chore(start): remove redundant splitChunks config from React plugin

[chenjiahan]

TanStack Start already configures Rsbuild to split async chunks. This prevents @rsbuild/plugin-react from adding its chunk groups, so splitChunks: false is redundant.

This PR removes the option from benchmarks, e2e fixtures, and docs without changing build output.

Summary by CodeRabbit

• Improvements
  • React applications now use the default code-splitting behavior, enabling split chunks for improved bundle optimization.
  • Updated React examples, documentation, and end-to-end scenarios to reflect the default configuration.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: b45a81b1-822c-4400-92e3-3cb381ab9e71

📥 Commits

Reviewing files that changed from the base of the PR and between cb281d7 and d555b35.

📒 Files selected for processing (11)

• benchmarks/bundle-size/scenarios/react-start-full/rsbuild.config.ts
• benchmarks/bundle-size/scenarios/react-start-minimal/rsbuild.config.ts
• docs/start/framework/react/guide/server-components.md
• e2e/react-start/basic/rsbuild.config.ts
• e2e/react-start/css-inline/rsbuild.config.ts
• e2e/react-start/custom-server-rsbuild/rsbuild.config.ts
• e2e/react-start/deferred-hydration/rsbuild.config.ts
• e2e/react-start/hmr/rsbuild.config.ts
• e2e/react-start/rsbuild/rsbuild.config.ts
• e2e/react-start/rsc-rsbuild/rsbuild.config.ts
• e2e/react-start/rsc/rsbuild.config.ts

Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review.

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📝 Walkthrough

Walkthrough

The React plugin configurations no longer pass splitChunks: false. Benchmarks, documentation, and end-to-end scenarios now use the plugin’s default split-chunk behavior.

Changes

React plugin default configuration

Layer / File(s)	Summary
Remove explicit split-chunk disablement benchmarks/bundle-size/scenarios/react-start-*/rsbuild.config.ts, docs/start/framework/react/guide/server-components.md, e2e/react-start/*/rsbuild.config.ts	All affected pluginReact calls now use default options instead of setting splitChunks: false.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to d555b

This PR removes redundant chunk-splitting configuration from React Start examples, benchmarks, and fixtures without an identified behavior regression; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: schiller-manuel

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the removal of the redundant splitChunks configuration from the React plugin.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 10 files. (1 skipped: 1 unsupported.)
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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---

☁️ Nx Cloud last updated this comment at 2026-08-21 21:09:21 UTC

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commit: d555b35

[codspeed-hq]

Merging this PR will regress 5 benchmarks

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 6 improved benchmarks
❌ 5 regressed benchmarks
✅ 169 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	mem server serialization-payload (solid)	4.6 MB	5.2 MB	-12.67%
❌	Memory	mem client unique-location-churn (vue)	463.2 KB	510.4 KB	-9.26%
❌	Memory	mem server error-paths redirect (react)	296.3 KB	311.7 KB	-4.94%
❌	Memory	mem server error-paths error (solid)	970 KB	1,017.6 KB	-4.68%
❌	Simulation	client-async-pipeline navigation loop (react)	102.8 ms	107.1 ms	-3.99%
⚡	Memory	mem server error-paths unmatched (react)	1,830.3 KB	424.8 KB	×4.3
⚡	Memory	mem server error-paths not-found (vue)	2,071.7 KB	503.1 KB	×4.1
⚡	Memory	mem server request-churn (react)	712.7 KB	664.8 KB	+7.22%
⚡	Memory	mem server server-fn-churn (vue)	345.7 KB	323.7 KB	+6.82%
⚡	Memory	mem server error-paths not-found (solid)	570 KB	547.5 KB	+4.1%
⚡	Memory	mem server error-paths redirect (solid)	373 KB	358.5 KB	+4.06%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing chenjiahan:chenjiahan/remove-redundant-react-split-chunks (d555b35) with main (cb281d7)}

[chenjiahan]

These CI failures look like permission issues, the workflows couldn’t post comments or labels due to the fork’s read-only token.