fix(router): apply preload delay to viewport links

[Sheraff]

Fixes #8029

Summary

• apply preloadDelay to viewport link preloading in the React, Solid, and Vue adapters
• cancel delayed viewport preloads when links leave the viewport, observation stops, or link options change
• key viewport timers by stable per-link refs so observer callback identity changes cannot orphan pending work
• use the latest queued observer entry so brief exit/re-entry cycles delivered in one callback retain the existing delay
• inline the fixed { rootMargin: "100px" } configuration inside each adapter observer utility and remove its options parameter
• share delayed viewport and intent scheduling while preserving immediate touch preloads and cancelable focus/hover intent
• deduplicate repeated viewport observer notifications and document the updated behavior
• add React regression coverage for changing destinations while a viewport preload is pending
• add a patch changeset for all three router adapters

Testing

• pnpm nx run-many --target=test:unit --projects=@tanstack/react-router,@tanstack/solid-router,@tanstack/vue-router
• pnpm nx run-many --target=test:types --projects=@tanstack/router-core,@tanstack/react-router,@tanstack/solid-router,@tanstack/vue-router
• pnpm nx run-many --target=test:eslint --projects=@tanstack/router-core,@tanstack/react-router,@tanstack/solid-router,@tanstack/vue-router
• full 17-scenario bundle-size build

Bundle Size

Affected gzip fixtures remain effectively flat versus the base commit:

• React Router minimal/full: -2 B / -9 B
• Solid Router minimal/full: +5 B / +3 B
• Vue Router minimal/full: 0 B / -10 B

Summary by CodeRabbit

New Features

• Link preloading now supports configurable delays for viewport, focus, and hover triggers across React, Solid, and Vue routers.
• Touch-based intent preloading remains immediate.
• Duplicate preload requests are consolidated.

Bug Fixes

• Pending preloads are cancelled when links leave the viewport or interactions end.
• Disabled, external, and document-reload links no longer trigger preloading.

Documentation

• Clarified preload timing, cancellation, and trigger behavior in router guides and API references.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit dddc18d

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	✅ Succeeded	12m 15s	View ↗
nx run-many --target=build --exclude=examples/*...	✅ Succeeded	1m 32s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-08-12 07:16:08 UTC

[github-actions]

🚀 Changeset Version Preview

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

🟩 Patch bumps

Package	Version	Reason
@tanstack/react-router	1.170.25 → 1.170.26	Changeset
@tanstack/router-core	1.171.21 → 1.171.22	Changeset
@tanstack/solid-router	1.170.24 → 1.170.25	Changeset
@tanstack/vue-router	1.170.23 → 1.170.24	Changeset
@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-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-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

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📝 Walkthrough

Walkthrough

The React, Solid, and Vue routers now delay viewport preloading with preloadDelay. Shared scheduling handles intent and viewport events, cancellation, duplicate suppression, and disabled links. Tests and documentation cover the updated behavior.

Changes

Link preloading

Layer / File(s)	Summary
Shared preload scheduling packages/react-router/src/link.tsx, packages/solid-router/src/link.tsx, packages/vue-router/src/link.tsx	The routers use enqueuePreload for viewport and intent events. Delayed work is cancelled on leave, duplicate timers are suppressed, disabled links do not preload, and touch intent remains immediate.
Observer handling and test control packages/*-router/src/utils.ts, packages/*-router/tests/link.test.tsx, packages/*-router/tests/utils.ts	Observer utilities use a fixed root margin and dispatch the last entry. Observer mocks expose callbacks for direct simulation. Tests cover delay timing, intersection filtering, cancellation, duplicate events, and brief hover interactions.
Preload delay contracts and release metadata packages/router-core/src/*, docs/router/api/router/*, docs/router/guide/*, .changeset/tidy-links-wait.md	Documentation describes delayed focus, hover, and viewport preloading, immediate touch intent preloading, cancellation behavior, and the related patch releases.

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

Possibly related PRs

• TanStack/router#7949: Updates related preloadDelay and intent-preloading documentation.
• TanStack/router#7952: Modifies related React link-preloading logic.
• TanStack/router#7971: Modifies related intersection-observer and link-preloading behavior across the router packages.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% 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
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes applying preload delay to viewport links, which is the main change in the pull request.

✨ 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/viewport-preload-delay

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[github-actions]

Bundle Size Benchmarks

• Commit: 88f982c33d34
• Measured at: 2026-08-12T07:04:44.634Z
• Baseline source: history:7e93431ae9ff
• 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	83.91 KiB	-4 B (-0.00%)	83.78 KiB	262.65 KiB	73.12 KiB	██▁▁▁▁▁▁▁▁▁▁
react-router.full	87.42 KiB	-6 B (-0.01%)	87.28 KiB	274.36 KiB	76.17 KiB	██▁▁▁▁▁▁▁▁▁▁
solid-router.minimal	33.24 KiB	+2 B (+0.01%)	33.11 KiB	96.46 KiB	30.03 KiB	██▁▁▁▁▁▁▁▁▁▁
solid-router.full	38.06 KiB	-3 B (-0.01%)	37.94 KiB	111.09 KiB	34.29 KiB	██▁▁▁▁▁▁▁▁▁▁
vue-router.minimal	49.51 KiB	-7 B (-0.01%)	49.39 KiB	138.25 KiB	44.71 KiB	██▁▁▁▁▁▁▁▁▁▁
vue-router.full	55.08 KiB	-20 B (-0.04%)	54.96 KiB	156.43 KiB	49.56 KiB	██▁▁▁▁▁▁▁▁▁▁
react-start.minimal	96.75 KiB	-3 B (-0.00%)	96.61 KiB	304.86 KiB	83.95 KiB	██▁▁▁▁▁▁▁▁▁▁
react-start.deferred-hydration	97.46 KiB	-13 B (-0.01%)	96.62 KiB	306.22 KiB	84.44 KiB	██▁▁▁▁▁▁▁▁▁▁
react-start.full	99.91 KiB	-9 B (-0.01%)	99.77 KiB	314.58 KiB	86.61 KiB	██▁▁▁▁▁▁▁▁▁▁
react-start.rsbuild.minimal	100.05 KiB	-15 B (-0.01%)	99.88 KiB	315.29 KiB	86.29 KiB	▁▁▁▁▆██████▆
react-start.rsbuild.minimal-iife	100.45 KiB	-15 B (-0.01%)	100.29 KiB	316.22 KiB	86.65 KiB	▁▁▁▁▅██████▆
react-start.rsbuild.full	103.38 KiB	-12 B (-0.01%)	103.21 KiB	325.38 KiB	89.01 KiB	▁▁▁▁▅██████▇
solid-start.deferred-hydration	49.10 KiB	+16 B (+0.03%)	45.96 KiB	144.98 KiB	43.69 KiB	██▁▁▁▁▁▁▁▁▁▁
solid-start.full	51.10 KiB	+13 B (+0.02%)	50.98 KiB	152.91 KiB	45.28 KiB	██▁▁▁▁▁▁▁▁▁▁
vue-start.minimal	65.54 KiB	-2 B (-0.00%)	65.41 KiB	189.07 KiB	58.37 KiB	██▁▁▁▁▁▁▁▁▁▁
vue-start.full	69.36 KiB	-3 B (-0.00%)	69.24 KiB	201.35 KiB	61.60 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: dddc18d

[coderabbitai]

Actionable comments posted: 2

🤖 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/react-router/src/link.tsx`:
- Around line 648-653: Ensure delayed preload timers recheck current eligibility
before invoking doPreload: in packages/react-router/src/link.tsx (648-653),
store the latest eligible preload mode in a ref or cancel timers when
eligibility changes; in packages/solid-router/src/link.tsx (279-285),
re-evaluate preload(); and in packages/vue-router/src/link.tsx (275-281),
re-evaluate preload.value. Disabled links and links with reloadDocument enabled
must not preload.
- Line 738: Wrap the return in the touch-intent preload condition with curly
braces in the relevant link logic: update packages/react-router/src/link.tsx at
lines 738-738, packages/solid-router/src/link.tsx at lines 373-373, and
packages/vue-router/src/link.tsx at lines 347-347, preserving the existing
condition and return behavior.

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ℹ️ Review info

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Review profile: CHILL

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Run ID: 2431d791-7134-4f46-bd10-bc9d4dc2850c

📥 Commits

Reviewing files that changed from the base of the PR and between 7e93431 and d44878d.

📒 Files selected for processing (16)

• .changeset/tidy-links-wait.md
• docs/router/api/router/LinkOptionsType.md
• docs/router/api/router/RouterOptionsType.md
• docs/router/guide/navigation.md
• docs/router/guide/preloading.md
• packages/react-router/src/link.tsx
• packages/react-router/tests/link.test.tsx
• packages/react-router/tests/utils.ts
• packages/router-core/src/link.ts
• packages/router-core/src/router.ts
• packages/solid-router/src/link.tsx
• packages/solid-router/tests/link.test.tsx
• packages/solid-router/tests/utils.ts
• packages/vue-router/src/link.tsx
• packages/vue-router/tests/link.test.tsx
• packages/vue-router/tests/utils.ts

[codspeed-hq]

Merging this PR will degrade performance by 6.47%

⚠️ 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

⚡ 3 improved benchmarks
❌ 7 (👁 7) regressed benchmarks
✅ 170 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	mem server error-paths not-found (vue)	777.5 KB	481.3 KB	+61.54%
⚡	Memory	mem server error-paths not-found (react)	414.1 KB	397.3 KB	+4.22%
⚡	Memory	mem server error-paths error (react)	1,020.9 KB	989 KB	+3.22%
👁	Memory	mem server error-paths redirect (vue)	405.6 KB	421.3 KB	-3.72%
👁	Memory	mem server error-paths not-found (solid)	569.9 KB	783.9 KB	-27.29%
👁	Memory	mem server error-paths redirect (solid)	379.9 KB	392.4 KB	-3.19%
👁	Memory	mem server peak-large-page (react)	1.2 MB	2.3 MB	-49.99%
👁	Memory	mem client preload-churn (vue)	759.1 KB	818.6 KB	-7.27%
👁	Memory	mem client unique-location-churn (vue)	1.3 MB	1.3 MB	-3.05%
👁	Memory	mem client navigation-churn (solid)	693.2 KB	716.8 KB	-3.29%

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 fix/viewport-preload-delay (dddc18d) with main (7e93431)}

[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 identified that this failure is unrelated to the PR's changes, which are scoped to viewport preload delay logic in the router adapters. The tanstack-solid-start-e2e-basic-cloudflare test fails because the Cloudflare Workers runtime is not active during vite preview, preventing the expected UI element from rendering — a pre-existing environment configuration issue. No changes to this PR are required to resolve it.

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