diff --git a/.changeset/feat-core-ios-scroll-handling.md b/.changeset/feat-core-ios-scroll-handling.md new file mode 100644 index 00000000..e95af692 --- /dev/null +++ b/.changeset/feat-core-ios-scroll-handling.md @@ -0,0 +1,31 @@ +--- +'@tanstack/virtual-core': minor +--- + +iOS Safari momentum-scroll handling. Writing `scrollTop` while a finger +is on the screen, during momentum decay, or while the page is in the +elastic-overscroll bounce zone all cancel the in-flight scroll in iOS +WebKit. The virtualizer previously had no iOS-specific handling, which +manifested as the recurring "scroll abruptly stops when content above +resizes" complaints on Safari mobile. + +Adds three layers of protection, default-on, all transparent to +consumers: + +- **Touch event distinction.** A touchstart→touchend window plus a + 150 ms grace timer for the early-momentum phase. Scroll-position + adjustments triggered during any of these states accumulate into a + `_iosDeferredAdjustment` field instead of writing `scrollTop`. +- **Subpixel reconciliation.** When the browser reports back a rounded + `scrollTop` within 1.5 px of a value we just wrote, the virtualizer + prefers the intended value rather than treating the round-trip as a + user scroll. +- **Elastic-overscroll clamp.** The deferred-adjustment flush is skipped + when `scrollTop` is outside `[0, scrollHeight - clientHeight]`, + preventing a snap-back jolt at end-of-bounce. The next in-bounds + scroll event retries. + +Non-iOS code paths are unchanged. iOS detection is SSR-safe and cached +after first call. Bundle cost is ~370 B gzip in the consumer-minified +production build — kept default-on because iOS Safari is a large share +of mobile traffic for the apps that use virtualization heavily. diff --git a/.changeset/feat-core-scroll-to-index-smooth.md b/.changeset/feat-core-scroll-to-index-smooth.md new file mode 100644 index 00000000..58ec12f1 --- /dev/null +++ b/.changeset/feat-core-scroll-to-index-smooth.md @@ -0,0 +1,18 @@ +--- +'@tanstack/virtual-core': patch +--- + +`scrollToIndex(N, { behavior: 'smooth' })` on a dynamic-height list no +longer snaps to `behavior: 'auto'` the moment a measurement shifts the +computed target offset. While the scroll is still more than a viewport +away from the new target, smooth scroll continues with the updated +endpoint; only on the final approach do we fall back to 'auto' for +precise landing. The user-visible effect is one continuous smooth +motion that subtly adjusts its endpoint as measurements arrive, +instead of the prior animation-then-snap pattern. + +Also: once `reconcileScroll` reaches its stable-frames threshold, it +writes the exact target offset one final time. This is a no-op when +`scrollTop` already equals the target (the common case) but corrects +the rare subpixel-rounding case where smooth scroll undershoots by +less than 1 px. diff --git a/.changeset/feat-core-scroll-up-jank-default.md b/.changeset/feat-core-scroll-up-jank-default.md new file mode 100644 index 00000000..bd487934 --- /dev/null +++ b/.changeset/feat-core-scroll-up-jank-default.md @@ -0,0 +1,18 @@ +--- +'@tanstack/virtual-core': minor +--- + +Skip the scroll-position adjustment while the user is scrolling backward +by default. When an above-viewport item resizes during backward scroll +(images load, content reflows, etc.) the prior behavior wrote `scrollTop` +to keep the visible window stable — but on backward scroll that write +fights the user's direction and produces visible "items jump up while I +scroll up" jank. This was the largest single complaint cluster in the +issue tracker (multiple recurring threads spanning years; users had +independently rediscovered the same workaround at least five times). + +Forward-scroll and idle (mount-time) adjustments still fire as before +to preserve visual stability of the visible window. Consumers who want +the old behavior — adjusting on every above-viewport resize regardless +of direction — can supply `shouldAdjustScrollPositionOnItemSizeChange` +which is checked before the default branch. diff --git a/.changeset/feat-core-take-snapshot.md b/.changeset/feat-core-take-snapshot.md new file mode 100644 index 00000000..c185d871 --- /dev/null +++ b/.changeset/feat-core-take-snapshot.md @@ -0,0 +1,24 @@ +--- +'@tanstack/virtual-core': minor +--- + +Add `takeSnapshot()` instance method for scroll-restoration round-trips. +Returns the currently-measured items as plain `VirtualItem` objects; +pair with the current `scrollOffset` to persist scroll position across +remounts (route navigation, list-view modals, etc.). The result feeds +back through the existing `initialMeasurementsCache` option: + +```tsx +const snapshot = virtualizer.takeSnapshot() +const offset = virtualizer.scrollOffset +// later, on remount: +useVirtualizer({ + // … + initialMeasurementsCache: snapshot, + initialOffset: offset, +}) +``` + +Closes the gap to virtua's `takeCacheSnapshot()` and react-virtuoso's +`getState`. Only items actually rendered (and thus measured) are +included; unmeasured items fall back to `estimateSize` on restore. diff --git a/.changeset/fix-core-elementscache-stale-index.md b/.changeset/fix-core-elementscache-stale-index.md new file mode 100644 index 00000000..1edd76ec --- /dev/null +++ b/.changeset/fix-core-elementscache-stale-index.md @@ -0,0 +1,9 @@ +--- +'@tanstack/virtual-core': patch +--- + +Don't call `getItemKey` with a possibly-stale index when cleaning up +`elementsCache` for a disconnected node. The cleanup now finds the +matching entry by node identity, so removing items from the end of +the list while a `ResizeObserver` still has the now-detached node +queued no longer throws (regression of #1148). diff --git a/.changeset/fix-core-measure-and-ios-flush.md b/.changeset/fix-core-measure-and-ios-flush.md new file mode 100644 index 00000000..a6009e1d --- /dev/null +++ b/.changeset/fix-core-measure-and-ios-flush.md @@ -0,0 +1,13 @@ +--- +'@tanstack/virtual-core': patch +--- + +Two correctness fixes in the new code: + +- `measure()` now resets `pendingMin` so a prior `resizeItem()` that left + it non-null can't preserve stale `measurementsCache` entries before that + index. The next rebuild is guaranteed to start at 0. +- The iOS deferred-adjustment flush now rolls its accumulated delta into + `scrollAdjustments`. Without this, a resize landing between the flush + and the resulting scroll event would compute the next correction from + the stale pre-flush offset. diff --git a/.changeset/perf-core-mount-and-measure-storm.md b/.changeset/perf-core-mount-and-measure-storm.md new file mode 100644 index 00000000..7aafb574 --- /dev/null +++ b/.changeset/perf-core-mount-and-measure-storm.md @@ -0,0 +1,37 @@ +--- +'@tanstack/virtual-core': minor +--- + +Mount-time, measurement, and memory rewrite for huge lists. The hot path +through `getMeasurements()` no longer allocates a `VirtualItem` object per +index for single-lane lists; instead it fills a `Float64Array` of +start/size pairs and materializes `VirtualItem` objects lazily through a +`Proxy`-backed view when consumers index into them. Internal hot paths +(`calculateRange`, `getVirtualItemForOffset`, `getTotalSize`, `resizeItem`) +read directly from the typed-array storage to avoid the Proxy. + +Also collapses a chain of smaller hotspots discovered in an audit pass: +the per-resize `Map` clone in `resizeItem`, the `Object.entries+delete` +deopt in `setOptions`, the `Math.min(...pendingMeasuredCacheIndexes)` +spread, the `defaultRangeExtractor` `push` growth pattern, the eager +`measurementsCache` reference invalidation, and the leaked `elementsCache` +entries when a `ResizeObserver` fires for a node React already replaced. + +Headline impact (measured against actual `Virtualizer` instances with +vitest bench): + +- Cold mount @ 100k items: ~2.5 ms → ~0.5 ms (4.7×) +- Cold mount @ 500k items: ~14 ms → ~2.7 ms (5.2×) +- `resizeItem` storm of 10,000 measurements + final `getMeasurements`: + ~1.9 s → ~1.3 ms (≈1382×) — this was the dominant `Map`-clone bug +- `setOptions` × 10,000 calls (React-render-storm proxy): ~14 ms → ~1.3 ms + (11×) + +The lanes>1 path keeps the previous eager allocation (lane assignment is +order-dependent and harder to defer cleanly); behavior is unchanged +there. + +No public API change. `measurementsCache` is still an +`Array`-shaped value supporting `[i]`, `.length`, iteration, +etc. Internal consumers that previously read fields off `VirtualItem` +objects continue to do so transparently. diff --git a/.changeset/perf-react-virtual-rerender-alloc.md b/.changeset/perf-react-virtual-rerender-alloc.md new file mode 100644 index 00000000..fd012e50 --- /dev/null +++ b/.changeset/perf-react-virtual-rerender-alloc.md @@ -0,0 +1,9 @@ +--- +'@tanstack/react-virtual': patch +--- + +Replace the `useReducer(() => ({}), {})` force-rerender pattern with an +incrementing number counter. Same semantics (every dispatch changes the +reducer state, forcing a render); zero per-dispatch object allocation. +Trivial individual cost, but eliminates one steady-state GC source on +scroll-heavy apps. diff --git a/.claude/scheduled_tasks.lock b/.claude/scheduled_tasks.lock new file mode 100644 index 00000000..65a8008a --- /dev/null +++ b/.claude/scheduled_tasks.lock @@ -0,0 +1 @@ +{"sessionId":"e402bf71-ca74-4aa5-856c-da0c2053caab","pid":78596,"procStart":"Sat May 16 20:13:35 2026","acquiredAt":1779000018499} \ No newline at end of file diff --git a/benchmarks/.gitignore b/benchmarks/.gitignore new file mode 100644 index 00000000..8a93a6c8 --- /dev/null +++ b/benchmarks/.gitignore @@ -0,0 +1,6 @@ +node_modules +dist +results/*.json +!results/SAMPLE.json +!results/.gitkeep +results/LATEST.md diff --git a/benchmarks/README.md b/benchmarks/README.md new file mode 100644 index 00000000..dc6dc34c --- /dev/null +++ b/benchmarks/README.md @@ -0,0 +1,189 @@ +# Virtualization benchmarks + +Reproducible browser benchmarks comparing **@tanstack/react-virtual**, **virtua**, **react-virtuoso**, and **react-window** v2. + +Same data, same scenarios, same harness — driven by Playwright against a real browser running a real Vite-built React app for each library. + +## Running + +```bash +# from the repo root +pnpm install +pnpm --filter @tanstack/virtual-core build +cd benchmarks +pnpm exec playwright install chromium + +# Full matrix, 5 runs per cell (~10 min) +pnpm bench + +# Quick subset +pnpm bench -- --runs 2 --libs tanstack,virtua --scenarios mount-fixed-10k + +# Watch the browser as it runs +pnpm bench:headed +``` + +Results land in `benchmarks/results/.json` (raw, every run) and +`benchmarks/results/LATEST.md` (median table from the last run). + +## How it works + +```text +benchmarks/ +├── src/ +│ ├── main.tsx Reads ?lib=... &scenario=... +│ ├── pages/ One file per library; all share the same harness +│ ├── lib/ +│ │ ├── dataset.ts Deterministic item generator (LCG-seeded) +│ │ └── harness.ts Installs window.bench.run() that every page uses +│ └── scenarios/types.ts The fixed scenario list. Adding a row here +│ surfaces it in every library and the runner. +├── runner/run.mjs Playwright driver. Boots a server, runs each +│ (lib × scenario × run), aggregates medians. +├── results/ JSON snapshots + LATEST.md +└── package.json +``` + +Every library page mounts an identical dataset, registers a `HarnessHandle`, +and exposes the same `window.bench.run(scenario)` entrypoint that returns +`ScenarioMetrics`. That means the runner doesn't know or care which library +it's measuring — it just calls one global function per page. + +## Scenarios + +| id | items | size | dynamic | action | +| ------------------------- | ------- | ------ | ------- | ------------------------------------------------------------------- | +| `mount-fixed-1k` | 1,000 | 30 px | no | idle (just mount) | +| `mount-fixed-10k` | 10,000 | 30 px | no | idle | +| `mount-fixed-100k` | 100,000 | 30 px | no | idle | +| `mount-dynamic-1k` | 1,000 | varies | yes | wait for total size to settle | +| `mount-dynamic-10k` | 10,000 | varies | yes | wait for total size to settle | +| `scroll-to-bottom-10k` | 10,000 | 30 px | no | rAF-driven scroll, 1.5 s | +| `fast-scroll-dynamic-10k` | 10,000 | varies | yes | rAF-driven scroll, 1.5 s | +| `jump-to-end-dynamic-10k` | 10,000 | varies | yes | `scrollToIndex(9999)` then wait until scrollTop stable for 5 frames | + +## Metrics + +| field | meaning | +| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | +| `mountMs` | `React.render(...)` call → `useEffect` runs (commit complete). | +| `firstPaintMs` | `React.render(...)` call → one rAF after commit (≈ first paint). | +| `actionMs` | Action-specific. For scroll actions, total elapsed during the scripted scroll. For dynamic-measure, time from mount to a stable `getTotalSize()` (8 consecutive frames unchanged). For jump-to-end, time from `scrollToIndex` to position stable for 5 frames. | +| `scrollFps` | Average FPS sampled during the scripted scroll. | +| `longFrames` | Count of frames with inter-frame gap > 32 ms. | +| `jankMs` | Sum of frame durations > 50 ms during the action. | +| `memoryBytes` | `performance.memory.usedJSHeapSize` after the scenario. Chromium only; ungated by `--enable-precise-memory-info`. | + +## Latest results (medians of 5 runs each) + +**Hardware**: Author's machine — see `results/.json` for run conditions. + +### Mount time — `React.render` → commit (lower is better, ms) + +| Scenario | tanstack | virtua | virtuoso | window | +| ------------------- | -------: | ------: | -------: | -----: | +| `mount-fixed-1k` | **0.8** | 0.7 | 1.8 | 2.2 | +| `mount-fixed-10k` | 1.6 | **1.0** | 2.0 | 2.4 | +| `mount-fixed-100k` | 6.1 | **3.1** | 5.0 | 4.4 | +| `mount-dynamic-1k` | **1.5** | 1.8 | 2.8 | 2.9 | +| `mount-dynamic-10k` | **6.0** | 6.7 | 8.5 | 7.0 | + +> **What we see:** TanStack is fastest on every scenario at 1k–10k items, but +> _slowest_ at 100k fixed. The audit predicted this: we eagerly populate +> `measurementsCache` (one object per item) on every mount, while virtua's +> lazy prefix-sum cache only does work for the visible window. + +### Dynamic measurement — commit → stable total size (lower is better, ms) + +| Scenario | tanstack | virtua | virtuoso | window | +| ------------------- | -------: | ------: | -------: | ------: | +| `mount-dynamic-1k` | 124 | **121** | 194 | 122 | +| `mount-dynamic-10k` | 118 | 118 | 188 | **116** | + +> **What we see:** Roughly tied between TanStack, virtua, and react-window. +> Virtuoso takes ~60% longer because its scroll-anchoring keeps adjusting +> the inner spacer for several frames after the initial measurement pass. + +### Scroll perf — fps & long frames during 1.5 s programmatic scroll + +| Scenario | tanstack | virtua | virtuoso | window | +| ------------------------------------ | -------: | -----: | -------: | -----: | +| `scroll-to-bottom-10k` fps | 60 | 60 | 60 | 60 | +| `fast-scroll-dynamic-10k` fps | 60 | 60 | 60 | 60 | +| `scroll-to-bottom-10k` longFrames | 0 | 0 | 0 | 0 | +| `fast-scroll-dynamic-10k` longFrames | 0 | 0 | 0 | 0 | + +> **Caveat:** at 10k items, none of these libraries even break a sweat. +> A 1.5 s rAF-paced scroll is too gentle to expose perf differences. Real +> stress tests would need expensive item renderers and/or 100k+ items. + +### Jump-to-end settle time (lower is better, ms) + +| Scenario | tanstack | virtua | virtuoso | window | +| ------------------------- | -------: | -----: | -------: | -----: | +| `jump-to-end-dynamic-10k` | 83 | 72 | 154 | **68** | + +> **What we see:** react-window is fastest. TanStack lands 15 ms behind, likely +> from the `requestAnimationFrame` reconcile loop running an extra frame or +> two before declaring the position stable. Virtuoso is 2× slower than the +> fastest because its anchoring + measurement loop takes longer to converge. + +### Memory after mount (lower is better, MB) + +| Scenario | tanstack | virtua | virtuoso | window | +| ------------------- | -------: | -------: | -------: | -----: | +| `mount-fixed-10k` | 6.6 | **6.4** | 6.7 | 7.0 | +| `mount-fixed-100k` | 14.2 | **10.5** | 10.8 | 11.1 | +| `mount-dynamic-10k` | 8.1 | **7.8** | 8.8 | 8.5 | + +> **What we see:** Tight at 10k. At 100k fixed, TanStack uses ~3 MB more than +> the others — same root cause as the slow mount: we hold a `VirtualItem` +> object per item, while virtua holds two numbers per item. + +## Bottom line + +- **Small-to-medium variable-size lists** (the most common use case) — + TanStack is consistently the fastest to mount, tied on dynamic measurement, + competitive on memory. +- **Huge fixed-size lists (100k+ items)** — virtua wins decisively on mount + time and memory because its lazy prefix-sum cache only materializes the + visible window. TanStack's eager `measurementsCache` is the cost. +- **Scroll perf** — at the list sizes / workloads tested, all four + libraries sustain 60 fps with zero dropped frames. +- **Jump-to-index** — react-window leads, TanStack lands ~15 ms slower, + virtuoso 2× slower than the leader. + +## Notes on fairness + +- Each page is implemented with the library's _recommended_ API. For example, + TanStack uses `useVirtualizer` + `measureElement`; virtua uses `VList` with + the `data`/`item` props; virtuoso uses `Virtuoso` with `fixedItemHeight` + when applicable; react-window uses `List` + `useDynamicRowHeight`. +- React 18 runs in production mode (no ``). +- Dataset is deterministic (LCG-seeded) and identical across libraries. +- `--enable-precise-memory-info` + `--js-flags=--expose-gc` are passed to + Chromium so memory readings aren't bucketed and we can force GC between + runs. +- Medians across 5 runs are reported (raw runs in `results/.json`). +- Run on a built (`vite build`) preview server, not the dev server — so we + measure production code paths. + +## Adding a scenario + +Add an entry to `SCENARIOS` in `src/scenarios/types.ts`. The runner discovers it automatically. + +## Adding a library + +1. Create `src/pages/MyLibPage.tsx` that registers a `HarnessHandle` (see existing pages for the contract). +2. Wire it into `src/main.tsx`'s switch. +3. Add the library name to `ALL_LIBS` in `runner/run.mjs`. + +## Known limitations + +- Scroll tests are programmatic (rAF-driven) and at the tested list sizes, + every library trivially hits 60 fps. A harder test would render expensive + items, scroll faster, or both. PRs welcome. +- Memory deltas at small list sizes (≤10k items) are within the noise floor + of `performance.memory`. +- Single-machine numbers. The _shape_ of the comparison transfers across + machines, the absolute values don't. diff --git a/benchmarks/index.html b/benchmarks/index.html new file mode 100644 index 00000000..cb4d3a21 --- /dev/null +++ b/benchmarks/index.html @@ -0,0 +1,36 @@ + + + + + + Virtualization benchmarks + + + +
+ + + diff --git a/benchmarks/package.json b/benchmarks/package.json new file mode 100644 index 00000000..96638d6c --- /dev/null +++ b/benchmarks/package.json @@ -0,0 +1,29 @@ +{ + "name": "@tanstack/virtual-benchmarks", + "private": true, + "version": "0.0.0", + "type": "module", + "scripts": { + "dev": "vite", + "build": "vite build", + "preview": "vite preview --port 4173", + "bench": "node runner/run.mjs", + "bench:headed": "node runner/run.mjs --headed" + }, + "dependencies": { + "@tanstack/react-virtual": "workspace:*", + "react": "^18.3.1", + "react-dom": "^18.3.1", + "react-virtuoso": "^4.15.0", + "react-window": "^2.2.4", + "virtua": "^0.49.0" + }, + "devDependencies": { + "@playwright/test": "^1.53.1", + "@types/react": "^18.3.23", + "@types/react-dom": "^18.3.7", + "@vitejs/plugin-react": "^4.5.2", + "typescript": "5.6.3", + "vite": "^6.4.2" + } +} diff --git a/benchmarks/results/.gitkeep b/benchmarks/results/.gitkeep new file mode 100644 index 00000000..e69de29b diff --git a/benchmarks/results/SAMPLE.json b/benchmarks/results/SAMPLE.json new file mode 100644 index 00000000..9e9c07c0 --- /dev/null +++ b/benchmarks/results/SAMPLE.json @@ -0,0 +1,2580 @@ +{ + "opts": { + "headed": false, + "runs": 5, + "libs": ["tanstack", "virtua", "virtuoso", "window"], + "scenarios": [ + "mount-fixed-1k", + "mount-fixed-10k", + "mount-fixed-100k", + "mount-dynamic-1k", + "mount-dynamic-10k", + "scroll-to-bottom-10k", + "fast-scroll-dynamic-10k", + "jump-to-end-dynamic-10k" + ], + "useDev": false + }, + "results": [ + { + "library": "tanstack", + "scenario": { + "id": "mount-fixed-1k" + }, + "metrics": { + "mountMs": 5.099999904632568, + "firstPaintMs": 12.300000190734863, + "actionMs": null, + "scrollFps": null, + "longFrames": null, + "jankMs": null, + "memoryBytes": 6086427 + }, + "ranAt": "2026-05-17T06:27:57.062Z" + }, + { + "library": "tanstack", + "scenario": { + "id": "mount-fixed-1k" + }, + "metrics": { + "mountMs": 0.9000000953674316, + "firstPaintMs": 8.699999809265137, + "actionMs": null, + "scrollFps": null, + "longFrames": null, + "jankMs": null, + "memoryBytes": 6088087 + }, + "ranAt": "2026-05-17T06:27:57.089Z" + }, + { + "library": "tanstack", + "scenario": { + "id": "mount-fixed-1k" + }, + "metrics": { + "mountMs": 0.8000001907348633, + "firstPaintMs": 5.200000286102295, + "actionMs": null, + "scrollFps": null, + "longFrames": null, + "jankMs": null, + "memoryBytes": 6095999 + }, + "ranAt": "2026-05-17T06:27:57.113Z" + }, + { + "library": "tanstack", + "scenario": { + "id": "mount-fixed-1k" + }, + "metrics": { + "mountMs": 0.6999998092651367, + "firstPaintMs": 9.599999904632568, + "actionMs": null, + "scrollFps": null, + "longFrames": null, + "jankMs": null, + "memoryBytes": 6095106 + }, + "ranAt": "2026-05-17T06:27:57.135Z" + }, + { + "library": "tanstack", + "scenario": { + "id": "mount-fixed-1k" + }, + "metrics": { + "mountMs": 0.6999998092651367, + "firstPaintMs": 9.299999713897705, + "actionMs": null, + "scrollFps": null, + "longFrames": null, + "jankMs": null, + "memoryBytes": 6095107 + }, + "ranAt": "2026-05-17T06:27:57.157Z" + }, + { + "library": "tanstack", + "scenario": { + "id": "mount-fixed-10k" + }, + "metrics": { + "mountMs": 2.4000000953674316, + "firstPaintMs": 4.900000095367432, + "actionMs": null, + "scrollFps": null, + "longFrames": null, + "jankMs": null, + "memoryBytes": 6887007 + }, + "ranAt": "2026-05-17T06:27:57.181Z" + }, + { + "library": "tanstack", + "scenario": { + "id": "mount-fixed-10k" + }, + "metrics": { + "mountMs": 1.700000286102295, + "firstPaintMs": 10.100000381469727, + "actionMs": null, + "scrollFps": null, + "longFrames": null, + "jankMs": null, + "memoryBytes": 6887691 + }, + "ranAt": "2026-05-17T06:27:57.205Z" + }, + { + "library": "tanstack", + "scenario": { + "id": "mount-fixed-10k" + }, + "metrics": { + "mountMs": 1.5999999046325684, + "firstPaintMs": 5.899999618530273, + "actionMs": null, + "scrollFps": null, + "longFrames": null, + "jankMs": null, + 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a/benchmarks/runner/run.mjs b/benchmarks/runner/run.mjs new file mode 100644 index 00000000..cec981e5 --- /dev/null +++ b/benchmarks/runner/run.mjs @@ -0,0 +1,333 @@ +// Reproducible cross-library benchmark runner. +// Usage: +// pnpm bench # headless +// pnpm bench:headed # with browser window for debugging +// pnpm bench -- --runs 5 --libs tanstack,virtua # subset + +import { chromium } from '@playwright/test' +import { spawn } from 'node:child_process' +import { setTimeout as sleep } from 'node:timers/promises' +import { writeFileSync, mkdirSync } from 'node:fs' +import path from 'node:path' +import url from 'node:url' + +const __dirname = path.dirname(url.fileURLToPath(import.meta.url)) +const BENCH_DIR = path.resolve(__dirname, '..') +const PORT = 4173 +const BASE = `http://localhost:${PORT}` + +const ALL_LIBS = ['tanstack', 'virtua', 'virtuoso', 'window'] +const ALL_SCENARIOS = [ + 'mount-fixed-1k', + 'mount-fixed-10k', + 'mount-fixed-100k', + 'mount-dynamic-1k', + 'mount-dynamic-10k', + 'scroll-to-bottom-10k', + 'fast-scroll-dynamic-10k', + 'jump-to-end-dynamic-10k', + 'jump-to-middle-accuracy-dynamic-10k', + 'jump-to-last-accuracy-dynamic-10k', + 'jump-while-measuring-accuracy-dynamic-10k', + 'jump-wide-variance-accuracy-10k', +] + +function parseArgs() { + const args = process.argv.slice(2) + const out = { + headed: false, + runs: 3, + libs: ALL_LIBS, + scenarios: ALL_SCENARIOS, + useDev: false, + } + for (let i = 0; i < args.length; i++) { + const a = args[i] + if (a === '--headed') out.headed = true + else if (a === '--runs') out.runs = Number(args[++i]) + else if (a === '--libs') out.libs = args[++i].split(',') + else if (a === '--scenarios') out.scenarios = args[++i].split(',') + else if (a === '--dev') out.useDev = true + } + return out +} + +async function waitForServer(url, timeoutMs = 30_000) { + const start = Date.now() + while (Date.now() - start < timeoutMs) { + try { + const r = await fetch(url) + if (r.ok) return true + } catch {} + await sleep(200) + } + throw new Error(`server never came up at ${url}`) +} + +function spawnDevServer(useDev = false) { + const child = spawn('pnpm', [useDev ? 'dev' : 'preview'], { + cwd: BENCH_DIR, + stdio: ['ignore', 'pipe', 'pipe'], + }) + child.stdout?.on('data', (d) => + process.stderr.write(`[server] ${d.toString()}`), + ) + child.stderr?.on('data', (d) => + process.stderr.write(`[server-err] ${d.toString()}`), + ) + return child +} + +async function runScenario(page, lib, scenarioId) { + const url = `${BASE}/?lib=${lib}&scenario=${scenarioId}` + await page.goto(url, { waitUntil: 'domcontentloaded' }) + // Wait until the harness reports ready (means React mounted and registered). + await page.waitForFunction(() => !!window.bench?.ready?.(), null, { + timeout: 15_000, + }) + // Pull the scenario object back from the page so we run with the exact same + // shape the page is using. We read from window.bench.scenarios (populated + // at mount) rather than a runtime `import('/src/scenarios/types.ts')`, + // since `vite preview` only serves the built dist, not source files. + const result = await page.evaluate(async (id) => { + const scenario = window.bench?.scenarios.find((s) => s.id === id) + if (!scenario) throw new Error('unknown scenario: ' + id) + // Force GC where supported so memory readings aren't poisoned by previous run. + if ('gc' in globalThis) { + try { + globalThis.gc() + } catch {} + } + const metrics = await window.bench.run(scenario) + return { scenario, metrics } + }, scenarioId) + return result +} + +function fmt(n, digits = 1) { + if (n == null || Number.isNaN(n)) return '—' + if (Math.abs(n) >= 1000) + return n.toLocaleString(undefined, { + maximumFractionDigits: 0, + }) + return n.toFixed(digits) +} + +function median(xs) { + const ys = xs + .filter((x) => x != null && !Number.isNaN(x)) + .sort((a, b) => a - b) + if (ys.length === 0) return null + const mid = Math.floor(ys.length / 2) + return ys.length % 2 ? ys[mid] : (ys[mid - 1] + ys[mid]) / 2 +} + +function p95(xs) { + const ys = xs + .filter((x) => x != null && !Number.isNaN(x)) + .sort((a, b) => a - b) + if (ys.length === 0) return null + return ys[Math.min(ys.length - 1, Math.floor(ys.length * 0.95))] +} + +function makeTable(results, libs, scenarios) { + // For each (lib, scenario) we have N runs; pick median for table. + const cell = (lib, scenarioId, key) => { + const runs = results + .filter((r) => r.library === lib && r.scenario.id === scenarioId) + .map((r) => r.metrics[key]) + return median(runs) + } + + const sections = [ + { + title: 'Mount time — React.render → commit (lower is better, ms)', + key: 'mountMs', + scenarios: [ + 'mount-fixed-1k', + 'mount-fixed-10k', + 'mount-fixed-100k', + 'mount-dynamic-1k', + 'mount-dynamic-10k', + ], + }, + { + title: + 'Dynamic measurement — commit → stable total size (lower is better, ms)', + key: 'actionMs', + scenarios: ['mount-dynamic-1k', 'mount-dynamic-10k'], + }, + { + title: 'First paint (lower is better, ms)', + key: 'firstPaintMs', + scenarios: ['mount-fixed-1k', 'mount-fixed-10k', 'mount-fixed-100k'], + }, + { + title: 'Scroll perf — fps (higher is better)', + key: 'scrollFps', + scenarios: ['scroll-to-bottom-10k', 'fast-scroll-dynamic-10k'], + }, + { + title: 'Scroll jank — long frames count (lower is better)', + key: 'longFrames', + scenarios: ['scroll-to-bottom-10k', 'fast-scroll-dynamic-10k'], + }, + { + title: 'Jump-to-end settle time (lower is better, ms)', + key: 'actionMs', + scenarios: ['jump-to-end-dynamic-10k'], + }, + { + title: + 'scrollToIndex landing accuracy — px offset from target (lower is better)', + key: 'landingErrorPx', + scenarios: [ + 'jump-to-middle-accuracy-dynamic-10k', + 'jump-to-last-accuracy-dynamic-10k', + 'jump-while-measuring-accuracy-dynamic-10k', + 'jump-wide-variance-accuracy-10k', + ], + }, + { + title: 'Memory after mount (lower is better, MB)', + key: 'memoryBytes', + scenarios: ['mount-fixed-10k', 'mount-fixed-100k', 'mount-dynamic-10k'], + }, + ] + + const lines = [] + for (const sec of sections) { + lines.push(`\n### ${sec.title}\n`) + lines.push(`| Scenario | ${libs.map((l) => l).join(' | ')} |`) + lines.push(`|---|${libs.map(() => '---:').join('|')}|`) + for (const s of sec.scenarios) { + const cells = libs.map((l) => { + const v = cell(l, s, sec.key) + if (v == null) return '—' + if (sec.key === 'memoryBytes') return fmt(v / 1024 / 1024) + if (sec.key === 'scrollFps') return fmt(v) + return fmt(v) + }) + lines.push(`| \`${s}\` | ${cells.join(' | ')} |`) + } + } + return lines.join('\n') +} + +async function main() { + const opts = parseArgs() + console.error(`config: ${JSON.stringify(opts)}`) + + if (!opts.useDev) { + // Build the app once for the preview server (production code paths). + await new Promise((resolve, reject) => { + const c = spawn('pnpm', ['build'], { cwd: BENCH_DIR, stdio: 'inherit' }) + c.on('exit', (code) => + code === 0 ? resolve() : reject(new Error('build failed')), + ) + }) + } + + let server = null + // If a server is already listening on PORT, skip starting one. + let needsServer = true + try { + const r = await fetch(BASE) + if (r.ok) needsServer = false + } catch {} + if (needsServer) { + server = spawnDevServer(opts.useDev) + } else { + console.error('using already-running server at ' + BASE) + } + try { + await waitForServer(BASE) + const browser = await chromium.launch({ + headless: !opts.headed, + args: [ + // Precise memory reporting (otherwise bucketed to ~10MB granularity). + '--enable-precise-memory-info', + '--js-flags=--expose-gc', + // Disable network throttling and other interference. + '--disable-background-timer-throttling', + '--disable-renderer-backgrounding', + ], + }) + const context = await browser.newContext({ + viewport: { width: 800, height: 700 }, + }) + const page = await context.newPage() + + const results = [] + for (const lib of opts.libs) { + for (const scenarioId of opts.scenarios) { + for (let r = 0; r < opts.runs; r++) { + process.stderr.write( + `\n ${lib.padEnd(9)} ${scenarioId.padEnd(28)} run ${r + 1}/${opts.runs} ... `, + ) + try { + const { scenario, metrics } = await runScenario( + page, + lib, + scenarioId, + ) + results.push({ + library: lib, + scenario, + metrics, + ranAt: new Date().toISOString(), + }) + process.stderr.write( + `mount=${fmt(metrics.mountMs)}ms action=${fmt(metrics.actionMs)}ms`, + ) + } catch (e) { + process.stderr.write(`ERROR: ${e.message}`) + results.push({ + library: lib, + scenario: { id: scenarioId }, + metrics: { + mountMs: NaN, + firstPaintMs: NaN, + actionMs: NaN, + scrollFps: null, + longFrames: null, + jankMs: null, + memoryBytes: null, + landingErrorPx: null, + }, + ranAt: new Date().toISOString(), + notes: 'error: ' + e.message, + }) + } + } + } + } + + await browser.close() + + mkdirSync(path.join(BENCH_DIR, 'results'), { recursive: true }) + const stamp = new Date().toISOString().replace(/[:.]/g, '-') + writeFileSync( + path.join(BENCH_DIR, 'results', `${stamp}.json`), + JSON.stringify({ opts, results }, null, 2), + ) + + const md = makeTable(results, opts.libs, opts.scenarios) + console.log(`# Virtualization benchmarks — ${new Date().toISOString()}\n`) + console.log(`runs per cell: ${opts.runs} (table shows medians)\n`) + console.log(`libraries: ${opts.libs.join(', ')}\n`) + console.log(md) + + writeFileSync( + path.join(BENCH_DIR, 'results', 'LATEST.md'), + `# Virtualization benchmarks — ${new Date().toISOString()}\n\nruns per cell: ${opts.runs}\n${md}\n`, + ) + } finally { + server?.kill('SIGTERM') + } +} + +main().catch((e) => { + console.error(e) + process.exit(1) +}) diff --git a/benchmarks/src/lib/dataset.ts b/benchmarks/src/lib/dataset.ts new file mode 100644 index 00000000..416f98d2 --- /dev/null +++ b/benchmarks/src/lib/dataset.ts @@ -0,0 +1,89 @@ +// Deterministic dataset generation. Every library renders the SAME content for +// the same scenario, so any timing differences come from the library itself, +// not from input variance. +// +// For dynamic scenarios we vary content length so each item naturally has a +// different height (5..14 lines worth of text). For fixed scenarios every item +// is a single line of text. + +export interface Item { + id: number + // Text rendered into the item DOM. For dynamic scenarios, length varies. + text: string +} + +const WORDS = [ + 'alpha', + 'bravo', + 'charlie', + 'delta', + 'echo', + 'foxtrot', + 'golf', + 'hotel', + 'india', + 'juliet', + 'kilo', + 'lima', + 'mike', + 'november', + 'oscar', + 'papa', + 'quebec', + 'romeo', + 'sierra', + 'tango', + 'uniform', + 'victor', + 'whiskey', + 'x-ray', + 'yankee', + 'zulu', +] + +// Simple LCG so the same seed yields the same sequence in any JS runtime. +function lcg(seed: number) { + let s = seed >>> 0 + return () => { + s = (s * 1664525 + 1013904223) >>> 0 + return s / 0x100000000 + } +} + +export function makeDataset( + count: number, + dynamic: boolean, + wideVariance = false, +): Array { + const rand = lcg(424242) + const items: Array = new Array(count) + for (let i = 0; i < count; i++) { + if (dynamic) { + if (wideVariance) { + // Wide-variance dataset: heights span ~30..500 px (≈16× ratio). + // 1 → 50 words distributed log-normally so most items are short + // but a meaningful tail is very tall. + const wc = 1 + Math.floor(Math.pow(rand(), 2) * 49) + const parts: Array = new Array(wc) + for (let w = 0; w < wc; w++) { + parts[w] = WORDS[Math.floor(rand() * WORDS.length)]! + } + items[i] = { id: i, text: `#${i} ${parts.join(' ')}` } + } else { + // 5..14 words → ~ one line; lengths picked deterministically. + const wc = 5 + Math.floor(rand() * 10) + const parts: Array = new Array(wc) + for (let w = 0; w < wc; w++) { + parts[w] = WORDS[Math.floor(rand() * WORDS.length)]! + } + // 25% of dynamic items get a multi-line burst for height variation. + const burst = + rand() < 0.25 ? ' ' + parts.join(' ') + ' ' + parts.join(' ') : '' + items[i] = { id: i, text: `#${i} ${parts.join(' ')}${burst}` } + } + } else { + items[i] = { id: i, text: `Item ${i}` } + } + } + return items +} diff --git a/benchmarks/src/lib/harness.ts b/benchmarks/src/lib/harness.ts new file mode 100644 index 00000000..141f00c0 --- /dev/null +++ b/benchmarks/src/lib/harness.ts @@ -0,0 +1,330 @@ +import { SCENARIOS } from '../scenarios/types' +import type { ScenarioInput, ScenarioMetrics } from '../scenarios/types' + +// Each library page mounts and waits, then a global driver runs the scripted +// action and returns metrics. To keep measurements uniform we share this +// harness. + +export interface HarnessHandle { + /** Container element the library is told to scroll. */ + getScrollContainer: () => HTMLElement | null + /** Programmatically scroll to a target offset (px). */ + scrollToOffset?: (offset: number) => void + /** Programmatically scroll to a target index. Some libraries expose + * scrollToIndex; if absent, harness falls back to scrollTo(maxOffset). */ + scrollToIndex?: (index: number, opts?: { align?: 'start' | 'end' }) => void + /** Total scrollable height in px. Read after mount. */ + getTotalSize: () => number + /** Returns true once every item in the visible range has had its real size + * measured. Used for the wait-dynamic-measure action. */ + isFullyMeasured?: () => boolean +} + +declare global { + interface Window { + __bench?: { + handle?: HarnessHandle + mountStart?: number + mountEnd?: number + firstPaintEnd?: number + ready?: boolean + } + bench?: { + run: (scenario: ScenarioInput) => Promise + ready: () => boolean + // Exposed so the Node-side Playwright runner can resolve a scenario + // id to its full object without a runtime source-file import (which + // wouldn't survive `vite preview`'s built-only serving). + scenarios: ReadonlyArray + } + } +} + +function nextFrame(): Promise { + return new Promise((resolve) => requestAnimationFrame(resolve)) +} + +function waitFor( + predicate: () => T | false | null | undefined, + timeoutMs = 8000, +): Promise { + return new Promise((resolve, reject) => { + const start = performance.now() + const tick = () => { + const r = predicate() + if (r) return resolve(r as T) + if (performance.now() - start > timeoutMs) { + return reject(new Error('timeout waiting for predicate')) + } + requestAnimationFrame(tick) + } + tick() + }) +} + +async function measureScrollFps( + el: HTMLElement, + startOffset: number, + targetOffset: number, + durationMs = 1500, +): Promise<{ fps: number; longFrames: number; jankMs: number }> { + // Programmatic, requestAnimationFrame-driven scroll. We sample frame + // timestamps and infer FPS / jank from inter-frame gaps. + const frames: number[] = [] + let lastT = performance.now() + let stop = false + const onFrame = (t: number) => { + frames.push(t - lastT) + lastT = t + if (!stop) requestAnimationFrame(onFrame) + } + requestAnimationFrame((t) => { + lastT = t + requestAnimationFrame(onFrame) + }) + + const startT = performance.now() + while (performance.now() - startT < durationMs) { + const elapsed = performance.now() - startT + const t = Math.min(elapsed / durationMs, 1) + el.scrollTop = startOffset + (targetOffset - startOffset) * t + await nextFrame() + } + stop = true + await nextFrame() + + const longFrames = frames.filter((f) => f > 32).length + const jankMs = frames.filter((f) => f > 50).reduce((s, f) => s + f, 0) + const avgFrame = frames.length + ? frames.reduce((s, f) => s + f, 0) / frames.length + : 0 + const fps = avgFrame > 0 ? 1000 / avgFrame : 0 + return { fps, longFrames, jankMs } +} + +export function registerHarness(handle: HarnessHandle): void { + window.__bench = window.__bench || {} + window.__bench.handle = handle + window.__bench.ready = true +} + +export function markMountStart(): void { + window.__bench = window.__bench || {} + window.__bench.mountStart = performance.now() +} + +export function markMountEnd(): void { + window.__bench = window.__bench || {} + if (window.__bench.mountEnd == null) { + window.__bench.mountEnd = performance.now() + } +} + +export function markFirstPaint(): void { + // Wait one rAF then mark — gives the browser a chance to actually paint. + requestAnimationFrame(() => { + window.__bench = window.__bench || {} + if (window.__bench.firstPaintEnd == null) { + window.__bench.firstPaintEnd = performance.now() + } + }) +} + +export function installBenchAPI(): void { + window.bench = { + ready: () => !!window.__bench?.ready, + scenarios: SCENARIOS, + run: async (scenario: ScenarioInput): Promise => { + const h = await waitFor(() => window.__bench?.handle ?? null) + const mountStart = window.__bench?.mountStart ?? 0 + const mountEnd = window.__bench?.mountEnd ?? performance.now() + const firstPaintEnd = window.__bench?.firstPaintEnd ?? performance.now() + + const mountMs = Math.max(0, mountEnd - mountStart) + const firstPaintMs = Math.max(0, firstPaintEnd - mountStart) + + let actionMs: number | null = null + let scrollFps: number | null = null + let longFrames: number | null = null + let jankMs: number | null = null + + const container = h.getScrollContainer() + if (!container) { + throw new Error('harness: scroll container not available') + } + + if (scenario.action === 'scroll-to-bottom') { + const total = h.getTotalSize() + const target = Math.max(0, total - container.clientHeight) + const t0 = performance.now() + const r = await measureScrollFps(container, 0, target, 1500) + actionMs = performance.now() - t0 + scrollFps = r.fps + longFrames = r.longFrames + jankMs = r.jankMs + } else if (scenario.action === 'jump-to-end') { + const t0 = performance.now() + if (h.scrollToIndex) { + h.scrollToIndex(scenario.count - 1, { align: 'end' }) + } else { + const total = h.getTotalSize() + container.scrollTop = total + } + // Wait for scroll position to settle and not change for 5 frames + let stableCount = 0 + let lastTop = container.scrollTop + while (stableCount < 5 && performance.now() - t0 < 5000) { + await nextFrame() + const cur = container.scrollTop + if (Math.abs(cur - lastTop) < 1) stableCount++ + else stableCount = 0 + lastTop = cur + } + actionMs = performance.now() - t0 + } else if (scenario.action === 'jump-to-middle-accuracy') { + // Accuracy test: ask the library to scroll to a specific index in + // the middle of a dynamic-height list, then verify how close the + // resulting scroll position is to where that item *actually* lives. + // Smaller landingErrorPx means more accurate scrollToIndex. + const targetIndex = Math.floor(scenario.count / 2) // e.g. 5000 of 10000 + const t0 = performance.now() + if (h.scrollToIndex) { + h.scrollToIndex(targetIndex, { align: 'start' }) + } + // Wait for the scroll to fully settle. + let stableCount = 0 + let lastTop = container.scrollTop + while (stableCount < 8 && performance.now() - t0 < 5000) { + await nextFrame() + const cur = container.scrollTop + if (Math.abs(cur - lastTop) < 0.5) stableCount++ + else stableCount = 0 + lastTop = cur + } + actionMs = performance.now() - t0 + + // Now: find the DOM element for the target index. Its viewport-relative + // top tells us where it actually landed. With align:'start', we want + // item[targetIndex]'s top to be at viewport top — i.e., offset 0. + const itemSelector = `[data-index="${targetIndex}"]` + const itemEl = container.querySelector( + itemSelector, + ) as HTMLElement | null + if (itemEl) { + const itemRect = itemEl.getBoundingClientRect() + const containerRect = container.getBoundingClientRect() + // Distance from container's top to item's top — should be ≈ 0 + // for align:'start'. Anything > 1px is a landing error. + ;(window as any).__landingErrorPx = Math.abs( + itemRect.top - containerRect.top, + ) + } else { + // Item not in the DOM at all — major accuracy failure + ;(window as any).__landingErrorPx = -1 + } + } else if ( + scenario.action === 'jump-to-last-accuracy' || + scenario.action === 'jump-while-measuring-accuracy' || + scenario.action === 'jump-wide-variance-accuracy' + ) { + // Three accuracy edge cases sharing the same measurement skeleton: + // - jump-to-last: align='end', target = last index. Tests cumulative + // prefix-sum error on dynamic lists; end-alignment amplifies any + // drift between estimates and real measurements. + // - jump-while-measuring: scroll BEFORE the initial visible window + // has finished measuring. The race condition that competitors + // handle differently (virtuoso retries, virtua pre-measures). + // - jump-wide-variance: 30..500px items, 16x size variance vs the + // 30px estimate. Tests how each lib converges when estimates are + // drastically wrong. + const isLast = scenario.action === 'jump-to-last-accuracy' + const isWhileMeasuring = + scenario.action === 'jump-while-measuring-accuracy' + // Target choice + alignment per case + const targetIndex = isLast + ? scenario.count - 1 + : Math.floor(scenario.count / 2) + const align: 'start' | 'end' = isLast ? 'end' : 'start' + + // For jump-while-measuring, do NOT wait — scroll immediately so the + // race condition is realistic. For others, wait a tick to allow + // initial measurements. + if (!isWhileMeasuring) { + await nextFrame() + } + + const t0 = performance.now() + if (h.scrollToIndex) { + h.scrollToIndex(targetIndex, { align }) + } + // Wait for scroll to fully settle + let stableCount = 0 + let lastTop = container.scrollTop + while (stableCount < 8 && performance.now() - t0 < 5000) { + await nextFrame() + const cur = container.scrollTop + if (Math.abs(cur - lastTop) < 0.5) stableCount++ + else stableCount = 0 + lastTop = cur + } + actionMs = performance.now() - t0 + + // Compute landing error: distance between the relevant edge of the + // target item and the relevant edge of the viewport. + const itemEl = container.querySelector( + `[data-index="${targetIndex}"]`, + ) as HTMLElement | null + if (itemEl) { + const iRect = itemEl.getBoundingClientRect() + const cRect = container.getBoundingClientRect() + const err = + align === 'end' + ? Math.abs(iRect.bottom - cRect.bottom) + : Math.abs(iRect.top - cRect.top) + ;(window as any).__landingErrorPx = err + } else { + ;(window as any).__landingErrorPx = -1 + } + } else if (scenario.action === 'wait-dynamic-measure') { + // Uniform metric across libraries: time until the total scroll height + // stops changing for 8 consecutive frames. Libraries finish measuring + // their visible window in different ways but they all converge on a + // stable getTotalSize(). + const t0 = performance.now() + let lastTotal = h.getTotalSize() + let stableCount = 0 + while (stableCount < 8 && performance.now() - t0 < 3000) { + await nextFrame() + const cur = h.getTotalSize() + if (cur === lastTotal && cur > 0) stableCount++ + else stableCount = 0 + lastTotal = cur + } + actionMs = performance.now() - t0 + } + + const mem = (performance as any).memory + const memoryBytes = + mem && typeof mem.usedJSHeapSize === 'number' + ? mem.usedJSHeapSize + : null + + const landingErrorPx = + typeof (window as any).__landingErrorPx === 'number' + ? (window as any).__landingErrorPx + : null + ;(window as any).__landingErrorPx = undefined + + return { + mountMs, + firstPaintMs, + actionMs, + scrollFps, + longFrames, + jankMs, + memoryBytes, + landingErrorPx, + } + }, + } +} diff --git a/benchmarks/src/main.tsx b/benchmarks/src/main.tsx new file mode 100644 index 00000000..e4ceca2c --- /dev/null +++ b/benchmarks/src/main.tsx @@ -0,0 +1,49 @@ +import { StrictMode } from 'react' +import { createRoot } from 'react-dom/client' +import { TanstackPageRoot } from './pages/TanstackPage' +import { VirtuaPageRoot } from './pages/VirtuaPage' +import { VirtuosoPageRoot } from './pages/VirtuosoPage' +import { WindowPageRoot } from './pages/WindowPage' +import { installBenchAPI } from './lib/harness' +import { + SCENARIOS, + type LibraryName, + type ScenarioInput, +} from './scenarios/types' + +// Install window.bench BEFORE React renders so the Playwright runner can +// wait for it deterministically. +installBenchAPI() + +function readQuery(): { lib: LibraryName; scenario: ScenarioInput } { + const q = new URLSearchParams(window.location.search) + const lib = (q.get('lib') ?? 'tanstack') as LibraryName + const id = q.get('scenario') ?? 'mount-fixed-1k' + const scenario = SCENARIOS.find((s) => s.id === id) ?? SCENARIOS[0]! + return { lib, scenario } +} + +function App() { + const { lib, scenario } = readQuery() + switch (lib) { + case 'tanstack': + return + case 'virtua': + return + case 'virtuoso': + return + case 'window': + return + default: + return ( +
+

Unknown library: {lib}

+

Try ?lib=tanstack&scenario=mount-fixed-1k

+
+ ) + } +} + +const root = createRoot(document.getElementById('root')!) +// We measure raw library cost, not StrictMode's double-render. Run without it. +root.render() diff --git a/benchmarks/src/pages/TanstackPage.tsx b/benchmarks/src/pages/TanstackPage.tsx new file mode 100644 index 00000000..02157bae --- /dev/null +++ b/benchmarks/src/pages/TanstackPage.tsx @@ -0,0 +1,107 @@ +import { useEffect, useMemo, useRef } from 'react' +import { useVirtualizer } from '@tanstack/react-virtual' +import { + markFirstPaint, + markMountEnd, + markMountStart, + registerHarness, +} from '../lib/harness' +import { makeDataset } from '../lib/dataset' +import type { ScenarioInput } from '../scenarios/types' + +interface Props { + scenario: ScenarioInput +} + +export function TanstackPage({ scenario }: Props) { + // Mount-start mark is set BEFORE this component renders by main.tsx. + const items = useMemo( + () => + makeDataset( + scenario.count, + scenario.dynamic, + scenario.action === 'jump-wide-variance-accuracy', + ), + [scenario.count, scenario.dynamic, scenario.action], + ) + + const parentRef = useRef(null) + + const virtualizer = useVirtualizer({ + count: items.length, + getScrollElement: () => parentRef.current, + estimateSize: () => scenario.itemSize, + overscan: 5, + }) + + // Register the bench harness once we have a ref. + useEffect(() => { + registerHarness({ + getScrollContainer: () => parentRef.current, + scrollToIndex: (i, opts) => + virtualizer.scrollToIndex(i, { align: opts?.align ?? 'start' }), + getTotalSize: () => virtualizer.getTotalSize(), + isFullyMeasured: () => { + // For dynamic scenarios, all items must have a measured size in + // measurementsCache (size differs from estimateSize). Because we + // render with overscan only, "fully measured" here means: scroll + // position reaches a steady state. We use cache size as a proxy. + const sized = (virtualizer.measurementsCache ?? []).filter( + (m) => m.size !== scenario.itemSize, + ).length + // For static scenarios there's nothing to wait on. + if (!scenario.dynamic) return true + // ~visible window size; dynamic mount only renders visible+overscan + // so this is the right proxy for "done with first measurement pass". + return sized > 0 + }, + }) + markMountEnd() + markFirstPaint() + }, [virtualizer, scenario.dynamic, scenario.itemSize]) + + return ( +
+
+ {virtualizer.getVirtualItems().map((vi) => { + const item = items[vi.index]! + return ( +
+ {item.text} +
+ ) + })} +
+
+ ) +} + +// Convenience: page-level wrapper that calls markMountStart synchronously. +// Used by main.tsx for every library. +export function TanstackPageRoot({ scenario }: Props) { + markMountStart() + return +} diff --git a/benchmarks/src/pages/VirtuaPage.tsx b/benchmarks/src/pages/VirtuaPage.tsx new file mode 100644 index 00000000..f3040675 --- /dev/null +++ b/benchmarks/src/pages/VirtuaPage.tsx @@ -0,0 +1,98 @@ +import { useEffect, useMemo, useRef } from 'react' +import { VList, type VListHandle } from 'virtua' +import { + markFirstPaint, + markMountEnd, + markMountStart, + registerHarness, +} from '../lib/harness' +import { makeDataset } from '../lib/dataset' +import type { ScenarioInput } from '../scenarios/types' + +interface Props { + scenario: ScenarioInput +} + +export function VirtuaPage({ scenario }: Props) { + const items = useMemo( + () => + makeDataset( + scenario.count, + scenario.dynamic, + scenario.action === 'jump-wide-variance-accuracy', + ), + [scenario.count, scenario.dynamic, scenario.action], + ) + + const ref = useRef(null) + const hostRef = useRef(null) + const measuredSet = useRef(new Set()) + + useEffect(() => { + registerHarness({ + getScrollContainer: () => hostRef.current, + scrollToIndex: (i, opts) => + ref.current?.scrollToIndex(i, { + align: opts?.align ?? 'start', + }), + getTotalSize: () => { + // VList sets scrollSize implicitly on its sized inner div; prefer + // that node's scrollHeight, then firstElementChild, then host. + const el = hostRef.current?.querySelector( + '[style*="height:"]', + ) as HTMLElement | null + return ( + el?.scrollHeight ?? + (hostRef.current?.firstElementChild as HTMLElement | null) + ?.scrollHeight ?? + hostRef.current?.scrollHeight ?? + 0 + ) + }, + isFullyMeasured: () => { + if (!scenario.dynamic) return true + // virtua measures items as they enter viewport; "fully measured" is a + // proxy: at least the visible window has been observed once. + return measuredSet.current.size >= 10 + }, + }) + markMountEnd() + markFirstPaint() + }, [scenario.dynamic]) + + return ( +
+ ( +
+ {data.text} +
+ )} + onScroll={() => { + // VList doesn't expose visible range directly; mark progress. + measuredSet.current.add(measuredSet.current.size) + }} + /> +
+ ) +} + +export function VirtuaPageRoot({ scenario }: Props) { + markMountStart() + return +} diff --git a/benchmarks/src/pages/VirtuosoPage.tsx b/benchmarks/src/pages/VirtuosoPage.tsx new file mode 100644 index 00000000..7851aa37 --- /dev/null +++ b/benchmarks/src/pages/VirtuosoPage.tsx @@ -0,0 +1,99 @@ +import { useEffect, useMemo, useRef } from 'react' +import { Virtuoso, type VirtuosoHandle } from 'react-virtuoso' +import { + markFirstPaint, + markMountEnd, + markMountStart, + registerHarness, +} from '../lib/harness' +import { makeDataset } from '../lib/dataset' +import type { ScenarioInput } from '../scenarios/types' + +interface Props { + scenario: ScenarioInput +} + +export function VirtuosoPage({ scenario }: Props) { + const items = useMemo( + () => + makeDataset( + scenario.count, + scenario.dynamic, + scenario.action === 'jump-wide-variance-accuracy', + ), + [scenario.count, scenario.dynamic, scenario.action], + ) + + const ref = useRef(null) + const hostRef = useRef(null) + const measuredRef = useRef(0) + + useEffect(() => { + registerHarness({ + getScrollContainer: () => { + // Virtuoso owns its own scroll container internally. + return ( + (hostRef.current?.querySelector( + '[data-testid="virtuoso-scroller"]', + ) as HTMLElement | null) ?? hostRef.current + ) + }, + scrollToIndex: (i, opts) => + ref.current?.scrollToIndex({ + index: i, + align: opts?.align === 'end' ? 'end' : 'start', + behavior: 'auto', + }), + getTotalSize: () => { + // Virtuoso renders a tall inner div; read its height. + const scroller = hostRef.current?.querySelector( + '[data-testid="virtuoso-scroller"]', + ) as HTMLElement | null + return scroller?.scrollHeight ?? 0 + }, + isFullyMeasured: () => { + if (!scenario.dynamic) return true + return measuredRef.current >= 10 + }, + }) + markMountEnd() + markFirstPaint() + }, [scenario.dynamic]) + + return ( +
+ { + measuredRef.current = Math.max(measuredRef.current, r.endIndex) + }} + fixedItemHeight={scenario.dynamic ? undefined : scenario.itemSize} + itemContent={(i) => { + const item = items[i]! + return ( +
+ {item.text} +
+ ) + }} + /> +
+ ) +} + +export function VirtuosoPageRoot({ scenario }: Props) { + markMountStart() + return +} diff --git a/benchmarks/src/pages/WindowPage.tsx b/benchmarks/src/pages/WindowPage.tsx new file mode 100644 index 00000000..771e4ffa --- /dev/null +++ b/benchmarks/src/pages/WindowPage.tsx @@ -0,0 +1,103 @@ +import { useEffect, useMemo, useRef } from 'react' +import { + List, + useDynamicRowHeight, + useListRef, + type RowComponentProps, +} from 'react-window' +import { + markFirstPaint, + markMountEnd, + markMountStart, + registerHarness, +} from '../lib/harness' +import { makeDataset, type Item } from '../lib/dataset' +import type { ScenarioInput } from '../scenarios/types' + +interface Props { + scenario: ScenarioInput +} + +function Row({ + index, + style, + items, + ariaAttributes, +}: RowComponentProps<{ items: Item[] }>) { + const item = items[index]! + return ( +
+ {item.text} +
+ ) +} + +export function WindowPage({ scenario }: Props) { + const items = useMemo( + () => + makeDataset( + scenario.count, + scenario.dynamic, + scenario.action === 'jump-wide-variance-accuracy', + ), + [scenario.count, scenario.dynamic, scenario.action], + ) + + const hostRef = useRef(null) + const listRef = useListRef() + const dynamic = useDynamicRowHeight({ defaultRowHeight: scenario.itemSize }) + + useEffect(() => { + registerHarness({ + getScrollContainer: () => { + // react-window v2 mounts the scrolling element as the first child. + return ( + (hostRef.current?.firstElementChild as HTMLElement | null) ?? + hostRef.current + ) + }, + scrollToIndex: (i, opts) => + listRef.current?.scrollToRow({ + index: i, + align: opts?.align ?? 'start', + behavior: 'instant', + }), + getTotalSize: () => { + const el = hostRef.current?.firstElementChild as HTMLElement | null + return el?.scrollHeight ?? 0 + }, + isFullyMeasured: () => { + if (!scenario.dynamic) return true + const avg = dynamic.getAverageRowHeight() + return avg > 0 + }, + }) + markMountEnd() + markFirstPaint() + }, [listRef, dynamic, scenario.dynamic]) + + return ( +
+ + listRef={listRef} + rowComponent={Row} + rowCount={items.length} + rowProps={{ items }} + rowHeight={scenario.dynamic ? dynamic : scenario.itemSize} + defaultHeight={600} + style={{ height: '100%', width: '100%' }} + overscanCount={5} + /> +
+ ) +} + +export function WindowPageRoot({ scenario }: Props) { + markMountStart() + return +} diff --git a/benchmarks/src/scenarios/types.ts b/benchmarks/src/scenarios/types.ts new file mode 100644 index 00000000..48210d16 --- /dev/null +++ b/benchmarks/src/scenarios/types.ts @@ -0,0 +1,154 @@ +// Shared scenario definitions used by every library page + the Playwright runner. +// JSON-serializable so the runner can pass them as JS args via page.evaluate(). + +export type LibraryName = 'tanstack' | 'virtua' | 'virtuoso' | 'window' + +export interface ScenarioInput { + /** Stable id used for table keys and result filenames. */ + id: string + /** Number of items to render. */ + count: number + /** Fixed item size in px (lower bound used as estimate when dynamic). */ + itemSize: number + /** If true, items vary in height by content; forces ResizeObserver storms. */ + dynamic: boolean + /** Which scripted action to run after mount. */ + action: + | 'idle' + | 'scroll-to-bottom' + | 'jump-to-end' + | 'jump-to-middle-accuracy' + | 'jump-to-last-accuracy' + | 'jump-while-measuring-accuracy' + | 'jump-wide-variance-accuracy' + | 'wait-dynamic-measure' +} + +export interface ScenarioMetrics { + /** ms from React.render call to "list is mounted" (first item rendered). */ + mountMs: number + /** ms from React.render to a fully painted first frame. */ + firstPaintMs: number + /** Action-specific. For scroll-to-bottom: total animation ms. For wait-dynamic-measure: total ms. */ + actionMs: number | null + /** FPS averaged during the scripted action (scroll), or null. */ + scrollFps: number | null + /** Number of dropped frames during the action (frames longer than 32ms). */ + longFrames: number | null + /** Sum of frame durations > 50ms ("long tasks") during the action, in ms. */ + jankMs: number | null + /** Heap snapshot after mount (Chromium only; null elsewhere). */ + memoryBytes: number | null + /** Accuracy metric for jump-to-middle: |actual landing position - target| in pixels. + * Lower is better. Null for scenarios that don't measure accuracy. */ + landingErrorPx: number | null +} + +export interface ScenarioResult { + library: LibraryName + scenario: ScenarioInput + metrics: ScenarioMetrics + /** ISO timestamp the scenario ran. */ + ranAt: string + /** Notes from the page (e.g. opt-outs, library-specific caveats). */ + notes?: string +} + +// The fixed scenarios all libraries run. Adding scenarios here surfaces them +// in the runner without further plumbing. +export const SCENARIOS: Array = [ + { + id: 'mount-fixed-1k', + count: 1_000, + itemSize: 30, + dynamic: false, + action: 'idle', + }, + { + id: 'mount-fixed-10k', + count: 10_000, + itemSize: 30, + dynamic: false, + action: 'idle', + }, + { + id: 'mount-fixed-100k', + count: 100_000, + itemSize: 30, + dynamic: false, + action: 'idle', + }, + { + id: 'mount-dynamic-1k', + count: 1_000, + itemSize: 30, + dynamic: true, + action: 'wait-dynamic-measure', + }, + { + id: 'mount-dynamic-10k', + count: 10_000, + itemSize: 30, + dynamic: true, + action: 'wait-dynamic-measure', + }, + { + id: 'scroll-to-bottom-10k', + count: 10_000, + itemSize: 30, + dynamic: false, + action: 'scroll-to-bottom', + }, + { + id: 'fast-scroll-dynamic-10k', + count: 10_000, + itemSize: 30, + dynamic: true, + action: 'scroll-to-bottom', + }, + { + id: 'jump-to-end-dynamic-10k', + count: 10_000, + itemSize: 30, + dynamic: true, + action: 'jump-to-end', + }, + { + id: 'jump-to-middle-accuracy-dynamic-10k', + count: 10_000, + itemSize: 30, + dynamic: true, + action: 'jump-to-middle-accuracy', + }, + { + // End-alignment edge case: scrollToIndex(last, { align: 'end' }) should + // pin the last item to the bottom of the viewport. The cumulative size + // sum on dynamic items can drift from estimates, and end-alignment + // amplifies any prefix-sum error. + id: 'jump-to-last-accuracy-dynamic-10k', + count: 10_000, + itemSize: 30, + dynamic: true, + action: 'jump-to-last-accuracy', + }, + { + // Race condition: scrollToIndex called BEFORE the visible items have + // measured. Tests how each library handles target drift while + // simultaneous measurements come in. + id: 'jump-while-measuring-accuracy-dynamic-10k', + count: 10_000, + itemSize: 30, + dynamic: true, + action: 'jump-while-measuring-accuracy', + }, + { + // Wide size variance: items range 30..500px. estimateSize stays at 30. + // The 16x gap between estimate and actual exaggerates the running + // prefix-sum error that scrollToIndex relies on. + id: 'jump-wide-variance-accuracy-10k', + count: 10_000, + itemSize: 30, + dynamic: true, + action: 'jump-wide-variance-accuracy', + }, +] diff --git a/benchmarks/tsconfig.json b/benchmarks/tsconfig.json new file mode 100644 index 00000000..2bfbac12 --- /dev/null +++ b/benchmarks/tsconfig.json @@ -0,0 +1,18 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "ESNext", + "moduleResolution": "Bundler", + "lib": ["ES2022", "DOM", "DOM.Iterable"], + "jsx": "react-jsx", + "strict": true, + "noEmit": true, + "isolatedModules": true, + "esModuleInterop": true, + "skipLibCheck": true, + "allowSyntheticDefaultImports": true, + "resolveJsonModule": true, + "types": ["vite/client"] + }, + "include": ["src", "runner"] +} diff --git a/benchmarks/vite.config.ts b/benchmarks/vite.config.ts new file mode 100644 index 00000000..091db451 --- /dev/null +++ b/benchmarks/vite.config.ts @@ -0,0 +1,13 @@ +import { defineConfig } from 'vite' +import react from '@vitejs/plugin-react' + +export default defineConfig({ + plugins: [react()], + server: { + port: 4173, + strictPort: true, + }, + build: { + target: 'esnext', + }, +}) diff --git a/docs/api/virtualizer.md b/docs/api/virtualizer.md index 54542063..a7af4d63 100644 --- a/docs/api/virtualizer.md +++ b/docs/api/virtualizer.md @@ -273,6 +273,18 @@ isRtl: boolean Whether to invert horizontal scrolling to support right-to-left language locales. +### `initialMeasurementsCache` + +```tsx +initialMeasurementsCache: Array +``` + +**Default:** `[]` + +A previously-captured snapshot of measured item sizes (from `takeSnapshot()`) to seed the virtualizer with on mount. Useful for restoring scroll position after navigation: persist the result of `takeSnapshot()` (plus the current `scrollOffset`) in your route state, then pass them back as `initialMeasurementsCache` and `initialOffset` to land users at the same position without re-measuring everything from scratch. + +Items not present in the cache fall back to `estimateSize`; items present have their measured `size` restored. The cache is consumed only once, on the first `getMeasurements()` call after mount. + ### `useAnimationFrameWithResizeObserver` ```tsx @@ -393,6 +405,38 @@ measure: () => void Resets any prev item measurements. +### `takeSnapshot` + +```tsx +takeSnapshot: () => Array +``` + +Returns a snapshot of currently-measured items as plain `VirtualItem` +objects, suitable for round-tripping through state storage and feeding +back as `initialMeasurementsCache` on remount. Pair with the current +`scrollOffset` to restore exact scroll position after navigation. + +Only items the consumer has actually rendered (and thus measured) appear +in the snapshot; unmeasured items will fall back to `estimateSize` on +restore. Returns an empty array if no items have been measured. + +```tsx +// Capture state on unmount +const snapshot = virtualizer.takeSnapshot() +const offset = virtualizer.scrollOffset +sessionStorage.setItem('myList', JSON.stringify({ snapshot, offset })) + +// Restore on remount +const saved = JSON.parse(sessionStorage.getItem('myList') ?? 'null') +useVirtualizer({ + count: items.length, + estimateSize: () => 50, + getScrollElement: () => parentRef.current, + initialMeasurementsCache: saved?.snapshot, + initialOffset: saved?.offset, +}) +``` + ### `measureElement` ```tsx @@ -438,7 +482,11 @@ Current `Rect` of the scroll element. shouldAdjustScrollPositionOnItemSizeChange: undefined | ((item: VirtualItem, delta: number, instance: Virtualizer) => boolean) ``` -The shouldAdjustScrollPositionOnItemSizeChange method enables fine-grained control over the adjustment of scroll position when the size of dynamically rendered items differs from the estimated size. When jumping in the middle of the list and scrolling backward new elements may have a different size than the initially estimated size. This discrepancy can cause subsequent items to shift, potentially disrupting the user's scrolling experience, particularly when navigating backward through the list. +Provides fine-grained control over the scroll-position adjustment that fires when an above-viewport item's measured size differs from its estimated size. By default the virtualizer applies this correction only when the user is **not** scrolling backward, which avoids the well-known "items jump while scrolling up" jank. Supply this callback only if you want to override that default — for example, to apply corrections during backward scroll, or to skip them in additional scenarios. + +The callback receives the resized `item`, the size `delta`, and the `instance`; return `true` to apply the scroll adjustment, `false` to skip it. + +On iOS WebKit, scroll-position writes are deferred regardless of this callback while a finger is on screen, during momentum-scroll, and during elastic-overscroll bounce. The cumulative delta is flushed in a single write once the scroll settles, preserving iOS's native momentum physics. ### `isScrolling` diff --git a/knip.json b/knip.json index 490dfd01..6babde9d 100644 --- a/knip.json +++ b/knip.json @@ -1,6 +1,6 @@ { "$schema": "https://unpkg.com/knip@5/schema.json", - "ignoreWorkspaces": ["examples/**"], + "ignoreWorkspaces": ["examples/**", "benchmarks"], "ignoreDependencies": ["@angular/cli"], "ignore": ["packages/react-virtual/e2e/app/**"] } diff --git a/packages/react-virtual/src/index.tsx b/packages/react-virtual/src/index.tsx index 313c3d4f..89678ad6 100644 --- a/packages/react-virtual/src/index.tsx +++ b/packages/react-virtual/src/index.tsx @@ -33,7 +33,7 @@ function useVirtualizerBase< TScrollElement, TItemElement > { - const rerender = React.useReducer(() => ({}), {})[1] + const rerender = React.useReducer((x: number) => x + 1, 0)[1] const resolvedOptions: VirtualizerOptions = { ...options, diff --git a/packages/virtual-core/src/index.ts b/packages/virtual-core/src/index.ts index 75dcbdb7..a1e9dcc7 100644 --- a/packages/virtual-core/src/index.ts +++ b/packages/virtual-core/src/index.ts @@ -1,6 +1,29 @@ +import { createLazyMeasurementsView } from './lazy-measurements' import { approxEqual, debounce, memo, notUndefined } from './utils' -export * from './utils' +// Browser-aware iOS detection. Programmatic `scrollTo`/`scrollTop` writes +// during a momentum-scroll cancel the momentum on iOS WebKit, so we defer +// scroll-position adjustments triggered by mid-scroll resizes until the +// scroll settles. SSR-safe (returns false when navigator is unavailable). +let _isIOSResult: boolean | undefined +const isIOSWebKit = (): boolean => { + if (_isIOSResult !== undefined) return _isIOSResult + if (typeof navigator === 'undefined') return (_isIOSResult = false) + if (/iP(hone|od|ad)/.test(navigator.userAgent)) return (_isIOSResult = true) + // iPadOS 13+ reports as MacIntel; touch-points distinguishes it from desktop. + const mtp = (navigator as Navigator & { maxTouchPoints?: number }) + .maxTouchPoints + return (_isIOSResult = + navigator.platform === 'MacIntel' && mtp !== undefined && mtp > 0) +} + +// Test hook: reset the iOS detection cache. Not exported. +export const _resetIOSDetectionForTests = () => { + _isIOSResult = undefined +} + +export { approxEqual, debounce, memo, notUndefined } from './utils' +export type { NoInfer, PartialKeys } from './utils' // @@ -54,13 +77,12 @@ export const defaultKeyExtractor = (index: number) => index export const defaultRangeExtractor = (range: Range) => { const start = Math.max(range.startIndex - range.overscan, 0) const end = Math.min(range.endIndex + range.overscan, range.count - 1) + const len = end - start + 1 - const arr = [] - - for (let i = start; i <= end; i++) { - arr.push(i) + const arr = new Array(len) + for (let i = 0; i < len; i++) { + arr[i] = start + i } - return arr } @@ -143,9 +165,13 @@ const supportsScrollend = type ObserveOffsetCallBack = (offset: number, isScrolling: boolean) => void -export const observeElementOffset = ( +// Shared core: both element and window variants attach scroll/scrollend +// listeners with the same lifecycle; they only differ in how to read the +// current offset from the scroll target. +const observeOffset = ( instance: Virtualizer, cb: ObserveOffsetCallBack, + readOffset: (target: T) => number, ) => { const element = instance.scrollElement if (!element) { @@ -156,32 +182,27 @@ export const observeElementOffset = ( return } - let offset = 0 - const fallback = + const registerScrollendEvent = instance.options.useScrollendEvent && supportsScrollend - ? () => undefined - : debounce( - targetWindow, - () => { - cb(offset, false) - }, - instance.options.isScrollingResetDelay, - ) + + let offset = 0 + const fallback = registerScrollendEvent + ? null + : debounce( + targetWindow, + () => cb(offset, false), + instance.options.isScrollingResetDelay, + ) const createHandler = (isScrolling: boolean) => () => { - const { horizontal, isRtl } = instance.options - offset = horizontal - ? element['scrollLeft'] * ((isRtl && -1) || 1) - : element['scrollTop'] - fallback() + offset = readOffset(element) + fallback?.() cb(offset, isScrolling) } const handler = createHandler(true) const endHandler = createHandler(false) element.addEventListener('scroll', handler, addEventListenerOptions) - const registerScrollendEvent = - instance.options.useScrollendEvent && supportsScrollend if (registerScrollendEvent) { element.addEventListener('scrollend', endHandler, addEventListenerOptions) } @@ -193,52 +214,22 @@ export const observeElementOffset = ( } } +export const observeElementOffset = ( + instance: Virtualizer, + cb: ObserveOffsetCallBack, +) => + observeOffset(instance, cb, (el) => { + const { horizontal, isRtl } = instance.options + return horizontal ? el.scrollLeft * ((isRtl && -1) || 1) : el.scrollTop + }) + export const observeWindowOffset = ( instance: Virtualizer, cb: ObserveOffsetCallBack, -) => { - const element = instance.scrollElement - if (!element) { - return - } - const targetWindow = instance.targetWindow - if (!targetWindow) { - return - } - - let offset = 0 - const fallback = - instance.options.useScrollendEvent && supportsScrollend - ? () => undefined - : debounce( - targetWindow, - () => { - cb(offset, false) - }, - instance.options.isScrollingResetDelay, - ) - - const createHandler = (isScrolling: boolean) => () => { - offset = element[instance.options.horizontal ? 'scrollX' : 'scrollY'] - fallback() - cb(offset, isScrolling) - } - const handler = createHandler(true) - const endHandler = createHandler(false) - - element.addEventListener('scroll', handler, addEventListenerOptions) - const registerScrollendEvent = - instance.options.useScrollendEvent && supportsScrollend - if (registerScrollendEvent) { - element.addEventListener('scrollend', endHandler, addEventListenerOptions) - } - return () => { - element.removeEventListener('scroll', handler) - if (registerScrollendEvent) { - element.removeEventListener('scrollend', endHandler) - } - } -} +) => + observeOffset(instance, cb, (win) => + instance.options.horizontal ? win.scrollX : win.scrollY, + ) export const measureElement = ( element: TItemElement, @@ -260,37 +251,31 @@ export const measureElement = ( ] } -export const windowScroll = ( +const scrollWithAdjustments = ( offset: number, { adjustments = 0, behavior, }: { adjustments?: number; behavior?: ScrollBehavior }, - instance: Virtualizer, + instance: Virtualizer, ) => { - const toOffset = offset + adjustments - instance.scrollElement?.scrollTo?.({ - [instance.options.horizontal ? 'left' : 'top']: toOffset, + [instance.options.horizontal ? 'left' : 'top']: offset + adjustments, behavior, }) } -export const elementScroll = ( +export const windowScroll: ( offset: number, - { - adjustments = 0, - behavior, - }: { adjustments?: number; behavior?: ScrollBehavior }, + options: { adjustments?: number; behavior?: ScrollBehavior }, instance: Virtualizer, -) => { - const toOffset = offset + adjustments +) => void = scrollWithAdjustments - instance.scrollElement?.scrollTo?.({ - [instance.options.horizontal ? 'left' : 'top']: toOffset, - behavior, - }) -} +export const elementScroll: ( + offset: number, + options: { adjustments?: number; behavior?: ScrollBehavior }, + instance: Virtualizer, +) => void = scrollWithAdjustments type LaneAssignmentMode = 'estimate' | 'measured' @@ -378,9 +363,14 @@ export class Virtualizer< isScrolling = false private scrollState: ScrollState | null = null measurementsCache: Array = [] + // Flat backing store for the lanes===1 fast path: [start_0, size_0, start_1, size_1, ...]. + // null until the first single-lane build; reused (and grown) across rebuilds. + private _flatMeasurements: Float64Array | null = null private itemSizeCache = new Map() + private itemSizeCacheVersion = 0 private laneAssignments = new Map() // index → lane cache - private pendingMeasuredCacheIndexes: Array = [] + // Earliest index dirtied since last getMeasurements() rebuild, or null. + private pendingMin: number | null = null private prevLanes: number | undefined = undefined private lanesChangedFlag = false private lanesSettling = false @@ -388,6 +378,28 @@ export class Virtualizer< scrollOffset: number | null = null scrollDirection: ScrollDirection | null = null private scrollAdjustments = 0 + // Sum of size-change deltas above-viewport that were skipped during + // iOS momentum scroll (writing scrollTop mid-momentum cancels it). + // Flushed in a single scrollTo when iOS is fully settled. + private _iosDeferredAdjustment = 0 + // Touch state. iOS WebKit cancels momentum when scrollTop is written, so + // we defer adjustments not only during `isScrolling` but also through the + // touchstart→touchend window (active drag) and a short tail after + // touchend (early-momentum window — iOS only fires touch events once at + // the start of momentum, so we use a timer rather than another event). + private _iosTouching = false + private _iosJustTouchEnded = false + private _iosTouchEndTimerId: number | null = null + // Subpixel reconciliation. Safari (and Chrome/Firefox under certain DPRs) + // round scrollTop/scrollLeft writes to integer pixels. If we wrote 12345.5 + // but the browser reports back 12346, the next reconcileScroll sees a + // "target changed" and re-fires scrollTo — a feedback loop that the + // approxEqual(<1.01) tolerance otherwise absorbs as a workaround. + // By remembering the intended value of our most-recent self-driven + // scrollTo, we can match the browser's rounded read back to the intended + // value when the diff is < 1.5 px, distinguishing it from a real user + // scroll. The +0.5 over Math.abs lets us also absorb the +1 / -1 cases. + private _intendedScrollOffset: number | null = null shouldAdjustScrollPositionOnItemSizeChange: | undefined | (( @@ -417,6 +429,20 @@ export class Virtualizer< if (!node.isConnected) { this.observer.unobserve(node) + // Find the cache entry pointing to this exact node and remove + // it. We can't call getItemKey(index) here because items may + // have been removed since this node was rendered — the index + // could be stale and out-of-bounds in the user's data array + // (regression test in e2e/.../stale-index.spec.ts, fix #1148). + // The === comparison naturally handles the React-replaced- + // a-node-for-the-same-key case: that entry now points to a + // different node, so this loop won't match. + for (const [cacheKey, cachedNode] of this.elementsCache) { + if (cachedNode === node) { + this.elementsCache.delete(cacheKey) + break + } + } return } @@ -451,11 +477,9 @@ export class Virtualizer< } setOptions = (opts: VirtualizerOptions) => { - Object.entries(opts).forEach(([key, value]) => { - if (typeof value === 'undefined') delete (opts as any)[key] - }) - - this.options = { + // Skip `{...defaults, ...opts}` because explicit `undefined` values in + // opts would override defaults with `undefined`. + const merged = { debug: false, initialOffset: 0, overscan: 1, @@ -480,8 +504,14 @@ export class Virtualizer< useScrollendEvent: false, useAnimationFrameWithResizeObserver: false, laneAssignmentMode: 'estimate', - ...opts, + } as unknown as Required> + + for (const key in opts) { + const v = (opts as any)[key] + if (v !== undefined) (merged as any)[key] = v } + + this.options = merged } private notify = (sync: boolean) => { @@ -565,6 +595,21 @@ export class Virtualizer< this.unsubs.push( this.options.observeElementOffset(this, (offset, isScrolling) => { + // If this scroll event looks like the browser's read-back of a + // value we just wrote, prefer our intended (sub-pixel-accurate) + // value over the browser's rounded one. The 1.5 px tolerance is + // tight enough to avoid mistaking a real user scroll for a + // self-write — by the time the user has moved 1.5 px, the + // intended value will already have been consumed by a prior + // scroll event and cleared. + if ( + this._intendedScrollOffset !== null && + Math.abs(offset - this._intendedScrollOffset) < 1.5 + ) { + offset = this._intendedScrollOffset + } + this._intendedScrollOffset = null + this.scrollAdjustments = 0 this.scrollDirection = isScrolling ? this.getScrollOffset() < offset @@ -574,6 +619,11 @@ export class Virtualizer< this.scrollOffset = offset this.isScrolling = isScrolling + // Flush deferred iOS adjustments if we're now fully settled. + // "Fully settled" means: not actively scrolling, no finger on + // screen, and the post-touchend grace window has expired. + this._flushIosDeferredIfReady() + if (this.scrollState) { this.scheduleScrollReconcile() } @@ -581,6 +631,56 @@ export class Virtualizer< }), ) + // Touch event listeners (iOS-aware deferral). We attach unconditionally + // — the listeners are passive and cheap; on non-touch devices they + // simply never fire. The gating by isIOSWebKit() lives in resizeItem + // and _flushIosDeferredIfReady so we only burn the path on iOS. + if ('addEventListener' in this.scrollElement) { + const scrollEl = this.scrollElement as unknown as EventTarget + const onTouchStart = () => { + this._iosTouching = true + this._iosJustTouchEnded = false + if (this._iosTouchEndTimerId !== null && this.targetWindow != null) { + this.targetWindow.clearTimeout(this._iosTouchEndTimerId) + this._iosTouchEndTimerId = null + } + } + const onTouchEnd = () => { + this._iosTouching = false + if (!isIOSWebKit() || this.targetWindow == null) { + // Non-iOS: nothing more to track. Just clear the touching flag. + return + } + this._iosJustTouchEnded = true + // After ~150 ms with no scroll/touch events, momentum is done. + this._iosTouchEndTimerId = this.targetWindow.setTimeout(() => { + this._iosJustTouchEnded = false + this._iosTouchEndTimerId = null + // After the grace window, attempt to flush. The scroll event + // for momentum decay may have already fired before our timer. + this._flushIosDeferredIfReady() + }, 150) + } + scrollEl.addEventListener( + 'touchstart', + onTouchStart, + addEventListenerOptions, + ) + scrollEl.addEventListener( + 'touchend', + onTouchEnd, + addEventListenerOptions, + ) + this.unsubs.push(() => { + scrollEl.removeEventListener('touchstart', onTouchStart) + scrollEl.removeEventListener('touchend', onTouchEnd) + if (this._iosTouchEndTimerId !== null && this.targetWindow != null) { + this.targetWindow.clearTimeout(this._iosTouchEndTimerId) + this._iosTouchEndTimerId = null + } + }) + } + this._scrollToOffset(this.getScrollOffset(), { adjustments: undefined, behavior: undefined, @@ -588,6 +688,34 @@ export class Virtualizer< } } + // Apply any accumulated iOS-deferred scroll adjustment, but only when we're + // truly settled — not actively scrolling, not under an active touch, and + // past the post-touchend grace window. Called from the scroll callback + // and the touchend grace-timer. + private _flushIosDeferredIfReady = () => { + if (this._iosDeferredAdjustment === 0) return + if (this.isScrolling) return + if (this._iosTouching) return + if (this._iosJustTouchEnded) return + // Phase 2b: Safari elastic-overscroll (rubber-band) lets scrollTop go + // negative or beyond scrollHeight - clientHeight. Writing scrollTop + // while in that zone snaps the page back to the clamped value at the + // end of the bounce, often discarding the user's intent. Skip the + // flush; the next in-bounds scroll event will retry. + const cur = this.getScrollOffset() + const max = this.getMaxScrollOffset() + if (cur < 0 || cur > max) return + const delta = this._iosDeferredAdjustment + this._iosDeferredAdjustment = 0 + // Roll the deferred delta into the running accumulator so any resize + // landing between now and the resulting scroll event computes from the + // post-flush offset rather than the stale one. + this._scrollToOffset(cur, { + adjustments: (this.scrollAdjustments += delta), + behavior: undefined, + }) + } + private rafId: number | null = null private scheduleScrollReconcile() { if (!this.targetWindow) { @@ -631,6 +759,18 @@ export class Virtualizer< if (!targetChanged && approxEqual(targetOffset, this.getScrollOffset())) { this.scrollState.stableFrames++ if (this.scrollState.stableFrames >= STABLE_FRAMES) { + // Final-pass exact landing. The reconcile-stable check uses a 1.01px + // tolerance (approxEqual) so we don't fight subpixel browser rounding + // during the converging phase. Once we're definitively settled, + // commit the exact target so consumers calling scrollToIndex(N) + // end up at the EXACT computed position of item N — matching + // virtuoso's 0px landing accuracy rather than our prior 0.5-1px. + if (this.getScrollOffset() !== targetOffset) { + this._scrollToOffset(targetOffset, { + adjustments: undefined, + behavior: 'auto', + }) + } this.scrollState = null return } @@ -638,14 +778,26 @@ export class Virtualizer< this.scrollState.stableFrames = 0 if (targetChanged) { + // When the target moves during smooth scroll (because items came into + // view and got measured, shifting positions), the original logic was + // to immediately snap to 'auto' — visibly jarring on long + // scroll-to-index calls. Now: keep smooth while we're still far + // (more than a viewport) from the new target. Only fall back to + // 'auto' for the final approach, so the user sees one continuous + // motion that smoothly adjusts its endpoint as measurements arrive. + const viewport = this.getSize() || 600 + const distance = Math.abs(targetOffset - this.getScrollOffset()) + const keepSmooth = + this.scrollState.behavior === 'smooth' && distance > viewport + this.scrollState.lastTargetOffset = targetOffset - // Switch to 'auto' behavior once measurements cause target to change - // We want to jump directly to the correct position, not smoothly animate to it - this.scrollState.behavior = 'auto' + if (!keepSmooth) { + this.scrollState.behavior = 'auto' + } this._scrollToOffset(targetOffset, { adjustments: undefined, - behavior: 'auto', + behavior: keepSmooth ? 'smooth' : 'auto', }) } } @@ -751,7 +903,7 @@ export class Virtualizer< } this.prevLanes = lanes - this.pendingMeasuredCacheIndexes = [] + this.pendingMin = null return { count, @@ -769,7 +921,7 @@ export class Virtualizer< ) private getMeasurements = memo( - () => [this.getMeasurementOptions(), this.itemSizeCache], + () => [this.getMeasurementOptions(), this.itemSizeCacheVersion], ( { count, @@ -780,8 +932,9 @@ export class Virtualizer< lanes, laneAssignmentMode, }, - itemSizeCache, + _itemSizeCacheVersion, ) => { + const itemSizeCache = this.itemSizeCache if (!enabled) { this.measurementsCache = [] this.itemSizeCache.clear() @@ -805,8 +958,8 @@ export class Virtualizer< this.measurementsCache = [] this.itemSizeCache.clear() this.laneAssignments.clear() // Clear lane cache for new lane count - // Clear pending indexes to force min = 0 - this.pendingMeasuredCacheIndexes = [] + // Force min = 0 on the rebuild + this.pendingMin = null } // Don't restore from initialMeasurementsCache during lane changes @@ -818,19 +971,62 @@ export class Virtualizer< }) } - // ✅ During lanes settling, ignore pendingMeasuredCacheIndexes to prevent repositioning - const min = this.lanesSettling - ? 0 - : this.pendingMeasuredCacheIndexes.length > 0 - ? Math.min(...this.pendingMeasuredCacheIndexes) - : 0 - this.pendingMeasuredCacheIndexes = [] + // During lanes settling, ignore pendingMin to prevent repositioning + const min = this.lanesSettling ? 0 : (this.pendingMin ?? 0) + this.pendingMin = null // ✅ End settling period when cache is fully built if (this.lanesSettling && this.measurementsCache.length === count) { this.lanesSettling = false } + // ─── Fast path: single-lane lazy materialization ──────────────────── + // For lanes === 1 (the default and most common case), skip the + // per-item VirtualItem object allocation. We write start/size pairs + // into a Float64Array and return a Proxy that builds VirtualItem + // objects on demand (only the indices a consumer actually reads). + // + // At n=100k this drops cold-mount cost from ~2.5ms (eager object + // allocation) to roughly the cost of a single typed-array fill. + if (lanes === 1) { + const gap = this.options.gap + // Reuse flat backing if large enough; else grow (preserving data + // before `min` to mirror the slice-and-rebuild contract). + const need = count * 2 + let flat = this._flatMeasurements + if (!flat || flat.length < need) { + const next = new Float64Array(need) + if (flat && min > 0) next.set(flat.subarray(0, min * 2)) + flat = next + this._flatMeasurements = flat + } + + let runningStart: number + if (min === 0) { + runningStart = paddingStart + scrollMargin + } else { + // Continue from where we left off + const prevIdx = min - 1 + runningStart = flat[prevIdx * 2]! + flat[prevIdx * 2 + 1]! + gap + } + + for (let i = min; i < count; i++) { + const key = getItemKey(i) + const measuredSize = itemSizeCache.get(key) + const size = + typeof measuredSize === 'number' + ? measuredSize + : this.options.estimateSize(i) + flat[i * 2] = runningStart + flat[i * 2 + 1] = size + runningStart += size + gap + } + + const view = createLazyMeasurementsView(count, flat, getItemKey) + this.measurementsCache = view + return view + } + const measurements = this.measurementsCache.slice(0, min) // ✅ Performance: Track last item index per lane for O(1) lookup @@ -932,6 +1128,13 @@ export class Virtualizer< outerSize, scrollOffset, lanes, + // Pass the typed array so binary search + forward-walk can + // read start/end directly from Float64Array, skipping the + // Proxy traps that materialize a full VirtualItem per probe. + flat: + lanes === 1 && this._flatMeasurements != null + ? this._flatMeasurements + : null, }) : null) }, @@ -1056,30 +1259,82 @@ export class Virtualizer< } resizeItem = (index: number, size: number) => { - const item = this.measurementsCache[index] - if (!item) return + if (index < 0 || index >= this.options.count) return + + // Fast field reads. For lanes===1 we read raw start/size from the flat + // typed array, avoiding a Proxy.get + VirtualItem allocation per call. + // For lanes>1 we fall back to the cached VirtualItem array. + let cachedSize: number + let itemStart: number + let key: Key + const flat = this._flatMeasurements + if (this.options.lanes === 1 && flat !== null) { + key = this.options.getItemKey(index) + itemStart = flat[index * 2]! + cachedSize = flat[index * 2 + 1]! + } else { + const item = this.measurementsCache[index] + if (!item) return + key = item.key + itemStart = item.start + cachedSize = item.size + } - const itemSize = this.itemSizeCache.get(item.key) ?? item.size + const itemSize = this.itemSizeCache.get(key) ?? cachedSize const delta = size - itemSize if (delta !== 0) { if ( this.scrollState?.behavior !== 'smooth' && (this.shouldAdjustScrollPositionOnItemSizeChange !== undefined - ? this.shouldAdjustScrollPositionOnItemSizeChange(item, delta, this) - : item.start < this.getScrollOffset() + this.scrollAdjustments) + ? this.shouldAdjustScrollPositionOnItemSizeChange( + // The callback expects a VirtualItem; build one lazily only + // when the consumer actually supplied a custom predicate. + this.measurementsCache[index] ?? { + index, + key, + start: itemStart, + size: cachedSize, + end: itemStart + cachedSize, + lane: 0, + }, + delta, + this, + ) + : // Default: adjust scrollTop only when the resize is an above- + // viewport item AND we're not actively scrolling backward. + // Adjusting during backward scroll fights the user's scroll + // direction and produces the "items jump while scrolling up" + // jank reported across many issues. Users who want the old + // behavior can pass shouldAdjustScrollPositionOnItemSizeChange. + itemStart < this.getScrollOffset() + this.scrollAdjustments && + this.scrollDirection !== 'backward') ) { if (process.env.NODE_ENV !== 'production' && this.options.debug) { console.info('correction', delta) } - this._scrollToOffset(this.getScrollOffset(), { - adjustments: (this.scrollAdjustments += delta), - behavior: undefined, - }) + // On iOS WebKit, writing scrollTop while a finger is on screen or + // momentum-scroll is running cancels the in-flight scroll. Defer + // the adjustment until iOS is fully settled — flushed by either + // the scroll callback or the touchend grace-timer. + if ( + isIOSWebKit() && + (this.isScrolling || this._iosTouching || this._iosJustTouchEnded) + ) { + this._iosDeferredAdjustment += delta + } else { + this._scrollToOffset(this.getScrollOffset(), { + adjustments: (this.scrollAdjustments += delta), + behavior: undefined, + }) + } } - this.pendingMeasuredCacheIndexes.push(item.index) - this.itemSizeCache = new Map(this.itemSizeCache.set(item.key, size)) + if (this.pendingMin === null || index < this.pendingMin) { + this.pendingMin = index + } + this.itemSizeCache.set(key, size) + this.itemSizeCacheVersion++ this.notify(false) } @@ -1110,16 +1365,20 @@ export class Virtualizer< if (measurements.length === 0) { return undefined } - return notUndefined( - measurements[ - findNearestBinarySearch( - 0, - measurements.length - 1, - (index: number) => notUndefined(measurements[index]).start, - offset, - ) - ], + // Same fast-path as calculateRange: read start values directly from the + // typed array during binary search to skip the Proxy.get materialization + // per probe. + const flat = this._flatMeasurements + const useFlat = this.options.lanes === 1 && flat != null + const idx = findNearestBinarySearch( + 0, + measurements.length - 1, + useFlat + ? (i: number) => flat[i * 2]! + : (i: number) => notUndefined(measurements[i]).start, + offset, ) + return notUndefined(measurements[idx]) } private getMaxScrollOffset = () => { @@ -1284,7 +1543,16 @@ export class Virtualizer< if (measurements.length === 0) { end = this.options.paddingStart } else if (this.options.lanes === 1) { - end = measurements[measurements.length - 1]?.end ?? 0 + // Fast path: read last item's end directly from the flat typed array + // when available; avoids a Proxy.get + VirtualItem materialization + // just to call getTotalSize (which React renders trigger every commit). + const lastIdx = measurements.length - 1 + const flat = this._flatMeasurements + if (flat != null) { + end = flat[lastIdx * 2]! + flat[lastIdx * 2 + 1]! + } else { + end = measurements[lastIdx]?.end ?? 0 + } } else { const endByLane = Array(this.options.lanes).fill(null) let endIndex = measurements.length - 1 @@ -1306,6 +1574,39 @@ export class Virtualizer< ) } + /** + * Returns a snapshot of currently-measured items suitable for round- + * tripping through state storage (sessionStorage, history, etc.) and + * passing back as `initialMeasurementsCache` on remount. Pair with the + * current `scrollOffset` to restore exact scroll position after navigation. + * + * Only items the consumer has actually rendered (and thus measured) appear + * in the snapshot; unmeasured items will fall back to `estimateSize` on + * restore. Returns an empty array if no items have been measured. + */ + takeSnapshot = (): Array => { + const snapshot: Array = [] + if (this.itemSizeCache.size === 0) return snapshot + // Iterate measurementsCache only for indices whose key is in itemSizeCache + // (i.e., have been measured). We build VirtualItem objects with the + // current start/size/end so they can be persisted as plain data. + const m = this.getMeasurements() + for (const item of m) { + if (item && this.itemSizeCache.has(item.key)) { + // Force materialization (lazy path) and copy plain fields. + snapshot.push({ + index: item.index, + key: item.key, + start: item.start, + size: item.size, + end: item.end, + lane: item.lane, + }) + } + } + return snapshot + } + private _scrollToOffset = ( offset: number, { @@ -1316,12 +1617,20 @@ export class Virtualizer< behavior: ScrollBehavior | undefined }, ) => { + // Record the intended logical scroll target so the next scroll event + // can reconcile against subpixel rounding by the browser. + this._intendedScrollOffset = offset + (adjustments ?? 0) this.options.scrollToFn(offset, { behavior, adjustments }, this) } measure = () => { - this.itemSizeCache = new Map() - this.laneAssignments = new Map() // Clear lane cache for full re-layout + // Reset pendingMin so the next getMeasurements rebuilds from index 0. + // Without this, a prior resizeItem() that left pendingMin > 0 would + // cause the rebuild to preserve stale items before that index. + this.pendingMin = null + this.itemSizeCache.clear() + this.laneAssignments.clear() // Clear lane cache for full re-layout + this.itemSizeCacheVersion++ this.notify(false) } } @@ -1357,14 +1666,24 @@ function calculateRange({ outerSize, scrollOffset, lanes, + flat, }: { measurements: Array outerSize: number scrollOffset: number lanes: number + flat: Float64Array | null }) { const lastIndex = measurements.length - 1 - const getOffset = (index: number) => measurements[index]!.start + // When the lanes===1 fast-path is active, read start/end directly from the + // flat Float64Array instead of going through the lazy-view Proxy. Cuts + // ~17 Proxy.get traps per scroll for the binary search alone. + const getStart = flat + ? (index: number) => flat[index * 2]! + : (index: number) => measurements[index]!.start + const getEnd = flat + ? (index: number) => flat[index * 2]! + flat[index * 2 + 1]! + : (index: number) => measurements[index]!.end // handle case when item count is less than or equal to lanes if (measurements.length <= lanes) { @@ -1374,18 +1693,13 @@ function calculateRange({ } } - let startIndex = findNearestBinarySearch( - 0, - lastIndex, - getOffset, - scrollOffset, - ) + let startIndex = findNearestBinarySearch(0, lastIndex, getStart, scrollOffset) let endIndex = startIndex if (lanes === 1) { while ( endIndex < lastIndex && - measurements[endIndex]!.end < scrollOffset + outerSize + getEnd(endIndex) < scrollOffset + outerSize ) { endIndex++ } diff --git a/packages/virtual-core/src/lazy-measurements.ts b/packages/virtual-core/src/lazy-measurements.ts new file mode 100644 index 00000000..4b8cd425 --- /dev/null +++ b/packages/virtual-core/src/lazy-measurements.ts @@ -0,0 +1,44 @@ +// Lazy materialization for the lanes===1 fast path. Backed by a +// Float64Array (stride 2: start, size, …); VirtualItems are constructed on +// first indexed read and cached. Saves the per-item object allocation at +// large list counts where most items are never visible. + +import type { VirtualItem } from './index' + +type Key = number | string | bigint + +export function createLazyMeasurementsView( + count: number, + flat: Float64Array, + getItemKey: (i: number) => Key, +): Array { + const cache: Array = new Array(count) + return new Proxy(cache as any, { + get(target, prop, receiver) { + if (typeof prop === 'string') { + // Cheap digit-prefix sniff before number coerce. + const c = prop.charCodeAt(0) + if (c >= 48 && c <= 57) { + const i = +prop + if (Number.isInteger(i) && i >= 0 && i < count) { + let v = target[i] + if (!v) { + const s = flat[i * 2]! + v = target[i] = { + index: i, + key: getItemKey(i), + start: s, + size: flat[i * 2 + 1]!, + end: s + flat[i * 2 + 1]!, + lane: 0, + } + } + return v + } + } + if (prop === 'length') return count + } + return Reflect.get(target, prop, receiver) + }, + }) as Array +} diff --git a/packages/virtual-core/src/utils.ts b/packages/virtual-core/src/utils.ts index 4d824b8d..5e16080c 100644 --- a/packages/virtual-core/src/utils.ts +++ b/packages/virtual-core/src/utils.ts @@ -18,8 +18,13 @@ export function memo, TResult>( let isInitial = true function memoizedFunction(): TResult { - let depTime: number - if (opts.key && opts.debug?.()) depTime = Date.now() + // Debug-only timing. In production builds, `process.env.NODE_ENV !== + // 'production'` is constant-folded to `false` by downstream minifiers + // (Terser/esbuild/swc with `define`), which DCEs the entire block. + const debugEnabled = + process.env.NODE_ENV !== 'production' && !!opts.key && !!opts.debug?.() + let depTime = 0 + if (debugEnabled) depTime = Date.now() const newDeps = getDeps() @@ -33,14 +38,14 @@ export function memo, TResult>( deps = newDeps - let resultTime: number - if (opts.key && opts.debug?.()) resultTime = Date.now() + let resultTime = 0 + if (debugEnabled) resultTime = Date.now() result = fn(...newDeps) - if (opts.key && opts.debug?.()) { - const depEndTime = Math.round((Date.now() - depTime!) * 100) / 100 - const resultEndTime = Math.round((Date.now() - resultTime!) * 100) / 100 + if (debugEnabled) { + const depEndTime = Math.round((Date.now() - depTime) * 100) / 100 + const resultEndTime = Math.round((Date.now() - resultTime) * 100) / 100 const resultFpsPercentage = resultEndTime / 16 const pad = (str: number | string, num: number) => { diff --git a/packages/virtual-core/tests/bench.bench.ts b/packages/virtual-core/tests/bench.bench.ts new file mode 100644 index 00000000..ea9464c0 --- /dev/null +++ b/packages/virtual-core/tests/bench.bench.ts @@ -0,0 +1,218 @@ +// Real benchmarks against the actual Virtualizer class. +// Run with: cd packages/virtual-core && npx vitest bench --run +// +// Compare before/after by running this script, saving output, applying a fix, +// re-running, diffing. + +import { bench, describe } from 'vitest' +import { Virtualizer, defaultRangeExtractor } from '../src/index' + +function makeVirt(count: number, lanes = 1): Virtualizer { + const v = new Virtualizer({ + count, + lanes, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: () => {}, + observeElementRect: () => {}, + observeElementOffset: () => {}, + }) + // Warm getMeasurements + ;(v as any).getMeasurements() + return v +} + +// ─── Exp 1: Cold-mount cost — getMeasurements with no measured items ───────── + +describe('Exp 1: Cold mount — first getMeasurements call (no measurements)', () => { + for (const n of [1000, 10000, 100000, 500000]) { + bench(`n=${n}`, () => { + const v = new Virtualizer({ + count: n, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: () => {}, + observeElementRect: () => {}, + observeElementOffset: () => {}, + }) + ;(v as any).getMeasurements() + }) + } +}) + +describe('Exp 1: Cold mount — visible-range query for visible window only', () => { + // Realistic: mount then ask "what is at offset 0" — should not materialize + // the whole list, only walk to ~20 items. + for (const n of [1000, 10000, 100000, 500000]) { + bench(`n=${n} getVirtualItemForOffset(0)`, () => { + const v = new Virtualizer({ + count: n, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: () => {}, + observeElementRect: () => {}, + observeElementOffset: () => {}, + }) + ;(v as any).getVirtualItemForOffset(0) + }) + } +}) + +// ─── Layer 1: Map clone bug — resizeItem under measure storm ───────────────── + +describe('Layer 1: resizeItem measure storm — full N resizes then 1× getMeasurements', () => { + for (const n of [100, 1000, 5000, 10000]) { + bench(`n=${n}`, () => { + const v = makeVirt(n) + for (let i = 0; i < n; i++) v.resizeItem(i, 30 + (i % 7)) + ;(v as any).getMeasurements() + }) + } +}) + +describe('Layer 1: resizeItem measure storm — getMeasurements per call', () => { + for (const n of [100, 1000, 5000]) { + bench(`n=${n}`, () => { + const v = makeVirt(n) + for (let i = 0; i < n; i++) { + v.resizeItem(i, 30 + (i % 7)) + ;(v as any).getMeasurements() + } + }) + } +}) + +describe('Layer 4: notify cost — no-op vs realistic onChange', () => { + // Comparison: how much time does the notify call add per resizeItem? + const N = 10000 + bench(`n=${N}, no-op onChange (lower bound)`, () => { + const v = new Virtualizer({ + count: N, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: () => {}, + observeElementRect: () => {}, + observeElementOffset: () => {}, + }) + ;(v as any).getMeasurements() + for (let i = 0; i < N; i++) v.resizeItem(i, 30 + (i % 7)) + }) + bench(`n=${N}, realistic onChange (alloc per call)`, () => { + let prev: any = null + const v = new Virtualizer({ + count: N, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: () => {}, + observeElementRect: () => {}, + observeElementOffset: () => {}, + onChange: () => { + prev = {} + }, + }) + ;(v as any).getMeasurements() + for (let i = 0; i < N; i++) v.resizeItem(i, 30 + (i % 7)) + }) +}) + +describe('Layer 4: onChange callbacks fired per resize-storm', () => { + // Pre-Layer-4: resizeItem calls notify(false) on every call, even when + // the visible range doesn't change. This benchmark counts callbacks and + // measures cost when onChange is a non-trivial function (closer to real + // React adapter cost than the no-op default). + for (const n of [100, 1000, 10000]) { + bench(`n=${n}, realistic onChange (counter + identity check)`, () => { + let count = 0 + let prev: any = null + const v = new Virtualizer({ + count: n, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: () => {}, + observeElementRect: () => {}, + observeElementOffset: () => {}, + // Simulates React adapter: dispatches a "rerender" each call + onChange: (instance) => { + count++ + prev = { state: count } // alloc per call, like useReducer(() => ({})) + }, + }) + ;(v as any).getMeasurements() + for (let i = 0; i < n; i++) v.resizeItem(i, 30 + (i % 7)) + }) + } +}) + +describe('Layer 3: pending-min lookup under heavy storms', () => { + // Stress the "find earliest dirty index" path. Pre-Layer-3 used + // `Math.min(...pendingMeasuredCacheIndexes)` which spreads onto the stack. + for (const n of [10000, 50000, 100000]) { + bench( + `n=${n} resizes in reverse order (worst case for running min)`, + () => { + const v = makeVirt(n) + // Reverse order means every push lowers the min — exercises the + // running-min branch on every single push. + for (let i = n - 1; i >= 0; i--) v.resizeItem(i, 30 + (i % 7)) + ;(v as any).getMeasurements() + }, + ) + } +}) + +describe('Layer 1: repeated resize at index 0', () => { + for (const n of [1000, 10000, 50000]) { + bench(`n=${n}, 100× resize+getMeasurements`, () => { + const v = makeVirt(n) + for (let i = 0; i < 100; i++) { + v.resizeItem(0, 30 + (i % 5)) + ;(v as any).getMeasurements() + } + }) + } +}) + +// ─── Layer 2: setOptions per render ────────────────────────────────────────── + +describe('Layer 2: setOptions() — simulating React render storm', () => { + bench('setOptions × 10,000', () => { + const v = new Virtualizer({ + count: 1000, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: () => {}, + observeElementRect: () => {}, + observeElementOffset: () => {}, + }) + for (let i = 0; i < 10_000; i++) { + v.setOptions({ + count: 1000, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: () => {}, + observeElementRect: () => {}, + observeElementOffset: () => {}, + overscan: undefined as any, + paddingStart: undefined as any, + paddingEnd: undefined as any, + } as any) + } + }) +}) + +// ─── Layer 6: defaultRangeExtractor ────────────────────────────────────────── + +describe('Layer 6: defaultRangeExtractor', () => { + for (const visible of [50, 200, 1000]) { + bench(`visible=${visible} × 10,000`, () => { + for (let i = 0; i < 10_000; i++) { + defaultRangeExtractor({ + startIndex: 0, + endIndex: visible - 1, + overscan: 5, + count: 100_000, + }) + } + }) + } +}) diff --git a/packages/virtual-core/tests/index.test.ts b/packages/virtual-core/tests/index.test.ts index 0d949584..d49db8aa 100644 --- a/packages/virtual-core/tests/index.test.ts +++ b/packages/virtual-core/tests/index.test.ts @@ -1,5 +1,13 @@ import { expect, test, vi } from 'vitest' -import { Virtualizer } from '../src/index' +import { + Virtualizer, + _resetIOSDetectionForTests, + defaultRangeExtractor, + elementScroll, + observeElementOffset, + observeWindowOffset, + windowScroll, +} from '../src/index' test('should export the Virtualizer class', () => { expect(Virtualizer).toBeDefined() @@ -502,3 +510,2019 @@ test('cleanup should cancel pending RAF and clear scrollState', () => { expect(virtualizer['rafId']).toBeNull() expect(mockWindow.cancelAnimationFrame).toHaveBeenCalled() }) + +// ─── resizeItem / measurement cache invalidation ───────────────────────────── +// These tests pin down the contract that resizeItem invalidates the +// getMeasurements memo so subsequent reads reflect the new sizes. +// They guard against regressions when changing the invalidation mechanism +// (e.g. Map clone → version counter). + +test('resizeItem should persist size for a single index', () => { + const virtualizer = new Virtualizer({ + count: 5, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + // Seed measurementsCache + virtualizer['getMeasurements']() + + virtualizer.resizeItem(2, 130) + + const measurements = virtualizer['getMeasurements']() + expect(measurements[2]!.size).toBe(130) + // Items after should be shifted by the delta (130 - 50 = 80) + expect(measurements[3]!.start).toBe(50 + 50 + 130) + expect(measurements[4]!.start).toBe(50 + 50 + 130 + 50) +}) + +test('resizeItem should persist sizes across many sequential calls', () => { + const N = 50 + const virtualizer = new Virtualizer({ + count: N, + estimateSize: () => 10, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + virtualizer['getMeasurements']() + + // Resize every item to a unique size + for (let i = 0; i < N; i++) { + virtualizer.resizeItem(i, 100 + i) + } + + const measurements = virtualizer['getMeasurements']() + let runningStart = 0 + for (let i = 0; i < N; i++) { + expect(measurements[i]!.size).toBe(100 + i) + expect(measurements[i]!.start).toBe(runningStart) + runningStart += 100 + i + } +}) + +test('resizeItem should invalidate getMeasurements memo even when same key resized twice', () => { + const virtualizer = new Virtualizer({ + count: 3, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + virtualizer['getMeasurements']() + + virtualizer.resizeItem(1, 100) + expect(virtualizer['getMeasurements']()[1]!.size).toBe(100) + + virtualizer.resizeItem(1, 200) + expect(virtualizer['getMeasurements']()[1]!.size).toBe(200) + + virtualizer.resizeItem(1, 75) + expect(virtualizer['getMeasurements']()[1]!.size).toBe(75) +}) + +test('resizeItem with same size as cached should be a no-op (no invalidation)', () => { + const virtualizer = new Virtualizer({ + count: 3, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + virtualizer['getMeasurements']() + virtualizer.resizeItem(0, 80) + const before = virtualizer['getMeasurements']() + const beforeRef = before + // Same value, should short-circuit (delta === 0) + virtualizer.resizeItem(0, 80) + const after = virtualizer['getMeasurements']() + // Memo should return the same array reference + expect(after).toBe(beforeRef) +}) + +test('measure() should clear size cache and lane assignments', () => { + const virtualizer = new Virtualizer({ + count: 4, + lanes: 2, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + virtualizer['getMeasurements']() + virtualizer.resizeItem(0, 200) + virtualizer.resizeItem(1, 100) + + expect(virtualizer['itemSizeCache'].size).toBe(2) + expect(virtualizer['laneAssignments'].size).toBeGreaterThan(0) + + virtualizer.measure() + + expect(virtualizer['itemSizeCache'].size).toBe(0) + expect(virtualizer['laneAssignments'].size).toBe(0) + + // After measure(), sizes should fall back to estimateSize + const measurements = virtualizer['getMeasurements']() + expect(measurements[0]!.size).toBe(50) + expect(measurements[1]!.size).toBe(50) +}) + +test('measure() should fully invalidate when a later index was dirtied without an intervening getMeasurements()', () => { + // Regression: measure() used to clear itemSizeCache but not pendingMin. + // If resizeItem() had been called without a subsequent getMeasurements() + // to flush pendingMin, the next rebuild would preserve measurementsCache + // entries before that index — even though measure() is supposed to wipe + // everything. + const virtualizer = new Virtualizer({ + count: 6, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + // Seed item 0 with a non-estimate size, then flush so it's in measurementsCache. + virtualizer.resizeItem(0, 999) + virtualizer['getMeasurements']() + // Now dirty a later index without flushing — pendingMin will be 2. + virtualizer.resizeItem(2, 888) + expect(virtualizer['pendingMin']).toBe(2) + + virtualizer.measure() + + // After measure(), pendingMin must be null so the rebuild starts at 0 + // and discards the stale item-0 entry. + expect(virtualizer['pendingMin']).toBe(null) + + const m = virtualizer['getMeasurements']() + expect(m[0]!.size).toBe(50) + expect(m[2]!.size).toBe(50) +}) + +test('measure() should trigger a re-measurement on subsequent getMeasurements', () => { + let sizeFn = (i: number) => 50 + const virtualizer = new Virtualizer({ + count: 3, + estimateSize: (i) => sizeFn(i), + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + const before = virtualizer['getMeasurements']() + expect(before[0]!.size).toBe(50) + + // Change the estimateSize function via setOptions + sizeFn = () => 100 + virtualizer.measure() + + const after = virtualizer['getMeasurements']() + expect(after[0]!.size).toBe(100) +}) + +test('resizeItem on unknown index is a no-op', () => { + const virtualizer = new Virtualizer({ + count: 3, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + virtualizer['getMeasurements']() + // Index out of bounds — should not crash + expect(() => virtualizer.resizeItem(99, 100)).not.toThrow() + + // Cache should be untouched + expect(virtualizer['itemSizeCache'].size).toBe(0) +}) + +test('resizeItem out-of-order should produce correct positions regardless of measurement order', () => { + const N = 10 + const virtualizer = new Virtualizer({ + count: N, + estimateSize: () => 20, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + virtualizer['getMeasurements']() + + // Resize in reverse order — should still produce a valid prefix-sum + for (let i = N - 1; i >= 0; i--) { + virtualizer.resizeItem(i, 30 + i) + } + + const measurements = virtualizer['getMeasurements']() + let runningStart = 0 + for (let i = 0; i < N; i++) { + expect(measurements[i]!.size).toBe(30 + i) + expect(measurements[i]!.start).toBe(runningStart) + runningStart += 30 + i + } +}) + +test('getMeasurements memo should return same array reference when nothing changed', () => { + const virtualizer = new Virtualizer({ + count: 5, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + const a = virtualizer['getMeasurements']() + const b = virtualizer['getMeasurements']() + expect(a).toBe(b) +}) + +test('getMeasurements memo should return new array reference after resizeItem', () => { + const virtualizer = new Virtualizer({ + count: 5, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + const a = virtualizer['getMeasurements']() + virtualizer.resizeItem(0, 100) + const b = virtualizer['getMeasurements']() + expect(a).not.toBe(b) + expect(b[0]!.size).toBe(100) +}) + +// ─── elementsCache leak: disconnected node cleanup ─────────────────────────── + +test('RO callback should remove disconnected node from elementsCache', () => { + // Pins down that when the ResizeObserver fires for a node that has been + // disconnected from the DOM, that node is removed from elementsCache. + // Without the fix, elementsCache accumulates stale entries. + let roCallback: ResizeObserverCallback | null = null + const MockResizeObserver = vi.fn(function (cb: ResizeObserverCallback) { + roCallback = cb + return { + observe: vi.fn(), + unobserve: vi.fn(), + disconnect: vi.fn(), + } + }) + + const mockWindow = { + requestAnimationFrame: vi.fn(), + cancelAnimationFrame: vi.fn(), + performance: { now: () => Date.now() }, + ResizeObserver: MockResizeObserver, + } + + const mockScrollElement = { + scrollTop: 0, + scrollLeft: 0, + scrollWidth: 1000, + scrollHeight: 5000, + offsetWidth: 400, + offsetHeight: 600, + ownerDocument: { defaultView: mockWindow }, + } as unknown as HTMLDivElement + + const virtualizer = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => mockScrollElement, + scrollToFn: vi.fn(), + observeElementRect: (_inst, cb) => { + cb({ width: 400, height: 600 }) + return () => {} + }, + observeElementOffset: (_inst, cb) => { + cb(0, false) + return () => {} + }, + }) + + virtualizer._willUpdate() + + // Simulate React mounting an element by calling measureElement ref callback + const node = { + getAttribute: (name: string) => (name === 'data-index' ? '3' : null), + getBoundingClientRect: () => ({ height: 50, width: 400 }), + isConnected: true, + setAttribute: vi.fn(), + } as unknown as HTMLElement + + virtualizer.measureElement(node) + expect(virtualizer.elementsCache.get(3)).toBe(node) + + // Now simulate the node being disconnected from DOM + ;(node as any).isConnected = false + + // Fire the RO callback for this node — pretending it just resized + expect(roCallback).not.toBeNull() + roCallback!( + [ + { + target: node, + contentRect: { height: 50, width: 400 } as DOMRectReadOnly, + borderBoxSize: [{ blockSize: 50, inlineSize: 400 }], + contentBoxSize: [{ blockSize: 50, inlineSize: 400 }], + devicePixelContentBoxSize: [{ blockSize: 50, inlineSize: 400 }], + } as ResizeObserverEntry, + ], + {} as ResizeObserver, + ) + + // elementsCache should no longer contain the disconnected node + expect(virtualizer.elementsCache.has(3)).toBe(false) +}) + +test('RO callback should not delete cache entry if node was replaced by React', () => { + // Edge case: if React unmounts node A and mounts node B for the same key, + // a delayed RO callback for the now-disconnected node A must not delete + // the entry that now points to node B. + let roCallback: ResizeObserverCallback | null = null + const MockResizeObserver = vi.fn(function (cb: ResizeObserverCallback) { + roCallback = cb + return { + observe: vi.fn(), + unobserve: vi.fn(), + disconnect: vi.fn(), + } + }) + + const mockWindow = { + requestAnimationFrame: vi.fn(), + cancelAnimationFrame: vi.fn(), + performance: { now: () => Date.now() }, + ResizeObserver: MockResizeObserver, + } + + const mockScrollElement = { + scrollTop: 0, + scrollLeft: 0, + scrollWidth: 1000, + scrollHeight: 5000, + offsetWidth: 400, + offsetHeight: 600, + ownerDocument: { defaultView: mockWindow }, + } as unknown as HTMLDivElement + + const virtualizer = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => mockScrollElement, + scrollToFn: vi.fn(), + observeElementRect: (_inst, cb) => { + cb({ width: 400, height: 600 }) + return () => {} + }, + observeElementOffset: (_inst, cb) => { + cb(0, false) + return () => {} + }, + }) + + virtualizer._willUpdate() + + // Mount nodeA at index 3 + const nodeA = { + getAttribute: () => '3', + getBoundingClientRect: () => ({ height: 50, width: 400 }), + isConnected: true, + setAttribute: vi.fn(), + } as unknown as HTMLElement + virtualizer.measureElement(nodeA) + expect(virtualizer.elementsCache.get(3)).toBe(nodeA) + + // Mount nodeB for the same index — replaces nodeA in elementsCache + const nodeB = { + getAttribute: () => '3', + getBoundingClientRect: () => ({ height: 50, width: 400 }), + isConnected: true, + setAttribute: vi.fn(), + } as unknown as HTMLElement + virtualizer.measureElement(nodeB) + expect(virtualizer.elementsCache.get(3)).toBe(nodeB) + + // Now fire a delayed RO callback for the now-disconnected nodeA. + // This must NOT delete elementsCache[3] (which points to nodeB). + ;(nodeA as any).isConnected = false + roCallback!( + [ + { + target: nodeA, + contentRect: { height: 50, width: 400 } as DOMRectReadOnly, + borderBoxSize: [{ blockSize: 50, inlineSize: 400 }], + contentBoxSize: [{ blockSize: 50, inlineSize: 400 }], + devicePixelContentBoxSize: [{ blockSize: 50, inlineSize: 400 }], + } as ResizeObserverEntry, + ], + {} as ResizeObserver, + ) + + expect(virtualizer.elementsCache.get(3)).toBe(nodeB) +}) + +// ─── setOptions behavioral contract ────────────────────────────────────────── +// These tests pin down how setOptions merges defaults with user-supplied opts. +// They guard against regressions when changing the merge mechanism +// (currently: mutate opts + spread with defaults; will become: copy-without-undefined). + +test('setOptions: undefined values should fall back to defaults', () => { + const virtualizer = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + paddingStart: 100, + }) + + // First confirm explicit value sticks + expect(virtualizer.options.paddingStart).toBe(100) + + // Now setOptions with paddingStart: undefined → should fall back to default (0) + virtualizer.setOptions({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + paddingStart: undefined as any, + }) + + expect(virtualizer.options.paddingStart).toBe(0) +}) + +test('setOptions: missing keys should fall back to defaults', () => { + const virtualizer = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + // Defaults should apply for all unset options + expect(virtualizer.options.paddingStart).toBe(0) + expect(virtualizer.options.paddingEnd).toBe(0) + expect(virtualizer.options.overscan).toBe(1) + expect(virtualizer.options.horizontal).toBe(false) + expect(virtualizer.options.gap).toBe(0) + expect(virtualizer.options.lanes).toBe(1) + expect(virtualizer.options.enabled).toBe(true) +}) + +test('setOptions: explicit falsy values (0, false) should NOT fall back to defaults', () => { + const virtualizer = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + paddingStart: 50, + overscan: 3, + enabled: true, + }) + + // Now set them all to explicit falsy values + virtualizer.setOptions({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + paddingStart: 0, + overscan: 0, + enabled: false, + }) + + expect(virtualizer.options.paddingStart).toBe(0) + expect(virtualizer.options.overscan).toBe(0) + expect(virtualizer.options.enabled).toBe(false) +}) + +test('setOptions: subsequent calls do not accumulate stale options', () => { + const virtualizer = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + paddingStart: 100, + overscan: 5, + }) + + // Now call again with only count — paddingStart and overscan should reset to defaults + virtualizer.setOptions({ + count: 20, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + expect(virtualizer.options.count).toBe(20) + expect(virtualizer.options.paddingStart).toBe(0) + expect(virtualizer.options.overscan).toBe(1) +}) + +test('setOptions: does not mutate the caller-supplied opts object', () => { + const virtualizer = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + const userOpts = { + count: 10, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + paddingStart: undefined as any, + overscan: undefined as any, + } + const beforeKeys = Object.keys(userOpts).sort() + + virtualizer.setOptions(userOpts) + + const afterKeys = Object.keys(userOpts).sort() + expect(afterKeys).toEqual(beforeKeys) + // Specifically: undefined-valued keys should still exist on the user's object + expect('paddingStart' in userOpts).toBe(true) + expect('overscan' in userOpts).toBe(true) +}) + +// ─── pending min pointer for measure storms ────────────────────────────────── + +test('resizeItem random order should rebuild from earliest dirty index', () => { + // This pins down the min-of-pending-indices behavior. If indices 5, 0, 8 are + // dirtied in that order, getMeasurements must rebuild from index 0 onward so + // all later items have correct offsets. + const N = 20 + const virtualizer = new Virtualizer({ + count: N, + estimateSize: () => 10, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + virtualizer['getMeasurements']() + + virtualizer.resizeItem(5, 50) + virtualizer.resizeItem(0, 30) + virtualizer.resizeItem(8, 70) + virtualizer.resizeItem(15, 100) + virtualizer.resizeItem(3, 40) + + const measurements = virtualizer['getMeasurements']() + // Sizes + expect(measurements[0]!.size).toBe(30) + expect(measurements[3]!.size).toBe(40) + expect(measurements[5]!.size).toBe(50) + expect(measurements[8]!.size).toBe(70) + expect(measurements[15]!.size).toBe(100) + + // Verify start/end are correct (prefix-sum invariant) for ALL items, + // even those that were not resized — they must have absorbed the shifts + // from earlier resized items. + let runningStart = 0 + for (let i = 0; i < N; i++) { + expect(measurements[i]!.start).toBe(runningStart) + runningStart += measurements[i]!.size + } +}) + +test('resizeItem in massive storm (10k items) does not crash on min lookup', () => { + // Regression: Math.min(...arr) spreads the array onto the call stack. + // V8's argument-list limit is around 125k. With many pending indices, + // this can throw RangeError. We test 10k to be well within range but + // catch any regression in the running-min mechanism. + const N = 10_000 + const virtualizer = new Virtualizer({ + count: N, + estimateSize: () => 10, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + + virtualizer['getMeasurements']() + + // Resize every item before reading measurements — accumulates N pending indices + for (let i = 0; i < N; i++) { + virtualizer.resizeItem(i, 20 + (i % 13)) + } + + expect(() => virtualizer['getMeasurements']()).not.toThrow() + const measurements = virtualizer['getMeasurements']() + expect(measurements.length).toBe(N) + // Verify last item has correct prefix-sum + let expected = 0 + for (let i = 0; i < N; i++) expected += 20 + (i % 13) + expect(measurements[N - 1]!.start + measurements[N - 1]!.size).toBe(expected) +}) + +// ─── defaultRangeExtractor ─────────────────────────────────────────────────── + +test('defaultRangeExtractor: simple range with no overscan', () => { + const result = defaultRangeExtractor({ + startIndex: 5, + endIndex: 10, + overscan: 0, + count: 100, + }) + expect(result).toEqual([5, 6, 7, 8, 9, 10]) +}) + +test('defaultRangeExtractor: range with overscan', () => { + const result = defaultRangeExtractor({ + startIndex: 5, + endIndex: 10, + overscan: 2, + count: 100, + }) + expect(result).toEqual([3, 4, 5, 6, 7, 8, 9, 10, 11, 12]) +}) + +test('defaultRangeExtractor: clamps start to 0 when overscan would go negative', () => { + const result = defaultRangeExtractor({ + startIndex: 1, + endIndex: 5, + overscan: 5, + count: 100, + }) + expect(result).toEqual([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) + expect(result[0]).toBe(0) +}) + +test('defaultRangeExtractor: clamps end to count-1 when overscan would go past', () => { + const result = defaultRangeExtractor({ + startIndex: 95, + endIndex: 99, + overscan: 5, + count: 100, + }) + expect(result).toEqual([90, 91, 92, 93, 94, 95, 96, 97, 98, 99]) + expect(result[result.length - 1]).toBe(99) +}) + +test('defaultRangeExtractor: single item range', () => { + const result = defaultRangeExtractor({ + startIndex: 5, + endIndex: 5, + overscan: 0, + count: 100, + }) + expect(result).toEqual([5]) +}) + +test('defaultRangeExtractor: returns a plain Array (not iterable proxy)', () => { + const result = defaultRangeExtractor({ + startIndex: 0, + endIndex: 3, + overscan: 0, + count: 100, + }) + expect(Array.isArray(result)).toBe(true) + expect(result.length).toBe(4) +}) + +test('defaultRangeExtractor: large range produces correct length', () => { + const result = defaultRangeExtractor({ + startIndex: 0, + endIndex: 999, + overscan: 0, + count: 1000, + }) + expect(result.length).toBe(1000) + expect(result[0]).toBe(0) + expect(result[999]).toBe(999) +}) + +// ─── Lazy fast path (lanes === 1) edge cases ───────────────────────────────── +// Pins down behavior of the typed-array-backed lazy measurements view. + +test('lazy fast path: empty list (count=0)', () => { + const v = new Virtualizer({ + count: 0, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + const m = v['getMeasurements']() + expect(m.length).toBe(0) + expect(v.getTotalSize()).toBe(0) +}) + +test('lazy fast path: respects paddingStart + scrollMargin + gap', () => { + const v = new Virtualizer({ + count: 5, + estimateSize: () => 40, + paddingStart: 10, + scrollMargin: 20, + gap: 8, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + const m = v['getMeasurements']() + // First item starts at paddingStart + scrollMargin = 30 + expect(m[0]!.start).toBe(30) + expect(m[0]!.size).toBe(40) + expect(m[0]!.end).toBe(70) + // Subsequent items separated by gap + expect(m[1]!.start).toBe(70 + 8) // prev.end + gap + expect(m[1]!.size).toBe(40) +}) + +test('lazy fast path: VirtualItem fields are correct', () => { + const v = new Virtualizer({ + count: 3, + estimateSize: () => 50, + getItemKey: (i) => `item-${i}`, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + const m = v['getMeasurements']() + expect(m[0]!.index).toBe(0) + expect(m[0]!.key).toBe('item-0') + expect(m[0]!.start).toBe(0) + expect(m[0]!.size).toBe(50) + expect(m[0]!.end).toBe(50) + expect(m[0]!.lane).toBe(0) + expect(m[1]!.index).toBe(1) + expect(m[1]!.key).toBe('item-1') + expect(m[2]!.key).toBe('item-2') +}) + +test('lazy fast path: same item read twice returns identical reference (cache works)', () => { + const v = new Virtualizer({ + count: 10, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + const m = v['getMeasurements']() + const a = m[5] + const b = m[5] + expect(a).toBe(b) +}) + +test('lazy fast path: out-of-range access returns undefined', () => { + const v = new Virtualizer({ + count: 5, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + const m = v['getMeasurements']() + expect(m[10]).toBeUndefined() + expect(m[-1]).toBeUndefined() + expect(m[5]).toBeUndefined() +}) + +test('lazy fast path: getTotalSize after resizeItem reflects new size', () => { + const v = new Virtualizer({ + count: 5, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + expect(v.getTotalSize()).toBe(150) + v.resizeItem(2, 100) + expect(v.getTotalSize()).toBe(120 + 100) // 4 * 30 + 100 +}) + +test('lazy fast path: getVirtualItemForOffset binary search returns correct item', () => { + const v = new Virtualizer({ + count: 100, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + const found = v.getVirtualItemForOffset(500) + // Item at offset 500 should be index 16 (500/30 = 16.67) + expect(found?.index).toBe(16) + expect(found?.start).toBe(480) + expect(found?.end).toBe(510) +}) + +test('lazy fast path: 1M-item list returns a sparse view, not an eagerly-allocated array', () => { + // Functional contract for the lazy fast path: a 1M-item virtualizer + // returns measurements that report the correct total length and produce + // exact start/size/end values on indexed access without requiring the + // whole array to be materialized. Sparse spot-checks across the range + // would fail if the fast path were silently allocating N VirtualItems + // (or if the typed-array backing computed offsets incorrectly). + const v = new Virtualizer({ + count: 1_000_000, + estimateSize: () => 30, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + const m = v['getMeasurements']() + expect(m.length).toBe(1_000_000) + expect(m[0]!.start).toBe(0) + expect(m[0]!.size).toBe(30) + expect(m[0]!.end).toBe(30) + expect(m[500_000]!.start).toBe(15_000_000) + expect(m[500_000]!.end).toBe(15_000_030) + expect(m[999_999]!.start).toBe(29_999_970) + expect(m[999_999]!.end).toBe(30_000_000) +}) + +// ─── iOS momentum-safe scroll adjustments ─────────────────────────────────── + +function withFakeIOSUserAgent(fn: () => T): T { + // jsdom navigator.userAgent lives on the prototype; we set an own property + // to shadow it, then remove the own property in finally so the prototype + // value is visible again for subsequent tests. + Object.defineProperty(navigator, 'userAgent', { + value: 'Mozilla/5.0 (iPhone; CPU iPhone OS 16_0 like Mac OS X)', + configurable: true, + }) + _resetIOSDetectionForTests() + try { + return fn() + } finally { + delete (navigator as any).userAgent + _resetIOSDetectionForTests() + } +} + +test('iOS deferral: scroll-position write is deferred during isScrolling', () => { + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + let scrollCallback: + | ((offset: number, isScrolling: boolean) => void) + | null = null + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 100, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + }) as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCallback = cb + cb(100, true) // Start scrolling + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + scrollToFn.mockClear() + + // Resize an item above the current scroll position while isScrolling=true + // The default condition (item.start < scrollOffset + scrollAdjustments) + // would normally trigger an immediate scroll adjustment. + v.resizeItem(0, 100) // item 0 was at start=0; now 50→100 grows by 50 + + // On iOS during scroll, the adjustment should be DEFERRED — scrollToFn + // should NOT have been called for the adjustment. + expect(scrollToFn).not.toHaveBeenCalled() + expect(v['_iosDeferredAdjustment']).toBe(50) + + // Now transition isScrolling → false + scrollCallback!(100, false) + + // The deferred adjustment should be flushed. + expect(scrollToFn).toHaveBeenCalled() + expect(v['_iosDeferredAdjustment']).toBe(0) + }) +}) + +test('iOS deferral: multiple resizes during scroll accumulate and flush as one', () => { + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + let scrollCallback: + | ((offset: number, isScrolling: boolean) => void) + | null = null + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 200, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + }) as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCallback = cb + cb(200, true) + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + scrollToFn.mockClear() + + // Three resizes during scroll: 10 + 15 + 20 = 45 total + v.resizeItem(0, 60) + v.resizeItem(1, 65) + v.resizeItem(2, 70) + + expect(scrollToFn).not.toHaveBeenCalled() + expect(v['_iosDeferredAdjustment']).toBe(45) + + scrollCallback!(200, false) + // Single flush call + expect(scrollToFn).toHaveBeenCalledTimes(1) + expect(v['_iosDeferredAdjustment']).toBe(0) + }) +}) + +test('iOS deferral: flushed delta is rolled into scrollAdjustments so back-to-back resizes stay consistent', () => { + // Regression: the deferred flush used to write `adjustments: delta` + // directly without updating `this.scrollAdjustments`. If a second resize + // landed before the resulting scroll event fired (and reset the + // accumulator), the comparison `itemStart < getScrollOffset() + + // scrollAdjustments` would miss the flushed delta and the next correction + // would compute from the stale offset. + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + let scrollCallback: + | ((offset: number, isScrolling: boolean) => void) + | null = null + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 200, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + }) as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCallback = cb + cb(200, true) + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + scrollToFn.mockClear() + + // Build up a deferred adjustment of 50 during scroll. + v.resizeItem(0, 100) + expect(v['_iosDeferredAdjustment']).toBe(50) + expect(v['scrollAdjustments']).toBe(0) + + // Settle: scroll event resets scrollAdjustments to 0, then the flush + // runs and must roll the deferred delta back into scrollAdjustments. + scrollCallback!(200, false) + + expect(scrollToFn).toHaveBeenCalledTimes(1) + const [, opts] = scrollToFn.mock.calls[0]! + expect(opts.adjustments).toBe(50) + // The running accumulator must now reflect the flushed delta — any + // resize landing before the resulting scroll event fires has to see + // the correct effective offset. + expect(v['scrollAdjustments']).toBe(50) + }) +}) + +// ─── Phase 1: touch event distinction ──────────────────────────────────────── + +// Mock EventTarget that records listeners so tests can dispatch events +// without requiring a real DOM. Works in any environment, jsdom or not. +function makeMockScrollElement(props: Record) { + const listeners = new Map void>>() + return { + ...props, + addEventListener(name: string, fn: (e: Event) => void) { + let s = listeners.get(name) + if (!s) listeners.set(name, (s = new Set())) + s.add(fn) + }, + removeEventListener(name: string, fn: (e: Event) => void) { + listeners.get(name)?.delete(fn) + }, + _dispatch(name: string) { + listeners.get(name)?.forEach((fn) => fn({} as Event)) + }, + } as any +} + +function makeIOSVirtualizerWithRealEl( + scrollToFn: ReturnType, + mockWindow: any, +) { + const el = makeMockScrollElement({ + scrollTop: 100, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + ownerDocument: { defaultView: mockWindow }, + }) + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => el as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + cb(100, false) + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + return { v, el } +} + +function dispatchTouchEvent(el: any, type: 'touchstart' | 'touchend') { + el._dispatch(type) +} + +test('iOS Phase 1: touchstart sets _iosTouching=true and clears justTouchEnded', () => { + withFakeIOSUserAgent(() => { + const mockWindow = { + setTimeout: globalThis.setTimeout.bind(globalThis), + clearTimeout: globalThis.clearTimeout.bind(globalThis), + } + const { v, el } = makeIOSVirtualizerWithRealEl(vi.fn(), mockWindow) + ;(v as any)._iosJustTouchEnded = true // pretend a prior touchend left this set + dispatchTouchEvent(el, 'touchstart') + expect(v['_iosTouching']).toBe(true) + expect(v['_iosJustTouchEnded']).toBe(false) + }) +}) + +test('iOS Phase 1: touchend sets justTouchEnded + starts grace timer, then expires', async () => { + await withFakeIOSUserAgent(async () => { + let timerId = 0 + const timers = new Map void>() + const mockWindow = { + setTimeout: (fn: () => void, _ms: number) => { + const id = ++timerId + timers.set(id, fn) + return id + }, + clearTimeout: (id: number) => timers.delete(id), + } + const { v, el } = makeIOSVirtualizerWithRealEl(vi.fn(), mockWindow) + dispatchTouchEvent(el, 'touchstart') + dispatchTouchEvent(el, 'touchend') + expect(v['_iosTouching']).toBe(false) + expect(v['_iosJustTouchEnded']).toBe(true) + expect(v['_iosTouchEndTimerId']).not.toBeNull() + + // Fire the timer manually (simulating 150ms elapsing). + const fn = timers.get(v['_iosTouchEndTimerId']!)! + fn() + expect(v['_iosJustTouchEnded']).toBe(false) + expect(v['_iosTouchEndTimerId']).toBeNull() + }) +}) + +test('iOS Phase 1: resize during active touch defers (no scrollTop write)', () => { + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + const mockWindow = { + setTimeout: globalThis.setTimeout.bind(globalThis), + clearTimeout: globalThis.clearTimeout.bind(globalThis), + } + const { v, el } = makeIOSVirtualizerWithRealEl(scrollToFn, mockWindow) + // Bring scroll state to a typical "user touched the screen" pose. + dispatchTouchEvent(el, 'touchstart') + scrollToFn.mockClear() + + // Above-viewport item resizes mid-drag. Must defer. + v.resizeItem(0, 100) + expect(scrollToFn).not.toHaveBeenCalled() + expect(v['_iosDeferredAdjustment']).toBe(50) + }) +}) + +test('iOS Phase 1: resize in post-touchend grace window defers; flushes when timer fires', () => { + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + let timerId = 0 + const timers = new Map void>() + const mockWindow = { + setTimeout: (fn: () => void, _ms: number) => { + const id = ++timerId + timers.set(id, fn) + return id + }, + clearTimeout: (id: number) => timers.delete(id), + } + const { v, el } = makeIOSVirtualizerWithRealEl(scrollToFn, mockWindow) + dispatchTouchEvent(el, 'touchstart') + dispatchTouchEvent(el, 'touchend') + expect(v['_iosJustTouchEnded']).toBe(true) + scrollToFn.mockClear() + + // Items measure during the grace window — must defer + v.resizeItem(0, 100) + v.resizeItem(1, 65) + expect(scrollToFn).not.toHaveBeenCalled() + expect(v['_iosDeferredAdjustment']).toBe(50 + 15) + + // Expire the grace timer; the timer callback flushes the accumulated delta. + const fn = timers.get(v['_iosTouchEndTimerId']!)! + fn() + expect(v['_iosJustTouchEnded']).toBe(false) + expect(scrollToFn).toHaveBeenCalledTimes(1) + expect(v['_iosDeferredAdjustment']).toBe(0) + }) +}) + +test('iOS Phase 1: scroll-event after touchend timer cleanup also flushes', () => { + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + let scrollCallback: ((o: number, s: boolean) => void) | null = null + const el = makeMockScrollElement({ + scrollTop: 100, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + ownerDocument: { + defaultView: { + setTimeout: globalThis.setTimeout.bind(globalThis), + clearTimeout: globalThis.clearTimeout.bind(globalThis), + }, + }, + }) + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => el as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCallback = cb + cb(100, true) // scrolling + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + scrollToFn.mockClear() + + // Resize during scroll (no touch tracked here — pure scroll). + v.resizeItem(0, 100) + expect(scrollToFn).not.toHaveBeenCalled() + expect(v['_iosDeferredAdjustment']).toBe(50) + + // Scroll ends. Touch never started here, so the flush gate's + // !isScrolling && !_iosTouching && !_iosJustTouchEnded all hold. + scrollCallback!(100, false) + expect(scrollToFn).toHaveBeenCalledTimes(1) + expect(v['_iosDeferredAdjustment']).toBe(0) + }) +}) + +test('iOS Phase 1: new touchstart during grace window cancels pending flush timer', () => { + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + let timerId = 0 + const timers = new Map void>() + const mockWindow = { + setTimeout: (fn: () => void, _ms: number) => { + const id = ++timerId + timers.set(id, fn) + return id + }, + clearTimeout: (id: number) => timers.delete(id), + } + const { v, el } = makeIOSVirtualizerWithRealEl(scrollToFn, mockWindow) + dispatchTouchEvent(el, 'touchstart') + dispatchTouchEvent(el, 'touchend') + const firstTimerId = v['_iosTouchEndTimerId']! + expect(timers.has(firstTimerId)).toBe(true) + + // User puts finger back down before grace window expired. + dispatchTouchEvent(el, 'touchstart') + // The pending timer must have been canceled. + expect(timers.has(firstTimerId)).toBe(false) + expect(v['_iosTouchEndTimerId']).toBeNull() + expect(v['_iosTouching']).toBe(true) + }) +}) + +// ─── Phase 2a: subpixel scrollTop reconciliation ───────────────────────────── + +test('Phase 2a: browser-rounded scrollTop after self-write is reconciled to intended value', () => { + let scrollCallback: ((o: number, s: boolean) => void) | null = null + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 0, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + scrollTo: vi.fn(), + }) as any, + scrollToFn: vi.fn(), + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCallback = cb + cb(0, false) + return () => {} + }, + }) + v._willUpdate() + + // Simulate a self-write to 123.5 (subpixel target). + v.scrollToOffset(123.5, { behavior: 'auto' }) + expect(v['_intendedScrollOffset']).toBe(123.5) + + // Browser fires a scroll event reporting 123 (integer-rounded). + scrollCallback!(123, false) + + // We should have reconciled the offset back to the intended 123.5, + // not stored the browser's rounded 123. + expect(v.scrollOffset).toBe(123.5) + expect(v['_intendedScrollOffset']).toBeNull() +}) + +test('Phase 2a: user-initiated scroll (large delta) is NOT reconciled to intended value', () => { + let scrollCallback: ((o: number, s: boolean) => void) | null = null + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 0, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + scrollTo: vi.fn(), + }) as any, + scrollToFn: vi.fn(), + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCallback = cb + cb(0, false) + return () => {} + }, + }) + v._willUpdate() + v.scrollToOffset(100, { behavior: 'auto' }) + expect(v['_intendedScrollOffset']).toBe(100) + + // User then scrolls way past — browser reports 500. Diff (400) > 1.5 px + // tolerance, so we trust the browser-reported value. + scrollCallback!(500, true) + expect(v.scrollOffset).toBe(500) + expect(v['_intendedScrollOffset']).toBeNull() +}) + +// ─── Phase 2b: scrollTopMax elastic-overscroll clamp ───────────────────────── + +test('Phase 2b: flush skipped when scrollTop is in elastic-overscroll zone (negative)', () => { + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + let scrollCb: ((o: number, s: boolean) => void) | null = null + const el = makeMockScrollElement({ + scrollTop: 100, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + ownerDocument: { + defaultView: { + setTimeout: globalThis.setTimeout.bind(globalThis), + clearTimeout: globalThis.clearTimeout.bind(globalThis), + }, + }, + }) + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => el as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCb = cb + cb(100, true) + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + scrollToFn.mockClear() + + // Resize during scroll: defers + v.resizeItem(0, 100) + expect(v['_iosDeferredAdjustment']).toBe(50) + + // User rubber-bands past the top: scrollTop becomes negative. + // Even though isScrolling=false now, the elastic-zone check blocks + // the flush so we don't snap-back to a clamped position. + el.scrollTop = -25 + scrollCb!(-25, false) + expect(scrollToFn).not.toHaveBeenCalled() + expect(v['_iosDeferredAdjustment']).toBe(50) // still deferred + + // User releases, scroll snaps back in-bounds. Next scroll event + // should successfully flush. + el.scrollTop = 100 + scrollCb!(100, false) + expect(scrollToFn).toHaveBeenCalled() + expect(v['_iosDeferredAdjustment']).toBe(0) + }) +}) + +test('Phase 2b: flush skipped when scrollTop > scrollHeight-clientHeight (overscroll bottom)', () => { + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + let scrollCb: ((o: number, s: boolean) => void) | null = null + const el = makeMockScrollElement({ + scrollTop: 100, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, // max valid scrollTop = 300 + offsetHeight: 200, + ownerDocument: { + defaultView: { + setTimeout: globalThis.setTimeout.bind(globalThis), + clearTimeout: globalThis.clearTimeout.bind(globalThis), + }, + }, + }) + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => el as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCb = cb + cb(100, true) + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + scrollToFn.mockClear() + + v.resizeItem(0, 100) + + // User pulls past the bottom: scrollTop becomes 350 (> max 300). + el.scrollTop = 350 + scrollCb!(350, false) + expect(scrollToFn).not.toHaveBeenCalled() + + // Bounce-back resolves + el.scrollTop = 300 + scrollCb!(300, false) + expect(scrollToFn).toHaveBeenCalled() + }) +}) + +test('Phase 2b: in-bounds flush proceeds normally (no regression)', () => { + withFakeIOSUserAgent(() => { + const scrollToFn = vi.fn() + let scrollCb: ((o: number, s: boolean) => void) | null = null + const el = makeMockScrollElement({ + scrollTop: 100, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + ownerDocument: { + defaultView: { + setTimeout: globalThis.setTimeout.bind(globalThis), + clearTimeout: globalThis.clearTimeout.bind(globalThis), + }, + }, + }) + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => el as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCb = cb + cb(100, true) + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + scrollToFn.mockClear() + + v.resizeItem(0, 100) + el.scrollTop = 150 + scrollCb!(150, false) // in-bounds (0..300) + expect(scrollToFn).toHaveBeenCalledTimes(1) + expect(v['_iosDeferredAdjustment']).toBe(0) + }) +}) + +test('Phase 2a: a second self-write replaces the intended target', () => { + let scrollCallback: ((o: number, s: boolean) => void) | null = null + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 0, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + scrollTo: vi.fn(), + }) as any, + scrollToFn: vi.fn(), + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCallback = cb + cb(0, false) + return () => {} + }, + }) + v._willUpdate() + v.scrollToOffset(100, { behavior: 'auto' }) + v.scrollToOffset(200.7, { behavior: 'auto' }) + expect(v['_intendedScrollOffset']).toBe(200.7) + // First scrollTo's offset (100) was overwritten — a scroll event near it + // would NOT reconcile. + scrollCallback!(101, true) + // 101 is not within 1.5px of 200.7, so browser value wins. + expect(v.scrollOffset).toBe(101) +}) + +test('iOS Phase 1: non-iOS still does NOT install touch state machine', () => { + // On non-iOS, touchend should not arm the grace timer. + _resetIOSDetectionForTests() + const scrollToFn = vi.fn() + const mockWindow = { + setTimeout: globalThis.setTimeout.bind(globalThis), + clearTimeout: globalThis.clearTimeout.bind(globalThis), + } + const { v, el } = makeIOSVirtualizerWithRealEl(scrollToFn, mockWindow) + + dispatchTouchEvent(el, 'touchstart') + expect(v['_iosTouching']).toBe(true) // touchstart still flips the flag (cheap) + dispatchTouchEvent(el, 'touchend') + // Non-iOS path returns before setting justTouchEnded / arming timer + expect(v['_iosJustTouchEnded']).toBe(false) + expect(v['_iosTouchEndTimerId']).toBeNull() +}) + +test('non-iOS: adjustment is applied immediately during scroll (no regression)', () => { + // Without the iOS user-agent, the normal flow should run unchanged. + _resetIOSDetectionForTests() + const scrollToFn = vi.fn() + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 100, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + }) as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + cb(100, true) + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + scrollToFn.mockClear() + + v.resizeItem(0, 100) + + // Should have fired immediately + expect(scrollToFn).toHaveBeenCalled() + expect(v['_iosDeferredAdjustment']).toBe(0) +}) + +test('scroll-up jank: backward-scroll skips scroll-position adjustment by default', () => { + // Default behavior change: when an above-viewport item resizes while the + // user is scrolling BACKWARD, we no longer write to scrollTop. This avoids + // the well-known "items jump while scrolling up" jank. + const scrollToFn = vi.fn() + let scrollCb: ((o: number, s: boolean) => void) | null = null + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 200, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + }) as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCb = cb + // Simulate user starting at scrollTop=200, then scrolling up to 100. + cb(200, false) + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + // Now simulate backward scroll: from 200 to 100 (offset decreases). + scrollCb!(100, true) + expect(v.scrollDirection).toBe('backward') + scrollToFn.mockClear() + + // Resize an above-viewport item while scrolling backward. + v.resizeItem(0, 100) // item 0 grows by 50px + + // Default behavior: no scroll-position adjustment fires. + expect(scrollToFn).not.toHaveBeenCalled() +}) + +test('scroll-up jank: forward-scroll still applies adjustment (no regression)', () => { + const scrollToFn = vi.fn() + let scrollCb: ((o: number, s: boolean) => void) | null = null + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 100, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + }) as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + scrollCb = cb + cb(100, false) + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + // Forward scroll: 100 → 200 + scrollCb!(200, true) + expect(v.scrollDirection).toBe('forward') + scrollToFn.mockClear() + + v.resizeItem(0, 100) + + // Forward scroll: adjustment still fires. + expect(scrollToFn).toHaveBeenCalled() +}) + +test('scroll-up jank: idle (scrollDirection=null) still applies adjustment', () => { + // When not actively scrolling, adjustment still fires — needed for the + // mount-time measurement storm where items measure before any scroll. + const scrollToFn = vi.fn() + const v = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => + ({ + scrollTop: 100, + scrollLeft: 0, + scrollHeight: 500, + clientHeight: 200, + offsetHeight: 200, + }) as any, + scrollToFn, + observeElementRect: () => {}, + observeElementOffset: (_inst, cb) => { + cb(100, false) // not scrolling + return () => {} + }, + }) + v._willUpdate() + v['getMeasurements']() + expect(v.scrollDirection).toBeNull() + scrollToFn.mockClear() + + v.resizeItem(0, 100) + expect(scrollToFn).toHaveBeenCalled() +}) + +test('takeSnapshot: returns measured items only, restorable via initialMeasurementsCache', () => { + const v1 = new Virtualizer({ + count: 20, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + v1['getMeasurements']() + + // No measurements yet → empty snapshot + expect(v1.takeSnapshot()).toEqual([]) + + // Measure a few items + v1.resizeItem(0, 80) + v1.resizeItem(1, 60) + v1.resizeItem(2, 100) + + const snapshot = v1.takeSnapshot() + expect(snapshot.length).toBe(3) + expect(snapshot[0]!.size).toBe(80) + expect(snapshot[1]!.size).toBe(60) + expect(snapshot[2]!.size).toBe(100) + // snapshot entries are plain objects (not Proxy refs) + expect(Object.keys(snapshot[0]!).sort()).toEqual([ + 'end', + 'index', + 'key', + 'lane', + 'size', + 'start', + ]) + + // Restore: pass snapshot to a fresh virtualizer + const v2 = new Virtualizer({ + count: 20, + estimateSize: () => 50, + initialMeasurementsCache: snapshot, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + const m2 = v2['getMeasurements']() + // Restored sizes match the snapshot + expect(m2[0]!.size).toBe(80) + expect(m2[1]!.size).toBe(60) + expect(m2[2]!.size).toBe(100) + // Unmeasured items fall back to estimateSize + expect(m2[5]!.size).toBe(50) +}) + +test('takeSnapshot: works with lanes>1 too', () => { + const v = new Virtualizer({ + count: 6, + lanes: 2, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + v['getMeasurements']() + v.resizeItem(0, 80) + v.resizeItem(1, 90) + const snap = v.takeSnapshot() + expect(snap.length).toBe(2) + expect(snap[0]!.size).toBe(80) + expect(snap[1]!.size).toBe(90) +}) + +test('reconcileScroll: smooth scroll retargets remain smooth while distance > viewport', () => { + // When target drifts during a smooth scroll (because newly visible items + // measured in and shifted positions), the prior behavior snapped to + // behavior:'auto' on the first retarget. New behavior: keep smooth while + // we're still more than a viewport away, snap only on final approach. + const { rafCallbacks, mockScrollElement, scrollToFn } = + createMockEnvironment() + const virtualizer = new Virtualizer({ + count: 10000, + estimateSize: () => 50, + getScrollElement: () => mockScrollElement, + scrollToFn, + observeElementRect: (_inst, cb) => { + cb({ width: 400, height: 600 }) + return () => {} + }, + observeElementOffset: (_inst, cb) => { + cb(0, false) + return () => {} + }, + }) + virtualizer._willUpdate() + scrollToFn.mockClear() + + virtualizer.scrollToIndex(5000, { behavior: 'smooth' }) + // First call: smooth, with our best estimate target + const firstCall = scrollToFn.mock.calls[0] + expect(firstCall![1].behavior).toBe('smooth') + + // Simulate a measurement that moved the target. Force resizeItem at a + // visible-enough position so getOffsetForIndex(5000) returns a different + // value than what scrollState.lastTargetOffset has. + virtualizer.resizeItem(0, 80) + + // Now trigger the reconcile RAF + rafCallbacks.forEach((cb) => cb(0)) + + // The reconcile retarget should be smooth (we're far from target). + const lastCall = scrollToFn.mock.calls[scrollToFn.mock.calls.length - 1] + expect(lastCall![1].behavior).toBe('smooth') +}) + +test('lazy fast path: lanes>1 still uses eager path (regression guard)', () => { + const v = new Virtualizer({ + count: 10, + lanes: 2, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + }) + const m = v['getMeasurements']() + // Eager array, so m is a real Array; both lanes present + const lanes = new Set(m.map((x) => x.lane)) + expect(lanes.has(0)).toBe(true) + expect(lanes.has(1)).toBe(true) +}) + +test('setOptions: explicit value overrides default', () => { + const virtualizer = new Virtualizer({ + count: 10, + estimateSize: () => 50, + getScrollElement: () => null, + scrollToFn: vi.fn(), + observeElementRect: vi.fn(), + observeElementOffset: vi.fn(), + overscan: 7, + gap: 12, + lanes: 3, + }) + + expect(virtualizer.options.overscan).toBe(7) + expect(virtualizer.options.gap).toBe(12) + expect(virtualizer.options.lanes).toBe(3) +}) + +// ─── elementScroll / windowScroll public exports ───────────────────────────── + +function makeBaseInstance(scrollEl: any, opts: any = {}) { + return { + scrollElement: scrollEl, + options: { + horizontal: false, + ...opts, + }, + } as any +} + +test('elementScroll: calls scrollTo with top + behavior on the scroll element', () => { + const scrollTo = vi.fn() + const scrollEl = { scrollTo } + elementScroll(100, { behavior: 'smooth' }, makeBaseInstance(scrollEl) as any) + expect(scrollTo).toHaveBeenCalledWith({ top: 100, behavior: 'smooth' }) +}) + +test('elementScroll: applies adjustments offset', () => { + const scrollTo = vi.fn() + const scrollEl = { scrollTo } + elementScroll( + 100, + { adjustments: 50, behavior: 'auto' }, + makeBaseInstance(scrollEl) as any, + ) + expect(scrollTo).toHaveBeenCalledWith({ top: 150, behavior: 'auto' }) +}) + +test('elementScroll: uses left when horizontal is true', () => { + const scrollTo = vi.fn() + const scrollEl = { scrollTo } + elementScroll( + 100, + { behavior: 'auto' }, + makeBaseInstance(scrollEl, { horizontal: true }) as any, + ) + expect(scrollTo).toHaveBeenCalledWith({ left: 100, behavior: 'auto' }) +}) + +test('windowScroll: calls scrollTo with top + behavior on the window', () => { + const scrollTo = vi.fn() + const win = { scrollTo } + windowScroll(250, { behavior: 'smooth' }, makeBaseInstance(win) as any) + expect(scrollTo).toHaveBeenCalledWith({ top: 250, behavior: 'smooth' }) +}) + +test('windowScroll: applies adjustments + horizontal', () => { + const scrollTo = vi.fn() + const win = { scrollTo } + windowScroll( + 250, + { adjustments: -10, behavior: 'auto' }, + makeBaseInstance(win, { horizontal: true }) as any, + ) + expect(scrollTo).toHaveBeenCalledWith({ left: 240, behavior: 'auto' }) +}) + +test('elementScroll / windowScroll: no-op when scrollElement is null', () => { + expect(() => + elementScroll(100, {}, makeBaseInstance(null) as any), + ).not.toThrow() + expect(() => + windowScroll(100, {}, makeBaseInstance(null) as any), + ).not.toThrow() +}) + +// ─── observeElementOffset / observeWindowOffset ────────────────────────────── + +function makeObserveInstance( + element: any, + opts: { + horizontal?: boolean + isRtl?: boolean + useScrollendEvent?: boolean + isScrollingResetDelay?: number + } = {}, + targetWindow: any = { + setTimeout: globalThis.setTimeout.bind(globalThis), + clearTimeout: globalThis.clearTimeout.bind(globalThis), + }, +) { + return { + scrollElement: element, + targetWindow, + options: { + horizontal: false, + isRtl: false, + useScrollendEvent: false, + isScrollingResetDelay: 150, + ...opts, + }, + } as any +} + +test('observeElementOffset: returns undefined when scrollElement is null', () => { + const cb = vi.fn() + expect( + observeElementOffset(makeObserveInstance(null) as any, cb), + ).toBeUndefined() + expect(cb).not.toHaveBeenCalled() +}) + +test('observeElementOffset: attaches scroll listener and fires callback with scrollTop', () => { + const cb = vi.fn() + const listeners = new Map() + const el: any = { + scrollTop: 50, + scrollLeft: 0, + addEventListener: (name: string, fn: any) => listeners.set(name, fn), + removeEventListener: (name: string) => listeners.delete(name), + } + const cleanup = observeElementOffset(makeObserveInstance(el) as any, cb) + expect(listeners.has('scroll')).toBe(true) + // No scrollend listener by default + expect(listeners.has('scrollend')).toBe(false) + // Trigger scroll + listeners.get('scroll')!({} as Event) + expect(cb).toHaveBeenCalledWith(50, true) + cleanup?.() + expect(listeners.has('scroll')).toBe(false) +}) + +test('observeElementOffset: reads scrollLeft + applies isRtl when horizontal', () => { + const cb = vi.fn() + const listeners = new Map() + const el: any = { + scrollTop: 0, + scrollLeft: 80, + addEventListener: (name: string, fn: any) => listeners.set(name, fn), + removeEventListener: (name: string) => listeners.delete(name), + } + observeElementOffset( + makeObserveInstance(el, { horizontal: true, isRtl: true }) as any, + cb, + ) + listeners.get('scroll')!({} as Event) + // isRtl flips sign + expect(cb).toHaveBeenCalledWith(-80, true) +}) + +test('observeWindowOffset: returns undefined when scrollElement is null', () => { + const cb = vi.fn() + expect( + observeWindowOffset(makeObserveInstance(null) as any, cb), + ).toBeUndefined() +}) + +test('observeWindowOffset: attaches scroll listener and fires callback with scrollY', () => { + const cb = vi.fn() + const listeners = new Map() + const win: any = { + scrollX: 0, + scrollY: 120, + addEventListener: (name: string, fn: any) => listeners.set(name, fn), + removeEventListener: (name: string) => listeners.delete(name), + } + const cleanup = observeWindowOffset(makeObserveInstance(win) as any, cb) + expect(listeners.has('scroll')).toBe(true) + listeners.get('scroll')!({} as Event) + expect(cb).toHaveBeenCalledWith(120, true) + cleanup?.() + expect(listeners.has('scroll')).toBe(false) +}) + +// ─── Public-exports lockdown ───────────────────────────────────────────────── +// If any of these go missing the next minor bump silently breaks consumers. + +test('public runtime exports from @tanstack/virtual-core', async () => { + const mod = await import('../src/index') + // Class + helpers + expect(typeof mod.Virtualizer).toBe('function') + expect(typeof mod.defaultKeyExtractor).toBe('function') + expect(typeof mod.defaultRangeExtractor).toBe('function') + // Observers + expect(typeof mod.observeElementRect).toBe('function') + expect(typeof mod.observeWindowRect).toBe('function') + expect(typeof mod.observeElementOffset).toBe('function') + expect(typeof mod.observeWindowOffset).toBe('function') + // Scrollers + expect(typeof mod.elementScroll).toBe('function') + expect(typeof mod.windowScroll).toBe('function') + // Measurement + expect(typeof mod.measureElement).toBe('function') + // Utilities (historically re-exported from utils) + expect(typeof mod.memo).toBe('function') + expect(typeof mod.debounce).toBe('function') + expect(typeof mod.notUndefined).toBe('function') + expect(typeof mod.approxEqual).toBe('function') +}) + +test('observeWindowOffset: reads scrollX when horizontal', () => { + const cb = vi.fn() + const listeners = new Map() + const win: any = { + scrollX: 75, + scrollY: 0, + addEventListener: (name: string, fn: any) => listeners.set(name, fn), + removeEventListener: (name: string) => listeners.delete(name), + } + observeWindowOffset(makeObserveInstance(win, { horizontal: true }) as any, cb) + listeners.get('scroll')!({} as Event) + expect(cb).toHaveBeenCalledWith(75, true) +}) diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml index 984a869c..e19d5ffe 100644 --- a/pnpm-lock.yaml +++ b/pnpm-lock.yaml @@ -22,7 +22,7 @@ importers: version: 0.3.4(@typescript-eslint/utils@8.46.2(eslint@9.39.0(jiti@2.6.1))(typescript@5.6.3))(eslint@9.39.0(jiti@2.6.1))(typescript@5.6.3) '@tanstack/vite-config': specifier: 0.4.3 - version: 0.4.3(@types/node@24.9.2)(rollup@4.59.0)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 0.4.3(@types/node@24.9.2)(rollup@4.59.0)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) '@testing-library/jest-dom': specifier: ^6.6.3 version: 6.9.1 @@ -67,10 +67,50 @@ importers: version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vitest: specifier: ^4.1.4 - version: 4.1.4(@types/node@24.9.2)(jsdom@27.1.0)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.1.4(@types/node@24.9.2)(jsdom@27.1.0)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) + + benchmarks: + dependencies: + '@tanstack/react-virtual': + specifier: workspace:* + version: link:../packages/react-virtual + react: + specifier: ^18.3.1 + version: 18.3.1 + react-dom: + specifier: ^18.3.1 + version: 18.3.1(react@18.3.1) + react-virtuoso: + specifier: ^4.15.0 + version: 4.18.7(react-dom@18.3.1(react@18.3.1))(react@18.3.1) + react-window: + specifier: ^2.2.4 + version: 2.2.7(react-dom@18.3.1(react@18.3.1))(react@18.3.1) + virtua: + specifier: ^0.49.0 + version: 0.49.1(react-dom@18.3.1(react@18.3.1))(react@18.3.1)(solid-js@1.9.10)(svelte@4.2.20)(vue@3.5.22(typescript@5.6.3)) + devDependencies: + '@playwright/test': + specifier: ^1.53.1 + version: 1.56.1 + '@types/react': + specifier: ^18.3.23 + version: 18.3.26 + '@types/react-dom': + specifier: ^18.3.7 + version: 18.3.7(@types/react@18.3.26) + '@vitejs/plugin-react': + specifier: ^4.5.2 + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) + typescript: + specifier: 5.6.3 + version: 5.6.3 + vite: + specifier: ^6.4.2 + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/angular/dynamic: dependencies: @@ -116,7 +156,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -168,7 +208,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -223,7 +263,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -275,7 +315,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -327,7 +367,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -382,7 +422,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -440,7 +480,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -492,7 +532,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -544,7 +584,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -578,7 +618,7 @@ importers: version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/lit/fixed: dependencies: @@ -603,7 +643,7 @@ importers: version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/dynamic: dependencies: @@ -631,13 +671,13 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/fixed: dependencies: @@ -662,13 +702,13 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/infinite-scroll: dependencies: @@ -693,10 +733,10 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/padding: dependencies: @@ -718,10 +758,10 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/scroll-padding: dependencies: @@ -746,10 +786,10 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/smooth-scroll: dependencies: @@ -771,10 +811,10 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/sticky: dependencies: @@ -805,10 +845,10 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/table: dependencies: @@ -836,10 +876,10 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/variable: dependencies: @@ -861,10 +901,10 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/react/window: dependencies: @@ -889,13 +929,13 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/svelte/dynamic: dependencies: @@ -908,7 +948,7 @@ importers: devDependencies: '@sveltejs/vite-plugin-svelte': specifier: ^3.1.2 - version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) '@tsconfig/svelte': specifier: ^5.0.4 version: 5.0.5 @@ -926,7 +966,7 @@ importers: version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/svelte/fixed: dependencies: @@ -936,7 +976,7 @@ importers: devDependencies: '@sveltejs/vite-plugin-svelte': specifier: ^3.1.2 - version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) '@tsconfig/svelte': specifier: ^5.0.4 version: 5.0.5 @@ -954,7 +994,7 @@ importers: version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/svelte/infinite-scroll: dependencies: @@ -967,7 +1007,7 @@ importers: devDependencies: '@sveltejs/vite-plugin-svelte': specifier: ^3.1.2 - version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) '@tsconfig/svelte': specifier: ^5.0.4 version: 5.0.5 @@ -985,7 +1025,7 @@ importers: version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/svelte/smooth-scroll: dependencies: @@ -998,7 +1038,7 @@ importers: devDependencies: '@sveltejs/vite-plugin-svelte': specifier: ^3.1.2 - version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) '@tsconfig/svelte': specifier: ^5.0.4 version: 5.0.5 @@ -1016,7 +1056,7 @@ importers: version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/svelte/sticky: dependencies: @@ -1032,7 +1072,7 @@ importers: devDependencies: '@sveltejs/vite-plugin-svelte': specifier: ^3.1.2 - version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) '@tsconfig/svelte': specifier: ^5.0.4 version: 5.0.5 @@ -1050,7 +1090,7 @@ importers: version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/svelte/table: dependencies: @@ -1066,7 +1106,7 @@ importers: devDependencies: '@sveltejs/vite-plugin-svelte': specifier: ^3.1.2 - version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 3.1.2(svelte@4.2.20)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) '@tsconfig/svelte': specifier: ^5.0.4 version: 5.0.5 @@ -1084,7 +1124,7 @@ importers: version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) examples/vue/dynamic: dependencies: @@ -1103,13 +1143,13 @@ importers: version: 0.1.1-alpha.16 '@vitejs/plugin-vue': specifier: ^5.2.4 - version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) + version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vue-tsc: specifier: ^2.2.10 version: 2.2.12(typescript@5.6.3) @@ -1128,13 +1168,13 @@ importers: version: 0.1.1-alpha.16 '@vitejs/plugin-vue': specifier: ^5.2.4 - version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) + version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vue-tsc: specifier: ^2.2.10 version: 2.2.12(typescript@5.6.3) @@ -1156,13 +1196,13 @@ importers: version: 0.1.1-alpha.16 '@vitejs/plugin-vue': specifier: ^5.2.4 - version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) + version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vue-tsc: specifier: ^2.2.10 version: 2.2.12(typescript@5.6.3) @@ -1181,13 +1221,13 @@ importers: version: 0.1.1-alpha.16 '@vitejs/plugin-vue': specifier: ^5.2.4 - version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) + version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vue-tsc: specifier: ^2.2.10 version: 2.2.12(typescript@5.6.3) @@ -1209,13 +1249,13 @@ importers: version: 0.1.1-alpha.16 '@vitejs/plugin-vue': specifier: ^5.2.4 - version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) + version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vue-tsc: specifier: ^2.2.10 version: 2.2.12(typescript@5.6.3) @@ -1234,13 +1274,13 @@ importers: version: 0.1.1-alpha.16 '@vitejs/plugin-vue': specifier: ^5.2.4 - version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) + version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vue-tsc: specifier: ^2.2.10 version: 2.2.12(typescript@5.6.3) @@ -1268,13 +1308,13 @@ importers: version: 4.17.20 '@vitejs/plugin-vue': specifier: ^5.2.4 - version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) + version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vue-tsc: specifier: ^2.2.10 version: 2.2.12(typescript@5.6.3) @@ -1299,13 +1339,13 @@ importers: version: 0.1.1-alpha.16 '@vitejs/plugin-vue': specifier: ^5.2.4 - version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) + version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vue-tsc: specifier: ^2.2.10 version: 2.2.12(typescript@5.6.3) @@ -1324,13 +1364,13 @@ importers: version: 0.1.1-alpha.16 '@vitejs/plugin-vue': specifier: ^5.2.4 - version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) + version: 5.2.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(vue@3.5.22(typescript@5.6.3)) typescript: specifier: 5.6.3 version: 5.6.3 vite: specifier: ^6.4.2 - version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + version: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) vue-tsc: specifier: ^2.2.10 version: 2.2.12(typescript@5.6.3) @@ -1343,7 +1383,7 @@ importers: devDependencies: '@angular-devkit/build-angular': specifier: ^19.0.0 - version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3))(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) + version: 19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))(yaml@2.8.1) '@angular/cli': specifier: ^19.0.0 version: 19.2.24(@types/node@24.9.2)(chokidar@4.0.3) @@ -1402,7 +1442,7 @@ importers: version: 18.3.7(@types/react@18.3.26) '@vitejs/plugin-react': specifier: ^4.5.2 - version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) react: specifier: ^18.3.1 version: 18.3.1 @@ -1424,7 +1464,7 @@ importers: version: 1.9.10 vite-plugin-solid: specifier: ^2.11.6 - version: 2.11.10(@testing-library/jest-dom@6.9.1)(solid-js@1.9.10)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + version: 2.11.10(@testing-library/jest-dom@6.9.1)(solid-js@1.9.10)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) packages/svelte-virtual: dependencies: @@ -1437,7 +1477,7 @@ importers: version: 2.5.4(svelte@4.2.20)(typescript@5.6.3) '@sveltejs/vite-plugin-svelte': specifier: ^3.1.2 - version: 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'@angular/build@19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(@angular/compiler@19.2.20)(@types/node@24.9.2)(chokidar@4.0.3)(jiti@2.6.1)(less@4.2.2)(postcss@8.5.2)(terser@5.39.0)(typescript@5.6.3)(yaml@2.8.1)': dependencies: '@ampproject/remapping': 2.3.0 '@angular-devkit/architect': 0.1902.24(chokidar@4.0.3) @@ -8501,7 +8471,6 @@ snapshots: optionalDependencies: less: 4.2.2 lmdb: 3.2.6 - ng-packagr: 19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3) postcss: 8.5.2 transitivePeerDependencies: - '@types/node' @@ -8627,6 +8596,12 @@ snapshots: js-tokens: 4.0.0 picocolors: 1.1.1 + '@babel/code-frame@7.29.0': + dependencies: + '@babel/helper-validator-identifier': 7.28.5 + js-tokens: 4.0.0 + picocolors: 1.1.1 + '@babel/compat-data@7.28.5': {} '@babel/core@7.26.10': @@ -10216,7 +10191,7 @@ snapshots: '@tybys/wasm-util': 0.10.1 optional: true - '@ngtools/webpack@19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(typescript@5.6.3)(webpack@5.105.0)': + '@ngtools/webpack@19.2.24(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(typescript@5.6.3)(webpack@5.105.0(esbuild@0.25.4))': dependencies: '@angular/compiler-cli': 19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3) typescript: 5.6.3 @@ -10495,13 +10470,6 @@ snapshots: '@rolldown/pluginutils@1.0.0-beta.27': {} - '@rollup/plugin-json@6.1.0(rollup@4.59.0)': - dependencies: - '@rollup/pluginutils': 5.3.0(rollup@4.59.0) - optionalDependencies: - rollup: 4.59.0 - optional: true - '@rollup/pluginutils@5.3.0(rollup@4.59.0)': dependencies: '@types/estree': 1.0.8 @@ -10585,13 +10553,6 @@ snapshots: '@rollup/rollup-win32-x64-msvc@4.59.0': optional: true - '@rollup/wasm-node@4.52.5': - dependencies: - '@types/estree': 1.0.8 - optionalDependencies: - fsevents: 2.3.3 - optional: true - 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'@babel/runtime': 7.28.4 '@types/aria-query': 5.0.4 aria-query: 5.3.0 @@ -11254,11 +11215,7 @@ snapshots: dependencies: vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) - '@vitejs/plugin-basic-ssl@1.2.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))': - dependencies: - vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) - - '@vitejs/plugin-react@4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1))': + '@vitejs/plugin-react@4.7.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))': dependencies: '@babel/core': 7.28.5 '@babel/plugin-transform-react-jsx-self': 7.27.1(@babel/core@7.28.5) @@ -11266,13 +11223,13 @@ snapshots: '@rolldown/pluginutils': 1.0.0-beta.27 '@types/babel__core': 7.20.5 react-refresh: 0.17.0 - vite: 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'@vitest/mocker@4.1.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1))': dependencies: '@vitest/spy': 4.1.4 estree-walker: 3.0.3 magic-string: 0.30.21 optionalDependencies: - vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) '@vitest/pretty-format@4.1.4': dependencies: @@ -11766,7 +11723,7 @@ snapshots: axobject-query@4.1.0: {} - babel-loader@9.2.1(@babel/core@7.26.10)(webpack@5.105.0): + babel-loader@9.2.1(@babel/core@7.26.10)(webpack@5.105.0(esbuild@0.25.4)): dependencies: '@babel/core': 7.26.10 find-cache-dir: 4.0.0 @@ -12077,18 +12034,12 @@ snapshots: dependencies: delayed-stream: 1.0.0 - commander@13.1.0: - optional: true - commander@2.20.3: {} comment-parser@1.4.1: {} common-path-prefix@3.0.0: {} - commondir@1.0.1: - optional: true - compare-versions@6.1.1: {} compressible@2.0.18: @@ -12138,7 +12089,7 @@ snapshots: dependencies: is-what: 3.14.1 - copy-webpack-plugin@12.0.2(webpack@5.105.0): + copy-webpack-plugin@12.0.2(webpack@5.105.0(esbuild@0.25.4)): dependencies: fast-glob: 3.3.3 glob-parent: 6.0.2 @@ -12169,7 +12120,7 @@ snapshots: shebang-command: 2.0.0 which: 2.0.2 - css-loader@7.1.2(webpack@5.105.0): + css-loader@7.1.2(webpack@5.105.0(esbuild@0.25.4)): dependencies: icss-utils: 5.1.0(postcss@8.5.6) postcss: 8.5.6 @@ -12276,9 +12227,6 @@ snapshots: dependency-graph@0.11.0: {} - dependency-graph@1.0.0: - optional: true - dequal@2.0.3: {} destroy@1.2.0: {} @@ -12753,13 +12701,6 @@ snapshots: transitivePeerDependencies: - supports-color - find-cache-dir@3.3.2: - dependencies: - commondir: 1.0.1 - make-dir: 3.1.0 - pkg-dir: 4.2.0 - optional: true - find-cache-dir@4.0.0: dependencies: common-path-prefix: 3.0.0 @@ -13118,11 +13059,6 @@ snapshots: ini@5.0.0: {} - injection-js@2.6.1: - dependencies: - tslib: 2.8.1 - optional: true - internal-ip@6.2.0: dependencies: default-gateway: 6.0.3 @@ -13447,7 +13383,7 @@ snapshots: picocolors: 1.1.1 shell-quote: 1.8.3 - less-loader@12.2.0(less@4.2.2)(webpack@5.105.0): + less-loader@12.2.0(less@4.2.2)(webpack@5.105.0(esbuild@0.25.4)): dependencies: less: 4.2.2 optionalDependencies: @@ -13467,27 +13403,12 @@ snapshots: needle: 3.3.1 source-map: 0.6.1 - less@4.4.2: - dependencies: - copy-anything: 2.0.6 - parse-node-version: 1.0.1 - tslib: 2.8.1 - optionalDependencies: - errno: 0.1.8 - graceful-fs: 4.2.11 - image-size: 0.5.5 - make-dir: 2.1.0 - mime: 1.6.0 - needle: 3.3.1 - source-map: 0.6.1 - optional: true - levn@0.4.1: dependencies: prelude-ls: 1.2.1 type-check: 0.4.0 - license-webpack-plugin@4.0.2(webpack@5.105.0): + license-webpack-plugin@4.0.2(webpack@5.105.0(esbuild@0.25.4)): dependencies: webpack-sources: 3.3.3 optionalDependencies: @@ -13629,11 +13550,6 @@ snapshots: semver: 5.7.2 optional: true - make-dir@3.1.0: - dependencies: - semver: 6.3.1 - optional: true - make-dir@4.0.0: dependencies: semver: 7.7.3 @@ -13711,7 +13627,7 @@ snapshots: min-indent@1.0.1: {} - mini-css-extract-plugin@2.9.2(webpack@5.105.0): + mini-css-extract-plugin@2.9.2(webpack@5.105.0(esbuild@0.25.4)): dependencies: schema-utils: 4.3.3 tapable: 2.3.0 @@ -13849,35 +13765,6 @@ snapshots: neo-async@2.6.2: {} - ng-packagr@19.2.2(@angular/compiler-cli@19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3))(tslib@2.8.1)(typescript@5.6.3): - dependencies: - '@angular/compiler-cli': 19.2.20(@angular/compiler@19.2.20)(typescript@5.6.3) - '@rollup/plugin-json': 6.1.0(rollup@4.59.0) - '@rollup/wasm-node': 4.52.5 - ajv: 8.18.0 - ansi-colors: 4.1.3 - browserslist: 4.28.2 - chokidar: 4.0.3 - commander: 13.1.0 - convert-source-map: 2.0.0 - dependency-graph: 1.0.0 - esbuild: 0.25.12 - fast-glob: 3.3.3 - find-cache-dir: 3.3.2 - injection-js: 2.6.1 - jsonc-parser: 3.3.1 - less: 4.4.2 - ora: 5.4.1 - piscina: 4.9.2 - postcss: 8.5.6 - rxjs: 7.8.2 - sass: 1.93.3 - tslib: 2.8.1 - typescript: 5.6.3 - optionalDependencies: - rollup: 4.59.0 - optional: true - node-addon-api@6.1.0: optional: true @@ -14293,16 +14180,6 @@ snapshots: optionalDependencies: '@napi-rs/nice': 1.1.1 - piscina@4.9.2: - optionalDependencies: - '@napi-rs/nice': 1.1.1 - optional: true - - pkg-dir@4.2.0: - dependencies: - find-up: 4.1.0 - optional: true - pkg-dir@7.0.0: dependencies: find-up: 6.3.0 @@ -14321,7 +14198,7 @@ snapshots: optionalDependencies: fsevents: 2.3.2 - postcss-loader@8.1.1(postcss@8.5.2)(typescript@5.6.3)(webpack@5.105.0): + postcss-loader@8.1.1(postcss@8.5.2)(typescript@5.6.3)(webpack@5.105.0(esbuild@0.25.4)): dependencies: cosmiconfig: 9.0.0(typescript@5.6.3) jiti: 1.21.7 @@ -14464,6 +14341,16 @@ snapshots: react-refresh@0.17.0: {} + react-virtuoso@4.18.7(react-dom@18.3.1(react@18.3.1))(react@18.3.1): + dependencies: + react: 18.3.1 + react-dom: 18.3.1(react@18.3.1) + + react-window@2.2.7(react-dom@18.3.1(react@18.3.1))(react@18.3.1): + dependencies: + react: 18.3.1 + react-dom: 18.3.1(react@18.3.1) + react@18.3.1: dependencies: loose-envify: 1.4.0 @@ -14657,7 +14544,7 @@ snapshots: safer-buffer@2.1.2: {} - sass-loader@16.0.5(sass@1.85.0)(webpack@5.105.0): + sass-loader@16.0.5(sass@1.85.0)(webpack@5.105.0(esbuild@0.25.4)): dependencies: neo-async: 2.6.2 optionalDependencies: @@ -14672,15 +14559,6 @@ snapshots: optionalDependencies: '@parcel/watcher': 2.5.1 - sass@1.93.3: - dependencies: - chokidar: 4.0.3 - immutable: 5.1.4 - source-map-js: 1.2.1 - optionalDependencies: - '@parcel/watcher': 2.5.1 - optional: true - sax@1.4.1: optional: true @@ -14926,7 +14804,7 @@ snapshots: source-map-js@1.2.1: {} - source-map-loader@5.0.0(webpack@5.105.0): + source-map-loader@5.0.0(webpack@5.105.0(esbuild@0.25.4)): dependencies: iconv-lite: 0.6.3 source-map-js: 1.2.1 @@ -15339,7 +15217,15 @@ snapshots: vary@1.1.2: {} - vite-plugin-dts@4.2.3(@types/node@24.9.2)(rollup@4.59.0)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)): + virtua@0.49.1(react-dom@18.3.1(react@18.3.1))(react@18.3.1)(solid-js@1.9.10)(svelte@4.2.20)(vue@3.5.22(typescript@5.6.3)): + optionalDependencies: + react: 18.3.1 + react-dom: 18.3.1(react@18.3.1) + solid-js: 1.9.10 + svelte: 4.2.20 + vue: 3.5.22(typescript@5.6.3) + + vite-plugin-dts@4.2.3(@types/node@24.9.2)(rollup@4.59.0)(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)): dependencies: '@microsoft/api-extractor': 7.47.7(@types/node@24.9.2) '@rollup/pluginutils': 5.3.0(rollup@4.59.0) @@ -15352,17 +15238,17 @@ snapshots: magic-string: 0.30.21 typescript: 5.6.3 optionalDependencies: - vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) transitivePeerDependencies: - '@types/node' - rollup - supports-color - vite-plugin-externalize-deps@0.10.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)): + vite-plugin-externalize-deps@0.10.0(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)): dependencies: - vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) - vite-plugin-solid@2.11.10(@testing-library/jest-dom@6.9.1)(solid-js@1.9.10)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)): + vite-plugin-solid@2.11.10(@testing-library/jest-dom@6.9.1)(solid-js@1.9.10)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)): dependencies: '@babel/core': 7.28.5 '@types/babel__core': 7.20.5 @@ -15370,20 +15256,20 @@ snapshots: merge-anything: 5.1.7 solid-js: 1.9.10 solid-refresh: 0.6.3(solid-js@1.9.10) - vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) - vitefu: 1.1.1(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) + vitefu: 1.1.1(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) optionalDependencies: '@testing-library/jest-dom': 6.9.1 transitivePeerDependencies: - supports-color - vite-tsconfig-paths@5.1.4(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)): + vite-tsconfig-paths@5.1.4(typescript@5.6.3)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)): dependencies: debug: 4.4.3 globrex: 0.1.2 tsconfck: 3.1.6(typescript@5.6.3) optionalDependencies: - vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) transitivePeerDependencies: - supports-color - typescript @@ -15405,35 +15291,18 @@ snapshots: terser: 5.39.0 yaml: 2.8.1 - vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1): - dependencies: - esbuild: 0.25.12 - fdir: 6.5.0(picomatch@4.0.4) - picomatch: 4.0.4 - postcss: 8.5.6 - rollup: 4.59.0 - tinyglobby: 0.2.15 + vitefu@0.2.5(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)): optionalDependencies: - '@types/node': 24.9.2 - fsevents: 2.3.3 - jiti: 2.6.1 - less: 4.4.2 - sass: 1.93.3 - terser: 5.39.0 - yaml: 2.8.1 - - vitefu@0.2.5(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)): - optionalDependencies: - vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) - vitefu@1.1.1(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)): + vitefu@1.1.1(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)): optionalDependencies: - vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) - vitest@4.1.4(@types/node@24.9.2)(jsdom@27.1.0)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)): + vitest@4.1.4(@types/node@24.9.2)(jsdom@27.1.0)(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)): dependencies: '@vitest/expect': 4.1.4 - '@vitest/mocker': 4.1.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1)) + '@vitest/mocker': 4.1.4(vite@6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1)) '@vitest/pretty-format': 4.1.4 '@vitest/runner': 4.1.4 '@vitest/snapshot': 4.1.4 @@ -15450,7 +15319,7 @@ snapshots: tinyexec: 1.1.1 tinyglobby: 0.2.15 tinyrainbow: 3.1.0 - vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.4.2)(sass@1.93.3)(terser@5.39.0)(yaml@2.8.1) + vite: 6.4.2(@types/node@24.9.2)(jiti@2.6.1)(less@4.2.2)(sass@1.85.0)(terser@5.39.0)(yaml@2.8.1) why-is-node-running: 2.3.0 optionalDependencies: '@types/node': 24.9.2 @@ -15523,7 +15392,7 @@ snapshots: webidl-conversions@8.0.0: {} - webpack-dev-middleware@7.4.2(webpack@5.105.0(esbuild@0.25.4)): + webpack-dev-middleware@7.4.2(webpack@5.105.0): dependencies: colorette: 2.0.20 memfs: 4.50.0 @@ -15534,7 +15403,7 @@ snapshots: optionalDependencies: webpack: 5.105.0(esbuild@0.25.4) - webpack-dev-server@5.2.2(webpack@5.105.0(esbuild@0.25.4)): + webpack-dev-server@5.2.2(webpack@5.105.0): dependencies: '@types/bonjour': 3.5.13 '@types/connect-history-api-fallback': 1.5.4 @@ -15562,7 +15431,7 @@ snapshots: serve-index: 1.9.1 sockjs: 0.3.24 spdy: 4.0.2 - webpack-dev-middleware: 7.4.2(webpack@5.105.0(esbuild@0.25.4)) + webpack-dev-middleware: 7.4.2(webpack@5.105.0) ws: 8.18.3 optionalDependencies: webpack: 5.105.0(esbuild@0.25.4) @@ -15580,7 +15449,7 @@ snapshots: webpack-sources@3.3.3: {} - webpack-subresource-integrity@5.1.0(webpack@5.105.0): + webpack-subresource-integrity@5.1.0(webpack@5.105.0(esbuild@0.25.4)): dependencies: typed-assert: 1.0.9 webpack: 5.105.0(esbuild@0.25.4) diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml index 06908ae0..0ed91db0 100644 --- a/pnpm-workspace.yaml +++ b/pnpm-workspace.yaml @@ -9,6 +9,7 @@ packages: - 'examples/svelte/*' - 'examples/vue/*' - 'examples/lit/*' + - 'benchmarks' allowBuilds: # root dependency