fix(web): this may be undefined in Card()

[Sherry-hue]

Summary by CodeRabbit

• Bug Fixes
  • Fixed an issue where the Card component could encounter undefined context errors in web worker environments.

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]

🦋 Changeset detected

Latest commit: b710a3a

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

This PR includes changesets to release 11 packages

Name	Type
@lynx-js/web-worker-runtime	Patch
@lynx-js/web-core	Patch
upgrade-rspeedy	Patch
@lynx-js/web-rsbuild-server-middleware	Patch
@lynx-js/web-core-server	Patch
@lynx-js/web-constants	Patch
@lynx-js/web-mainthread-apis	Patch
@lynx-js/web-worker-rpc	Patch
@lynx-js/web-style-transformer	Patch
@lynx-js/rspeedy	Patch
create-rspeedy	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]

📝 Walkthrough

Walkthrough

This PR introduces a fix for a this binding issue in the web-worker-runtime by adding .bind(tt) to Card and Component function references passed during bundle initialization, alongside a corresponding changeset entry for the patch version bump.

Changes

Cohort / File(s)	Summary
Changeset metadata .changeset/petite-trains-take.md	Adds changeset entry bumping @lynx-js/web-worker-runtime to patch version with fix note for Card() this binding issue
Web-worker-runtime fix packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts	Binds Card and Component functions with .bind(tt) when passed to bundle initialization to ensure correct this context

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

• Focused, minimal change targeting a specific this binding issue
• Single code file with straightforward function binding additions
• Requires understanding the binding semantics and initialization flow context

Possibly related PRs

• feat: support load bts chunk from remote address #1834: Modifies related chunk-loading and bootstrap code; the binding fix in this PR directly complements work on the createChunkLoading wiring.

Suggested reviewers

• PupilTong
• colinaaa

Poem

🐰 A little hop through context binding,
Where this was lost, now it's winning!
With .bind(tt) so snug and tight,
Card and Component shine so bright! ✨

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and specifically identifies the main fix: binding the 'this' context in Card() to prevent undefined reference errors.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

---

📜 Recent review details

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ffd193b and b710a3a.

📒 Files selected for processing (2)

• .changeset/petite-trains-take.md (1 hunks)
• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts (1 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

.changeset/*.md

📄 CodeRabbit inference engine (AGENTS.md)

For contributions, generate and commit a Changeset describing your changes

Files:

• .changeset/petite-trains-take.md

🧠 Learnings (15)

📓 Common learnings

Learnt from: Sherry-hue
Repo: lynx-family/lynx-stack PR: 1770
File: packages/web-platform/web-mainthread-apis/src/utils/processStyleInfo.ts:316-318
Timestamp: 2025-09-18T08:12:56.802Z
Learning: In packages/web-platform/web-mainthread-apis/src/utils/processStyleInfo.ts, the current implementation uses cardStyleElement.textContent += for lazy component styles. While this could theoretically invalidate rule indices by reparsing the stylesheet, Sherry-hue indicated that UIDs don't repeat for the same element, making this approach acceptable for now. A future optimization to use separate style elements per entry was discussed but deferred to a separate PR to keep the current lazy bundle PR focused.

Learnt from: f0rdream
Repo: lynx-family/lynx-stack PR: 1835
File: packages/react/worklet-runtime/src/workletRuntime.ts:52-55
Timestamp: 2025-09-28T08:46:43.177Z
Learning: The legacy worklet path with `_lepusWorkletHash` in `packages/react/worklet-runtime/src/workletRuntime.ts` is preserved for compatibility with MTS (Mini-app Threading Service) that doesn't support Initial Frame Rendering. This path will not be touched in current implementations.

📚 Learning: 2025-09-12T09:43:04.847Z

Learnt from: gaoachao
Repo: lynx-family/lynx-stack PR: 1736
File: .changeset/spotty-experts-smoke.md:1-3
Timestamp: 2025-09-12T09:43:04.847Z
Learning: In the lynx-family/lynx-stack repository, empty changeset files (containing only `---\n\n---`) are used for internal changes that modify src/** files but don't require meaningful release notes, such as private package changes or testing-only modifications. This satisfies CI requirements without generating user-facing release notes.

Applied to files:

• .changeset/petite-trains-take.md

📚 Learning: 2025-07-22T09:23:07.797Z

Learnt from: colinaaa
Repo: lynx-family/lynx-stack PR: 1330
File: .changeset/olive-animals-attend.md:1-3
Timestamp: 2025-07-22T09:23:07.797Z
Learning: In the lynx-family/lynx-stack repository, changesets are only required for meaningful changes to end-users such as bugfixes and features. Internal/development changes like chores, refactoring, or removing debug info do not need changeset entries.

Applied to files:

• .changeset/petite-trains-take.md

📚 Learning: 2025-09-12T09:43:04.847Z

Learnt from: gaoachao
Repo: lynx-family/lynx-stack PR: 1736
File: .changeset/spotty-experts-smoke.md:1-3
Timestamp: 2025-09-12T09:43:04.847Z
Learning: In the lynx-family/lynx-stack repository, private packages (marked with "private": true in package.json) like lynx-js/react-transform don't require meaningful changeset entries even when their public APIs change, since they are not published externally and only affect internal development.

Applied to files:

• .changeset/petite-trains-take.md
• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

📚 Learning: 2025-07-22T09:26:16.722Z

Learnt from: colinaaa
Repo: lynx-family/lynx-stack PR: 1330
File: .changeset/olive-animals-attend.md:1-3
Timestamp: 2025-07-22T09:26:16.722Z
Learning: In the lynx-family/lynx-stack repository, CI checks require changesets when files matching the pattern "src/**" are modified (as configured in .changeset/config.json). For internal changes that don't need meaningful changesets, an empty changeset file is used to satisfy the CI requirement while not generating any release notes.

Applied to files:

• .changeset/petite-trains-take.md

📚 Learning: 2025-08-07T04:00:59.645Z

Learnt from: colinaaa
Repo: lynx-family/lynx-stack PR: 1454
File: pnpm-workspace.yaml:46-46
Timestamp: 2025-08-07T04:00:59.645Z
Learning: In the lynx-family/lynx-stack repository, the webpack patch (patches/webpack5.101.0.patch) was created to fix issues with webpack5.99.9 but only takes effect on webpack5.100.0 and later versions. The patchedDependencies entry should use "webpack@^5.100.0" to ensure the patch applies to the correct version range.

Applied to files:

• .changeset/petite-trains-take.md

📚 Learning: 2025-09-18T08:12:56.802Z

Learnt from: Sherry-hue
Repo: lynx-family/lynx-stack PR: 1770
File: packages/web-platform/web-mainthread-apis/src/utils/processStyleInfo.ts:316-318
Timestamp: 2025-09-18T08:12:56.802Z
Learning: In packages/web-platform/web-mainthread-apis/src/utils/processStyleInfo.ts, the current implementation uses cardStyleElement.textContent += for lazy component styles. While this could theoretically invalidate rule indices by reparsing the stylesheet, Sherry-hue indicated that UIDs don't repeat for the same element, making this approach acceptable for now. A future optimization to use separate style elements per entry was discussed but deferred to a separate PR to keep the current lazy bundle PR focused.

Applied to files:

• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

📚 Learning: 2025-09-28T07:52:03.601Z

Learnt from: Sherry-hue
Repo: lynx-family/lynx-stack PR: 1837
File: packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createNativeApp.ts:151-154
Timestamp: 2025-09-28T07:52:03.601Z
Learning: There are two different registerUpdateDataHandler functions in the lynx-stack codebase:
1. Main thread version in packages/web-platform/web-worker-runtime/src/mainThread/crossThreadHandlers/registerUpdateDataHandler.ts takes (mainThreadRpc: Rpc, backgroundThreadRpc: Rpc, runtime: MainThreadGlobalThis)
2. Background thread version in packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/crossThreadHandlers/registerUpdateDataHandler.ts takes only (rpc: Rpc, tt: NativeTTObject)

Applied to files:

• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

📚 Learning: 2025-09-28T07:52:03.601Z

Learnt from: Sherry-hue
Repo: lynx-family/lynx-stack PR: 1837
File: packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createNativeApp.ts:151-154
Timestamp: 2025-09-28T07:52:03.601Z
Learning: There are two different registerUpdateDataHandler functions in the lynx-stack codebase:
1. Main thread version in packages/web-platform/web-worker-runtime/src/mainThread/crossThreadHandlers/registerUpdateDataHandler.ts takes (mainThreadRpc: Rpc, backgroundThreadRpc: Rpc, runtime: MainThreadGlobalThis)
2. Background thread version in packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/crossThreadHandlers/registerUpdateDataHandler.ts takes only (rpc: Rpc, tt: any)

Applied to files:

• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

📚 Learning: 2025-10-10T08:22:12.051Z

Learnt from: Sherry-hue
Repo: lynx-family/lynx-stack PR: 1837
File: packages/web-platform/web-mainthread-apis/src/prepareMainThreadAPIs.ts:266-266
Timestamp: 2025-10-10T08:22:12.051Z
Learning: In packages/web-platform/web-mainthread-apis, the handleUpdatedData function returned from prepareMainThreadAPIs is internal-only, used to serve web-core. It does not require public documentation, type exports, or SSR support.

Applied to files:

• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

📚 Learning: 2025-09-28T08:46:43.177Z

Learnt from: f0rdream
Repo: lynx-family/lynx-stack PR: 1835
File: packages/react/worklet-runtime/src/workletRuntime.ts:52-55
Timestamp: 2025-09-28T08:46:43.177Z
Learning: The legacy worklet path with `_lepusWorkletHash` in `packages/react/worklet-runtime/src/workletRuntime.ts` is preserved for compatibility with MTS (Mini-app Threading Service) that doesn't support Initial Frame Rendering. This path will not be touched in current implementations.

Applied to files:

• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

📚 Learning: 2025-08-12T16:09:32.413Z

Learnt from: colinaaa
Repo: lynx-family/lynx-stack PR: 1497
File: packages/react/transform/tests/__swc_snapshots__/src/swc_plugin_snapshot/mod.rs/basic_full_static.js:9-10
Timestamp: 2025-08-12T16:09:32.413Z
Learning: In the Lynx stack, functions prefixed with `__` that are called in transformed code may be injected globally by the Lynx Engine at runtime rather than exported from the React runtime package. For example, `__CreateFrame` is injected globally by the Lynx Engine, not exported from lynx-js/react.

Applied to files:

• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

📚 Learning: 2025-08-27T12:42:01.095Z

Learnt from: upupming
Repo: lynx-family/lynx-stack PR: 1616
File: packages/webpack/cache-events-webpack-plugin/test/cases/not-cache-events/lazy-bundle/index.js:3-3
Timestamp: 2025-08-27T12:42:01.095Z
Learning: In webpack, properties like __webpack_require__.lynx_ce are injected during compilation/build time when webpack processes modules and generates bundles, not at runtime when dynamic imports execute. Tests for such properties don't need to wait for dynamic imports to complete.

Applied to files:

• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

📚 Learning: 2025-08-21T08:46:54.494Z

Learnt from: upupming
Repo: lynx-family/lynx-stack PR: 1370
File: packages/webpack/cache-events-webpack-plugin/src/LynxCacheEventsRuntimeModule.ts:23-27
Timestamp: 2025-08-21T08:46:54.494Z
Learning: In Lynx webpack runtime modules, the team prioritizes performance and simplicity over defensive runtime error handling. They prefer relying on compile-time type safety (TypeScript) rather than adding runtime checks like try-catch blocks or type validation, especially for performance-critical code like cache event setup/cleanup functions.

Applied to files:

• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

📚 Learning: 2025-08-13T11:46:43.737Z

Learnt from: colinaaa
Repo: lynx-family/lynx-stack PR: 1523
File: vitest.config.ts:5-6
Timestamp: 2025-08-13T11:46:43.737Z
Learning: In the lynx-stack codebase, default imports are consistently used for Node.js built-in modules (e.g., `import os from 'node:os'`, `import fs from 'node:fs'`). The TypeScript configuration supports esModuleInterop and allowSyntheticDefaultImports, making default imports the preferred pattern over namespace imports for Node.js built-ins.

Applied to files:

• packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts

🔇 Additional comments (2)

.changeset/petite-trains-take.md (1)

1-5: LGTM! Changeset format is correct.

The changeset appropriately documents this bugfix with a patch version bump for @lynx-js/web-worker-runtime.

packages/web-platform/web-worker-runtime/src/backgroundThread/background-apis/createChunkLoading.ts (1)

117-117: Binding of Card and Component is correct and complete.

The verification confirms that binding tt.Card and tt.Component at lines 117 and 123 is intentional and correct. These are constructors that require this context preservation. Other APIs like fetch and XMLHttpRequest are either already wrapped/bound in the tt object implementation or don't rely on this context, which explains why they don't need explicit binding. No other APIs in the codebase use this pattern, confirming the implementation is complete.

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[codecov]

Codecov Report

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

📢 Thoughts on this report? Let us know!

[codspeed-hq]

CodSpeed Performance Report

Merging #1922 will improve performances by 9.08%

_{Comparing Sherry-hue:fix/card-this-undefined (b710a3a) with main (ffd193b)}

Summary

⚡ 1 improvement
✅ 62 untouched
⏩ 3 skipped¹

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	transform 1000 view elements	45.9 ms	42 ms	+9.08%

Footnotes

1. 3 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]

React Example

#6143 Bundle Size — 234.35KiB (-1.56%).

b710a3a(current) vs 83952a0 main#6132(baseline)

Bundle metrics  no changes

	Current #6143	Baseline #6132
Initial JS	0B	0B
Initial CSS	0B	0B
Cache Invalidation	0%	0%
Chunks	0	0
Assets	4	4
Modules	165	165
Duplicate Modules	67	67
Duplicate Code	46.78%	46.78%
Packages	2	2
Duplicate Packages	0	0

Bundle size by type   1 change 1 improvement

	Current #6143	Baseline #6132
IMG	145.76KiB	145.76KiB
Other	88.59KiB (-4.03%)	92.31KiB

Bundle analysis report Branch Sherry-hue:fix/card-this-undefin... Project dashboard

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[relativeci]

Web Explorer

#6144 Bundle Size — 366.72KiB (~+0.01%).

b710a3a(current) vs ffd193b main#6142(baseline)

Bundle metrics   1 change

	Current #6144	Baseline #6142
Initial JS	146.2KiB	146.2KiB
Initial CSS	32.22KiB	32.22KiB
Cache Invalidation	16.43%	0%
Chunks	8	8
Assets	8	8
Modules	220	220
Duplicate Modules	16	16
Duplicate Code	3.21%	3.21%
Packages	4	4
Duplicate Packages	0	0

Bundle size by type   1 change 1 regression

	Current #6144	Baseline #6142
JS	240.7KiB (~+0.01%)	240.68KiB
Other	93.8KiB	93.8KiB
CSS	32.22KiB	32.22KiB

Bundle analysis report Branch Sherry-hue:fix/card-this-undefin... Project dashboard

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