perf(router-core): inline buildWithMatches inside buildLocation

[Sheraff]

Summary by CodeRabbit

• Bug Fixes

  • Explicit route masks now take precedence over configured route masks.
  • Masked locations are generated more consistently when building navigation destinations.
  • Navigation paths now reflect explicitly requested masking behavior more reliably.

• Tests

  • Added coverage confirming explicit masks are used without evaluating configured mask parameters.

• Chores

  • Included a patch release note for the router core package.
  • Reduced internal processing overhead when constructing navigation locations.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit f95b57c

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	12m 57s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	2m	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-08-14 19:50:38 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: 220bd15b-da4b-460d-b832-06006903b9a9

📥 Commits

Reviewing files that changed from the base of the PR and between 329e655 and f95b57c.

📒 Files selected for processing (1)

• packages/router-core/src/router.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• packages/router-core/src/router.ts

---

📝 Walkthrough

Walkthrough

buildLocation now resolves location masks inline instead of using buildWithMatches. Explicit masks take precedence over configured route masks. Tests cover this behavior, and a patch Changeset was added.

Changes

Location mask handling

Layer / File(s)	Summary
Inline mask resolution and precedence packages/router-core/src/router.ts, packages/router-core/tests/mask.test.ts, .changeset/whole-bars-smash.md	buildLocation resolves explicit and configured route masks inline. Tests verify explicit mask precedence and callback omission. A patch Changeset records the implementation change.

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

Merge Risk: ⚪ Minimal · up to f95b5

This localized performance refactor is merge-ready after normal checks and review; no actionable merge-blocking risk remains.

Possibly related PRs

• TanStack/router#7897: Both changes modify RouterCore.buildLocation and route-mask handling.

🚥 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: inlining buildWithMatches inside buildLocation for router-core performance.
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-inline-build-with-matches

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commit: f95b57c

[github-actions]

Bundle Size Benchmarks

• Commit: e62db5430a21
• Measured at: 2026-08-14T19:38:48.939Z
• Baseline source: history:53b63cf6fbec
• 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	83.84 KiB	-58 B (-0.07%)	83.71 KiB	262.47 KiB	72.93 KiB	██▁▁▁▁▁▁▆▆▄▁
react-router.full	87.33 KiB	-67 B (-0.07%)	87.19 KiB	274.18 KiB	76.01 KiB	██▂▂▂▂▂▃▆▆▃▁
solid-router.minimal	33.12 KiB	-69 B (-0.20%)	32.99 KiB	96.12 KiB	29.85 KiB	██▄▄▄▄▅▅▅▅▃▁
solid-router.full	37.94 KiB	-64 B (-0.16%)	37.82 KiB	110.76 KiB	34.17 KiB	██▄▄▄▄▄▄▄▄▃▁
vue-router.minimal	49.50 KiB	-89 B (-0.18%)	49.38 KiB	138.30 KiB	44.69 KiB	▄▄▁▁▁█▇███▅▃
vue-router.full	55.11 KiB	-88 B (-0.16%)	54.99 KiB	156.50 KiB	49.61 KiB	▄▄▁▁▁█████▆▄
react-start.minimal	96.64 KiB	-83 B (-0.08%)	96.50 KiB	304.69 KiB	83.66 KiB	██▂▂▂▂▂▂▆▆▃▁
react-start.deferred-hydration	97.37 KiB	-76 B (-0.08%)	96.53 KiB	306.05 KiB	84.48 KiB	██▂▂▂▂▂▁▆▆▃▁
react-start.full	99.80 KiB	-95 B (-0.09%)	99.67 KiB	314.42 KiB	86.49 KiB	██▃▃▃▃▃▃▆▆▃▁
react-start.rsbuild.minimal	99.98 KiB	-53 B (-0.05%)	99.81 KiB	315.07 KiB	86.19 KiB	██▁▁▁▁▁▁▅▅▅▂
react-start.rsbuild.minimal-iife	100.38 KiB	-53 B (-0.05%)	100.22 KiB	316.01 KiB	86.59 KiB	██▁▁▁▁▁▁▆▆▅▂
react-start.rsbuild.full	103.30 KiB	-55 B (-0.05%)	103.13 KiB	325.17 KiB	88.97 KiB	██▁▁▁▁▁▁▅▅▅▂
solid-start.minimal	45.87 KiB	-91 B (-0.19%)	45.74 KiB	137.18 KiB	40.84 KiB	██▅▅▅▅▅▅▅▅▃▁
solid-start.deferred-hydration	48.95 KiB	-81 B (-0.16%)	45.82 KiB	144.64 KiB	43.60 KiB	██▄▄▄▅▅▅▅▅▃▁
solid-start.full	50.97 KiB	-71 B (-0.14%)	50.84 KiB	152.57 KiB	45.19 KiB	██▄▄▄▅▅▅▅▅▃▁
vue-start.minimal	65.56 KiB	-79 B (-0.12%)	65.44 KiB	189.12 KiB	58.33 KiB	▄▄▁▁▁█████▆▅
vue-start.full	69.38 KiB	-73 B (-0.10%)	69.25 KiB	201.42 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.

[codspeed-hq]

Merging this PR will degrade performance by 8.24%

⚠️ 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

⚡ 8 improved benchmarks
❌ 13 (👁 13) regressed benchmarks
✅ 159 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	mem server error-paths unmatched (vue)	625 KB	583.9 KB	+7.04%
⚡	Simulation	client-search-params navigation loop (react)	177.3 ms	168.4 ms	+5.31%
⚡	Simulation	client-async-pipeline navigation loop (react)	103.9 ms	99.4 ms	+4.58%
⚡	Memory	mem server aborted-requests (solid)	1.3 MB	1.2 MB	+4.27%
⚡	Memory	mem server server-fn-churn (vue)	340.7 KB	328.1 KB	+3.86%
⚡	Simulation	ssr request loop (solid)	446.1 ms	429.8 ms	+3.79%
👁	Simulation	ssr control-flow error 500 (react)	229.1 ms	240.4 ms	-4.7%
👁	Simulation	ssr control-flow route headers (react)	296.1 ms	311.6 ms	-5%
👁	Memory	mem server error-paths redirect (solid)	379.7 KB	392.8 KB	-3.32%
👁	Memory	mem server error-paths unmatched (solid)	541.8 KB	574.6 KB	-5.71%
👁	Memory	mem server peak-large-page (solid)	1.1 MB	1.1 MB	-5.07%
👁	Memory	mem server error-paths not-found (react)	382 KB	431.7 KB	-11.52%
👁	Memory	mem server error-paths redirect (react)	305.5 KB	320.9 KB	-4.8%
👁	Memory	mem server peak-large-page (react)	1.1 MB	2.3 MB	-50.04%
👁	Memory	mem server server-fn-churn (react)	376.3 KB	395.9 KB	-4.94%
👁	Memory	mem server aborted-requests (vue)	1 MB	1.1 MB	-3.84%
👁	Memory	mem server error-paths error (vue)	940.9 KB	2,301 KB	-59.11%
👁	Simulation	client-nested-params navigation loop (react)	212.8 ms	228.1 ms	-6.7%
👁	Memory	mem client preload-churn (vue)	758.5 KB	884.8 KB	-14.27%
👁	Memory	mem client unique-location-churn (vue)	614.2 KB	546.3 KB	+12.43%
...	...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

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 perf-router-core-inline-build-with-matches (f95b57c) with main (cf6ab17)}