, shift => shift.ts >= prePaintEvent.ts);\n if (firstShiftIndex === null) {\n // No layout shifts registered after this PrePaint start. Continue.\n continue;\n }\n for (let i = firstShiftIndex; i < layoutShifts.length; i++) {\n const shift = layoutShifts[i];\n if (shift.ts >= prePaintEvent.ts && shift.ts <= prePaintEvent.ts + prePaintEvent.dur) {\n const shiftsInPrePaint = Platform.MapUtilities.getWithDefault(shiftsByPrePaint, prePaintEvent, () => []);\n shiftsInPrePaint.push(shift);\n }\n if (shift.ts > prePaintEvent.ts + prePaintEvent.dur) {\n // Reached all layoutShifts of this PrePaint. Break out to continue with the next prePaint event.\n break;\n }\n }\n }\n return shiftsByPrePaint;\n}\n\n/**\n * Given a source event list, this returns the first event of that list that directly follows the target event.\n */\nfunction getNextEvent(sourceEvents: Types.Events.Event[], targetEvent: Types.Events.Event): Types.Events.Event|\n undefined {\n const index = Platform.ArrayUtilities.nearestIndexFromBeginning(\n sourceEvents, source => source.ts > targetEvent.ts + (targetEvent.dur || 0));\n // No PrePaint event registered after this event\n if (index === null) {\n return undefined;\n }\n\n return sourceEvents[index];\n}\n\n/**\n * An Iframe is considered a root cause if the iframe event occurs before a prePaint event\n * and within this prePaint event a layout shift(s) occurs.\n */\nfunction getIframeRootCauses(\n parsedTrace: Handlers.Types.ParsedTrace,\n iframeCreatedEvents: readonly Types.Events.RenderFrameImplCreateChildFrame[],\n prePaintEvents: Types.Events.PrePaint[],\n shiftsByPrePaint: Map<Types.Events.PrePaint, Types.Events.SyntheticLayoutShift[]>,\n rootCausesByShift: Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData>,\n domLoadingEvents: readonly Types.Events.DomLoading[]):\n Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData> {\n for (const iframeEvent of iframeCreatedEvents) {\n const nextPrePaint = getNextEvent(prePaintEvents, iframeEvent) as Types.Events.PrePaint | null;\n // If no following prePaint, this is not a root cause.\n if (!nextPrePaint) {\n continue;\n }\n const shifts = shiftsByPrePaint.get(nextPrePaint);\n // if no layout shift(s), this is not a root cause.\n if (!shifts) {\n continue;\n }\n for (const shift of shifts) {\n const rootCausesForShift = rootCausesByShift.get(shift);\n if (!rootCausesForShift) {\n throw new Error('Unaccounted shift');\n }\n\n // Look for the first dom event that occurs within the bounds of the iframe event.\n // This contains the frame id.\n const domEvent = domLoadingEvents.find(e => {\n const maxIframe = Types.Timing.Micro(iframeEvent.ts + (iframeEvent.dur ?? 0));\n return e.ts >= iframeEvent.ts && e.ts <= maxIframe;\n });\n if (domEvent?.args.frame) {\n const frame = domEvent.args.frame;\n\n let url;\n const processes = parsedTrace.Meta.rendererProcessesByFrame.get(frame);\n if (processes && processes.size > 0) {\n url = [...processes.values()][0]?.[0].frame.url;\n }\n\n rootCausesForShift.iframes.push({frame, url});\n }\n }\n }\n return rootCausesByShift;\n}\n\n/**\n * An unsized image is considered a root cause if its PaintImage can be correlated to a\n * layout shift. We can correlate PaintImages with unsized images by their matching nodeIds.\n * X <- layout shift\n * |----------------|\n * ^ PrePaint event |-----|\n * ^ PaintImage\n */\nfunction getUnsizedImageRootCauses(\n unsizedImageEvents: readonly Types.Events.LayoutImageUnsized[], paintImageEvents: Types.Events.PaintImage[],\n shiftsByPrePaint: Map<Types.Events.PrePaint, Types.Events.SyntheticLayoutShift[]>,\n rootCausesByShift: Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData>):\n Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData> {\n shiftsByPrePaint.forEach((shifts, prePaint) => {\n const paintImage = getNextEvent(paintImageEvents, prePaint) as Types.Events.PaintImage | null;\n if (!paintImage) {\n return;\n }\n // The unsized image corresponds to this PaintImage.\n const matchingNode =\n unsizedImageEvents.find(unsizedImage => unsizedImage.args.data.nodeId === paintImage.args.data.nodeId);\n if (!matchingNode) {\n return;\n }\n // The unsized image is a potential root cause of all the shifts of this prePaint.\n for (const shift of shifts) {\n const rootCausesForShift = rootCausesByShift.get(shift);\n if (!rootCausesForShift) {\n throw new Error('Unaccounted shift');\n }\n rootCausesForShift.unsizedImages.push({\n backendNodeId: matchingNode.args.data.nodeId,\n paintImageEvent: paintImage,\n });\n }\n });\n return rootCausesByShift;\n}\n\nexport function isCLSCulprits(insight: InsightModel): insight is CLSCulpritsInsightModel {\n return insight.insightKey === InsightKeys.CLS_CULPRITS;\n}\n\n/**\n * A font request is considered a root cause if the request occurs before a prePaint event\n * and within this prePaint event a layout shift(s) occurs. Additionally, this font request should\n * happen within the ROOT_CAUSE_WINDOW of the prePaint event.\n */\nfunction getFontRootCauses(\n networkRequests: Types.Events.SyntheticNetworkRequest[], prePaintEvents: Types.Events.PrePaint[],\n shiftsByPrePaint: Map<Types.Events.PrePaint, Types.Events.SyntheticLayoutShift[]>,\n rootCausesByShift: Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData>):\n Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData> {\n const fontRequests =\n networkRequests.filter(req => req.args.data.resourceType === 'Font' && req.args.data.mimeType.startsWith('font'));\n\n for (const req of fontRequests) {\n const nextPrePaint = getNextEvent(prePaintEvents, req) as Types.Events.PrePaint | null;\n if (!nextPrePaint) {\n continue;\n }\n\n // If the req is outside the ROOT_CAUSE_WINDOW, it could not be a root cause.\n if (!isInRootCauseWindow(req, nextPrePaint)) {\n continue;\n }\n\n // Get the shifts that belong to this prepaint\n const shifts = shiftsByPrePaint.get(nextPrePaint);\n\n // if no layout shift(s) in this prePaint, the request is not a root cause.\n if (!shifts) {\n continue;\n }\n // Include the root cause to the shifts in this prePaint.\n for (const shift of shifts) {\n const rootCausesForShift = rootCausesByShift.get(shift);\n if (!rootCausesForShift) {\n throw new Error('Unaccounted shift');\n }\n rootCausesForShift.webFonts.push(req);\n }\n }\n return rootCausesByShift;\n}\n\n/**\n * Returns the top 3 shift root causes based on the given cluster.\n */\nfunction getTopCulprits(\n cluster: Types.Events.SyntheticLayoutShiftCluster,\n culpritsByShift: Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData>): LayoutShiftItem[] {\n const MAX_TOP_CULPRITS = 3;\n const causes: LayoutShiftItem[] = [];\n\n const shifts = cluster.events;\n for (const shift of shifts) {\n const culprits = culpritsByShift.get(shift);\n if (!culprits) {\n continue;\n }\n\n const fontReq = culprits.webFonts;\n const iframes = culprits.iframes;\n const animations = culprits.nonCompositedAnimations;\n const unsizedImages = culprits.unsizedImages;\n\n for (let i = 0; i < fontReq.length && causes.length < MAX_TOP_CULPRITS; i++) {\n causes.push({type: LayoutShiftType.WEB_FONT, description: i18nString(UIStrings.webFont)});\n }\n for (let i = 0; i < iframes.length && causes.length < MAX_TOP_CULPRITS; i++) {\n causes.push({type: LayoutShiftType.IFRAMES, description: i18nString(UIStrings.injectedIframe)});\n }\n for (let i = 0; i < animations.length && causes.length < MAX_TOP_CULPRITS; i++) {\n causes.push({type: LayoutShiftType.ANIMATIONS, description: i18nString(UIStrings.animation)});\n }\n for (let i = 0; i < unsizedImages.length && causes.length < MAX_TOP_CULPRITS; i++) {\n causes.push({\n type: LayoutShiftType.UNSIZED_IMAGE,\n description: i18nString(UIStrings.unsizedImage),\n url: unsizedImages[i].paintImageEvent.args.data.url || '',\n backendNodeId: unsizedImages[i].backendNodeId,\n frame: unsizedImages[i].paintImageEvent.args.data.frame || '',\n });\n }\n\n if (causes.length >= MAX_TOP_CULPRITS) {\n break;\n }\n }\n\n return causes.slice(0, MAX_TOP_CULPRITS);\n}\n\nfunction finalize(partialModel: PartialInsightModel<CLSCulpritsInsightModel>): CLSCulpritsInsightModel {\n let state: CLSCulpritsInsightModel['state'] = 'pass';\n if (partialModel.worstCluster) {\n const classification = Handlers.ModelHandlers.LayoutShifts.scoreClassificationForLayoutShift(\n partialModel.worstCluster.clusterCumulativeScore);\n if (classification === Handlers.ModelHandlers.PageLoadMetrics.ScoreClassification.GOOD) {\n state = 'informative';\n } else {\n state = 'fail';\n }\n }\n\n return {\n insightKey: InsightKeys.CLS_CULPRITS,\n strings: UIStrings,\n title: i18nString(UIStrings.title),\n description: i18nString(UIStrings.description),\n category: InsightCategory.CLS,\n state,\n ...partialModel,\n };\n}\n\nexport function generateInsight(\n parsedTrace: Handlers.Types.ParsedTrace, context: InsightSetContext): CLSCulpritsInsightModel {\n const isWithinContext = (event: Types.Events.Event): boolean => Helpers.Timing.eventIsInBounds(event, context.bounds);\n\n const compositeAnimationEvents = parsedTrace.Animations.animations.filter(isWithinContext);\n const iframeEvents = parsedTrace.LayoutShifts.renderFrameImplCreateChildFrameEvents.filter(isWithinContext);\n const networkRequests = parsedTrace.NetworkRequests.byTime.filter(isWithinContext);\n const domLoadingEvents = parsedTrace.LayoutShifts.domLoadingEvents.filter(isWithinContext);\n const unsizedImageEvents = parsedTrace.LayoutShifts.layoutImageUnsizedEvents.filter(isWithinContext);\n\n const clusterKey = context.navigation ? context.navigationId : Types.Events.NO_NAVIGATION;\n const clusters = parsedTrace.LayoutShifts.clustersByNavigationId.get(clusterKey) ?? [];\n const clustersByScore = [...clusters].sort((a, b) => b.clusterCumulativeScore - a.clusterCumulativeScore);\n const worstCluster = clustersByScore.at(0);\n const layoutShifts = clusters.flatMap(cluster => cluster.events);\n const prePaintEvents = parsedTrace.LayoutShifts.prePaintEvents.filter(isWithinContext);\n const paintImageEvents = parsedTrace.LayoutShifts.paintImageEvents.filter(isWithinContext);\n\n // Get root causes.\n const rootCausesByShift = new Map<Types.Events.SyntheticLayoutShift, LayoutShiftRootCausesData>();\n const shiftsByPrePaint = getShiftsByPrePaintEvents(layoutShifts, prePaintEvents);\n\n for (const shift of layoutShifts) {\n rootCausesByShift.set(shift, {iframes: [], webFonts: [], nonCompositedAnimations: [], unsizedImages: []});\n }\n\n // Populate root causes for rootCausesByShift.\n getIframeRootCauses(parsedTrace, iframeEvents, prePaintEvents, shiftsByPrePaint, rootCausesByShift, domLoadingEvents);\n getFontRootCauses(networkRequests, prePaintEvents, shiftsByPrePaint, rootCausesByShift);\n getUnsizedImageRootCauses(unsizedImageEvents, paintImageEvents, shiftsByPrePaint, rootCausesByShift);\n const animationFailures =\n getNonCompositedFailureRootCauses(compositeAnimationEvents, prePaintEvents, shiftsByPrePaint, rootCausesByShift);\n\n const relatedEvents: Types.Events.Event[] = [...layoutShifts];\n if (worstCluster) {\n relatedEvents.push(worstCluster);\n }\n\n const topCulpritsByCluster = new Map<Types.Events.SyntheticLayoutShiftCluster, LayoutShiftItem[]>();\n for (const cluster of clusters) {\n topCulpritsByCluster.set(cluster, getTopCulprits(cluster, rootCausesByShift));\n }\n\n return finalize({\n relatedEvents,\n animationFailures,\n shifts: rootCausesByShift,\n clusters,\n worstCluster,\n topCulpritsByCluster,\n });\n}\n\nexport function createOverlays(model: CLSCulpritsInsightModel): Types.Overlays.Overlay[] {\n const clustersByScore = model.clusters.toSorted((a, b) => b.clusterCumulativeScore - a.clusterCumulativeScore) ?? [];\n const worstCluster = clustersByScore[0];\n if (!worstCluster) {\n return [];\n }\n\n const range = Types.Timing.Micro(worstCluster.dur ?? 0);\n const max = Types.Timing.Micro(worstCluster.ts + range);\n\n return [{\n type: 'TIMESPAN_BREAKDOWN',\n sections: [\n {\n bounds: {min: worstCluster.ts, range, max},\n label: i18nString(UIStrings.worstLayoutShiftCluster),\n showDuration: false,\n },\n ],\n // This allows for the overlay to sit over the layout shift.\n entry: worstCluster.events[0],\n renderLocation: 'ABOVE_EVENT',\n }];\n}\n"]} |