{"version":3,"file":"index.cjs","sources":["../../src/index.ts"],"sourcesContent":["import { approxEqual, debounce, memo, notUndefined } from './utils'\n\nexport * from './utils'\n\n//\n\ntype ScrollDirection = 'forward' | 'backward'\n\ntype ScrollAlignment = 'start' | 'center' | 'end' | 'auto'\n\ntype ScrollBehavior = 'auto' | 'smooth' | 'instant'\n\nexport interface ScrollToOptions {\n align?: ScrollAlignment\n behavior?: ScrollBehavior\n}\n\ntype ScrollToOffsetOptions = ScrollToOptions\n\ntype ScrollToIndexOptions = ScrollToOptions\n\nexport interface Range {\n startIndex: number\n endIndex: number\n overscan: number\n count: number\n}\n\ntype Key = number | string | bigint\n\nexport interface VirtualItem {\n key: Key\n index: number\n start: number\n end: number\n size: number\n lane: number\n}\n\nexport interface Rect {\n width: number\n height: number\n}\n\n//\n\nconst getRect = (element: HTMLElement): Rect => {\n const { offsetWidth, offsetHeight } = element\n return { width: offsetWidth, height: offsetHeight }\n}\n\nexport const defaultKeyExtractor = (index: number) => index\n\nexport const defaultRangeExtractor = (range: Range) => {\n const start = Math.max(range.startIndex - range.overscan, 0)\n const end = Math.min(range.endIndex + range.overscan, range.count - 1)\n\n const arr = []\n\n for (let i = start; i <= end; i++) {\n arr.push(i)\n }\n\n return arr\n}\n\nexport const observeElementRect = (\n instance: Virtualizer,\n cb: (rect: Rect) => void,\n) => {\n const element = instance.scrollElement\n if (!element) {\n return\n }\n const targetWindow = instance.targetWindow\n if (!targetWindow) {\n return\n }\n\n const handler = (rect: Rect) => {\n const { width, height } = rect\n cb({ width: Math.round(width), height: Math.round(height) })\n }\n\n handler(getRect(element as unknown as HTMLElement))\n\n if (!targetWindow.ResizeObserver) {\n return () => {}\n }\n\n const observer = new targetWindow.ResizeObserver((entries) => {\n const run = () => {\n const entry = entries[0]\n if (entry?.borderBoxSize) {\n const box = entry.borderBoxSize[0]\n if (box) {\n handler({ width: box.inlineSize, height: box.blockSize })\n return\n }\n }\n handler(getRect(element as unknown as HTMLElement))\n }\n\n instance.options.useAnimationFrameWithResizeObserver\n ? requestAnimationFrame(run)\n : run()\n })\n\n observer.observe(element, { box: 'border-box' })\n\n return () => {\n observer.unobserve(element)\n }\n}\n\nconst addEventListenerOptions = {\n passive: true,\n}\n\nexport const observeWindowRect = (\n instance: Virtualizer,\n cb: (rect: Rect) => void,\n) => {\n const element = instance.scrollElement\n if (!element) {\n return\n }\n\n const handler = () => {\n cb({ width: element.innerWidth, height: element.innerHeight })\n }\n handler()\n\n element.addEventListener('resize', handler, addEventListenerOptions)\n\n return () => {\n element.removeEventListener('resize', handler)\n }\n}\n\nconst supportsScrollend =\n typeof window == 'undefined' ? true : 'onscrollend' in window\n\ntype ObserveOffsetCallBack = (offset: number, isScrolling: boolean) => void\n\nexport const observeElementOffset = (\n instance: Virtualizer,\n cb: ObserveOffsetCallBack,\n) => {\n const element = instance.scrollElement\n if (!element) {\n return\n }\n const targetWindow = instance.targetWindow\n if (!targetWindow) {\n return\n }\n\n let offset = 0\n const fallback =\n instance.options.useScrollendEvent && supportsScrollend\n ? () => undefined\n : debounce(\n targetWindow,\n () => {\n cb(offset, false)\n },\n instance.options.isScrollingResetDelay,\n )\n\n const createHandler = (isScrolling: boolean) => () => {\n const { horizontal, isRtl } = instance.options\n offset = horizontal\n ? element['scrollLeft'] * ((isRtl && -1) || 1)\n : element['scrollTop']\n fallback()\n cb(offset, isScrolling)\n }\n const handler = createHandler(true)\n const endHandler = createHandler(false)\n\n element.addEventListener('scroll', handler, addEventListenerOptions)\n const registerScrollendEvent =\n instance.options.useScrollendEvent && supportsScrollend\n if (registerScrollendEvent) {\n element.addEventListener('scrollend', endHandler, addEventListenerOptions)\n }\n return () => {\n element.removeEventListener('scroll', handler)\n if (registerScrollendEvent) {\n element.removeEventListener('scrollend', endHandler)\n }\n }\n}\n\nexport const observeWindowOffset = (\n instance: Virtualizer,\n cb: ObserveOffsetCallBack,\n) => {\n const element = instance.scrollElement\n if (!element) {\n return\n }\n const targetWindow = instance.targetWindow\n if (!targetWindow) {\n return\n }\n\n let offset = 0\n const fallback =\n instance.options.useScrollendEvent && supportsScrollend\n ? () => undefined\n : debounce(\n targetWindow,\n () => {\n cb(offset, false)\n },\n instance.options.isScrollingResetDelay,\n )\n\n const createHandler = (isScrolling: boolean) => () => {\n offset = element[instance.options.horizontal ? 'scrollX' : 'scrollY']\n fallback()\n cb(offset, isScrolling)\n }\n const handler = createHandler(true)\n const endHandler = createHandler(false)\n\n element.addEventListener('scroll', handler, addEventListenerOptions)\n const registerScrollendEvent =\n instance.options.useScrollendEvent && supportsScrollend\n if (registerScrollendEvent) {\n element.addEventListener('scrollend', endHandler, addEventListenerOptions)\n }\n return () => {\n element.removeEventListener('scroll', handler)\n if (registerScrollendEvent) {\n element.removeEventListener('scrollend', endHandler)\n }\n }\n}\n\nexport const measureElement = (\n element: TItemElement,\n entry: ResizeObserverEntry | undefined,\n instance: Virtualizer,\n) => {\n if (entry?.borderBoxSize) {\n const box = entry.borderBoxSize[0]\n if (box) {\n const size = Math.round(\n box[instance.options.horizontal ? 'inlineSize' : 'blockSize'],\n )\n return size\n }\n }\n\n return (element as unknown as HTMLElement)[\n instance.options.horizontal ? 'offsetWidth' : 'offsetHeight'\n ]\n}\n\nexport const windowScroll = (\n offset: number,\n {\n adjustments = 0,\n behavior,\n }: { adjustments?: number; behavior?: ScrollBehavior },\n instance: Virtualizer,\n) => {\n const toOffset = offset + adjustments\n\n instance.scrollElement?.scrollTo?.({\n [instance.options.horizontal ? 'left' : 'top']: toOffset,\n behavior,\n })\n}\n\nexport const elementScroll = (\n offset: number,\n {\n adjustments = 0,\n behavior,\n }: { adjustments?: number; behavior?: ScrollBehavior },\n instance: Virtualizer,\n) => {\n const toOffset = offset + adjustments\n\n instance.scrollElement?.scrollTo?.({\n [instance.options.horizontal ? 'left' : 'top']: toOffset,\n behavior,\n })\n}\n\ntype LaneAssignmentMode = 'estimate' | 'measured'\n\nexport interface VirtualizerOptions<\n TScrollElement extends Element | Window,\n TItemElement extends Element,\n> {\n // Required from the user\n count: number\n getScrollElement: () => TScrollElement | null\n estimateSize: (index: number) => number\n\n // Required from the framework adapter (but can be overridden)\n scrollToFn: (\n offset: number,\n options: { adjustments?: number; behavior?: ScrollBehavior },\n instance: Virtualizer,\n ) => void\n observeElementRect: (\n instance: Virtualizer,\n cb: (rect: Rect) => void,\n ) => void | (() => void)\n observeElementOffset: (\n instance: Virtualizer,\n cb: ObserveOffsetCallBack,\n ) => void | (() => void)\n // Optional\n debug?: boolean\n initialRect?: Rect\n onChange?: (\n instance: Virtualizer,\n sync: boolean,\n ) => void\n measureElement?: (\n element: TItemElement,\n entry: ResizeObserverEntry | undefined,\n instance: Virtualizer,\n ) => number\n overscan?: number\n horizontal?: boolean\n paddingStart?: number\n paddingEnd?: number\n scrollPaddingStart?: number\n scrollPaddingEnd?: number\n initialOffset?: number | (() => number)\n getItemKey?: (index: number) => Key\n rangeExtractor?: (range: Range) => Array\n scrollMargin?: number\n gap?: number\n indexAttribute?: string\n initialMeasurementsCache?: Array\n lanes?: number\n isScrollingResetDelay?: number\n useScrollendEvent?: boolean\n enabled?: boolean\n isRtl?: boolean\n useAnimationFrameWithResizeObserver?: boolean\n laneAssignmentMode?: LaneAssignmentMode\n}\n\ntype ScrollState = {\n // what we want\n index: number | null\n align: ScrollAlignment\n behavior: ScrollBehavior\n\n // lifecycle\n startedAt: number\n\n // target tracking\n lastTargetOffset: number\n\n // settling\n stableFrames: number\n}\n\nexport class Virtualizer<\n TScrollElement extends Element | Window,\n TItemElement extends Element,\n> {\n private unsubs: Array void)> = []\n options!: Required>\n scrollElement: TScrollElement | null = null\n targetWindow: (Window & typeof globalThis) | null = null\n isScrolling = false\n private scrollState: ScrollState | null = null\n measurementsCache: Array = []\n private itemSizeCache = new Map()\n private laneAssignments = new Map() // index → lane cache\n private pendingMeasuredCacheIndexes: Array = []\n private prevLanes: number | undefined = undefined\n private lanesChangedFlag = false\n private lanesSettling = false\n scrollRect: Rect | null = null\n scrollOffset: number | null = null\n scrollDirection: ScrollDirection | null = null\n private scrollAdjustments = 0\n shouldAdjustScrollPositionOnItemSizeChange:\n | undefined\n | ((\n item: VirtualItem,\n delta: number,\n instance: Virtualizer,\n ) => boolean)\n elementsCache = new Map()\n private now = () => this.targetWindow?.performance?.now?.() ?? Date.now()\n private observer = (() => {\n let _ro: ResizeObserver | null = null\n\n const get = () => {\n if (_ro) {\n return _ro\n }\n\n if (!this.targetWindow || !this.targetWindow.ResizeObserver) {\n return null\n }\n\n return (_ro = new this.targetWindow.ResizeObserver((entries) => {\n entries.forEach((entry) => {\n const run = () => {\n const node = entry.target as TItemElement\n const index = this.indexFromElement(node)\n\n if (!node.isConnected) {\n this.observer.unobserve(node)\n return\n }\n\n if (this.shouldMeasureDuringScroll(index)) {\n this.resizeItem(\n index,\n this.options.measureElement(node, entry, this),\n )\n }\n }\n this.options.useAnimationFrameWithResizeObserver\n ? requestAnimationFrame(run)\n : run()\n })\n }))\n }\n\n return {\n disconnect: () => {\n get()?.disconnect()\n _ro = null\n },\n observe: (target: Element) =>\n get()?.observe(target, { box: 'border-box' }),\n unobserve: (target: Element) => get()?.unobserve(target),\n }\n })()\n range: { startIndex: number; endIndex: number } | null = null\n\n constructor(opts: VirtualizerOptions) {\n this.setOptions(opts)\n }\n\n setOptions = (opts: VirtualizerOptions) => {\n Object.entries(opts).forEach(([key, value]) => {\n if (typeof value === 'undefined') delete (opts as any)[key]\n })\n\n this.options = {\n debug: false,\n initialOffset: 0,\n overscan: 1,\n paddingStart: 0,\n paddingEnd: 0,\n scrollPaddingStart: 0,\n scrollPaddingEnd: 0,\n horizontal: false,\n getItemKey: defaultKeyExtractor,\n rangeExtractor: defaultRangeExtractor,\n onChange: () => {},\n measureElement,\n initialRect: { width: 0, height: 0 },\n scrollMargin: 0,\n gap: 0,\n indexAttribute: 'data-index',\n initialMeasurementsCache: [],\n lanes: 1,\n isScrollingResetDelay: 150,\n enabled: true,\n isRtl: false,\n useScrollendEvent: false,\n useAnimationFrameWithResizeObserver: false,\n laneAssignmentMode: 'estimate',\n ...opts,\n }\n }\n\n private notify = (sync: boolean) => {\n this.options.onChange?.(this, sync)\n }\n\n private maybeNotify = memo(\n () => {\n this.calculateRange()\n\n return [\n this.isScrolling,\n this.range ? this.range.startIndex : null,\n this.range ? this.range.endIndex : null,\n ]\n },\n (isScrolling) => {\n this.notify(isScrolling)\n },\n {\n key: process.env.NODE_ENV !== 'production' && 'maybeNotify',\n debug: () => this.options.debug,\n initialDeps: [\n this.isScrolling,\n this.range ? this.range.startIndex : null,\n this.range ? this.range.endIndex : null,\n ] as [boolean, number | null, number | null],\n },\n )\n\n private cleanup = () => {\n this.unsubs.filter(Boolean).forEach((d) => d!())\n this.unsubs = []\n this.observer.disconnect()\n if (this.rafId != null && this.targetWindow) {\n this.targetWindow.cancelAnimationFrame(this.rafId)\n this.rafId = null\n }\n this.scrollState = null\n this.scrollElement = null\n this.targetWindow = null\n }\n\n _didMount = () => {\n return () => {\n this.cleanup()\n }\n }\n\n _willUpdate = () => {\n const scrollElement = this.options.enabled\n ? this.options.getScrollElement()\n : null\n\n if (this.scrollElement !== scrollElement) {\n this.cleanup()\n\n if (!scrollElement) {\n this.maybeNotify()\n return\n }\n\n this.scrollElement = scrollElement\n\n if (this.scrollElement && 'ownerDocument' in this.scrollElement) {\n this.targetWindow = this.scrollElement.ownerDocument.defaultView\n } else {\n this.targetWindow = this.scrollElement?.window ?? null\n }\n\n this.elementsCache.forEach((cached) => {\n this.observer.observe(cached)\n })\n\n this.unsubs.push(\n this.options.observeElementRect(this, (rect) => {\n this.scrollRect = rect\n this.maybeNotify()\n }),\n )\n\n this.unsubs.push(\n this.options.observeElementOffset(this, (offset, isScrolling) => {\n this.scrollAdjustments = 0\n this.scrollDirection = isScrolling\n ? this.getScrollOffset() < offset\n ? 'forward'\n : 'backward'\n : null\n this.scrollOffset = offset\n this.isScrolling = isScrolling\n\n if (this.scrollState) {\n this.scheduleScrollReconcile()\n }\n this.maybeNotify()\n }),\n )\n\n this._scrollToOffset(this.getScrollOffset(), {\n adjustments: undefined,\n behavior: undefined,\n })\n }\n }\n\n private rafId: number | null = null\n private scheduleScrollReconcile() {\n if (!this.targetWindow) {\n this.scrollState = null\n return\n }\n if (this.rafId != null) return\n this.rafId = this.targetWindow.requestAnimationFrame(() => {\n this.rafId = null\n this.reconcileScroll()\n })\n }\n private reconcileScroll() {\n if (!this.scrollState) return\n\n const el = this.scrollElement\n if (!el) return\n\n // Safety valve: bail out if reconciliation has been running too long\n const MAX_RECONCILE_MS = 5000\n if (this.now() - this.scrollState.startedAt > MAX_RECONCILE_MS) {\n this.scrollState = null\n return\n }\n\n const offsetInfo =\n this.scrollState.index != null\n ? this.getOffsetForIndex(this.scrollState.index, this.scrollState.align)\n : undefined\n const targetOffset = offsetInfo\n ? offsetInfo[0]\n : this.scrollState.lastTargetOffset\n\n // Require one stable frame where target matches scroll offset.\n // approxEqual() already tolerates minor fluctuations, so one frame is sufficient\n // to confirm scroll has reached its target without premature cleanup.\n const STABLE_FRAMES = 1\n\n const targetChanged = targetOffset !== this.scrollState.lastTargetOffset\n\n if (!targetChanged && approxEqual(targetOffset, this.getScrollOffset())) {\n this.scrollState.stableFrames++\n if (this.scrollState.stableFrames >= STABLE_FRAMES) {\n this.scrollState = null\n return\n }\n } else {\n this.scrollState.stableFrames = 0\n\n if (targetChanged) {\n this.scrollState.lastTargetOffset = targetOffset\n // Switch to 'auto' behavior once measurements cause target to change\n // We want to jump directly to the correct position, not smoothly animate to it\n this.scrollState.behavior = 'auto'\n\n this._scrollToOffset(targetOffset, {\n adjustments: undefined,\n behavior: 'auto',\n })\n }\n }\n\n // Always reschedule while scrollState is active to guarantee\n // the safety valve timeout runs even if no scroll events fire\n // (e.g. no-op scrollToFn, detached element)\n this.scheduleScrollReconcile()\n }\n\n private getSize = () => {\n if (!this.options.enabled) {\n this.scrollRect = null\n return 0\n }\n\n this.scrollRect = this.scrollRect ?? this.options.initialRect\n\n return this.scrollRect[this.options.horizontal ? 'width' : 'height']\n }\n\n private getScrollOffset = () => {\n if (!this.options.enabled) {\n this.scrollOffset = null\n return 0\n }\n\n this.scrollOffset =\n this.scrollOffset ??\n (typeof this.options.initialOffset === 'function'\n ? this.options.initialOffset()\n : this.options.initialOffset)\n\n return this.scrollOffset\n }\n\n private getFurthestMeasurement = (\n measurements: Array,\n index: number,\n ) => {\n const furthestMeasurementsFound = new Map()\n const furthestMeasurements = new Map()\n for (let m = index - 1; m >= 0; m--) {\n const measurement = measurements[m]!\n\n if (furthestMeasurementsFound.has(measurement.lane)) {\n continue\n }\n\n const previousFurthestMeasurement = furthestMeasurements.get(\n measurement.lane,\n )\n if (\n previousFurthestMeasurement == null ||\n measurement.end > previousFurthestMeasurement.end\n ) {\n furthestMeasurements.set(measurement.lane, measurement)\n } else if (measurement.end < previousFurthestMeasurement.end) {\n furthestMeasurementsFound.set(measurement.lane, true)\n }\n\n if (furthestMeasurementsFound.size === this.options.lanes) {\n break\n }\n }\n\n return furthestMeasurements.size === this.options.lanes\n ? Array.from(furthestMeasurements.values()).sort((a, b) => {\n if (a.end === b.end) {\n return a.index - b.index\n }\n\n return a.end - b.end\n })[0]\n : undefined\n }\n\n private getMeasurementOptions = memo(\n () => [\n this.options.count,\n this.options.paddingStart,\n this.options.scrollMargin,\n this.options.getItemKey,\n this.options.enabled,\n this.options.lanes,\n this.options.laneAssignmentMode,\n ],\n (\n count,\n paddingStart,\n scrollMargin,\n getItemKey,\n enabled,\n lanes,\n laneAssignmentMode,\n ) => {\n const lanesChanged =\n this.prevLanes !== undefined && this.prevLanes !== lanes\n\n if (lanesChanged) {\n // Set flag for getMeasurements to handle\n this.lanesChangedFlag = true\n }\n\n this.prevLanes = lanes\n this.pendingMeasuredCacheIndexes = []\n\n return {\n count,\n paddingStart,\n scrollMargin,\n getItemKey,\n enabled,\n lanes,\n laneAssignmentMode,\n }\n },\n {\n key: false,\n },\n )\n\n private getMeasurements = memo(\n () => [this.getMeasurementOptions(), this.itemSizeCache],\n (\n {\n count,\n paddingStart,\n scrollMargin,\n getItemKey,\n enabled,\n lanes,\n laneAssignmentMode,\n },\n itemSizeCache,\n ) => {\n if (!enabled) {\n this.measurementsCache = []\n this.itemSizeCache.clear()\n this.laneAssignments.clear()\n return []\n }\n\n // Clean up stale lane cache entries when count decreases\n if (this.laneAssignments.size > count) {\n for (const index of this.laneAssignments.keys()) {\n if (index >= count) {\n this.laneAssignments.delete(index)\n }\n }\n }\n\n // ✅ Force complete recalculation when lanes change\n if (this.lanesChangedFlag) {\n this.lanesChangedFlag = false // Reset immediately\n this.lanesSettling = true // Start settling period\n this.measurementsCache = []\n this.itemSizeCache.clear()\n this.laneAssignments.clear() // Clear lane cache for new lane count\n // Clear pending indexes to force min = 0\n this.pendingMeasuredCacheIndexes = []\n }\n\n // Don't restore from initialMeasurementsCache during lane changes\n // as it contains stale lane assignments from the previous lane count\n if (this.measurementsCache.length === 0 && !this.lanesSettling) {\n this.measurementsCache = this.options.initialMeasurementsCache\n this.measurementsCache.forEach((item) => {\n this.itemSizeCache.set(item.key, item.size)\n })\n }\n\n // ✅ During lanes settling, ignore pendingMeasuredCacheIndexes to prevent repositioning\n const min = this.lanesSettling\n ? 0\n : this.pendingMeasuredCacheIndexes.length > 0\n ? Math.min(...this.pendingMeasuredCacheIndexes)\n : 0\n this.pendingMeasuredCacheIndexes = []\n\n // ✅ End settling period when cache is fully built\n if (this.lanesSettling && this.measurementsCache.length === count) {\n this.lanesSettling = false\n }\n\n const measurements = this.measurementsCache.slice(0, min)\n\n // ✅ Performance: Track last item index per lane for O(1) lookup\n const laneLastIndex: Array = new Array(lanes).fill(\n undefined,\n )\n\n // Initialize from existing measurements (before min)\n for (let m = 0; m < min; m++) {\n const item = measurements[m]\n if (item) {\n laneLastIndex[item.lane] = m\n }\n }\n\n for (let i = min; i < count; i++) {\n const key = getItemKey(i)\n\n // Check for cached lane assignment\n const cachedLane = this.laneAssignments.get(i)\n let lane: number\n let start: number\n\n const shouldCacheLane =\n laneAssignmentMode === 'estimate' || itemSizeCache.has(key)\n\n if (cachedLane !== undefined && this.options.lanes > 1) {\n // Use cached lane - O(1) lookup for previous item in same lane\n lane = cachedLane\n const prevIndex = laneLastIndex[lane]\n const prevInLane =\n prevIndex !== undefined ? measurements[prevIndex] : undefined\n start = prevInLane\n ? prevInLane.end + this.options.gap\n : paddingStart + scrollMargin\n } else {\n // No cache - use original logic (find shortest lane)\n const furthestMeasurement =\n this.options.lanes === 1\n ? measurements[i - 1]\n : this.getFurthestMeasurement(measurements, i)\n\n start = furthestMeasurement\n ? furthestMeasurement.end + this.options.gap\n : paddingStart + scrollMargin\n\n lane = furthestMeasurement\n ? furthestMeasurement.lane\n : i % this.options.lanes\n\n if (this.options.lanes > 1 && shouldCacheLane) {\n this.laneAssignments.set(i, lane)\n }\n }\n\n const measuredSize = itemSizeCache.get(key)\n const size =\n typeof measuredSize === 'number'\n ? measuredSize\n : this.options.estimateSize(i)\n\n const end = start + size\n\n measurements[i] = {\n index: i,\n start,\n size,\n end,\n key,\n lane,\n }\n\n // ✅ Performance: Update lane's last item index\n laneLastIndex[lane] = i\n }\n\n this.measurementsCache = measurements\n\n return measurements\n },\n {\n key: process.env.NODE_ENV !== 'production' && 'getMeasurements',\n debug: () => this.options.debug,\n },\n )\n\n calculateRange = memo(\n () => [\n this.getMeasurements(),\n this.getSize(),\n this.getScrollOffset(),\n this.options.lanes,\n ],\n (measurements, outerSize, scrollOffset, lanes) => {\n return (this.range =\n measurements.length > 0 && outerSize > 0\n ? calculateRange({\n measurements,\n outerSize,\n scrollOffset,\n lanes,\n })\n : null)\n },\n {\n key: process.env.NODE_ENV !== 'production' && 'calculateRange',\n debug: () => this.options.debug,\n },\n )\n\n getVirtualIndexes = memo(\n () => {\n let startIndex: number | null = null\n let endIndex: number | null = null\n const range = this.calculateRange()\n if (range) {\n startIndex = range.startIndex\n endIndex = range.endIndex\n }\n this.maybeNotify.updateDeps([this.isScrolling, startIndex, endIndex])\n return [\n this.options.rangeExtractor,\n this.options.overscan,\n this.options.count,\n startIndex,\n endIndex,\n ]\n },\n (rangeExtractor, overscan, count, startIndex, endIndex) => {\n return startIndex === null || endIndex === null\n ? []\n : rangeExtractor({\n startIndex,\n endIndex,\n overscan,\n count,\n })\n },\n {\n key: process.env.NODE_ENV !== 'production' && 'getVirtualIndexes',\n debug: () => this.options.debug,\n },\n )\n\n indexFromElement = (node: TItemElement) => {\n const attributeName = this.options.indexAttribute\n const indexStr = node.getAttribute(attributeName)\n\n if (!indexStr) {\n console.warn(\n `Missing attribute name '${attributeName}={index}' on measured element.`,\n )\n return -1\n }\n\n return parseInt(indexStr, 10)\n }\n\n /**\n * Determines if an item at the given index should be measured during smooth scroll.\n * During smooth scroll, only items within a buffer range around the target are measured\n * to prevent items far from the target from pushing it away.\n */\n private shouldMeasureDuringScroll = (index: number): boolean => {\n // No scroll state or not smooth scroll - always allow measurements\n if (!this.scrollState || this.scrollState.behavior !== 'smooth') {\n return true\n }\n\n const scrollIndex =\n this.scrollState.index ??\n this.getVirtualItemForOffset(this.scrollState.lastTargetOffset)?.index\n\n if (scrollIndex !== undefined && this.range) {\n // Allow measurements within a buffer range around the scroll target\n const bufferSize = Math.max(\n this.options.overscan,\n Math.ceil((this.range.endIndex - this.range.startIndex) / 2),\n )\n const minIndex = Math.max(0, scrollIndex - bufferSize)\n const maxIndex = Math.min(\n this.options.count - 1,\n scrollIndex + bufferSize,\n )\n return index >= minIndex && index <= maxIndex\n }\n\n return true\n }\n\n measureElement = (node: TItemElement | null) => {\n if (!node) {\n this.elementsCache.forEach((cached, key) => {\n if (!cached.isConnected) {\n this.observer.unobserve(cached)\n this.elementsCache.delete(key)\n }\n })\n return\n }\n\n const index = this.indexFromElement(node)\n const key = this.options.getItemKey(index)\n const prevNode = this.elementsCache.get(key)\n\n if (prevNode !== node) {\n if (prevNode) {\n this.observer.unobserve(prevNode)\n }\n this.observer.observe(node)\n this.elementsCache.set(key, node)\n }\n\n // Sync-measure when idle (initial render) or during programmatic scrolling\n // (scrollToIndex/scrollToOffset) where reconcileScroll needs sizes in the same frame.\n // During normal user scrolling, skip sync measurement — the RO callback handles it async.\n if (\n (!this.isScrolling || this.scrollState) &&\n this.shouldMeasureDuringScroll(index)\n ) {\n this.resizeItem(index, this.options.measureElement(node, undefined, this))\n }\n }\n\n resizeItem = (index: number, size: number) => {\n const item = this.measurementsCache[index]\n if (!item) return\n\n const itemSize = this.itemSizeCache.get(item.key) ?? item.size\n const delta = size - itemSize\n\n if (delta !== 0) {\n if (\n this.scrollState?.behavior !== 'smooth' &&\n (this.shouldAdjustScrollPositionOnItemSizeChange !== undefined\n ? this.shouldAdjustScrollPositionOnItemSizeChange(item, delta, this)\n : item.start < this.getScrollOffset() + this.scrollAdjustments)\n ) {\n if (process.env.NODE_ENV !== 'production' && this.options.debug) {\n console.info('correction', delta)\n }\n this._scrollToOffset(this.getScrollOffset(), {\n adjustments: (this.scrollAdjustments += delta),\n behavior: undefined,\n })\n }\n\n this.pendingMeasuredCacheIndexes.push(item.index)\n this.itemSizeCache = new Map(this.itemSizeCache.set(item.key, size))\n\n this.notify(false)\n }\n }\n\n getVirtualItems = memo(\n () => [this.getVirtualIndexes(), this.getMeasurements()],\n (indexes, measurements) => {\n const virtualItems: Array = []\n\n for (let k = 0, len = indexes.length; k < len; k++) {\n const i = indexes[k]!\n const measurement = measurements[i]!\n\n virtualItems.push(measurement)\n }\n\n return virtualItems\n },\n {\n key: process.env.NODE_ENV !== 'production' && 'getVirtualItems',\n debug: () => this.options.debug,\n },\n )\n\n getVirtualItemForOffset = (offset: number) => {\n const measurements = this.getMeasurements()\n if (measurements.length === 0) {\n return undefined\n }\n return notUndefined(\n measurements[\n findNearestBinarySearch(\n 0,\n measurements.length - 1,\n (index: number) => notUndefined(measurements[index]).start,\n offset,\n )\n ],\n )\n }\n\n private getMaxScrollOffset = () => {\n if (!this.scrollElement) return 0\n\n if ('scrollHeight' in this.scrollElement) {\n // Element\n return this.options.horizontal\n ? 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'end' : 'start'\n }\n\n if (align === 'center') {\n // When aligning to a particular item (e.g. with scrollToIndex),\n // adjust offset by the size of the item to center on the item\n toOffset += (itemSize - size) / 2\n } else if (align === 'end') {\n toOffset -= size\n }\n\n const maxOffset = this.getMaxScrollOffset()\n\n return Math.max(Math.min(maxOffset, toOffset), 0)\n }\n\n getOffsetForIndex = (index: number, align: ScrollAlignment = 'auto') => {\n index = Math.max(0, Math.min(index, this.options.count - 1))\n\n const size = this.getSize()\n const scrollOffset = this.getScrollOffset()\n\n const item = this.measurementsCache[index]\n if (!item) return\n\n if (align === 'auto') {\n if (item.end >= scrollOffset + size - this.options.scrollPaddingEnd) {\n align = 'end'\n } else if (item.start <= scrollOffset + this.options.scrollPaddingStart) {\n align = 'start'\n } else {\n return [scrollOffset, align] as const\n }\n }\n\n // For the last item with 'end' alignment, use browser's actual max scroll\n // to account for borders/padding that aren't in our measurements\n if (align === 'end' && index === this.options.count - 1) {\n return [this.getMaxScrollOffset(), align] as const\n }\n\n const toOffset =\n align === 'end'\n ? item.end + this.options.scrollPaddingEnd\n : item.start - this.options.scrollPaddingStart\n\n return [\n this.getOffsetForAlignment(toOffset, align, item.size),\n align,\n ] as const\n }\n\n scrollToOffset = (\n toOffset: number,\n { align = 'start', behavior = 'auto' }: ScrollToOffsetOptions = {},\n ) => {\n const offset = this.getOffsetForAlignment(toOffset, align)\n\n const now = this.now()\n this.scrollState = {\n index: null,\n align,\n behavior,\n startedAt: now,\n lastTargetOffset: offset,\n stableFrames: 0,\n }\n\n this._scrollToOffset(offset, { adjustments: undefined, behavior })\n\n this.scheduleScrollReconcile()\n }\n\n scrollToIndex = (\n index: number,\n {\n align: initialAlign = 'auto',\n behavior = 'auto',\n }: 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number\n // If there are no measurements, set the end to paddingStart\n // If there is only one lane, use the last measurement's end\n // Otherwise find the maximum end value among all measurements\n if (measurements.length === 0) {\n end = this.options.paddingStart\n } else if (this.options.lanes === 1) {\n end = measurements[measurements.length - 1]?.end ?? 0\n } else {\n const endByLane = Array(this.options.lanes).fill(null)\n let endIndex = measurements.length - 1\n while (endIndex >= 0 && endByLane.some((val) => val === null)) {\n const item = measurements[endIndex]!\n if (endByLane[item.lane] === null) {\n endByLane[item.lane] = item.end\n }\n\n endIndex--\n }\n\n end = Math.max(...endByLane.filter((val): val is number => val !== null))\n }\n\n return Math.max(\n end - this.options.scrollMargin + this.options.paddingEnd,\n 0,\n )\n }\n\n private _scrollToOffset = (\n offset: number,\n {\n adjustments,\n behavior,\n }: {\n adjustments: number | undefined\n behavior: ScrollBehavior 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