optimize load-client.ts for bundlesize

[schiller-manuel]

Summary by CodeRabbit

• Bug Fixes
  • Improved loader state handling so successful loads clear previous errors correctly.
  • Prevented redirects from applying unintended state changes.
  • Improved not-found boundary updates and pending UI behavior.
  • Ensured commit operations finish cleanly across successful, failed, restored, and rolled-back transitions.

[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: 402c88bd-8944-4c50-a789-4d267b3c583c

📥 Commits

Reviewing files that changed from the base of the PR and between c568caf and 78f53f3.

📒 Files selected for processing (1)

• packages/router-core/src/load-client.ts

---

📝 Walkthrough

Walkthrough

Changes

Client loader state handling

Layer / File(s)	Summary
Loader settlement and planning packages/router-core/src/load-client.ts	Redirects exit without mutation. Successful settlement clears errors before storing data or marking invalid matches. Loader planning uses normalized function and preload eligibility values.
Boundary and pending presentation packages/router-core/src/load-client.ts	Not-found handling reapplies the selected boundary. Pending presentation reveals successful fallback matches immediately.
Commit resolution across outcomes packages/router-core/src/load-client.ts	resolveCommit clears pending commit promises during rollback, restoration, successful transactions, and route-loading failures.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• TanStack/router#7805: Introduces the lane-based client loader implementation refined by these changes.

Suggested reviewers: sheraff

🚥 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 identifies the main change: optimizing load-client.ts to reduce bundle size.
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.

✨ 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 bundlesize-load-client

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[nx-cloud]

View your CI Pipeline Execution ↗ for commit 78f53f3

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	5m 11s	View ↗
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---

☁️ Nx Cloud last updated this comment at 2026-08-08 10:24:59 UTC

[github-actions]

🚀 Changeset Version Preview

No changeset entries found. Merging this PR will not cause a version bump for any packages.

[pkg-pr-new]

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commit: 78f53f3

[github-actions]

Bundle Size Benchmarks

• Commit: 411d0166e424
• Measured at: 2026-08-08T10:20:54.455Z
• Baseline source: history:c568caf3f376
• 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	83.88 KiB	-21 B (-0.02%)	83.75 KiB	262.46 KiB	73.01 KiB	█████████▁▁▁
react-router.full	87.39 KiB	-7 B (-0.01%)	87.25 KiB	274.18 KiB	76.04 KiB	█████████▁▁▁
solid-router.minimal	33.20 KiB	-20 B (-0.06%)	33.07 KiB	96.29 KiB	29.95 KiB	█████████▁▁▁
solid-router.full	38.03 KiB	-16 B (-0.04%)	37.91 KiB	110.93 KiB	34.26 KiB	█████████▁▁▁
vue-router.minimal	49.48 KiB	-13 B (-0.03%)	49.36 KiB	138.04 KiB	44.66 KiB	█████████▁▁▁
vue-router.full	55.06 KiB	-13 B (-0.02%)	54.94 KiB	156.22 KiB	49.58 KiB	█████████▁▁▁
react-start.minimal	96.66 KiB	-5 B (-0.01%)	96.52 KiB	304.63 KiB	83.76 KiB	█████████▁▁▁
react-start.deferred-hydration	97.38 KiB	-5 B (-0.01%)	96.54 KiB	305.98 KiB	84.31 KiB	█████████▁▁▁
react-start.full	99.84 KiB	+1 B (+0.00%)	99.70 KiB	314.35 KiB	86.43 KiB	█████████▁▁▁
react-start.rsbuild.minimal	99.98 KiB	-11 B (-0.01%)	99.81 KiB	315.17 KiB	86.29 KiB	▁▁▁▇▇▇▇████▇
react-start.rsbuild.minimal-iife	100.39 KiB	-14 B (-0.01%)	100.22 KiB	316.11 KiB	86.59 KiB	▁▁▁▇▇▆▆████▇
react-start.rsbuild.full	103.30 KiB	-15 B (-0.01%)	103.13 KiB	325.26 KiB	89.00 KiB	▁▁▁▆▆▅▅████▇
solid-start.minimal	45.93 KiB	-10 B (-0.02%)	45.81 KiB	137.30 KiB	40.87 KiB	█████████▁▁▁
solid-start.deferred-hydration	49.02 KiB	+13 B (+0.03%)	45.88 KiB	144.76 KiB	43.69 KiB	█████████▁▁▁
solid-start.full	51.02 KiB	-1 B (-0.00%)	50.89 KiB	152.68 KiB	45.22 KiB	█████████▁▁▁
vue-start.minimal	65.50 KiB	+15 B (+0.02%)	65.38 KiB	188.80 KiB	58.27 KiB	█████████▁▁▁
vue-start.full	69.29 KiB	+10 B (+0.01%)	69.17 KiB	201.07 KiB	61.50 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.

[codspeed-hq]

Merging this PR will degrade performance by 17.18%

⚠️ 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

⚡ 4 improved benchmarks
❌ 6 regressed benchmarks
✅ 170 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	mem server error-paths not-found (vue)	318.6 KB	2,130.5 KB	-85.04%
❌	Memory	mem client unique-location-churn (solid)	341.6 KB	588.7 KB	-41.97%
❌	Simulation	ssr dehydrate rich types (solid)	87.3 ms	99.8 ms	-12.49%
❌	Memory	mem client navigation-churn (solid)	570.2 KB	621 KB	-8.18%
❌	Simulation	ssr dehydrate plain control (solid)	119.6 ms	129.3 ms	-7.51%
❌	Simulation	ssr control-flow route headers (react)	85 ms	87.8 ms	-3.23%
⚡	Memory	mem server error-paths redirect (solid)	588.2 KB	277.9 KB	×2.1
⚡	Memory	mem client preload-churn (vue)	776.2 KB	735.9 KB	+5.47%
⚡	Simulation	ssr control-flow unmatched 404 (react)	67.2 ms	64.1 ms	+4.82%
⚡	Simulation	ssr request loop (solid)	158 ms	152 ms	+3.98%

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 bundlesize-load-client (78f53f3) with main (c568caf)}