feat(react): optimize the number and depth of snapshot by hzy · Pull Request #1764 · lynx-family/lynx-stack

hzy · 2025-09-17T03:58:52Z

Summary by CodeRabbit

New Features
- Introduced SlotV2 and ListSlotV2 slot types for organizing dynamic content.
- Added support for named slots ($0, $1, etc.) for flexible content injection.
Refactor
- Enhanced snapshot serialization with slot index tracking across rendering and hydration.
- Improved list rendering architecture with slot-based updates and filtering.
- Updated transform pipeline to generate slot-aware code patterns.
Tests
- Expanded test coverage for new slot functionality and list rendering scenarios.

See preact changes at: lynx-family/internal-preact#1

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 · 2025-09-17T03:58:56Z

🦋 Changeset detected

Latest commit: afd2d6a

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

This PR includes changesets to release 4 packages

Name	Type
@lynx-js/react	Minor
@lynx-js/react-rsbuild-plugin	Patch
@lynx-js/react-umd	Minor
@lynx-js/react-alias-rsbuild-plugin	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 · 2025-09-17T03:58:59Z

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📝 Walkthrough

Walkthrough

This PR introduces slot index tracking (__slotIndex) to snapshot instances and adds new V2 slot types (SlotV2 and ListSlotV2) throughout the React runtime and transform system. The changes propagate slot indices through opcode generation, patch operations, and snapshot serialization, while updating the transform plugins to emit new dynamic part slot variants and enabling per-slot child filtering in hydration and background snapshot logic.

Changes

Cohort / File(s)	Summary
Runtime snapshot and slot types `packages/react/runtime/src/snapshot.ts`, `packages/react/runtime/src/snapshot/dynamicPartType.ts`	Added `__slotIndex` field to `SnapshotInstance` and serialization interfaces; extended `DynamicPartType` enum with `SlotV2` and `ListSlotV2` members; updated snapshot creation logic to recognize new slot types and support per-child slot indexing.
Background snapshot with slot handling `packages/react/runtime/src/backgroundSnapshot.ts`	Added `__slotIndex` field to `BackgroundSnapshotInstance`; implemented per-slot child filtering in hydration paths for `SlotV2` and `ListSlotV2` types; updated `InsertBefore` patch emissions to include slot index; added error handling for unexpected slot types.
Hydration and patch application `packages/react/runtime/src/hydrate.ts`, `packages/react/runtime/src/lifecycle/patch/snapshotPatch.ts`, `packages/react/runtime/src/lifecycle/patch/snapshotPatchApply.ts`	Extended `InsertBefore` patch parameters to include `slotIndex`; implemented per-slot child node filtering for `SlotV2` and `ListSlotV2` in hydration; updated patch structure definitions and application to read and assign slot index from patch stream.
Opcode generation with slot index `packages/react/runtime/src/opcodes.ts`, `packages/react/runtime/src/renderToOpcodes/index.ts`	Modified opcode generation to track and propagate `__slotIndex` from opcodes stream; updated `_renderToString` to emit slot index with `Begin` and `Text` operations; added support for named children via `$0`-prefixed props; refactored child rendering logic to use slot-aware indexing.
Document creation and slot index `packages/react/runtime/src/document.ts`, `packages/react/testing-library/src/vitest-global-setup.js`	Added optional `slotIndex` parameter to `createElement`, `createElementNS`, and `createTextNode`; attached slot index to created instances via `__slotIndex` property during initialization.
Runtime internal exports `packages/react/runtime/src/internal.ts`, `packages/react/runtime/lazy/internal.js`	Introduced three new public exports: `__DynamicPartSlotV2`, `__DynamicPartListSlotV2`, and `__DynamicPartSlotV2_0` to expose V2 slot functionality to external consumers.
Suspense slot-based children `packages/react/runtime/src/lynx/suspense.ts`	Updated Suspense implementation to pass children and fallback via `$0` property instead of direct children, aligning with new slot-based content injection pattern.
Runtime test snapshots — basic and lifecycle `packages/react/runtime/__test__/basic.test.jsx`, `packages/react/runtime/__test__/lifecycle.test.jsx`, `packages/react/runtime/__test__/lifecycle/reload.test.jsx`, `packages/react/runtime/__test__/delayed-lifecycle-events.test.jsx`	Updated inline snapshot expectations to include `__slotIndex` metadata on snapshot instances and adjusted snapshot patch arrays to reflect new opcode structure with slot index entries.
Runtime test snapshots — hydration and patch `packages/react/runtime/__test__/hydrate.test.jsx`, `packages/react/runtime/__test__/snapshotPatch.test.jsx`, `packages/react/runtime/__test__/renderToOpcodes.test.jsx`	Updated hydrate result arrays and patch structures to include additional entries for slot index; adjusted opcode sequences and vnode access patterns to use `$0` slot-based property syntax.
Runtime test snapshots — dynamic parts `packages/react/runtime/__test__/snapshot/dynamicPartType.test.jsx`	Added comprehensive new test suite covering `DynamicPartType.Slot`, `DynamicPartType.SlotV2`, `DynamicPartType.ListSlotV2`, and `DynamicPartType.Children` with foreground/background hydration assertions.
Runtime test snapshots — debug and events `packages/react/runtime/__test__/debug/formatPatch.test.ts`, `packages/react/runtime/__test__/snapshot/event.test.jsx`, `packages/react/runtime/__test__/snapshot/ref.test.jsx`, `packages/react/runtime/__test__/lynx/...`	Updated snapshot patch formatting, event hydration, and Lynx-specific test expectations to include `__slotIndex` and adjusted patch array structures.
Testing library test snapshots — general `packages/react/testing-library/src/__tests__/act.test.jsx`, `packages/react/testing-library/src/__tests__/alog.test.jsx`, `packages/react/testing-library/src/__tests__/end-to-end.test.jsx`, `packages/react/testing-library/src/__tests__/lynx.test.jsx`	Updated inline snapshot expectations to include `__slotIndex` metadata in serialized structures and adjusted patch data to reflect new slot-aware operation formats.
Testing library test snapshots — component rendering `packages/react/testing-library/src/__tests__/render.test.jsx`, `packages/react/testing-library/src/__tests__/renderComponent.test.jsx`, `packages/react/testing-library/src/__tests__/setState-jsx.test.jsx`	Restructured expected rendered output to reflect wrapper/slot-based layout changes; added new test file validating state-driven updates with slot index assertions.
Testing library test snapshots — list rendering `packages/react/testing-library/src/__tests__/list.test.jsx`, `packages/react/testing-library/src/__tests__/lazy-bundle/index.test.jsx`	Updated list-item structure to remove nested wrappers; adjusted element IDs and snapshot references to reflect slot-based rendering; modified wrapper placement relative to content elements.
Transform plugin snapshot generation `packages/react/transform/crates/swc_plugin_snapshot/lib.rs`, `packages/react/transform/crates/swc_plugin_snapshot/slot_marker.rs`	Replaced `DynamicPart::Children` and `DynamicPart::ListChildren` with `DynamicPart::Slot(Expr, i32)` and `DynamicPart::ListSlot(Expr, i32)`; removed `dynamic_part_count` from `DynamicPartExtractor`; removed entire `slot_marker.rs` module; implemented dynamic-part merging and slot-based JSX transformation.
Transform plugin snapshots — slots and children `packages/react/transform/crates/swc_plugin_snapshot/tests/__swc_snapshots__/lib.rs/*`	Updated snapshot generation to emit `__DynamicPartSlotV2` and `__DynamicPartListSlotV2` instead of legacy dynamic part types; replaced children element syntax with `$0`/`$1` prop-based slot injection; restructured snapshot markup accordingly.
Transform plugin list handling `packages/react/transform/crates/swc_plugin_list/lib.rs`, `packages/react/transform/crates/swc_plugin_list/tests/__swc_snapshots__/lib.rs/*`	Added list transformation logic to detect and wrap list elements; updated import of `jsx_helpers`; introduced list-wrapping visitor; expanded test snapshots for list-in-view scenarios with multiple static-sibling and nested configurations.
Transform snapshot fixtures `packages/react/transform/crates/swc_plugin_snapshot/tests/__swc_snapshots__/slot_marker.rs/*`	Removed test data files for deleted `slot_marker.rs` module (should_not_wrap_dynamic_part.js, should_wrap_dynamic_part.js).
Webpack react-refresh and documentation `packages/webpack/react-refresh-webpack-plugin/test/hotCases/jsx/value/index.jsx`, `.github/react-transform.instructions.md`	Updated JSX value test to normalize dynamic children into `$0` props; added GitHub workflow instructions for updating transform snapshot fixtures.
Debug utilities `packages/react/runtime/__test__/utils/debug.js`	Updated `backgroundSnapshotInstanceToJSON` to include `__slotIndex` in serialized output.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Possibly related PRs

feat(react): add richer profiling traces for hooks and hydrate #2235 — Modifications to backgroundSnapshot.ts and hydration patch handling that overlap with this PR's per-slot filtering and InsertBefore emission logic.
refactor: extract swc_plugin_snapshot & swc_plugin_list #1819 — Updates to the same SWC transform plugin crates (swc_plugin_snapshot, swc_plugin_list) with related dynamic-part API and slot-based transformations.
fix(react): wrap <wrapper> for JSX with dynamic key #1541 — Changes to dynamic-key wrapping and dynamic-part/slot handling that align with this PR's SlotV2 introduction and transform updates.

Suggested reviewers

gaoachao
hzy
Yradex
colinaaa

Poem

🐰 Hopping through slots, new and true,
SlotIndex tracking, fresh and new!
V2 variants dance with every child,
Transform and runtime—perfectly styled,
Snapshots bloom with metadata bright! 🌟

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 15.79% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat(react): optimize the number and depth of snapshot' accurately describes the primary objective of the changeset, which focuses on optimizing snapshot structures across the React runtime.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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codecov · 2025-09-17T04:04:19Z

Codecov Report

❌ Patch coverage is 51.51515% with 368 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...n_view_with_static_sibling_with_snapshot_nested.js	0.00%	137 Missing ⚠️
..._list_in_view_with_static_sibling_with_snapshot.js	0.00%	64 Missing ⚠️
....rs/should_transform_list_in_view_with_snapshot.js	0.00%	53 Missing ⚠️
...ansform_list_in_view_with_static_sibling_nested.js	0.00%	16 Missing ⚠️
.../react/transform/crates/swc_plugin_snapshot/lib.rs	92.68%	12 Missing ⚠️
...apshots__/lib.rs/should_inject_implicit_flatten.js	0.00%	10 Missing ⚠️
...ould_transform_list_in_view_with_static_sibling.js	0.00%	7 Missing ⚠️
...snapshots__/lib.rs/full_static_children_map_jsx.js	0.00%	7 Missing ⚠️
..._list/tests/__swc_snapshots__/lib.rs/basic_list.js	0.00%	6 Missing ⚠️
...swc_snapshots__/lib.rs/basic_list_with_fragment.js	0.00%	6 Missing ⚠️
... and 15 more

📢 Thoughts on this report? Let us know!

relativeci · 2025-09-17T04:19:51Z

React Example

#7436 Bundle Size — 224.28KiB (+0.41%).

afd2d6a(current) vs 9e149c4 main#7425(baseline)

Bundle metrics

2 changes

	Current #7436	Baseline #7425
Initial JS	`0B`	`0B`
Initial CSS	`0B`	`0B`
Cache Invalidation	`34.74%`	`0%`
Chunks	`0`	`0`
Assets	`4`	`4`
Modules	`179`	`179`
Duplicate Modules	`69`	`69`
Duplicate Code	`44.5%`(`+0.04%`)	`44.48%`
Packages	`2`	`2`
Duplicate Packages	`0`	`0`

Bundle size by type

1 change

1 regression

	Current #7436	Baseline #7425
IMG	`145.76KiB`	`145.76KiB`
Other	`78.52KiB` (`+1.19%`)	`77.6KiB`

Bundle analysis report Branch hzy:p/hzy/opt-slot_0 Project dashboard

^{Generated by RelativeCI Documentation Report issue}

relativeci · 2025-09-17T04:19:54Z

Web Explorer

#9011 Bundle Size — 898.15KiB (0%).

afd2d6a(current) vs 9e149c4 main#8999(baseline)

Bundle metrics no changes

	Current #9011	Baseline #8999
Initial JS	`44.47KiB`	`44.47KiB`
Initial CSS	`2.22KiB`	`2.22KiB`
Cache Invalidation	`0%`	`0.24%`
Chunks	`9`	`9`
Assets	`11`	`11`
Modules	`230`	`230`
Duplicate Modules	`11`	`11`
Duplicate Code	`27.21%`	`27.21%`
Packages	`10`	`10`
Duplicate Packages	`0`	`0`

Bundle size by type no changes

	Current #9011	Baseline #8999
JS	`494.3KiB`	`494.3KiB`
Other	`401.63KiB`	`401.63KiB`
CSS	`2.22KiB`	`2.22KiB`

Bundle analysis report Branch hzy:p/hzy/opt-slot_0 Project dashboard

^{Generated by RelativeCI Documentation Report issue}

codspeed-hq · 2025-09-17T04:22:25Z

Merging this PR will degrade performance by 22.68%

❌ 13 regressed benchmarks
✅ 68 untouched benchmarks
⏩ 26 skipped benchmarks¹

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

Performance Changes

	Benchmark	`BASE`	`HEAD`	Efficiency
❌	`003-hello-list-hydrate`	9.1 ms	10.5 ms	-13.74%
❌	`006-static-raw-text-renderBackground`	3.2 ms	3.4 ms	-5.59%
❌	`003-hello-list__main-thread-transferRoot`	186.7 µs	214.1 µs	-12.81%
❌	`003-hello-list__main-thread-serializeRoot`	4.1 ms	4.4 ms	-6.87%
❌	`003-hello-list__main-thread-componentAtIndex__reuse`	3.3 ms	3.5 ms	-7.22%
❌	`002-hello-reactLynx__main-thread-serializeRoot`	561.4 µs	618.1 µs	-9.18%
❌	`002-hello-reactLynx-destroyBackground`	678.7 µs	824.4 µs	-17.67%
❌	`002-hello-reactLynx-hydrate`	1.6 ms	1.8 ms	-10.92%
❌	`006-static-raw-text__main-thread-serializeRoot`	984.6 µs	1,112.6 µs	-11.51%
❌	`007-four-layer-views-hydrate`	123.4 ms	141.6 ms	-12.81%
❌	`007-four-layer-views__main-thread-transferRoot`	909.3 µs	1,176 µs	-22.68%
❌	`007-four-layer-views-renderBackground`	265.9 ms	282.1 ms	-5.74%
❌	`007-four-layer-views__main-thread-serializeRoot`	68.5 ms	78.3 ms	-12.5%

_{Comparing hzy:p/hzy/opt-slot_0 (afd2d6a) with main (9e149c4)}

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. ↩

upupming · 2025-09-22T08:45:00Z

I think we can safely remove wrapper from the initial value snapshotManager.values because we will never produce jsxDev('wrapper') now!

lynx-stack/packages/react/runtime/src/snapshot.ts

Lines 79 to 94 in 886715b

    
           [ 
        
             'wrapper', 
        
             { 
        
               create() { 
        
                 /* v8 ignore start */ 
        
                 if (__JS__ && !__DEV__) { 
        
                   return []; 
        
                 } 
        
                 /* v8 ignore stop */ 
        
                 return [__CreateWrapperElement(__pageId)]; 
        
               }, 
        
               update: [], 
        
               slot: __DynamicPartChildren_0, 
        
               isListHolder: false, 
        
             }, 
        
           ],

It seems we cannot remove this since we want to be compatible with lower version lazy bundle.

relativeci · 2026-04-16T12:56:12Z

React External

#554 Bundle Size — 582.19KiB (+0.31%).

afd2d6a(current) vs 9e149c4 main#542(baseline)

Bundle metrics

1 change

	Current #554	Baseline #542
Initial JS	`0B`	`0B`
Initial CSS	`0B`	`0B`
Cache Invalidation	`98.34%`	`0%`
Chunks	`0`	`0`
Assets	`3`	`3`
Modules	`17`	`17`
Duplicate Modules	`5`	`5`
Duplicate Code	`8.59%`	`8.59%`
Packages	`0`	`0`
Duplicate Packages	`0`	`0`

Bundle size by type

1 change

1 regression

	Current #554	Baseline #542
Other	`582.19KiB` (`+0.31%`)	`580.37KiB`

Bundle analysis report Branch hzy:p/hzy/opt-slot_0 Project dashboard

^{Generated by RelativeCI Documentation Report issue}

relativeci · 2026-04-16T12:56:17Z

React MTF Example

#569 Bundle Size — 195.44KiB (+0.76%).

afd2d6a(current) vs 9e149c4 main#557(baseline)

Bundle metrics

2 changes

	Current #569	Baseline #557
Initial JS	`0B`	`0B`
Initial CSS	`0B`	`0B`
Cache Invalidation	`42.65%`	`0%`
Chunks	`0`	`0`
Assets	`3`	`3`
Modules	`173`	`173`
Duplicate Modules	`66`	`66`
Duplicate Code	`43.98%`(`+0.09%`)	`43.94%`
Packages	`2`	`2`
Duplicate Packages	`0`	`0`

Bundle size by type

1 change

1 regression

	Current #569	Baseline #557
IMG	`111.23KiB`	`111.23KiB`
Other	`84.2KiB` (`+1.78%`)	`82.73KiB`

Bundle analysis report Branch hzy:p/hzy/opt-slot_0 Project dashboard

^{Generated by RelativeCI Documentation Report issue}

This reverts commit 2e49b89.

…reconcile" This reverts commit 9c89ba9.

This reverts commit f18bbf3.

hzy force-pushed the p/hzy/opt-slot_0 branch from c918ede to df58cf7 Compare September 18, 2025 06:06

upupming reviewed Sep 18, 2025

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Comment thread packages/react/transform/crates/swc_plugin_snapshot/slot_marker.rs

hzy force-pushed the p/hzy/opt-slot_0 branch from df58cf7 to 1d78086 Compare September 18, 2025 16:30

feat(react): optimize the number and depth of snapshot

b109ea2

hzy force-pushed the p/hzy/opt-slot_0 branch from 1d78086 to b109ea2 Compare September 22, 2025 03:06

upupming reviewed Sep 22, 2025

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Comment thread packages/react/runtime/src/snapshot.ts Outdated

upupming reviewed Sep 22, 2025

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Comment thread packages/react/runtime/__test__/basic.test.jsx

Comment thread packages/react/runtime/lazy/internal.js

Comment thread packages/react/runtime/src/snapshot/snapshot.ts

Comment thread packages/react/runtime/src/lifecycle/patch/snapshotPatchApply.ts Outdated

upupming reviewed Oct 9, 2025

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Comment thread ...sform/crates/swc_plugin_list/tests/__swc_snapshots__/lib.rs/should_transform_list_in_view.js

feat: make test pass

f445c76

hzy commented Oct 9, 2025

View reviewed changes

Comment thread packages/react/runtime/__test__/preact.test.jsx Outdated

upupming added 12 commits October 10, 2025 14:05

fix: test case of hydrate and list

acc8e45

fix: slotIndex for setupDocument

b7eba1d

fix: renderComponent slotIndex

ca7232d

fix: slotIndex of RLTL

49cd30b

Merge remote-tracking branch 'gh/main' into p/hzy/opt-slot_0

ce28aff

feat: update cargo snapshot

6b05166

chore: dprint format

c57f3bf

Merge remote-tracking branch 'gh/main' into p/hzy/opt-slot_0

840b0e4

chore: clean up console.log

6367bdb

chore: update turbo.json

11a436c

feat: add insertBefore operation example

8a662b7

feat: update test cases

abe20ac

upupming force-pushed the p/hzy/opt-slot_0 branch from 0d1a1d0 to c165c4c Compare April 16, 2026 12:31

upupming requested a review from Sherry-hue as a code owner April 16, 2026 12:31

upupming added 12 commits April 16, 2026 23:17

feat: reduce fragment on single slot child

48579db

feat: eliminate multi-slot Fragment via flatten + slot-aware reconcile

9c89ba9

feat: simplify slotMap

2e49b89

Revert "feat: simplify slotMap"

11ce6bb

This reverts commit 2e49b89.

Revert "feat: eliminate multi-slot Fragment via flatten + slot-aware …

17ed3cf

…reconcile" This reverts commit 9c89ba9.

chore: upgrade preact

9ed7712

fix: snapshot

78946fc

fix: test cases

e9b386d

Merge remote-tracking branch 'origin/main' into p/hzy/opt-slot_0

2ceaf27

fix: remove unused test

f18bbf3

feat: reduce empty text vnode and dom

6bd678d

Merge remote-tracking branch 'origin/main' into p/hzy/opt-slot_0

60b047a

upupming force-pushed the p/hzy/opt-slot_0 branch from efd07a5 to 60b047a Compare April 20, 2026 13:47

fix: wrapper in suspense should always use $0

cfb0a4b

upupming force-pushed the p/hzy/opt-slot_0 branch from 4da2640 to cfb0a4b Compare April 20, 2026 15:22

upupming added 2 commits April 20, 2026 23:24

Revert "fix: remove unused test"

159280d

This reverts commit f18bbf3.

chore: changeset

afd2d6a

upupming force-pushed the p/hzy/opt-slot_0 branch from a28b4ca to afd2d6a Compare April 20, 2026 15:48

HuJean approved these changes Apr 21, 2026

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colinaaa approved these changes Apr 21, 2026

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PupilTong approved these changes Apr 21, 2026

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gaoachao approved these changes Apr 21, 2026

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upupming approved these changes Apr 21, 2026

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upupming merged commit cffd0b1 into lynx-family:main Apr 21, 2026
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github-actions Bot mentioned this pull request Apr 20, 2026

chore: Release 2026-04-24 14:53:52 #2477

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coderabbitai Bot mentioned this pull request Apr 21, 2026

feat: reduce slotIndex to save json serialization time #2486

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