perf(router-core): reuse idle match batch logic for fewer bytes

[Sheraff]

Summary by CodeRabbit

• Performance

  • Reduced package size by reusing match update batching logic.
  • Improved efficiency when restoring navigation state and hydrating the application.

• Bug Fixes

  • Improved consistency when updating loading status and resolved location during refresh rollback and hydration.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit b37cab6

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	❌ Failed	11m 13s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	2m 12s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-08-09 21:05:16 UTC

[github-actions]

🚀 Changeset Version Preview

1 package(s) bumped directly, 22 bumped as dependents.

🟩 Patch bumps

Package	Version	Reason
@tanstack/router-core	1.171.21 → 1.171.22	Changeset
@tanstack/react-router	1.170.25 → 1.170.26	Dependent
@tanstack/react-start	1.168.42 → 1.168.43	Dependent
@tanstack/react-start-client	1.168.23 → 1.168.24	Dependent
@tanstack/react-start-rsc	0.1.41 → 0.1.42	Dependent
@tanstack/react-start-server	1.167.30 → 1.167.31	Dependent
@tanstack/router-cli	1.167.27 → 1.167.28	Dependent
@tanstack/router-generator	1.167.27 → 1.167.28	Dependent
@tanstack/router-plugin	1.168.29 → 1.168.30	Dependent
@tanstack/router-vite-plugin	1.167.29 → 1.167.30	Dependent
@tanstack/solid-router	1.170.24 → 1.170.25	Dependent
@tanstack/solid-start	1.168.41 → 1.168.42	Dependent
@tanstack/solid-start-client	1.168.23 → 1.168.24	Dependent
@tanstack/solid-start-server	1.167.30 → 1.167.31	Dependent
@tanstack/start-client-core	1.170.21 → 1.170.22	Dependent
@tanstack/start-plugin-core	1.171.33 → 1.171.34	Dependent
@tanstack/start-server-core	1.169.25 → 1.169.26	Dependent
@tanstack/start-static-server-functions	1.167.26 → 1.167.27	Dependent
@tanstack/start-storage-context	1.167.23 → 1.167.24	Dependent
@tanstack/vue-router	1.170.23 → 1.170.24	Dependent
@tanstack/vue-start	1.168.40 → 1.168.41	Dependent
@tanstack/vue-start-client	1.167.26 → 1.167.27	Dependent
@tanstack/vue-start-server	1.167.30 → 1.167.31	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: 4adfba33-ac3c-431b-858f-c042c2ee3fe6

📥 Commits

Reviewing files that changed from the base of the PR and between 91a848e and bb7f463.

📒 Files selected for processing (2)

• .changeset/good-plums-doubt.md
• packages/router-core/src/load-client.ts

---

📝 Walkthrough

Walkthrough

load-client.ts centralizes idle match updates in setIdleMatches. Refresh rollback, transaction restoration, and hydration now use this helper. A patch changeset records the @tanstack/router-core release.

Changes

Idle match publication

Layer / File(s)	Summary
Shared idle match update flow packages/router-core/src/load-client.ts, .changeset/good-plums-doubt.md	setIdleMatches batches match publication and idle status updates. Refresh rollback, transaction restoration, and hydration use the helper. Hydration can also synchronize the resolved location when client loading is skipped. The changeset declares a patch release.

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

🚥 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 and concisely describes the main change: reusing idle match batch logic 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 perf-router-core-reuse-idle-match-batch

---

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[github-actions]

Bundle Size Benchmarks

• Commit: c03538217be0
• Measured at: 2026-08-09T20:55:13.027Z
• Baseline source: history:91a848e979ac
• 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	83.95 KiB	+25 B (+0.03%)	83.81 KiB	262.77 KiB	73.16 KiB	████▁▁▁▁▁▁▁▁
react-router.full	87.46 KiB	+25 B (+0.03%)	87.32 KiB	274.48 KiB	76.12 KiB	████▁▁▁▁▁▁▁▁
solid-router.minimal	33.26 KiB	+19 B (+0.06%)	33.14 KiB	96.60 KiB	30.03 KiB	████▁▁▁▁▁▁▁▁
solid-router.full	38.09 KiB	+20 B (+0.05%)	37.96 KiB	111.23 KiB	34.32 KiB	████▁▁▁▁▁▁▁▁
vue-router.minimal	49.55 KiB	+25 B (+0.05%)	49.42 KiB	138.34 KiB	44.73 KiB	████▁▁▁▁▁▁▁▁
vue-router.full	55.12 KiB	+19 B (+0.03%)	55.00 KiB	156.52 KiB	49.65 KiB	████▁▁▁▁▁▁▁▁
react-start.minimal	96.76 KiB	+1 B (+0.00%)	96.62 KiB	304.86 KiB	83.88 KiB	████▁▁▁▁▁▁▁▁
react-start.deferred-hydration	97.48 KiB	-5 B (-0.01%)	96.64 KiB	306.22 KiB	84.42 KiB	████▁▁▁▁▁▁▁▁
react-start.full	99.91 KiB	-14 B (-0.01%)	99.78 KiB	314.58 KiB	86.68 KiB	████▁▁▁▁▁▁▁▁
react-start.rsbuild.minimal	100.08 KiB	+13 B (+0.01%)	99.91 KiB	315.42 KiB	86.27 KiB	▁▁▂▂▂▂▅▇▇▇▇█
react-start.rsbuild.minimal-iife	100.49 KiB	+14 B (+0.01%)	100.32 KiB	316.35 KiB	86.65 KiB	▁▁▂▂▂▂▅▇▇▇▇█
react-start.rsbuild.full	103.39 KiB	-1 B (-0.00%)	103.22 KiB	325.51 KiB	88.97 KiB	▁▁▃▃▃▃▆█████
solid-start.minimal	46.02 KiB	+9 B (+0.02%)	45.89 KiB	137.55 KiB	40.87 KiB	████▁▁▁▁▁▁▁▁
solid-start.deferred-hydration	49.10 KiB	+7 B (+0.01%)	45.96 KiB	145.01 KiB	43.74 KiB	████▁▁▁▁▁▁▁▁
solid-start.full	51.09 KiB	-1 B (-0.00%)	50.97 KiB	152.93 KiB	45.32 KiB	████▁▁▁▁▁▁▁▁
vue-start.minimal	65.55 KiB	+7 B (+0.01%)	65.43 KiB	189.06 KiB	58.39 KiB	████▁▁▁▁▁▁▁▁
vue-start.full	69.37 KiB	-10 B (-0.01%)	69.24 KiB	201.33 KiB	61.64 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: bb7f463

[codspeed-hq]

Merging this PR will regress 2 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
❌ 2 regressed benchmarks
✅ 172 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 redirect (solid)	288.7 KB	403.5 KB	-28.47%
❌	Memory	mem server error-paths redirect (vue)	294.9 KB	372.5 KB	-20.83%
⚡	Memory	mem server error-paths not-found (solid)	658 KB	411.6 KB	+59.88%
⚡	Memory	mem client navigation-churn (solid)	665.6 KB	616 KB	+8.05%
⚡	Simulation	client-history navigation loop (react)	40 ms	37.1 ms	+7.75%
⚡	Memory	mem client unique-location-churn (vue)	1.3 MB	1.2 MB	+4.99%
⚡	Memory	mem server server-fn-churn (solid)	275 KB	264.6 KB	+3.96%
⚡	Memory	mem server error-paths unmatched (react)	272.1 KB	263.5 KB	+3.27%

Tip

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

---

_{Comparing perf-router-core-reuse-idle-match-batch (bb7f463) with main (91a848e)}

[nx-cloud]

Nx Cloud is proposing a fix for your failed CI:

We updated the setIdleMatches function signature in load-client.ts to use Array<AnyRouteMatch> instead of AnyRouteMatch[], which fixes the @typescript-eslint/array-type ESLint error introduced by this PR. Our change aligns with the project's enforced generic array syntax rule while preserving the full intent of the refactor. No logic was altered — only the type annotation syntax was corrected.

Tip

✅ We verified this fix by re-running @tanstack/router-core:test:eslint.

diff --git a/packages/router-core/src/load-client.ts b/packages/router-core/src/load-client.ts
index a56c5570..131ac76e 100644
--- a/packages/router-core/src/load-client.ts
+++ b/packages/router-core/src/load-client.ts
@@ -2630,7 +2630,7 @@ export async function hydrate(router: AnyRouter): Promise<void> {
 
 function setIdleMatches(
   router: AnyRouter,
-  matches: AnyRouteMatch[],
+  matches: Array<AnyRouteMatch>,
   skipClientLoad?: boolean,
 ) {
   router.batch(() => {

  

Or Apply changes locally with:

npx nx-cloud apply-locally xOEV-bEpW

Apply fix locally with your editor ↗   View interactive diff ↗

_{🎓 Learn more about Self-Healing CI on nx.dev}