fix(router): reuse resolved lazy route components

[Sheraff]

Summary

• skip client preload work after a lazy route component has already resolved
• preserve SSR promise reuse and failed-import retry behavior across React, Solid, and Vue
• add unit coverage and a React Start painted-state regression fixture for route revisits

Testing

• CI=1 NX_DAEMON=false pnpm nx run @tanstack/react-router:test:unit --outputStyle=stream --skipRemoteCache -- tests/component-preload-retry.test.tsx
• CI=1 NX_DAEMON=false pnpm nx run @tanstack/solid-router:test:unit --outputStyle=stream --skipRemoteCache
• CI=1 NX_DAEMON=false pnpm nx run @tanstack/vue-router:test:unit --outputStyle=stream --skipRemoteCache -- tests/component-preload-retry.test.tsx
• CI=1 NX_DAEMON=false pnpm nx run-many --target=test:types --projects=@tanstack/router-core,@tanstack/react-router,@tanstack/solid-router,@tanstack/vue-router --outputStyle=stream --skipRemoteCache
• CI=1 NX_DAEMON=false pnpm nx run-many --target=test:eslint --projects=@tanstack/router-core,@tanstack/react-router,@tanstack/solid-router,@tanstack/vue-router --outputStyle=stream --skipRemoteCache
• CI=1 pnpm test:e2e in e2e/react-start/issue-8049
• pnpm build in e2e/react-start/issue-8049

Fixes #8049

Summary by CodeRabbit

• Bug Fixes

  • Improved lazy-loaded route navigation across React, Solid, and Vue applications.
  • Previously loaded route components are now reused when revisiting code-split pages.
  • Prevented unnecessary loading indicators, pending states, or blank content during navigation.
  • Preserved server-side loading behavior while avoiding duplicate client-side requests.

• Tests

  • Added regression coverage confirming resolved components load only once and remain visible during subsequent navigation.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 8d93118

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	6m 56s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	37s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-08-12 15:04:26 UTC

[github-actions]

🚀 Changeset Version Preview

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

🟩 Patch bumps

Package	Version	Reason
@tanstack/react-router	1.170.27 → 1.170.28	Changeset
@tanstack/router-core	1.171.22 → 1.171.23	Changeset
@tanstack/solid-router	1.170.25 → 1.170.26	Changeset
@tanstack/vue-router	1.170.24 → 1.170.25	Changeset
@tanstack/react-start	1.168.44 → 1.168.45	Dependent
@tanstack/react-start-client	1.168.25 → 1.168.26	Dependent
@tanstack/react-start-rsc	0.1.43 → 0.1.44	Dependent
@tanstack/react-start-server	1.167.32 → 1.167.33	Dependent
@tanstack/router-cli	1.167.28 → 1.167.29	Dependent
@tanstack/router-generator	1.167.28 → 1.167.29	Dependent
@tanstack/router-plugin	1.168.30 → 1.168.31	Dependent
@tanstack/router-vite-plugin	1.167.30 → 1.167.31	Dependent
@tanstack/solid-start	1.168.42 → 1.168.43	Dependent
@tanstack/solid-start-client	1.168.24 → 1.168.25	Dependent
@tanstack/solid-start-server	1.167.31 → 1.167.32	Dependent
@tanstack/start-client-core	1.170.22 → 1.170.23	Dependent
@tanstack/start-plugin-core	1.171.34 → 1.171.35	Dependent
@tanstack/start-server-core	1.169.26 → 1.169.27	Dependent
@tanstack/start-static-server-functions	1.167.27 → 1.167.28	Dependent
@tanstack/start-storage-context	1.167.24 → 1.167.25	Dependent
@tanstack/vue-start	1.168.41 → 1.168.42	Dependent
@tanstack/vue-start-client	1.167.27 → 1.167.28	Dependent
@tanstack/vue-start-server	1.167.31 → 1.167.32	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: 6adb7b87-ea6a-45ba-baae-d75543523483

📥 Commits

Reviewing files that changed from the base of the PR and between 6c4edd5 and 8d93118.

📒 Files selected for processing (2)

• packages/vue-router/src/lazyRouteComponent.tsx
• packages/vue-router/tests/component-preload-retry.test.tsx

---

📝 Walkthrough

Walkthrough

The change reuses resolved client-side lazy route components during preload. React, Solid, and Vue router types accept undefined preload results. Tests cover repeated preloads and route revisits without pending UI.

Changes

Lazy route preload reuse

Layer / File(s)	Summary
React preload contract and reuse packages/router-core/src/route.ts, packages/react-router/src/..., packages/react-router/tests/component-preload-retry.test.tsx	React lazy route components skip loading when already resolved. Preload types allow undefined. Tests cover repeated preload calls and revisiting lazy routes without pending UI.
Solid and Vue preload parity packages/solid-router/src/..., packages/solid-router/tests/component-preload-retry.test.tsx, packages/vue-router/src/..., packages/vue-router/tests/component-preload-retry.test.tsx	Solid and Vue lazy route components reuse resolved client components. Vue retains resolved preload promises during SSR. Their preload types allow undefined.
React Start reproduction and E2E validation e2e/react-start/issue-8049/..., .changeset/fuzzy-pandas-smile.md	Adds a React Start fixture with home and test routes, router and build configuration, and a Playwright test that checks route revisits without pending, shell, or empty states. Adds patch release entries for the affected packages.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant Router
  participant LazyRouteComponent
  participant Importer
  User->>Router: Navigate to code-split route
  Router->>LazyRouteComponent: Preload route component
  LazyRouteComponent->>LazyRouteComponent: Check resolved client component
  alt Component already resolved
    LazyRouteComponent-->>Router: Return without importing
  else Component unresolved
    LazyRouteComponent->>Importer: Load component
    Importer-->>LazyRouteComponent: Resolve component
    LazyRouteComponent-->>Router: Complete preload
  end
  Router-->>User: Render route without pending flicker

Loading

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 20.00% 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 clearly summarizes the main change: reusing resolved lazy route components.
Linked Issues check	✅ Passed	The changes address issue #8049 by reusing resolved components and preventing pending UI when revisiting code-split routes.
Out of Scope Changes check	✅ Passed	The changeset, cross-framework fixes, tests, and React Start fixture directly support the lazy route reuse objective.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/issue-8049-lazy-route-revisit

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[github-actions]

Bundle Size Benchmarks

• Commit: a0083985394f
• Measured at: 2026-08-12T15:00:08.946Z
• Baseline source: history:38485038c52f
• 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	83.85 KiB	+6 B (+0.01%)	83.71 KiB	262.50 KiB	73.03 KiB	▆██████▁▁▁▁▂
react-router.full	87.36 KiB	+8 B (+0.01%)	87.22 KiB	274.21 KiB	76.12 KiB	▅█████▇▁▁▁▁▂
solid-router.minimal	33.18 KiB	+10 B (+0.03%)	33.06 KiB	96.29 KiB	29.88 KiB	▅██████▁▁▁▁▂
solid-router.full	38.00 KiB	+4 B (+0.01%)	37.88 KiB	110.92 KiB	34.17 KiB	▆██████▁▁▁▂▂
vue-router.minimal	49.59 KiB	+11 B (+0.02%)	49.47 KiB	138.48 KiB	44.77 KiB	▃▄▄▄▄▄▄▁▁▁▇█
vue-router.full	55.21 KiB	+22 B (+0.04%)	55.08 KiB	156.69 KiB	49.65 KiB	▂▄▄▄▄▄▄▁▁▁▇█
react-start.minimal	96.67 KiB	+7 B (+0.01%)	96.53 KiB	304.71 KiB	83.76 KiB	▄█████▇▁▁▁▁▂
react-start.deferred-hydration	97.39 KiB	+14 B (+0.01%)	96.55 KiB	306.07 KiB	84.38 KiB	▅█████▇▁▁▁▁▂
react-start.full	99.85 KiB	+12 B (+0.01%)	99.71 KiB	314.43 KiB	86.51 KiB	▄██████▁▁▁▁▂
react-start.rsbuild.minimal	99.98 KiB	+10 B (+0.01%)	99.80 KiB	315.13 KiB	86.24 KiB	▆██████▁▁▁▁▂
react-start.rsbuild.minimal-iife	100.38 KiB	+10 B (+0.01%)	100.21 KiB	316.06 KiB	86.62 KiB	▆██████▁▁▁▁▂
react-start.rsbuild.full	103.29 KiB	+8 B (+0.01%)	103.12 KiB	325.22 KiB	89.03 KiB	▆██████▁▁▁▁▂
solid-start.minimal	45.96 KiB	+5 B (+0.01%)	45.83 KiB	137.35 KiB	40.83 KiB	▅██████▁▁▁▂▂
solid-start.deferred-hydration	49.03 KiB	+7 B (+0.01%)	45.90 KiB	144.80 KiB	43.73 KiB	▄█████▇▁▁▁▂▂
solid-start.full	51.04 KiB	+6 B (+0.01%)	50.91 KiB	152.73 KiB	45.23 KiB	▄██████▁▁▁▂▃
vue-start.minimal	65.64 KiB	+12 B (+0.02%)	65.52 KiB	189.30 KiB	58.43 KiB	▃▄▄▄▄▄▄▁▁▁██
vue-start.full	69.45 KiB	+16 B (+0.02%)	69.33 KiB	201.61 KiB	61.66 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: 8d93118

[coderabbitai]

Actionable comments posted: 1

🤖 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.

Inline comments:
In `@packages/vue-router/src/lazyRouteComponent.tsx`:
- Around line 69-70: Update the preload logic around the preload function and
load so SSR retains the resolved loadPromise instead of invoking importer()
again; only clear the promise after successful browser-side loading, while
preserving unconditional clearing on rejection to allow failed-import retries.

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Fix all unresolved CodeRabbit comments on this PR:

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• Create a new PR with the fixes

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📥 Commits

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⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (21)

• .changeset/fuzzy-pandas-smile.md
• e2e/react-start/issue-8049/package.json
• e2e/react-start/issue-8049/playwright.config.ts
• e2e/react-start/issue-8049/src/routeTree.gen.ts
• e2e/react-start/issue-8049/src/router.tsx
• e2e/react-start/issue-8049/src/routes/__root.tsx
• e2e/react-start/issue-8049/src/routes/index.tsx
• e2e/react-start/issue-8049/src/routes/test.tsx
• e2e/react-start/issue-8049/tests/issue-8049.spec.ts
• e2e/react-start/issue-8049/tsconfig.json
• e2e/react-start/issue-8049/vite.config.ts
• packages/react-router/src/lazyRouteComponent.tsx
• packages/react-router/src/route.tsx
• packages/react-router/tests/component-preload-retry.test.tsx
• packages/router-core/src/route.ts
• packages/solid-router/src/lazyRouteComponent.tsx
• packages/solid-router/src/route.tsx
• packages/solid-router/tests/component-preload-retry.test.tsx
• packages/vue-router/src/lazyRouteComponent.tsx
• packages/vue-router/src/route.ts
• packages/vue-router/tests/component-preload-retry.test.tsx

[codspeed-hq]

Merging this PR will degrade performance by 5.02%

⚠️ 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

⚡ 12 improved benchmarks
❌ 13 regressed benchmarks
✅ 155 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)	467.2 KB	2,279.9 KB	-79.51%
❌	Memory	mem server peak-large-page (react)	1.2 MB	2.1 MB	-43.73%
❌	Memory	mem client unique-location-churn (solid)	346.5 KB	449.3 KB	-22.87%
❌	Memory	mem client unique-location-churn (react)	667.3 KB	757.6 KB	-11.92%
❌	Memory	mem client navigation-churn (vue)	1.5 MB	1.7 MB	-8.97%
❌	Simulation	client-nested-params navigation loop (react)	212.5 ms	228.4 ms	-6.99%
❌	Memory	mem client preload-churn (vue)	758.9 KB	802.1 KB	-5.39%
❌	Memory	mem client interrupted-navigations (vue)	435.8 KB	459.9 KB	-5.24%
❌	Memory	mem server peak-large-page (vue)	1 MB	1.1 MB	-4.93%
❌	Memory	mem server peak-large-page (solid)	1 MB	1.1 MB	-4.27%
❌	Memory	mem client navigation-churn (solid)	650.1 KB	672.4 KB	-3.32%
❌	Memory	mem server aborted-requests (vue)	1,012.4 KB	1,046.7 KB	-3.28%
❌	Memory	mem server error-paths error (vue)	945.3 KB	974.9 KB	-3.04%
⚡	Memory	mem server error-paths redirect (vue)	648.5 KB	401.6 KB	+61.48%
⚡	Memory	mem server error-paths not-found (solid)	911.2 KB	580.5 KB	+56.97%
⚡	Memory	mem server error-paths unmatched (react)	629.2 KB	435.7 KB	+44.41%
⚡	Memory	mem client unique-location-churn (vue)	576.1 KB	523.1 KB	+10.12%
⚡	Memory	mem server request-churn (react)	710.7 KB	666.5 KB	+6.62%
⚡	Simulation	client-route-tree-scale navigation loop (react)	172.3 ms	164.1 ms	+4.97%
⚡	Memory	mem server aborted-requests (solid)	1.2 MB	1.2 MB	+4.34%
...	...	...	...	...	...

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_{Comparing fix/issue-8049-lazy-route-revisit (8d93118) with main (3848503)}

[schiller-manuel]

can we please use data-testid instead of roles?

also, how does this assert that the pending component is NOT shown?

can we use faketimers and a defaultPendingMinMs > 0 and then check inbetween that the pending component (by id) is not visible?