{"version":3,"sources":["../src/react/ScrollSequence.tsx","../src/react/useScrollSequence.ts","../src/controllers/imageController.ts","../src/sequence/sequenceResolver.ts","../src/core/clamp.ts","../src/react/scrollTimelineContext.ts","../src/react/useScrollTimeline.ts","../src/react/ScrollTimelineProvider.tsx","../src/core/loopManager.ts","../src/constants.ts","../src/core/scrollTimeline.ts","../src/react/ScrollText.tsx","../src/react/ScrollWordReveal.tsx"],"sourcesContent":["import React, { useRef } from 'react';\nimport type { ScrollSequenceProps } from '../types';\nimport { useScrollSequence } from './useScrollSequence';\nimport { ScrollTimelineProvider } from './ScrollTimelineProvider';\n\n\ninterface InnerSequenceProps {\n source: ScrollSequenceProps['source'];\n debug: boolean;\n memoryStrategy: ScrollSequenceProps['memoryStrategy'];\n lazyBuffer?: number;\n accessibilityLabel?: string;\n fit?: React.CSSProperties['objectFit']; // Add fit prop here\n fallback?: React.ReactNode;\n onError?: (error: Error) => void;\n}\n\nconst InnerSequence: React.FC = ({\n source,\n debug,\n memoryStrategy,\n lazyBuffer,\n accessibilityLabel = \"Scroll sequence\",\n fit = 'cover', // Default to cover\n fallback,\n onError\n}) => {\n const debugRef = useRef(null);\n const { canvasRef, isLoaded } = useScrollSequence({\n source,\n debugRef,\n memoryStrategy,\n lazyBuffer,\n onError\n });\n\n // Fallback logic could be handled here or by parent.\n // If we handle it here, we overlay it?\n // Actually, canvas opacity handles the fade-in.\n // Use fallback if provided and not loaded.\n\n const canvasStyle: React.CSSProperties = {\n display: 'block',\n width: '100%',\n height: '100%',\n objectFit: fit, // Use the prop\n opacity: isLoaded ? 1 : 0,\n transition: 'opacity 0.2s ease-in',\n };\n\n const debugStyle: React.CSSProperties = {\n position: 'absolute',\n top: '10px',\n left: '10px',\n background: 'rgba(0, 0, 0, 0.7)',\n color: '#00ff00',\n padding: '8px',\n borderRadius: '4px',\n fontFamily: 'monospace',\n fontSize: '12px',\n pointerEvents: 'none',\n whiteSpace: 'pre-wrap',\n zIndex: 9999,\n };\n\n return (\n <>\n {/* Render fallback behind canvas, or replace? \n If replace, we might loose the canvas ref init?\n Better to render both and cross-fade or just hide fallback when loaded.\n */}\n {!isLoaded && fallback && (\n
\n {fallback}\n
\n )}\n\n \n {debug &&
Waiting for scroll...
}\n \n );\n};\n\nexport const ScrollSequence = React.forwardRef(\n (props, ref) => {\n const {\n source,\n scrollLength = '300vh',\n className = '',\n debug = false,\n memoryStrategy = 'eager',\n lazyBuffer = 10,\n fallback,\n fit = 'cover', // Default here too\n accessibilityLabel,\n onError,\n children // Extract children\n } = props;\n\n // Check for reduced motion\n // ... logic for reduced motion could be here or inside hook\n\n return (\n }\n >\n \n {/* Render children ON TOP of canvas */}\n
\n {children}\n
\n \n );\n }\n);\n","import { useRef, useEffect, useState } from 'react';\nimport type { ScrollSequenceProps } from '../types';\nimport { ImageController } from '../controllers/imageController';\nimport { resolveSequence } from '../sequence/sequenceResolver';\nimport { clamp } from '../core/clamp';\nimport { useScrollTimeline } from './useScrollTimeline';\n\ninterface UseScrollSequenceParams {\n source: ScrollSequenceProps['source'];\n debugRef?: React.MutableRefObject;\n memoryStrategy?: 'eager' | 'lazy';\n lazyBuffer?: number;\n onError?: (error: Error) => void;\n}\n\n/**\n * Hook to manage image sequence in a timeline context.\n * MUST be used inside ScrollTimelineProvider.\n */\nexport function useScrollSequence({\n source,\n debugRef,\n memoryStrategy = 'eager',\n lazyBuffer = 10,\n onError,\n}: UseScrollSequenceParams) {\n const canvasRef = useRef(null);\n const controllerRef = useRef(null);\n \n // Use the shared timeline\n const { subscribe } = useScrollTimeline();\n\n const [isLoaded, setIsLoaded] = useState(false);\n const [error, setError] = useState(null);\n\n useEffect(() => {\n let active = true;\n let currentController: ImageController | null = null;\n let unsubscribeTimeline: (() => void) | null = null;\n\n const init = async () => {\n setIsLoaded(false);\n setError(null);\n\n const canvas = canvasRef.current;\n if (!canvas) return;\n\n try {\n // 1. Resolve Sequence\n // Guard: source change handled by effect dep, but verify environment?\n if (typeof window === 'undefined') return;\n\n const sequence = await resolveSequence(source);\n if (!active) return;\n\n if (sequence.frames.length === 0) {\n return;\n }\n\n // 2. Setup Dimensions (Initial)\n if (typeof window !== 'undefined') {\n canvas.width = window.innerWidth;\n canvas.height = window.innerHeight;\n }\n\n // 3. Initialize Controller\n currentController = new ImageController({\n canvas,\n frames: sequence.frames,\n strategy: memoryStrategy,\n bufferSize: lazyBuffer\n });\n controllerRef.current = currentController;\n\n // 4. Subscribe to Timeline\n unsubscribeTimeline = subscribe((progress) => {\n if (!currentController) return;\n const clamped = clamp(progress);\n currentController.update(clamped);\n\n // Debug Overlay\n if (debugRef?.current) {\n const frameIndex = Math.floor(clamped * (sequence.frames.length - 1));\n debugRef.current.innerText = `Progress: ${clamped.toFixed(2)}\\nFrame: ${frameIndex + 1} / ${sequence.frames.length}`;\n }\n });\n\n if (active) setIsLoaded(true);\n\n } catch (err) {\n if (active) {\n const e = err instanceof Error ? err : new Error('Unknown initialization error');\n setError(e);\n if (onError) onError(e);\n }\n }\n };\n\n init();\n\n return () => {\n active = false;\n currentController?.destroy();\n controllerRef.current = null;\n if (unsubscribeTimeline) unsubscribeTimeline();\n };\n }, [source, memoryStrategy, lazyBuffer, subscribe]); // Re-run if source or timeline changes\n\n return {\n canvasRef,\n isLoaded,\n error\n };\n}\n","/**\n * ImageController\n * Manages canvas rendering, image loading, and frame-by-frame drawing.\n * Handles preloading and caching to minimize redraws.\n */\n\nexport interface ImageControllerConfig {\n /** HTMLCanvasElement to draw on */\n canvas: HTMLCanvasElement;\n\n /** Array of sorted frame URLs */\n frames: string[];\n\n /** Memory management strategy */\n strategy?: 'eager' | 'lazy';\n\n /** Lazy load buffer size (default 10) */\n bufferSize?: number;\n}\n\nexport class ImageController {\n private canvas: HTMLCanvasElement;\n private ctx: CanvasRenderingContext2D;\n private frames: string[];\n private imageCache = new Map();\n private loadingPromises = new Map>();\n private currentFrameIndex = -1;\n private strategy: 'eager' | 'lazy';\n private bufferSize: number;\n\n /**\n * Create a new ImageController instance.\n *\n * @param config - Configuration object\n * @throws If canvas doesn't support 2D context\n */\n private isDestroyed = false;\n\n constructor(config: ImageControllerConfig) {\n this.canvas = config.canvas;\n this.frames = config.frames;\n this.strategy = config.strategy || 'eager';\n this.bufferSize = config.bufferSize || 10;\n\n const ctx = this.canvas.getContext('2d');\n if (!ctx) {\n throw new Error('Failed to get 2D context from canvas');\n }\n this.ctx = ctx;\n\n // Initial load\n if (this.strategy === 'eager') {\n this.preloadAll();\n } else {\n this.ensureFrameWindow(0);\n }\n }\n\n // ... preloadAll omitted for brevity if unchanged, but let's include for completeness if needed.\n // Actually, we need to add guards to preloadFrame, so let's check it.\n \n private preloadAll(): void {\n this.frames.forEach((_, index) => this.preloadFrame(index));\n }\n\n private ensureFrameWindow(currentIndex: number): void {\n if (this.isDestroyed) return;\n\n const radius = this.bufferSize;\n const start = Math.max(0, currentIndex - radius);\n const end = Math.min(this.frames.length - 1, currentIndex + radius);\n \n const needed = new Set();\n for (let i = start; i <= end; i++) {\n needed.add(this.frames[i]);\n }\n\n // Cleanup unused frames (LRU-ish but simple Window-based)\n for (const [src] of this.imageCache) {\n if (!needed.has(src)) {\n this.imageCache.delete(src);\n // We should also cancel promises if possible, but we can't cancel a fetch/image load easily.\n // We just delete the tracking so we don't cache it when it lands.\n this.loadingPromises.delete(src);\n }\n }\n\n // Load needed\n for (let i = start; i <= end; i++) {\n void this.preloadFrame(i);\n }\n }\n\n async preloadFrame(index: number): Promise {\n if (this.isDestroyed || index < 0 || index >= this.frames.length) return;\n\n const src = this.frames[index];\n\n if (this.imageCache.has(src)) return;\n\n // Deduplication: Reuse existing promise if allowed\n if (!this.loadingPromises.has(src)) {\n this.loadingPromises.set(src, this.loadImage(src));\n }\n\n try {\n await this.loadingPromises.get(src);\n } catch {\n // Failed\n if (!this.isDestroyed) {\n // Silent failure\n }\n }\n }\n\n private loadImage(src: string): Promise {\n return new Promise((resolve, reject) => {\n const img = new Image();\n \n img.onload = () => {\n if (this.isDestroyed) return;\n \n // Critical: decode() to prevent main-thread jank during draw\n img.decode()\n .then(() => {\n if (this.isDestroyed) return;\n this.imageCache.set(src, img);\n resolve(img);\n })\n .catch(() => {\n if (this.isDestroyed) return;\n // Even if decode fails, the image might be usable\n this.imageCache.set(src, img);\n resolve(img);\n });\n };\n\n img.onerror = () => {\n if (this.isDestroyed) return;\n reject(new Error(`Failed to load image: ${src}`));\n };\n\n img.src = src;\n });\n }\n\n update(progress: number): void {\n if (this.isDestroyed || this.frames.length === 0) return;\n\n const frameIndex = Math.floor(progress * (this.frames.length - 1));\n\n if (this.strategy === 'lazy') {\n this.ensureFrameWindow(frameIndex);\n }\n\n if (frameIndex === this.currentFrameIndex) return;\n\n this.currentFrameIndex = frameIndex;\n this.drawFrame(frameIndex);\n }\n\n private drawFrame(index: number): void {\n if (this.isDestroyed || index < 0 || index >= this.frames.length) return;\n\n const src = this.frames[index];\n const img = this.imageCache.get(src);\n\n if (!img) {\n // Frame not ready. Optional: Show loading spinner or keep previous frame?\n // For now, keep previous (natural behavior of canvas).\n // Or check promise\n const promise = this.loadingPromises.get(src);\n if (promise) {\n promise.then(() => {\n if (this.currentFrameIndex === index) {\n this.drawFrame(index);\n }\n }).catch(() => {}); // catch ignore\n }\n return;\n }\n\n this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);\n\n const scale = Math.min(\n this.canvas.width / img.width,\n this.canvas.height / img.height\n );\n\n const scaledWidth = img.width * scale;\n const scaledHeight = img.height * scale;\n const x = (this.canvas.width - scaledWidth) / 2;\n const y = (this.canvas.height - scaledHeight) / 2;\n\n this.ctx.drawImage(img, x, y, scaledWidth, scaledHeight);\n }\n\n setCanvasSize(width: number, height: number): void {\n if (this.isDestroyed) return;\n this.canvas.width = width;\n this.canvas.height = height;\n if (this.currentFrameIndex >= 0) {\n this.drawFrame(this.currentFrameIndex);\n }\n }\n\n destroy(): void {\n this.isDestroyed = true;\n this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);\n this.imageCache.clear();\n this.loadingPromises.clear();\n }\n}\n","/**\n * SequenceResolver\n * Handles intelligent frame resolution from multiple input sources:\n * - Manual frame list (frames[])\n * - Pattern generation (pattern, start, end, pad)\n * - Remote manifest (manifest URL)\n *\n * Security Features (v1.0.5+):\n * - HTTPS-only enforcement for manifest URLs\n * - Credential isolation (credentials: 'omit')\n * - Referrer policy (no-referrer)\n * - Response size limit (1MB)\n * - Frame URL whitelist validation (only http:/https:/relative paths allowed)\n * - Protocol-relative URL rejection (//evil.com blocked)\n * - Configurable frame count cap (default 2000, max 8000)\n * - Manifest cache size limit (50 entries)\n * - 10-second timeout protection\n * - Content-type and structure validation\n */\n\nimport type { ScrollSequenceProps, ResolvedSequence } from '../types';\n\n// Declare process for TS (avoiding @types/node dependency for just this)\ndeclare const process: { env: { NODE_ENV: string; REACT_SCROLL_MEDIA_MAX_FRAMES?: string } };\n\n/**\n * Resolves frame sequence from props.\n * Prioritizes: frames > pattern > manifest\n */\n/**\n * Resolves frame sequence from props.\n * Handles 'manual', 'pattern', and 'manifest' sources.\n */\nexport async function resolveSequence(source: ScrollSequenceProps['source']): Promise {\n switch (source.type) {\n case 'manual':\n return processManualFrames(source.frames);\n \n case 'pattern':\n return processPatternMode(source.url, source.start ?? 1, source.end, source.pad);\n \n case 'manifest':\n return processManifestMode(source.url);\n \n default:\n return { frames: [], frameCount: 0 };\n }\n}\n\n/**\n * Allowed URL protocols for frame URLs (whitelist approach).\n * Only http: and https: are permitted. Relative paths are also safe.\n */\nconst ALLOWED_PROTOCOLS = new Set(['http:', 'https:']);\n\n/**\n * Frame count limits.\n * DEFAULT_MAX_FRAMES: Safe default for most use cases.\n * ABSOLUTE_MAX_FRAMES: Hard ceiling that cannot be exceeded, even with env override.\n * Override via REACT_SCROLL_MEDIA_MAX_FRAMES environment variable.\n */\nconst DEFAULT_MAX_FRAMES = 2000;\nconst ABSOLUTE_MAX_FRAMES = 8000;\n\n/**\n * Returns the effective max frame count.\n * Checks REACT_SCROLL_MEDIA_MAX_FRAMES env var for power-user override,\n * clamped to ABSOLUTE_MAX_FRAMES.\n */\nfunction getMaxFrames(): number {\n try {\n const env = Number(process.env.REACT_SCROLL_MEDIA_MAX_FRAMES);\n if (Number.isInteger(env) && env > 0) {\n return Math.min(env, ABSOLUTE_MAX_FRAMES);\n }\n } catch {\n // process.env may not exist in all environments\n }\n return DEFAULT_MAX_FRAMES;\n}\n\n/**\n * Validates a frame URL is safe to load using a whitelist approach.\n * Only allows http:, https:, and relative paths (starting with / or alphanumeric).\n * Rejects protocol-relative URLs (//), javascript:, data:, blob:, etc.\n */\nfunction validateFrameUrl(url: string): boolean {\n const trimmed = url.trim();\n if (!trimmed) return false;\n\n // Security: Reject protocol-relative URLs (e.g. //evil.com/image.jpg)\n // These resolve to the current page's protocol and can point to arbitrary hosts\n if (trimmed.startsWith('//')) return false;\n\n try {\n // Parse URL — relative paths resolve against localhost base\n const parsed = new URL(trimmed, 'https://localhost');\n\n // Only allow http: and https: protocols\n if (!ALLOWED_PROTOCOLS.has(parsed.protocol)) return false;\n\n // For absolute URLs, ensure the host isn't our dummy localhost base\n // (which would mean it was a relative path — those are fine)\n return true;\n } catch {\n // If URL parsing fails entirely, reject it\n return false;\n }\n}\n\n/**\n * Sanitize frame URLs, filtering out any with non-whitelisted protocols.\n * Logs a warning in development for rejected URLs.\n */\nfunction sanitizeFrameUrls(frames: string[]): string[] {\n return frames.filter(url => {\n if (!validateFrameUrl(url)) {\n try { if (process.env.NODE_ENV !== 'production') console.warn(`[react-scroll-media] Blocked unsafe frame URL: ${url}`); } catch {}\n return false;\n }\n return true;\n });\n}\n\n/**\n * Mode A: Process manually provided frames\n */\nfunction processManualFrames(frames: string[]): ResolvedSequence {\n // Security: Sanitize frame URLs\n const safe = sanitizeFrameUrls(frames);\n\n // Security: Enforce max frame count\n const maxFrames = getMaxFrames();\n if (safe.length > maxFrames) {\n throw new Error(`[react-scroll-media] Too many frames: ${safe.length} (max ${maxFrames}). Override with REACT_SCROLL_MEDIA_MAX_FRAMES env var (ceiling: ${ABSOLUTE_MAX_FRAMES}).`);\n }\n\n // Sort frames numerically by extracting numbers from filenames\n const sorted = [...safe].sort((a, b) => {\n const numA = extractNumber(a);\n const numB = extractNumber(b);\n return numA - numB;\n });\n\n return {\n frames: sorted,\n frameCount: sorted.length\n };\n}\n\n/**\n * Mode B: Generate frames from pattern\n */\nfunction processPatternMode(pattern: string, start: number, end: number, pad?: number): ResolvedSequence {\n // Security: Validate the pattern URL template itself\n if (!validateFrameUrl(pattern)) {\n throw new Error('[react-scroll-media] Pattern URL uses a disallowed protocol');\n }\n\n // Security: Enforce max frame count\n const frameCount = end - start + 1;\n const maxFrames = getMaxFrames();\n if (frameCount > maxFrames) {\n throw new Error(`[react-scroll-media] Too many frames: ${frameCount} (max ${maxFrames}). Override with REACT_SCROLL_MEDIA_MAX_FRAMES env var (ceiling: ${ABSOLUTE_MAX_FRAMES}).`);\n }\n\n const frames: string[] = [];\n\n for (let i = start; i <= end; i++) {\n let indexStr = i.toString();\n if (pad) {\n indexStr = indexStr.padStart(pad, '0');\n }\n frames.push(pattern.replace('{index}', indexStr));\n }\n\n return {\n frames,\n frameCount: frames.length\n };\n}\n\n/**\n * Mode C: Fetch and process manifest\n * \n * Security Features:\n * - HTTPS enforcement (no HTTP allowed)\n * - 10-second timeout protection\n * - User-Agent header identification\n * - Response structure validation\n */\nconst manifestCache = new Map>();\nconst MANIFEST_FETCH_TIMEOUT_MS = 10000; // 10 seconds\nconst MANIFEST_MAX_SIZE_BYTES = 1_048_576; // 1MB response size limit\nconst MANIFEST_CACHE_MAX_ENTRIES = 50; // Prevent unbounded cache growth\nconst USER_AGENT = 'react-scroll-media/1.0.5';\n\nasync function processManifestMode(url: string): Promise {\n if (manifestCache.has(url)) {\n return manifestCache.get(url)!;\n }\n\n const promise = (async () => {\n try {\n // Security: HTTPS validation\n if (!url.startsWith('https://')) {\n throw new Error('[react-scroll-media] Manifest URL must use HTTPS for security. Received: ' + url);\n }\n\n // Security: Abort controller for timeout protection\n const controller = new AbortController();\n const timeoutId = setTimeout(() => controller.abort(), MANIFEST_FETCH_TIMEOUT_MS);\n\n try {\n // Security: Fetch with credential isolation and referrer protection\n const res = await fetch(url, {\n signal: controller.signal,\n credentials: 'omit', // Never send cookies/auth tokens\n referrerPolicy: 'no-referrer', // Don't leak page URL\n headers: {\n 'Accept': 'application/json',\n 'User-Agent': USER_AGENT\n }\n });\n\n if (!res.ok) {\n throw new Error(`[react-scroll-media] Failed to fetch manifest: ${res.statusText}`);\n }\n\n // Security: Validate content-type header\n const contentType = res.headers.get('content-type');\n if (!contentType?.includes('application/json')) {\n throw new Error('[react-scroll-media] Invalid manifest response: expected application/json');\n }\n\n // Security: Enforce response size limit to prevent memory DoS\n const text = await res.text();\n if (text.length > MANIFEST_MAX_SIZE_BYTES) {\n throw new Error(`[react-scroll-media] Manifest response too large: ${text.length} bytes (max ${MANIFEST_MAX_SIZE_BYTES})`);\n }\n\n const data = JSON.parse(text);\n\n // Security: Validate response structure\n if (!data || typeof data !== 'object') {\n throw new Error('[react-scroll-media] Invalid manifest: expected JSON object');\n }\n\n // Check for \"frames\" array in manifest\n if (data.frames && Array.isArray(data.frames)) {\n if (data.frames.some((f: unknown) => typeof f !== 'string')) {\n throw new Error('[react-scroll-media] Invalid manifest: frames must be array of strings');\n }\n return processManualFrames(data.frames);\n }\n\n // Check for pattern config in manifest\n if (data.pattern && typeof data.end === 'number') {\n if (typeof data.pattern !== 'string') {\n throw new Error('[react-scroll-media] Invalid manifest: pattern must be string');\n }\n if (!Number.isInteger(data.end) || data.end < 1) {\n throw new Error('[react-scroll-media] Invalid manifest: end must be positive integer');\n }\n const start = data.start ?? 1;\n if (!Number.isInteger(start) || start < 1) {\n throw new Error('[react-scroll-media] Invalid manifest: start must be positive integer');\n }\n const pad = data.pad;\n if (pad !== undefined && (!Number.isInteger(pad) || pad < 1)) {\n throw new Error('[react-scroll-media] Invalid manifest: pad must be positive integer');\n }\n return processPatternMode(data.pattern, start, data.end, pad);\n }\n\n throw new Error('[react-scroll-media] Invalid manifest: missing frames or pattern configuration');\n\n } finally {\n clearTimeout(timeoutId);\n }\n\n } catch (err) {\n // Remove from cache on error so retry is possible\n manifestCache.delete(url);\n \n // Handle abort errors (timeout)\n if (err instanceof Error && err.name === 'AbortError') {\n throw new Error(`[react-scroll-media] Manifest fetch timeout: request took longer than ${MANIFEST_FETCH_TIMEOUT_MS}ms`);\n }\n \n throw err;\n }\n })();\n\n // Security: Enforce cache size limit to prevent memory DoS\n if (manifestCache.size >= MANIFEST_CACHE_MAX_ENTRIES) {\n // Evict the oldest entry (first key in Map insertion order)\n const oldestKey = manifestCache.keys().next().value;\n if (oldestKey) manifestCache.delete(oldestKey);\n }\n\n manifestCache.set(url, promise);\n return promise;\n}\n\n// --- Helpers ---\n\n/**\n * Extract the first number found in a filename.\n * Returns -1 if no number is found, to differentiate from 0.\n */\nfunction extractNumber(filename: string): number {\n const match = filename.match(/\\d+/);\n return match ? parseInt(match[0], 10) : -1;\n}\n\n","/**\n * Clamps a value between a minimum and maximum.\n * Default range is [0, 1], suitable for progress values.\n *\n * @param value - The value to clamp\n * @param min - Minimum value (default: 0)\n * @param max - Maximum value (default: 1)\n * @returns The clamped value\n */\nexport function clamp(value: number, min: number = 0, max: number = 1): number {\n return Math.max(min, Math.min(max, value));\n}\n","import { createContext, useContext } from 'react';\nimport { ScrollTimeline } from '../core/scrollTimeline';\n\nexport interface ScrollTimelineContextValue {\n timeline: ScrollTimeline | null;\n // Expose current progress? No, that causes re-renders. Use subscription.\n}\n\nexport const ScrollTimelineContext = createContext({\n timeline: null,\n});\n\nexport function useTimelineContext() {\n return useContext(ScrollTimelineContext);\n}\n","import { ScrollTimeline, TimelineCallback } from '../core/scrollTimeline';\nimport { useTimelineContext } from './scrollTimelineContext';\n\nexport interface UseScrollTimelineResult {\n /** \n * Manual subscription to the timeline. \n * Useful for low-level DOM updates (refs) without re-rendering.\n */\n subscribe: (callback: TimelineCallback) => () => void;\n \n /** The raw timeline instance (for advanced usage) */\n timeline: ScrollTimeline | null; \n}\n\nexport function useScrollTimeline(): UseScrollTimelineResult {\n const { timeline } = useTimelineContext();\n\n const subscribe = (callback: TimelineCallback) => {\n if (!timeline) return () => {};\n return timeline.subscribe(callback);\n };\n\n return { subscribe, timeline };\n}\n","import React, { useRef, useState } from 'react';\nimport { ScrollTimeline } from '../core/scrollTimeline';\nimport { ScrollTimelineContext } from './scrollTimelineContext';\n\nexport interface ScrollTimelineProviderProps {\n children: React.ReactNode;\n\n /** CSS height for the scroll container (e.g., \"300vh\"). */\n scrollLength?: string;\n\n\n className?: string;\n style?: React.CSSProperties;\n /** Optional ref for the container element. */\n containerRef?: React.RefObject;\n}\n\nexport function ScrollTimelineProvider({\n children,\n scrollLength = '300vh',\n className = '',\n style = {},\n containerRef: externalRef,\n}: ScrollTimelineProviderProps) {\n const internalRef = useRef(null);\n const containerRef = externalRef || internalRef;\n const [timeline, setTimeline] = useState(null);\n\n // Use layout effect to ensure timeline exists before children effects run\n // SSR safe fallback: use useEffect on server\n const useIsomorphicLayoutEffect = typeof window !== 'undefined' ? React.useLayoutEffect : React.useEffect;\n\n useIsomorphicLayoutEffect(() => {\n if (typeof window === 'undefined') return;\n if (!containerRef.current) return;\n\n // Future-proof: factory could be passed via props\n const instance = new ScrollTimeline(containerRef.current);\n\n // We do NOT call start() anymore, it starts on subscription\n // instance.start(); \n\n setTimeline(instance);\n\n return () => {\n instance.destroy();\n setTimeline(null);\n };\n }, []); // Dependencies? strict empty for one-time setup\n\n const containerStyle: React.CSSProperties = {\n height: scrollLength,\n position: 'relative',\n width: '100%',\n ...style,\n };\n\n const stickyWrapperStyle: React.CSSProperties = {\n position: 'sticky',\n top: 0,\n height: '100vh',\n width: '100%',\n overflow: 'hidden',\n };\n\n // Memoize context value to prevent unnecessary re-renders of consumers\n // when Parent component renders but timeline instance hasn't changed.\n const contextValue = React.useMemo(() => ({ timeline }), [timeline]);\n\n return (\n \n \n
\n {children}\n
\n \n \n );\n}\n","/**\n * ScrollLoopManager\n * \n * Singleton class to manage a single requestAnimationFrame loop\n * for all ScrollTimeline instances. This prevents multiple RAF\n * callbacks from piling up and degrading performance.\n */\n\ntype LoopCallback = () => void;\n\nexport class ScrollLoopManager {\n private static instance: ScrollLoopManager;\n private callbacks = new Set();\n private rafId: number | null = null;\n private isActive = false;\n\n private constructor() {}\n\n public static getInstance(): ScrollLoopManager {\n if (!ScrollLoopManager.instance) {\n ScrollLoopManager.instance = new ScrollLoopManager();\n }\n return ScrollLoopManager.instance;\n }\n\n /**\n * Register a callback to be called on every animation frame.\n */\n public register(callback: LoopCallback): void {\n if (this.callbacks.has(callback)) return;\n \n this.callbacks.add(callback);\n \n // Start loop if this is the first subscriber\n if (this.callbacks.size === 1) {\n this.start();\n }\n }\n\n /**\n * Unregister a callback.\n */\n public unregister(callback: LoopCallback): void {\n this.callbacks.delete(callback);\n\n // Stop loop if no subscribers left\n if (this.callbacks.size === 0) {\n this.stop();\n }\n }\n\n private start(): void {\n if (this.isActive) return;\n this.isActive = true;\n \n // Ensure we are in a browser environment\n if (typeof window !== 'undefined') {\n this.tick();\n }\n }\n\n private stop(): void {\n this.isActive = false;\n if (this.rafId !== null && typeof window !== 'undefined') {\n cancelAnimationFrame(this.rafId);\n this.rafId = null;\n }\n }\n\n private tick = (): void => {\n if (!this.isActive) return;\n\n // Execute all registered callbacks\n this.callbacks.forEach(cb => {\n try {\n cb();\n } catch (e) {\n // Silent catch to prevent loop crash\n }\n });\n\n this.rafId = requestAnimationFrame(this.tick);\n };\n}\n","/**\n * Global Constants for React Scroll Media\n */\n\n// Scroll Logic\nexport const SCROLL_THRESHOLD = 0.0001; // Minimum progress change to trigger update\nexport const DEFAULT_SCROLL_LENGTH = '300vh';\n\n// Memory Management\nexport const DEFAULT_LAZY_BUFFER = 10;\nexport const MAX_CACHE_SIZE = 50; // Fallback max size if not dynamic\n\n// Sequences\nexport const DEFAULT_PAD_LENGTH = 0; // Default padding for image numbering\n\n// Styles & Layout\nexport const DEFAULT_FALLBACK_COLOR = '#ccc';\n","import { ScrollLoopManager } from './loopManager';\nimport { SCROLL_THRESHOLD } from '../constants';\n\nexport type TimelineCallback = (progress: number) => void;\n\nexport class ScrollTimeline {\n private container: Element;\n private subscribers = new Set();\n private currentProgress = 0;\n \n // Caching for performance\n private cachedRect: DOMRect | null = null;\n private cachedScrollParent: Element | Window | null = null;\n private cachedScrollParentRect: DOMRect | null = null;\n private cachedViewportHeight = 0;\n private cachedOffsetTop = 0;\n private isLayoutDirty = true;\n private resizeObserver: ResizeObserver | null = null;\n\n public readonly id = typeof crypto !== 'undefined' && crypto.randomUUID ? crypto.randomUUID() : Math.random().toString(36).substring(2, 9);\n\n constructor(container: Element) {\n this.container = container;\n \n if (typeof window !== 'undefined') {\n // Invalidate cache on resize\n this.resizeObserver = new ResizeObserver(() => {\n this.isLayoutDirty = true;\n });\n this.resizeObserver.observe(this.container);\n if (document.body) {\n this.resizeObserver.observe(document.body);\n }\n \n // Also listen to global resize\n window.addEventListener('resize', this.onWindowResize);\n }\n }\n\n private onWindowResize = () => {\n this.isLayoutDirty = true;\n };\n\n /**\n * Subscribe to progress updates.\n * Returns an unsubscribe function.\n */\n subscribe(callback: TimelineCallback): () => void {\n this.subscribers.add(callback);\n \n // Immediately call with current progress for initialization\n try {\n callback(this.currentProgress);\n } catch (e) {\n // Silent\n }\n\n // Register with unique LoopManager if we have subscribers\n if (this.subscribers.size === 1) {\n ScrollLoopManager.getInstance().register(this.tick);\n }\n \n return () => {\n this.subscribers.delete(callback);\n if (this.subscribers.size === 0) {\n ScrollLoopManager.getInstance().unregister(this.tick);\n }\n };\n }\n\n unsubscribe(callback: TimelineCallback): void {\n this.subscribers.delete(callback);\n if (this.subscribers.size === 0) {\n ScrollLoopManager.getInstance().unregister(this.tick);\n }\n }\n\n /**\n * Start is now handled by LoopManager via subscriptions\n * Deprecated but kept for API stability if needed.\n */\n start(): void {\n // No-op, managed by subscriptions\n }\n\n stop(): void {\n ScrollLoopManager.getInstance().unregister(this.tick);\n }\n\n private tick = (): void => {\n // Calculate Progress\n const progress = this.calculateProgress();\n\n // Notify if changed significantly (using threshold constant)\n if (Math.abs(progress - this.currentProgress) > SCROLL_THRESHOLD) {\n this.currentProgress = progress;\n this.notify();\n }\n };\n\n private notify() {\n this.subscribers.forEach((cb) => {\n try {\n cb(this.currentProgress);\n } catch (e) {\n // Silent\n }\n });\n }\n\n private updateCache() {\n if (!this.isLayoutDirty && this.cachedRect) return;\n\n this.cachedRect = this.container.getBoundingClientRect();\n \n if (!this.cachedScrollParent) {\n this.cachedScrollParent = this.getScrollParent(this.container);\n }\n\n if (this.cachedScrollParent instanceof Element) {\n this.cachedScrollParentRect = this.cachedScrollParent.getBoundingClientRect();\n this.cachedViewportHeight = this.cachedScrollParentRect.height;\n this.cachedOffsetTop = this.cachedScrollParentRect.top;\n } else if (typeof window !== 'undefined') {\n this.cachedViewportHeight = window.innerHeight;\n this.cachedOffsetTop = 0;\n }\n\n this.isLayoutDirty = false;\n }\n\n private calculateProgress(): number {\n if (this.isLayoutDirty || !this.cachedRect) {\n this.updateCache();\n }\n\n const currentRect = this.container.getBoundingClientRect();\n const scrollDist = (this.cachedRect?.height || currentRect.height) - this.cachedViewportHeight;\n\n // Guard: Zero Height / Division by Zero\n if (scrollDist <= 0) return 1;\n\n const relativeTop = currentRect.top - this.cachedOffsetTop;\n const rawProgress = -relativeTop / scrollDist;\n \n const clamped = Math.min(Math.max(rawProgress, 0), 1);\n \n // Round to 6 decimals to prevent micro-drift\n return Math.round(clamped * 1000000) / 1000000;\n }\n\n private getScrollParent(node: Element): Element | Window {\n if (typeof window === 'undefined') return node; \n\n let current = node.parentElement;\n while (current) {\n const style = getComputedStyle(current);\n if (['auto', 'scroll'].includes(style.overflowY)) {\n return current;\n }\n current = current.parentElement;\n }\n return window;\n }\n\n destroy() {\n this.subscribers.clear();\n ScrollLoopManager.getInstance().unregister(this.tick);\n \n if (this.resizeObserver) {\n this.resizeObserver.disconnect();\n }\n if (typeof window !== 'undefined') {\n window.removeEventListener('resize', this.onWindowResize);\n }\n }\n}\n","import React, { useRef, useEffect } from 'react';\nimport { useScrollTimeline } from './useScrollTimeline';\n\nexport interface ScrollTextProps {\n children: React.ReactNode;\n /** Progress start (0-1) where ENTRANCE animation begins */\n start?: number;\n /** Progress end (0-1) where ENTRANCE animation ends */\n end?: number;\n \n /** Progress start (0-1) where EXIT animation begins. 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