{/* Render count and sum of render durations */}

{name}

Renders {value.renderCount}

Duration {value.sumOfRenderDurations.toFixed(0)}ms

{/* Area for Text Labels (Above Bar) */}

{processedPointsForDisplay.map( ({ pointData: point, lane: currentLane }) => { const leftPercent = point.time * scale let transform = 'translateX(-50%)' if (leftPercent < LABEL_ALIGN_LOW_THRESHOLD) transform = 'translateX(0%)' else if (leftPercent > LABEL_ALIGN_HIGH_THRESHOLD) transform = 'translateX(-100%)' return (

{point.name}

) }, )}

{/* Timeline Bar */}

{validBarSegments.map((seg) => { const segmentWidthPercent = (seg.end - seg.start) * scale const segmentLeftPercent = seg.start * scale if (segmentWidthPercent <= 0) return null return (

) })}

{/* Area for Time Values (Below Bar) */}

{processedPointsForDisplay.map( ({ pointData: point, lane: currentLane }) => { if (point.name === 'start' && point.time === 0) return null const leftPercent = point.time * scale let transform = 'translateX(-50%)' if (leftPercent < LABEL_ALIGN_LOW_THRESHOLD) transform = 'translateX(0%)' else if (leftPercent > LABEL_ALIGN_HIGH_THRESHOLD) transform = 'translateX(-100%)' return (

+{point.time.toFixed(0)}ms

) }, )}

{/* Vertical Marker Lines spanning all areas */} {uniqueTimesForLines.map((timeVal) => { // Find any point config for color, preferably from original list for consistency const pointConfig = timePointsForDisplay.find((p) => p.time === timeVal) ?? timePointsForDisplay[0]! const leftPercent = timeVal * scale let lineLeftPositionStyle = `${leftPercent}%` let lineTransformStyle = 'translateX(-50%)' if (leftPercent < MARKER_LINE_ALIGN_LOW_THRESHOLD) { lineLeftPositionStyle = '0%' lineTransformStyle = 'translateX(0)' } else if (leftPercent > MARKER_LINE_ALIGN_HIGH_THRESHOLD) { lineLeftPositionStyle = `calc(100% - ${MARKER_LINE_WIDTH}px)` lineTransformStyle = 'translateX(0)' } return (

) })}

) } // Helper to render ComputedRenderBeaconSpans nicely function RenderComputedRenderBeaconSpans({ computedRenderBeaconSpans, }: { computedRenderBeaconSpans: Record }) { // if (Object.keys(computedRenderBeaconSpans).length === 0) return null return (

Computed Render Beacon Spans:

) } // Function to download trace recording as a JSON file function downloadTraceRecording< RelationSchemasT extends RelationSchemasBase, >(trace: TraceInfo) { if (!trace.traceContext || !trace.finalTransition) { return } try { // Generate the trace recording const recording = createTraceRecording( trace.traceContext, trace.finalTransition, ) // Create a blob with the JSON data const recordingJson = JSON.stringify(recording, null, 2) const blob = new Blob([recordingJson], { type: 'application/json' }) // Create download link const url = URL.createObjectURL(blob) const a = document.createElement('a') a.href = url a.download = `trace-${trace.traceId}-${trace.traceName}.json` document.body.append(a) a.click() // Clean up setTimeout(() => { a.remove() URL.revokeObjectURL(url) }, 0) } catch (error) { // eslint-disable-next-line no-console console.error('Failed to generate trace recording:', error) } } // TraceItem component to display a trace (used for both active and history traces) function TraceItem< RelationSchemasT extends RelationSchemasBase, >({ trace, isExpanded, onToggleExpand, isCurrentTrace = false, }: { trace: TraceInfo isExpanded: boolean onToggleExpand: () => void isCurrentTrace?: boolean }) { const [isHovered, setIsHovered] = useState(false) const [isDefinitionDetailsExpanded, setIsDefinitionDetailsExpanded] = useState(false) // Determine if we can download a trace recording (only for completed/interrupted traces) const canDownloadRecording = (trace.state === 'complete' || trace.state === 'interrupted') && !!trace.traceContext && !!trace.finalTransition // Memoize computed results for this trace const computedResults = useMemo(() => { if (trace.traceContext && trace.finalTransition) { const results = getComputedResults( trace.traceContext, trace.finalTransition, ) return results } return {} }, [trace.traceContext, trace.finalTransition]) // Handle download button click without triggering the expand/collapse const handleDownloadClick = (e: React.MouseEvent) => { e.stopPropagation() downloadTraceRecording(trace) } return (

void setIsHovered(true)} onMouseLeave={() => void setIsHovered(false)} > {/* ROW 1: Title, state, buttons, and IDs */}

{trace.traceName} {trace.state} {canDownloadRecording && ( )} {/* Error indicator */} {(trace.hasErrorSpan || trace.hasSuppressedErrorSpan) && ( ⚠️ )} {/* Definition modification indicator */} {trace.definitionModifications && trace.definitionModifications.length > 0 && ( 🔧 )}

({formatMs(trace.liveDuration)})

{trace.traceId}

{new Date(trace.startTime).toLocaleTimeString()}

{/* ROW 2: Main trace information */}

{/* Variant in chip group */}

Variant {trace.variant}

{/* Required spans in chip group */}

Required {trace.requiredSpans.filter((s) => s.isMatched).length}/ {trace.requiredSpans.length}

{/* Group related items together */} {trace.relatedTo && Object.keys(trace.relatedTo).length > 0 && (

{Object.entries(trace.relatedTo).map(([key, value]) => ( {key}: {JSON.stringify(value)} ))}

)} {/* Interruption reason in chip group */} {trace.interruptionReason && (

Reason {trace.interruptionReason}

)} {/* Span count chip */} Spans: {trace.totalSpanCount ?? 0}

{' '} {isExpanded && (

{ void e.stopPropagation() }} > {/* Computed Spans */} {(trace.computedSpans?.length ?? 0) > 0 && (

Computed Spans:

{name} {trace.state === 'complete' || trace.state === 'interrupted' ? ( value ? ( ) : ( missing ) ) : ( pending )}

)} {computedResults.computedRenderBeaconSpans ? ( ) : null} {/* Computed Values */} {(trace.computedValues?.length ?? 0) > 0 && (

Computed Values:

{name} {trace.state === 'complete' || trace.state === 'interrupted' ? ( value !== undefined ? ( {String(value)} ) : ( N/A ) ) : ( pending )}

)} {/* ROW 3: Definition details toggle */}

{ e.stopPropagation() setIsDefinitionDetailsExpanded((prev) => !prev) }} > {isDefinitionDetailsExpanded ? '−' : '+'} Definition Details

{/* Definition modifications details */} {isDefinitionDetailsExpanded && (

{/* Trace configuration information */}

Configuration:

{(() => { const { timeout, debounce, interactive } = trace.traceContext ? getConfigSummary(trace.traceContext) : {} return ( <> {timeout != null && ( Timeout: {formatMs(timeout)} )} {debounce != null && ( Debounce: {formatMs(debounce)} )} {interactive != null && ( Interactive: {formatMs(interactive)} )} ) })()}

{/* Definition modifications list */} {trace.definitionModifications && trace.definitionModifications.length > 0 && (

Definition Modifications:

{JSON.stringify(mod)}

)}

)} {/* Expand/collapse arrow indicator */}

▼

) } export interface TraceManagerDebuggerProps< RelationSchemasT extends RelationSchemasBase, > { traceManager: TraceManager float?: boolean traceHistoryLimit?: number } /** * A component that visualizes the current state of the TraceManager and its Traces */ // eslint-disable-next-line import/no-default-export export default function TraceManagerDebugger< RelationSchemasT extends RelationSchemasBase, >({ traceManager, float = false, traceHistoryLimit = TRACE_HISTORY_LIMIT, }: TraceManagerDebuggerProps) { const [currentTrace, setCurrentTrace] = useState | null>(null) const [traceHistory, setTraceHistory] = useState< TraceInfo[] >([]) const [expandedHistoryIndex, setExpandedHistoryIndex] = useState< number | null >(0) // For floating panel functionality const [position, setPosition] = useState({ x: 10, y: 10 }) const isDraggingRef = useRef(false) const dragOffsetRef = useRef({ x: 0, y: 0 }) const [isMinimized, setIsMinimized] = useState(false) const containerRef = useRef(null) const handleMouseDown = (e: React.MouseEvent) => { if (!containerRef.current) return // Prevent default browser behavior like text selection e.preventDefault() isDraggingRef.current = true // Calculate the offset from cursor to container top-left corner dragOffsetRef.current = { x: e.clientX - position.x, y: e.clientY - position.y, } } const handleMouseMove = (e: MouseEvent) => { if (!isDraggingRef.current) return // Prevent default behavior during dragging e.preventDefault() // Calculate new position by subtracting the initial offset requestAnimationFrame(() => { setPosition({ x: e.clientX - dragOffsetRef.current.x, y: e.clientY - dragOffsetRef.current.y, }) }) } const handleMouseUp = (e: MouseEvent) => { if (isDraggingRef.current) { // Prevent default only if we were dragging e.preventDefault() } isDraggingRef.current = false dragOffsetRef.current = { x: 0, y: 0 } } useEffect(() => { if (float) { window.addEventListener('mousemove', handleMouseMove) window.addEventListener('mouseup', handleMouseUp) return () => { window.removeEventListener('mousemove', handleMouseMove) window.removeEventListener('mouseup', handleMouseUp) } } return undefined }, [float]) useEffect(() => { // schedule updates asynchronously so we never call setState mid‐render const schedule = (fn: () => void) => void setTimeout(fn, 0) // Create a map to store spans for each trace by ID const traceEntriesMap = new Map< string, SpanAndAnnotation[] >() // Subscribe to trace-start events const startSub = traceManager.when('trace-start').subscribe((event) => { const trace = event.traceContext as AllPossibleTraces const traceId = trace.input.id // Create a new entry array for this trace (or clear existing) traceEntriesMap.set(traceId, []) const traceInfo: TraceInfo = { traceId, traceName: trace.definition.name, variant: trace.input.variant as string, state: trace.stateMachine.currentState, startTime: trace.input.startTime.epoch, attributes: trace.input.attributes ? { ...trace.input.attributes } : undefined, relatedTo: trace.input.relatedTo ? { ...trace.input.relatedTo } : undefined, requiredSpans: trace.definition.requiredSpans.map((matcher, index) => { const name = formatMatcher(matcher, index) return { name, isMatched: false, definition: (matcher.fromDefinition as Record) ?? undefined, } }), traceContext: { definition: trace.definition, input: trace.input, recordedItemsByLabel: trace.recordedItemsByLabel, recordedItems: new Set(trace.recordedItems), }, // New fields for live info liveDuration: 0, totalSpanCount: 0, hasErrorSpan: false, hasSuppressedErrorSpan: false, definitionModifications: [], computedSpans: Object.keys( trace.definition.computedSpanDefinitions ?? {}, ), computedValues: Object.keys( trace.definition.computedValueDefinitions ?? {}, ), } schedule(() => void setCurrentTrace(traceInfo)) }) // Subscribe to state transition events const stateSub = traceManager .when('state-transition') .subscribe((event) => { const trace = event.traceContext as AllPossibleTraces const transition = event.stateTransition const partialNewTrace = { traceContext: { definition: trace.definition, input: trace.input, recordedItemsByLabel: trace.recordedItemsByLabel, recordedItems: new Set(trace.recordedItems), }, state: transition.transitionToState, attributes: trace.input.attributes ? { ...trace.input.attributes } : undefined, relatedTo: trace.input.relatedTo ? { ...trace.input.relatedTo } : undefined, } as const schedule( () => void setCurrentTrace((prevTrace) => { if (!prevTrace || prevTrace.traceId !== trace.input.id) return prevTrace const updatedTrace: TraceInfo = { ...prevTrace, ...partialNewTrace, } if ('interruptionReason' in transition) { updatedTrace.interruptionReason = transition.interruptionReason } if ( 'lastRequiredSpanAndAnnotation' in transition && transition.lastRequiredSpanAndAnnotation ) { updatedTrace.lastRequiredSpanOffset = transition.lastRequiredSpanAndAnnotation.annotation.operationRelativeEndTime } if ( 'completeSpanAndAnnotation' in transition && transition.completeSpanAndAnnotation ) { updatedTrace.completeSpanOffset = transition.completeSpanAndAnnotation.annotation.operationRelativeEndTime } if ( 'cpuIdleSpanAndAnnotation' in transition && transition.cpuIdleSpanAndAnnotation ) { updatedTrace.cpuIdleSpanOffset = transition.cpuIdleSpanAndAnnotation.annotation.operationRelativeEndTime } // Terminal states - add to history if (isTerminalState(transition.transitionToState)) { setTraceHistory((prev) => { updatedTrace.finalTransition = transition as FinalTransition const newHistory = [updatedTrace, ...prev] return newHistory.slice(0, traceHistoryLimit) }) return null } return updatedTrace }), ) }) // Subscribe to required span seen events const spanSeenSub = traceManager .when('required-span-seen') .subscribe((event) => { const trace = event.traceContext as AllPossibleTraces schedule( () => void setCurrentTrace((prevTrace) => { if (!prevTrace || prevTrace.traceId !== trace.input.id) { return prevTrace } // Find which required span was matched by comparing against all matchers const updatedRequiredSpans = [...prevTrace.requiredSpans] const matchedSpan = event.spanAndAnnotation trace.definition.requiredSpans.forEach((matcher, index) => { if (matcher(matchedSpan, trace)) { updatedRequiredSpans[index] = { ...updatedRequiredSpans[index]!, isMatched: true, } } }) return { ...prevTrace, requiredSpans: updatedRequiredSpans, } }), ) }) // Subscribe to add-span-to-recording for live info const addSpanSub = traceManager .when('add-span-to-recording') .subscribe((event) => { // Add the span to the trace entries map regardless of current UI state const trace = event.traceContext const traceId = trace.input.id // Get or initialize entries array for this specific trace if (!traceEntriesMap.has(traceId)) { traceEntriesMap.set(traceId, []) } const entries = traceEntriesMap.get(traceId)! entries.push(event.spanAndAnnotation) // Now update the UI if this is the currently displayed trace schedule( () => void setCurrentTrace((prevTrace) => { if (!prevTrace) return prevTrace if (traceId !== prevTrace.traceId) { return prevTrace } const liveDuration = entries.length > 0 ? Math.round( Math.max( ...entries.map( (e) => e.span.startTime.epoch + e.span.duration, ), ) - trace.input.startTime.epoch, ) : 0 const totalSpanCount = entries.length const hasErrorSpan = entries.some( (e) => e.span.status === 'error' && !isSuppressedError(trace, e), ) const hasSuppressedErrorSpan = entries.some( (e) => e.span.status === 'error' && isSuppressedError(trace, e), ) return { ...prevTrace, liveDuration, totalSpanCount, hasErrorSpan, hasSuppressedErrorSpan, } }), ) }) // Subscribe to definition-modified for modification indicator const defModSub = traceManager .when('definition-modified') .subscribe( ({ traceContext: trace, modifications: eventModifications }) => { schedule( () => void setCurrentTrace((prevTrace) => { if (!prevTrace) return prevTrace if (trace.input.id !== prevTrace.traceId) return prevTrace return { ...prevTrace, traceContext: { definition: trace.definition, input: trace.input, recordedItemsByLabel: trace.recordedItemsByLabel, recordedItems: new Set(trace.recordedItems), }, definitionModifications: [ ...(prevTrace.definitionModifications ?? []), eventModifications, ], } }), ) }, ) return () => { startSub.unsubscribe() stateSub.unsubscribe() spanSeenSub.unsubscribe() addSpanSub.unsubscribe() defModSub.unsubscribe() } }, [traceManager, traceHistoryLimit]) const allTraces = currentTrace ? [currentTrace, ...traceHistory] : traceHistory if (float && isMinimized) { return ( ) } const content = ( <> {float && (

{NAME}

)} {!float && (

{NAME}

)} {allTraces.length > 0 ? (

Traces ({allTraces.length}) Trace Visualizer

{allTraces.map((trace, index) => ( void setExpandedHistoryIndex( expandedHistoryIndex === index ? null : index, ) } /> ))}

) : (

No traces running or completed

)} ) if (float) { return (

{content}

) } return

{content}

}