fix(react): retain offscreen worklet ctx refs by Yradex · Pull Request #2592 · lynx-family/lynx-stack

Yradex · 2026-05-09T12:09:38Z

Summary by CodeRabbit

Bug Fixes
- Fixed worklet callback retention to keep event, ref, gesture, and spread handlers alive on the main thread before snapshot elements are materialized, ensuring proper attachment during DOM updates.

Overview

Main-thread worklets used by events, refs, gestures, and spread props can be recorded on snapshot values before the snapshot has concrete __elements. This happens for offscreen list items and similar deferred materialization paths.

Previously, lifecycle retaining was coupled to onWorkletCtxUpdate(), which only runs when an element is available. That meant an offscreen main-thread worklet ctx could miss the lifecycle addRef step before the later DOM attach/update path, so the background worklet ctx was allowed to be released too early.

This PR separates lifecycle retaining from element update side effects. Snapshot update paths now retain main-thread worklet ctx values as soon as they observe them, while onWorkletCtxUpdate() remains responsible only for hydration and delayed-worklet behavior that actually needs an element.

Key Points

Root cause: lifecycle addRef was behind the snapshot.__elements guard through onWorkletCtxUpdate(). Offscreen snapshots skipped that path until materialization, which was too late for retaining the background ctx reference.
Fix: introduce a minimal retainWorkletCtx(worklet) helper and call it from event, ref, gesture, and spread update paths before returning for missing __elements.
Gesture handling retains callback worklets when the snapshot value updates, then suppresses a second retain when processGesture() later performs the real DOM update for the same value.
JsFunctionLifecycleManager now deduplicates repeated addRef() calls for the same object identity, so repeated componentAtIndex access cannot inflate the ref count for the exact same retained object.

Runtime Contract

The lifecycle retain step is now independent from element-specific update work:

// Retain can happen before native elements are materialized.
if (workletType === 'main-thread') {
  retainWorkletCtx(worklet);
}

// Element-side hydration, delayed execution, and DOM binding still require elements.
if (snapshot.__elements) {
  onWorkletCtxUpdate(worklet, oldWorklet, isMainThreadHydrating, element);
}

For gestures, the retained unit is each serialized base gesture callback. The DOM update path keeps using processGesture() for detector setup, but passes retainCallbacks: false when the callbacks have already been retained by the snapshot update path.

This does not change the serialized worklet shape, native gesture detector contract, transform output, or public component API. Missing _execId remains a no-op for lifecycle retaining, and legacy first-screen hydration / delayed-worklet behavior stays in onWorkletCtxUpdate().

Compatibility / Boundaries

The dedupe is object-identity based: retaining the same object twice is ignored, while distinct objects that share an execId still contribute separate lifecycle references.
The fix is limited to main-thread worklet lifecycle retention for event, ref, gesture, and spread paths. It does not introduce debug logging, dump fields, or example-page changes.
Existing compatibility branches for old main-thread ref values and old gesture cleanup APIs are preserved.

Checklist

Tests updated (or not required).
Documentation updated (or not required).
Changeset added, and when a BREAKING CHANGE occurs, it needs to be clearly marked (or not required).

changeset-bot · 2026-05-09T12:09:42Z

🦋 Changeset detected

Latest commit: 4e36350

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@lynx-js/react	Patch
@lynx-js/react-umd	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

coderabbitai · 2026-05-09T12:09:44Z

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 06fbb8f5-22c8-4f78-9a3d-b893e8e1dc8a

📥 Commits

Reviewing files that changed from the base of the PR and between 87c1759 and 4e36350.

📒 Files selected for processing (11)

.changeset/retain-offscreen-worklet-ctx.md
packages/react/runtime/__test__/snapshot/workletLifecycle.test.ts
packages/react/runtime/__test__/worklet-runtime/jsFunctionLifecycle.test.js
packages/react/runtime/__test__/worklet-runtime/observers.test.js
packages/react/runtime/src/snapshot/gesture/processGesture.ts
packages/react/runtime/src/snapshot/snapshot/gesture.ts
packages/react/runtime/src/snapshot/snapshot/spread.ts
packages/react/runtime/src/snapshot/snapshot/workletEvent.ts
packages/react/runtime/src/snapshot/snapshot/workletRef.ts
packages/react/runtime/src/worklet-runtime/bindings/observers.ts
packages/react/runtime/src/worklet-runtime/jsFunctionLifecycle.ts

📝 Walkthrough

Walkthrough

This PR separates worklet context retention from observation in the React runtime by extracting an explicit retainWorkletCtx helper and integrating it across snapshot handlers to retain main-thread callbacks before elements are materialized, with deduplication to prevent duplicate registrations.

Changes

Worklet Context Retention for Offscreen Elements

Layer / File(s)	Summary
Deduplication and retention helper infrastructure `packages/react/runtime/src/worklet-runtime/bindings/observers.ts`, `packages/react/runtime/src/worklet-runtime/jsFunctionLifecycle.ts`	Extract `addRef` logic into a new exported `retainWorkletCtx` helper that runs when `_execId` is defined. Remove automatic `addRef` from `onWorkletCtxUpdate`, and add a `WeakSet` to track already-retained objects, preventing duplicate `addRef` calls.
Gesture worklet context retention `packages/react/runtime/src/snapshot/gesture/processGesture.ts`, `packages/react/runtime/src/snapshot/snapshot/gesture.ts`	Add `retainGestureWorkletCtx` helper to dedupe and retain gesture callbacks by traversing the serialized gesture tree. Extend `processGesture` to conditionally retain callbacks unless explicitly disabled. Update `updateGesture` to retain main-thread gesture contexts before processing.
Ref and event worklet context retention `packages/react/runtime/src/snapshot/snapshot/workletRef.ts`, `packages/react/runtime/src/snapshot/snapshot/workletEvent.ts`	Update `updateWorkletRef` signature to accept `workletType` and retain main-thread ref contexts when `_wkltId` is present. Update `updateWorkletEvent` to retain main-thread event worklets and return early when `snapshot.__elements` is absent.
Spread attribute worklet context retention `packages/react/runtime/src/snapshot/snapshot/spread.ts`	Add `retainSpreadWorkletCtx` helper to retain ref, gesture, and event worklet contexts from spread attributes. Call this in `updateSpread`'s early-return path when elements are not materialized.
Test coverage `packages/react/runtime/__test__/snapshot/workletLifecycle.test.ts`, `packages/react/runtime/__test__/worklet-runtime/jsFunctionLifecycle.test.js`, `packages/react/runtime/__test__/worklet-runtime/observers.test.js`	Add integration tests verifying retention across all snapshot handlers; add deduplication test; update observer tests to use `retainWorkletCtx` and verify `addRef` is not called during element updates.
Release notes `.changeset/retain-offscreen-worklet-ctx.md`	Document patch release for `@lynx-js/react` noting main-thread worklet context retention for offscreen elements.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

lynx-family/lynx-stack#2188: Both PRs modify main-thread gesture/worklet lifecycle and gesture processing code to avoid redundant updates and preserve worklet/gesture contexts.
lynx-family/lynx-stack#2320: Both PRs modify worklet lifecycle handling in observers.ts by guarding addRef with _execId checks.

Suggested labels

framework:React

Suggested reviewers

hzy
HuJean
colinaaa

Poem

🐰 A rabbit's ode to retention

Little worklets need a home,
Before they're off-screen left alone,
Dedupe their refs with careful grace,
Hold them tight in memory's space,
Till DOM arrives to claim its place! 🌿

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 8.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: retaining offscreen worklet context references before snapshot elements are materialized.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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codecov · 2026-05-09T12:12:25Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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codspeed-hq · 2026-05-09T12:32:45Z

Merging this PR will degrade performance by 16.04%

⚡ 1 improved benchmark
❌ 2 regressed benchmarks
✅ 78 untouched benchmarks
⏩ 26 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	`BASE`	`HEAD`	Efficiency
⚡	`002-hello-reactLynx-destroyBackground`	912.5 µs	670.3 µs	+36.13%
❌	`008-many-use-state-destroyBackground`	8 ms	9.5 ms	-16.04%
❌	`transform 1000 view elements`	40 ms	46.8 ms	-14.65%

_{Comparing Yradex:wt/run-on-background-retain-offscreen (4e36350) with main (87c1759)}

26 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

relativeci · 2026-05-09T12:34:24Z

React External

#1165 Bundle Size — 693.04KiB (+0.4%).

4e36350(current) vs 33b124f main#1143(baseline)

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relativeci · 2026-05-09T12:34:25Z

Web Explorer

#9624 Bundle Size — 900.02KiB (~-0.01%).

4e36350(current) vs 33b124f main#9602(baseline)

Bundle metrics

2 changes

	Current #9624	Baseline #9602
Initial JS	`44.46KiB`	`44.46KiB`
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Chunks	`9`	`9`
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	Current #9624	Baseline #9602
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CSS	`2.22KiB`	`2.22KiB`

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relativeci · 2026-05-09T12:34:25Z

React Example

#8051 Bundle Size — 236.51KiB (+0.32%).

4e36350(current) vs 33b124f main#8029(baseline)

Bundle metrics

2 changes

	Current #8051	Baseline #8029
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	Current #8051	Baseline #8029
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Bundle analysis report Branch Yradex:wt/run-on-background-reta... Project dashboard

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relativeci · 2026-05-09T12:34:27Z

React MTF Example

#1182 Bundle Size — 207.41KiB (+0.39%).

4e36350(current) vs 33b124f main#1160(baseline)

Bundle metrics

2 changes

	Current #1182	Baseline #1160
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Bundle size by type

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	Current #1182	Baseline #1160
IMG	`111.23KiB`	`111.23KiB`
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relativeci · 2026-05-09T12:34:30Z

React Example with Element Template

#317 Bundle Size — 197.79KiB (0%).

4e36350(current) vs 33b124f main#295(baseline)

Bundle metrics

2 changes

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This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to main, this PR will be updated. # Releases ## @lynx-js/autolink-codegen@0.1.0 ### Minor Changes - Add the Native Autolink codegen package. ([#2601](#2601)) ## create-lynx-extension@0.1.0 ### Minor Changes - Add the Native Autolink create-extension package. ([#2587](#2587)) ### Patch Changes - Use published package versions for scaffolded autolink codegen dependencies instead of workspace placeholders. ([#2628](#2628)) - Fix npm bin symlink entrypoint detection for the create extension CLI. ([#2623](#2623)) ## @lynx-js/react@0.121.0 ### Minor Changes - Support `React.createElement(type, props, children)` API. ([#2360](#2360)) ```jsx React.createElement("view", { style }, <text>hello</text>); // equivalent to <view style={style}> <text>hello</text> </view>; React.createElement(MyComponent, { style }, <view />); // equivalent to <MyComponent style={style}> <view /> </MyComponent>; ``` ### Patch Changes - Clear transient snapshot child props when removed snapshot subtrees are detached, preventing compiled `$*` child references from retaining deleted list holder or list item subtrees after removal. ([#2590](#2590)) - Add `createPortal` for rendering a subtree into a different ReactLynx element identified by a `NodesRef`. ([#2543](#2543)) ```tsx function App() { const [host, setHost] = useState(null); return ( <view> <view ref={setHost} /> {host && createPortal(<text>hi</text>, host)} </view> ); } ``` - Default `fireEvent` to `bubbles: true` for the TouchEvent family in testing-library to match Lynx runtime semantics, and stop reassigning the read-only `Event.prototype` accessors which threw `TypeError` in strict mode. ([#2532](#2532)) - Set `bundle-url` on lazy bundle border elements. ([#2537](#2537)) - Stop warning when `runWorklet` receives an invalid or missing main-thread function object. Invalid worklet contexts are still ignored, but nullish handler values no longer produce noisy `MainThreadFunction: Invalid function object` console output. ([#2586](#2586)) - Retain main-thread worklet context references before offscreen snapshot elements are materialized, so event, ref, gesture, and spread callbacks stay alive until the DOM update path can attach them. ([#2592](#2592)) - Update the @lynx-js/tasm dependency to 0.0.39 and align React template attribute descriptors with it. ([#2643](#2643)) - Avoid retaining transformed nested worklet contexts after worklet transformation. ([#2591](#2591)) Nested worklets transformed by the worklet runtime now keep their context recovery metadata through a weak reference, preventing cached transformed worklet functions from keeping list-item worklet contexts alive. ## @lynx-js/docs-mcp-server@0.2.3 ### Patch Changes - fix(docs-mcp): recursively crawl and register nested llms.txt resources ([#2317](#2317)) ## @lynx-js/rspeedy@0.14.4 ### Patch Changes - feat(qrcode): support get entry from api exposed from rspeedy.env.entries ([#2551](#2551)) - Updated dependencies \[[`ad1f90f`](ad1f90f)]: - @lynx-js/chunk-loading-webpack-plugin@0.3.4 - @lynx-js/web-rsbuild-server-middleware@0.20.4 - @lynx-js/cache-events-webpack-plugin@0.0.3 ## @lynx-js/lynx-bundle-rslib-config@0.3.3 ### Patch Changes - Update the @lynx-js/tasm dependency to 0.0.39 and align React template attribute descriptors with it. ([#2643](#2643)) ## @lynx-js/qrcode-rsbuild-plugin@0.4.7 ### Patch Changes - feat(qrcode): support get entry from api exposed from rspeedy.env.entries ([#2551](#2551)) ## @lynx-js/react-rsbuild-plugin@0.16.2 ### Patch Changes - Updated dependencies \[[`3e627b3`](3e627b3), [`7b8d63c`](7b8d63c), [`13a0776`](13a0776), [`a973c54`](a973c54), [`353b1b7`](353b1b7)]: - @lynx-js/template-webpack-plugin@0.11.1 - @lynx-js/react-refresh-webpack-plugin@0.3.6 - @lynx-js/react-alias-rsbuild-plugin@0.16.2 - @lynx-js/use-sync-external-store@1.5.0 - @lynx-js/react-webpack-plugin@0.9.2 - @lynx-js/css-extract-webpack-plugin@0.7.1 ## @lynx-js/web-core@0.20.4 ### Patch Changes - Always clone touch event lists when creating cross-thread events so synthetic touch events only carry structured-clone-safe primitive fields. ([#2636](#2636)) - Conditionally pass Card and Component params based on cardType in background thread. ([#2610](#2610)) - Add bidirectional decode worker heartbreak liveness messages. ([#2599](#2599)) - Add web support for the `<frame>` element by mapping it to `<lynx-view>`. ([#2604](#2604)) - Stop redeclaring `fetch` as a chunk-scope binding. Reusing the host ([#2562](#2562)) `window.fetch` from BTS chunks (instead of capturing the no-op stub the chunk wrapper used to install) lets the renderer issue real network requests. - Updated dependencies \[[`c1db603`](c1db603)]: - @lynx-js/web-elements@0.12.2 - @lynx-js/web-worker-rpc@0.20.4 ## @lynx-js/web-elements@0.12.2 ### Patch Changes - fix: xmarkdown create img incorrectly ([#2540](#2540)) ## @lynx-js/chunk-loading-webpack-plugin@0.3.4 ### Patch Changes - Override `__webpack_require__.e` so a single sync-then chunk load (the ([#2597](#2597)) typical lazy bundle case) bypasses `Promise.all`. It will make first screen in main thread can load lazy bundle synchronously when using dynamic import. ## @lynx-js/react-refresh-webpack-plugin@0.3.6 ### Patch Changes - Widen `@lynx-js/react-webpack-plugin` peer range to include `^0.9.0`. ([#2626](#2626)) ## @lynx-js/template-webpack-plugin@0.11.1 ### Patch Changes - feat(web): enable web binary template by default ([#2545](#2545)) The default encoding format for the web platform template has been changed from JSON to Binary. **Benefits for developers:** - **Smaller output size:** Binary templates are more compact than JSON strings, reducing the final bundle size. - **Faster load performance:** Binary templates parse faster than JSON in the runtime, improving the time-to-interactive for web applications. **How to turn off this feature:** If you encounter any issues with the new binary template format, you can revert to the previous JSON format by setting the environment variable `EXPERIMENTAL_USE_WEB_BINARY_TEMPLATE` to `'false'` or `'0'` before running your build commands. For example: `EXPERIMENTAL_USE_WEB_BINARY_TEMPLATE=false rspeedy build` **Upgrade to `@lynx-js/web-core@0.20.2` could support the new output format** See [`@lynx-js/web-core` Changelog](https://lynx-stack.dev/changelog/lynx-js--web-core) - Run TASM template encoding in a shared `tinypool` worker pool so multi-entry builds encode in parallel and watch-mode rebuilds reuse warm workers. ([#2634](#2634)) - Make `LynxTemplatePlugin.getLynxTemplatePluginHooks` a cross-module singleton so duplicate copies of this package (e.g. from npm hoist conflicts) share the same hooks per compilation. ([#2624](#2624)) - Update the @lynx-js/tasm dependency to 0.0.39 and align React template attribute descriptors with it. ([#2643](#2643)) - Updated dependencies \[[`ee79eff`](ee79eff), [`ded4de9`](ded4de9), [`cf01e94`](cf01e94), [`b989c1c`](b989c1c), [`8417e68`](8417e68)]: - @lynx-js/web-core@0.20.4 ## @lynx-js/react-umd@0.121.0 ## create-rspeedy@0.14.4 ## @lynx-js/react-alias-rsbuild-plugin@0.16.2 ## upgrade-rspeedy@0.14.4 ## @lynx-js/web-rsbuild-server-middleware@0.20.4 ## @lynx-js/web-worker-rpc@0.20.4 Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

fix(react): retain offscreen worklet ctx refs

4e36350

Yradex force-pushed the wt/run-on-background-retain-offscreen branch from 2f66ca4 to 4e36350 Compare May 9, 2026 14:07

Yradex marked this pull request as ready for review May 12, 2026 03:30

Yradex requested review from HuJean and hzy as code owners May 12, 2026 03:30

coderabbitai Bot added the framework:React label May 12, 2026

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Yradex merged commit 1e1257e into lynx-family:main May 12, 2026
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Yradex deleted the wt/run-on-background-retain-offscreen branch May 12, 2026 09:34

github-actions Bot mentioned this pull request May 12, 2026

chore: Release 2026-05-18 01:41:54 #2535

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React MTF Example

#1182 Bundle Size — 207.41KiB (+0.39%).

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React Example with Element Template

#317 Bundle Size — 197.79KiB (0%).

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Yradex commented May 9, 2026 •

edited by coderabbitai Bot

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changeset-bot Bot commented May 9, 2026 •

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relativeci Bot commented May 9, 2026 •

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relativeci Bot commented May 9, 2026 •

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