fix(vue-router): avoid hash-dependent Link hydration mismatches by Sheraff · Pull Request #8440 · TanStack/router

Sheraff · 2026-09-15T19:22:46Z

🎯 Changes

Fix hash-dependent Link hydration in the Vue adapter. The server never receives the browser URL fragment, so the initial client render must agree with its empty hash.

Use the empty hash for isActive when activeOptions.includeHash is enabled, and for inherited/function-derived hash hrefs until hydration completes.
Use the live browser hash immediately on client-only and later mounts.
Avoid hydration-driven destination rebuilds for ordinary Links and literal hashes. Preserve shared route-match caching and explicit href/_fromLocation precedence.
Add SSR-to-DOM regression coverage for active attributes/content, DOM reuse, hash navigation, reactive options, first-render client values, and unnecessary rebuilding.
Include a Vue Router patch changeset.

The React and Solid fixes and their tests have moved to #8442, which is based directly on main and can merge independently. The hydration benchmarks are in #8439.

Vapor follow-up

The current hydration detector uses getCurrentInstance()?.vnode.el. Tests against Vue 3.6.0-rc.8 confirmed that the current VDOM Link works inside a Vapor parent through vaporInteropPlugin: the Link itself has a VNode and reuses the server anchor.

Calling the exported useLinkProps() directly from native Vapor setup is still unresolved. In that configuration getCurrentInstance() returns null, so the detector misses hydration and hash-sensitive active state or inherited hrefs can mismatch. This PR remains the place to address Vapor-aware detection and add corresponding regression coverage.

Vue unit, type, lint, and hydration checks were run during development. No checks were rerun for this split; CI will validate the updated PR.

✅ Checklist

I have followed the steps in the Contributing guide.
I have tested code changes locally with the relevant test commands, or tests do not apply to this pull request.
I fully understand the code in this pull request, including any code generated with AI assistance.

🚀 Release Impact

This change affects published code, and I have generated a changeset.
This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

Bug Fixes
- Improved Vue Router link hydration when URLs include hash fragments.
- Preserved correct active-link states during hydration, including hash values derived from functions or inherited from the current location.
- Ensured client-only links use the live hash immediately after mounting.
- Preserved explicit source-location and URL settings during hydration.
- Prevented unnecessary hydration updates for links that do not depend on hashes.

nx-cloud · 2026-09-15T19:23:17Z

View your CI Pipeline Execution ↗ for commit e50bc39

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☁️ Nx Cloud last updated this comment at 2026-09-15 22:18:10 UTC

coderabbitai · 2026-09-15T19:24:05Z

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📝 Walkthrough

Walkthrough

Vue Link hydration now uses the server-visible empty hash for hash-dependent destinations and active-state checks. After mounting, links use the live hash. New tests cover SSR, client-only rendering, reactive updates, and explicit URL precedence.

Changes

Vue Link hash hydration

Layer / File(s)	Summary
Vue Link hydration behavior `packages/vue-router/src/link.tsx`	Hydration state now controls hash resolution and active-state comparison. Hash-dependent destinations use an empty hash during hydration. Explicit `href` and source-location options retain precedence.
Hydration validation and release metadata `packages/vue-router/tests/link-hash-hydration.test.tsx`, `.changeset/sixty-rings-find.md`	Tests cover SSR hydration, client-only rendering, later-mounted links, reactive changes, destination rebuilding, and explicit precedence. The changeset declares a Vue router patch release.

Priority: ➖ Normal

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

Change: Bug fix

Merge Risk: ⚪ Minimal · up to e50bc

The hydration behavior preserves server-rendered link markup and updates to the browser hash after mounting without an identified current-head defect.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 6.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 10 files. (1 skipped: …	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.
Title check	✅ Passed	The title clearly and concisely identifies the Vue Router hash-dependent Link hydration fix, which matches the main change.
Description check	✅ Passed	The description follows the required template, explains the motivation and implementation, documents testing status, and includes the required checklist and changeset information.

Full details: Docstring Coverage

Explanation

Docstring coverage is 6.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 10 files. (1 skipped: 1 unsupported.)

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Commit unit tests in branch fix/vue-link-hash-hydration

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github-actions · 2026-09-15T19:24:25Z

🚀 Changeset Version Preview

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

🟩 Patch bumps

Package	Version	Reason
`@tanstack/react-router`	1.170.36 → 1.170.37	Changeset
`@tanstack/router-core`	1.171.30 → 1.171.31	Changeset
`@tanstack/solid-router`	1.170.34 → 1.170.35	Changeset
`@tanstack/vue-router`	1.170.33 → 1.170.34	Changeset
`@tanstack/react-start`	1.168.54 → 1.168.55	Dependent
`@tanstack/react-start-client`	1.168.34 → 1.168.35	Dependent
`@tanstack/react-start-rsc`	0.1.53 → 0.1.54	Dependent
`@tanstack/react-start-server`	1.167.41 → 1.167.42	Dependent
`@tanstack/router-cli`	1.167.36 → 1.167.37	Dependent
`@tanstack/router-generator`	1.167.36 → 1.167.37	Dependent
`@tanstack/router-plugin`	1.168.38 → 1.168.39	Dependent
`@tanstack/router-vite-plugin`	1.167.38 → 1.167.39	Dependent
`@tanstack/solid-start`	1.168.52 → 1.168.53	Dependent
`@tanstack/solid-start-client`	1.168.33 → 1.168.34	Dependent
`@tanstack/solid-start-server`	1.167.40 → 1.167.41	Dependent
`@tanstack/start-client-core`	1.170.30 → 1.170.31	Dependent
`@tanstack/start-plugin-core`	1.171.44 → 1.171.45	Dependent
`@tanstack/start-server-core`	1.169.35 → 1.169.36	Dependent
`@tanstack/start-static-server-functions`	1.167.35 → 1.167.36	Dependent
`@tanstack/start-storage-context`	1.167.32 → 1.167.33	Dependent
`@tanstack/vue-start`	1.168.51 → 1.168.52	Dependent
`@tanstack/vue-start-client`	1.167.36 → 1.167.37	Dependent
`@tanstack/vue-start-server`	1.167.40 → 1.167.41	Dependent

github-actions · 2026-09-15T19:26:38Z

Bundle Size Benchmarks

Commit: f3f6c22046d1
Measured at: 2026-09-15T22:09:06.872Z
Baseline source: history:8e164d28f9e9
Dashboard: bundle-size history

The following scenarios have bundle-size changes compared with the baseline:

Scenario	Current (gzip)	Initial (gzip)	Raw	Brotli	Trend
`react-router.minimal`	83.9 KiB -71 B	83.8 KiB -71 B	261.4 KiB -253 B	73.2 KiB -61 B	▆▆████▅▅▅▅▁
`react-router.full`	87.4 KiB -77 B	87.2 KiB -73 B	273.0 KiB -250 B	76.2 KiB -8 B	▆▆████▆▅▅▅▁
`solid-router.minimal`	33.4 KiB -62 B	33.2 KiB -63 B	95.6 KiB -250 B	30.2 KiB -56 B	██▆▆▆▆▆▆▆▆▁
`solid-router.full`	38.2 KiB -50 B	38.1 KiB -48 B	110.3 KiB -250 B	34.5 KiB +2 B	█▇▇▇▇▇▆▆▆▆▁
`vue-router.minimal`	49.5 KiB +19 B	49.4 KiB +17 B	137.0 KiB -38 B	44.8 KiB -52 B	██▅▅▅▅▄▄▄▄▁▄
`vue-router.full`	55.1 KiB +15 B	55.0 KiB +12 B	155.2 KiB -34 B	49.8 KiB +85 B	██▅▅▅▅▄▄▄▄▁▅
`react-start.minimal`	96.8 KiB -73 B	96.7 KiB -77 B	303.6 KiB -240 B	84.0 KiB -53 B	▄▄████▅▅▅▅▁
`react-start.query-integration`	104.2 KiB -103 B	104.0 KiB -101 B	330.1 KiB -239 B	90.3 KiB -98 B	▅▅████▆▆▆▆▁
`react-start.deferred-hydration`	97.6 KiB -69 B	96.7 KiB -76 B	305.0 KiB -240 B	84.6 KiB +3 B	▄▄████▅▅▅▅▁
`react-start.full`	100.0 KiB -74 B	99.8 KiB -77 B	313.3 KiB -258 B	86.7 KiB -38 B	▅▄████▆▅▅▅▁
`react-start.rsbuild.minimal`	100.2 KiB -45 B	100.0 KiB -45 B	314.1 KiB -176 B	86.5 KiB +42 B	▁▁████▆▆▆▆▃
`react-start.rsbuild.minimal-iife`	100.6 KiB -45 B	100.4 KiB -45 B	315.1 KiB -176 B	86.8 KiB -45 B	▁▁████▇▇▇▇▄
`react-start.rsbuild.full`	103.4 KiB -59 B	103.2 KiB -59 B	324.2 KiB -176 B	89.2 KiB +47 B	▂▂████▆▅▅▅▁
`solid-start.minimal`	46.3 KiB -73 B	46.2 KiB -73 B	136.8 KiB -250 B	41.2 KiB -42 B	▅▅████▆▆▆▆▁
`solid-start.deferred-hydration`	49.3 KiB -71 B	46.2 KiB -73 B	144.1 KiB -250 B	43.9 KiB -68 B	▆▆████▆▆▆▆▁
`solid-start.full`	51.3 KiB -70 B	51.2 KiB -70 B	152.1 KiB -250 B	45.6 KiB -72 B	▅▄████▆▆▆▆▁
`vue-start.minimal`	65.6 KiB +9 B	65.5 KiB +10 B	187.9 KiB -38 B	58.5 KiB -42 B	██▅▅▅▅▄▄▄▄▁▄
`vue-start.full`	69.5 KiB +14 B	69.4 KiB +15 B	200.2 KiB -39 B	61.8 KiB +42 B	██▆▆▆▆▄▄▄▄▁▅

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 · 2026-09-15T19:27:00Z

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commit: e50bc39

codspeed · 2026-09-15T19:41:21Z

Merging this PR will not alter performance

✅ 180 untouched benchmarks

_{Comparing fix/vue-link-hash-hydration (e50bc39) with main (a0b2ad9)}

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Inline comments:
In `@packages/solid-router/src/link.tsx`:
- Around line 126-132: Update the hydrating conditional around Solid.onMount to
use curly braces, preserving its existing behavior and placement.

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📒 Files selected for processing (11)

.changeset/sixty-rings-find.md
e2e/solid-start/basic/src/routeTree.gen.ts
e2e/solid-start/basic/src/routes/link-hash-hydration.tsx
e2e/solid-start/basic/tests/link-hash-hydration.spec.ts
packages/react-router/src/ClientOnly.tsx
packages/react-router/src/link.tsx
packages/react-router/tests/link-hash-hydration.test.tsx
packages/solid-router/src/link.tsx
packages/solid-router/tests/link-hash.test.tsx
packages/vue-router/src/link.tsx
packages/vue-router/tests/link-hash-hydration.test.tsx

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We classified these failures as environment_state because the failing project (tanstack-solid-start-e2e-deferred-hydration) was not touched by this PR, which is scoped solely to Vue Router and React Router hash-dependent Link hydration. The Solid Start deferred hydration chunk-loading test has a 0% flakiness rate and its failure is unrelated to the changes introduced here, indicating a pre-existing environment issue in CI.

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fix(vue-router): avoid hash-dependent Link hydration mismatches

2150ba4

github-actions Bot added the package: vue-router label Sep 15, 2026

birkskyum previously approved these changes Sep 15, 2026

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birkskyum self-requested a review September 15, 2026 20:40

fix(router): align hash-dependent Link hydration across adapters

9c89651

github-actions Bot added package: react-router package: solid-router labels Sep 15, 2026

Sheraff changed the title ~~fix(vue-router): avoid hash-dependent Link hydration mismatches~~ fix(router): avoid hash-dependent Link hydration mismatches across adapters Sep 15, 2026

Sheraff mentioned this pull request Sep 15, 2026

bench(client-nav): add React, Solid, and Vue hydration scenarios #8439

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fix(router): avoid hash-dependent Link hydration mismatches in React and Solid #8442

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chore: split React and Solid hydration fixes into #8442

e50bc39

Sheraff changed the title ~~fix(router): avoid hash-dependent Link hydration mismatches across adapters~~ fix(vue-router): avoid hash-dependent Link hydration mismatches Sep 15, 2026

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fix(vue-router): avoid hash-dependent Link hydration mismatches#8440
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