perf(react-router): direct export of CatchBoundary class component, remove function wrapper

[Sheraff]

minor change to reduce bundle size.
technically not exactly the same at runtime, but for all intents and purposes it should be equivalent.

Summary by CodeRabbit

• New Features

  • CatchBoundary is now directly available as a React class component, providing a more consistent integration option for applications using React Router.

• Bug Fixes

  • Improved the component’s public export behavior without changing its supported props or error-handling capabilities.

• Documentation

  • Added a patch release note documenting the updated CatchBoundary export.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit fb35c8e

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	15m 26s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	2m 10s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-08-14 22:04:17 UTC

[github-actions]

🚀 Changeset Version Preview

4 package(s) bumped directly, 19 bumped as dependents.

🟩 Patch bumps

Package	Version	Reason
@tanstack/react-router	1.170.28 → 1.170.29	Changeset
@tanstack/router-core	1.171.23 → 1.171.24	Changeset
@tanstack/solid-router	1.170.26 → 1.170.27	Changeset
@tanstack/vue-router	1.170.25 → 1.170.26	Changeset
@tanstack/react-start	1.168.45 → 1.168.46	Dependent
@tanstack/react-start-client	1.168.26 → 1.168.27	Dependent
@tanstack/react-start-rsc	0.1.44 → 0.1.45	Dependent
@tanstack/react-start-server	1.167.33 → 1.167.34	Dependent
@tanstack/router-cli	1.167.29 → 1.167.30	Dependent
@tanstack/router-generator	1.167.29 → 1.167.30	Dependent
@tanstack/router-plugin	1.168.31 → 1.168.32	Dependent
@tanstack/router-vite-plugin	1.167.31 → 1.167.32	Dependent
@tanstack/solid-start	1.168.43 → 1.168.44	Dependent
@tanstack/solid-start-client	1.168.25 → 1.168.26	Dependent
@tanstack/solid-start-server	1.167.32 → 1.167.33	Dependent
@tanstack/start-client-core	1.170.23 → 1.170.24	Dependent
@tanstack/start-plugin-core	1.171.35 → 1.171.36	Dependent
@tanstack/start-server-core	1.169.27 → 1.169.28	Dependent
@tanstack/start-static-server-functions	1.167.28 → 1.167.29	Dependent
@tanstack/start-storage-context	1.167.25 → 1.167.26	Dependent
@tanstack/vue-start	1.168.42 → 1.168.43	Dependent
@tanstack/vue-start-client	1.167.28 → 1.167.29	Dependent
@tanstack/vue-start-server	1.167.32 → 1.167.33	Dependent

[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: 90a7cadb-846b-49f7-97af-4669e1f23b8b

📥 Commits

Reviewing files that changed from the base of the PR and between 53b63cf and 92b5e04.

📒 Files selected for processing (2)

• .changeset/whole-bikes-grin.md
• packages/react-router/src/CatchBoundary.tsx

---

📝 Walkthrough

Walkthrough

CatchBoundary is now exported directly as a React component class. The patch changeset records this API change.

Changes

CatchBoundary export

Layer / File(s)	Summary
Direct class export and release metadata packages/react-router/src/CatchBoundary.tsx, .changeset/whole-bikes-grin.md	The functional wrapper is removed. The CatchBoundary React component class is exported directly. A patch changeset records the change.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 92b5e

This localized change directly exports the CatchBoundary class component and removes its function wrapper; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: directly exporting the CatchBoundary class component and removing its function wrapper.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bundle-react-router-direct-export-class-catchboundary-component

---

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[github-actions]

Bundle Size Benchmarks

• Commit: 1fa995f3b7a4
• Measured at: 2026-08-14T21:48:08.072Z
• Baseline source: history:bdaf73a4063e
• Dashboard: bundle-size history

The following scenarios have bundle-size changes compared with the baseline:

Scenario	Current (gzip)	Delta vs baseline	Initial gzip	Raw	Brotli	Trend
react-router.minimal	83.83 KiB	-12 B (-0.01%)	83.69 KiB	262.42 KiB	72.92 KiB	█▂▂▂▂▂▂▆▆▅▂▁
react-router.full	87.32 KiB	-10 B (-0.01%)	87.18 KiB	274.13 KiB	75.85 KiB	█▃▃▃▃▃▃▆▆▄▂▁
react-start.minimal	96.62 KiB	-19 B (-0.02%)	96.48 KiB	304.65 KiB	83.73 KiB	█▃▃▃▃▃▃▆▆▄▂▁
react-start.deferred-hydration	97.35 KiB	-24 B (-0.02%)	96.51 KiB	306.01 KiB	84.35 KiB	█▃▃▃▃▃▃▆▆▄▂▁
react-start.full	99.80 KiB	+2 B (+0.00%)	99.67 KiB	314.37 KiB	86.51 KiB	█▃▃▃▃▃▃▆▆▃▁▁
react-start.rsbuild.minimal	99.96 KiB	-15 B (-0.01%)	99.79 KiB	315.03 KiB	86.24 KiB	█▁▁▁▁▁▁▆▆▅▂▁
react-start.rsbuild.minimal-iife	100.37 KiB	-14 B (-0.01%)	100.21 KiB	315.97 KiB	86.58 KiB	█▁▁▁▁▁▁▆▆▆▂▁
react-start.rsbuild.full	103.29 KiB	-11 B (-0.01%)	103.12 KiB	325.12 KiB	88.94 KiB	█▁▁▁▁▁▁▅▅▅▂▁

Current gzip tracks all emitted client JS chunks. Initial gzip tracks only the entry/import graph. Trend sparkline is historical current gzip ending with this PR measurement; lower is better.

[pkg-pr-new]

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commit: fb35c8e

[codspeed-hq]

Merging this PR will degrade performance by 12.56%

⚠️ 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

⚡ 7 improved benchmarks
❌ 10 (👁 10) regressed benchmarks
✅ 163 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	mem server error-paths not-found (vue)	2,190.4 KB	485.6 KB	×4.5
⚡	Simulation	client-mount loop (react)	129.2 ms	119.3 ms	+8.27%
⚡	Memory	mem server server-fn-churn (react)	395.7 KB	376.3 KB	+5.16%
⚡	Simulation	client-search-params navigation loop (react)	177 ms	169.6 ms	+4.36%
⚡	Memory	mem client navigation-churn (vue)	1.7 MB	1.6 MB	+4.33%
⚡	Simulation	ssr control-flow route headers (react)	308.5 ms	299.2 ms	+3.12%
👁	Memory	mem server error-paths redirect (vue)	419.3 KB	473.7 KB	-11.48%
👁	Memory	mem server peak-large-page (vue)	1,010.6 KB	1,097.6 KB	-7.93%
👁	Memory	mem server server-fn-churn (vue)	325.3 KB	4,856.3 KB	-93.3%
👁	Memory	mem server error-paths unmatched (react)	415.8 KB	777.8 KB	-46.54%
👁	Memory	mem server error-paths not-found (solid)	584.7 KB	567.4 KB	+3.05%
👁	Memory	mem server error-paths redirect (solid)	370.1 KB	392.8 KB	-5.78%
👁	Simulation	client-side navigation loop (react)	126.8 ms	142.9 ms	-11.26%
👁	Simulation	client-async-pipeline navigation loop (react)	100.1 ms	107.3 ms	-6.67%
👁	Simulation	client-links navigation loop (react)	295.6 ms	308 ms	-4.01%
👁	Memory	mem client unique-location-churn (vue)	487.9 KB	530.2 KB	-7.97%
👁	Memory	mem client navigation-churn (solid)	677 KB	793.3 KB	-14.66%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing bundle-react-router-direct-export-class-catchboundary-component (fb35c8e) with main (bdaf73a)}