refactor(react-router): Reduce bundle size by sharing hook structuralSharing logic

[Sheraff]

Summary by CodeRabbit

• Refactor
  • Optimized bundle size of @tanstack/react-router by consolidating structural sharing logic across routing hooks, eliminating code duplication and improving package efficiency while maintaining full backward compatibility and identical user-facing functionality.

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR consolidates duplicated structural-sharing logic across four React Router hooks (useMatch, useMatches, useLocation, useRouterState) into a single reusable useStructuralSharing hook, reducing code duplication and bundle size. Each consumer hook now delegates selection and structural-sharing behavior to this centralized helper.

Changes

Structural Sharing Refactoring

Layer / File(s)	Summary
Extract useStructuralSharing hook and refactor useMatch packages/react-router/src/useMatch.tsx	Introduces exported useStructuralSharing hook that memoizes previous selected values and conditionally applies replaceEqualDeep for structural sharing. useMatch is refactored to use this hook, simplifying match store resolution and delegating selection/structural-sharing logic instead of inlining it.
Refactor useMatches, useLocation, and useRouterState packages/react-router/src/Matches.tsx, packages/react-router/src/useLocation.tsx, packages/react-router/src/useRouterState.tsx	Each hook imports useStructuralSharing from ./useMatch and passes the result to useStore, replacing prior inline useRef + replaceEqualDeep patterns. Removes structural-sharing logic duplication across three hooks.
Release notes for structural sharing consolidation .changeset/silent-ghosts-sit.md	Changeset documents @tanstack/react-router patch release with bundle-size reduction claim from consolidating structural-sharing selector logic.

Estimated Code Review Effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly Related PRs

• TanStack/router#7575: Directly related modification of useMatches client-side structural-sharing logic around useRef/previousResult handling for SSR compatibility.
• TanStack/router#7503: E2E test app updates that depend on the refactored useRouterState structural-sharing and selection logic.

Suggested Labels

package: react-router

Suggested Reviewers

• schiller-manuel

Poem

🐰 A helper hook to share the load,
Four hooks walk a cleaner road,
Refs and deep-checks unified,
Bundle slim, complexity tied!
Rabbit cheers this tidy tide. 🎉

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 60.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main refactoring: extracting shared useStructuralSharing logic from multiple hooks to reduce bundle size.
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.

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✨ 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 refactor-react-router-hook-selector-bundle-size

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☁️ Nx Cloud last updated this comment at 2026-06-07 12:32:29 UTC

[github-actions]

🚀 Changeset Version Preview

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

🟩 Patch bumps

Package	Version	Reason
@tanstack/react-router	1.170.15 → 1.170.16	Changeset
@tanstack/react-start	1.168.25 → 1.168.26	Dependent
@tanstack/react-start-client	1.168.13 → 1.168.14	Dependent
@tanstack/react-start-rsc	0.1.24 → 0.1.25	Dependent
@tanstack/react-start-server	1.167.19 → 1.167.20	Dependent

[github-actions]

Bundle Size Benchmarks

• Commit: 424efd817c32
• Measured at: 2026-06-07T12:04:33.125Z
• Baseline source: history:4a93cffffca3
• Dashboard: bundle-size history

Scenario	Current (gzip)	Delta vs baseline	Initial gzip	Raw	Brotli	Trend
react-router.minimal	87.25 KiB	-2 B (-0.00%)	87.11 KiB	273.66 KiB	75.83 KiB	▁▁▁███▃▃▃▃▃▃
react-router.full	90.98 KiB	-103 B (-0.11%)	90.84 KiB	285.55 KiB	79.04 KiB	▄▄▄███▇▇▇▇▇▁
solid-router.minimal	35.49 KiB	0 B (0.00%)	35.36 KiB	105.96 KiB	32.00 KiB	▁▁▁▆▆▆█████
solid-router.full	40.54 KiB	0 B (0.00%)	40.41 KiB	121.17 KiB	36.49 KiB	▁▁▁███▆▆▆▆▆
vue-router.minimal	52.97 KiB	0 B (0.00%)	52.84 KiB	149.97 KiB	47.65 KiB	▁▁▁████████
vue-router.full	58.95 KiB	0 B (0.00%)	58.82 KiB	168.73 KiB	52.81 KiB	▁▁▁███▇▇▇▇▇
react-start.minimal	101.88 KiB	0 B (0.00%)	101.74 KiB	321.97 KiB	88.08 KiB	▁▁▁███▇▇▇▇▇
react-start.deferred-hydration	102.62 KiB	+8 B (+0.01%)	101.76 KiB	323.35 KiB	88.80 KiB	▁▁▁███▅▅▅▅▅█
react-start.full	105.27 KiB	-60 B (-0.06%)	105.13 KiB	331.91 KiB	91.12 KiB	▁▁▁▅▅▅▅▅███▃
react-start.rsbuild.minimal	99.58 KiB	-17 B (-0.02%)	99.41 KiB	316.42 KiB	85.71 KiB	▁▁▁▆▆▆█████▄
react-start.rsbuild.minimal-iife	99.98 KiB	-14 B (-0.01%)	99.82 KiB	317.35 KiB	86.11 KiB	▁▁▁▆▆▆█████▅
react-start.rsbuild.full	102.81 KiB	-84 B (-0.08%)	102.64 KiB	326.47 KiB	88.41 KiB	▃▃▃▄▄▄▅▅███▁
solid-start.minimal	49.60 KiB	0 B (0.00%)	49.47 KiB	152.02 KiB	43.81 KiB	▁▁▁▆▆▆█████
solid-start.deferred-hydration	52.86 KiB	0 B (0.00%)	49.53 KiB	160.06 KiB	46.77 KiB	▁▁▁▆▆▆█████
solid-start.full	55.41 KiB	0 B (0.00%)	55.28 KiB	169.07 KiB	48.79 KiB	▁▁▁▄▄▄▂▂███
vue-start.minimal	71.01 KiB	0 B (0.00%)	70.89 KiB	207.11 KiB	62.92 KiB	▁▁▁████████
vue-start.full	75.01 KiB	0 B (0.00%)	74.88 KiB	219.75 KiB	66.39 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: a1d2860

[coderabbitai]

🧹 Nitpick comments (1)

packages/react-router/src/useMatch.tsx (1)

30-67: Make useStructuralSharing truly internal

useStructuralSharing is exported from packages/react-router/src/useMatch.tsx, but it’s not re-exported from the public entrypoint (packages/react-router/src/index.tsx), and packages/react-router/package.json only exposes . and ./ssr/*. If it’s only for intra-package reuse, consider making it non-exported (or moving it to a private helper module) to avoid implying a public API surface.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@packages/react-router/src/useMatch.tsx` around lines 30 - 67, The function
useStructuralSharing is currently exported from useMatch.tsx but is intended as
an internal helper; remove the export (make it a module-private function) or
move it into a private helper file and update internal imports so it is not part
of the package public surface (adjust any internal references to
useStructuralSharing accordingly and ensure the symbol is no longer exported
from the package entrypoint).

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In `@packages/react-router/src/useMatch.tsx`:
- Around line 30-67: The function useStructuralSharing is currently exported
from useMatch.tsx but is intended as an internal helper; remove the export (make
it a module-private function) or move it into a private helper file and update
internal imports so it is not part of the package public surface (adjust any
internal references to useStructuralSharing accordingly and ensure the symbol is
no longer exported from the package entrypoint).

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f0782a0b-f3d0-498c-ae83-a3d7c64459d3

📥 Commits

Reviewing files that changed from the base of the PR and between 4a93cff and a1d2860.

📒 Files selected for processing (5)

• .changeset/silent-ghosts-sit.md
• packages/react-router/src/Matches.tsx
• packages/react-router/src/useLocation.tsx
• packages/react-router/src/useMatch.tsx
• packages/react-router/src/useRouterState.tsx

[nx-cloud]

Important

At least one additional CI pipeline execution has run since the conclusion below was written and it may no longer be applicable.

Nx Cloud has identified a possible root cause for your failed CI:

We determined this failure is unrelated to the PR changes, which only refactor structural sharing logic within @tanstack/react-router hooks. The error originates in a compiled artifact of e2e-utils (dist/esm/users.js missing a named export), a package untouched by this PR. Our classification is environment_state — the e2e-utils dist files need to be rebuilt in the environment.

No code changes were suggested for this issue.

Trigger a rerun:

View detailed reasoning on Nx Cloud ↗

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

[codspeed-hq]

Merging this PR will improve performance by 5.9%

⚠️ 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

⚡ 1 improved benchmark
✅ 4 untouched benchmarks
⏩ 1 skipped benchmark¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	ssr request loop (vue)	481.7 ms	454.9 ms	+5.9%

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 refactor-react-router-hook-selector-bundle-size (a1d2860) with main (4a93cff)}

Footnotes

1. 1 benchmark was skipped, so the baseline result was used instead. If it was deleted from the codebase, click here and archive it to remove it from the performance reports. ↩