fix(router-core): dedupe canonical head links so child routes override parents - #8289
fix(router-core): dedupe canonical head links so child routes override parents#8289ousamabenyounes wants to merge 2 commits into
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…e parents `head.links` from all matched routes were concatenated with only exact JSON-equality deduping, so a `<link rel="canonical">` defined on a child route could not override the parent's — both were rendered, producing invalid HTML and conflicting canonical URLs that hurt SEO. Dedupe unique-by-nature link rels (currently `canonical`) in the shared `appendUniqueUserTags`, keeping the last (deepest/child) occurrence, mirroring how `meta` tags dedupe by `name`/`property`. Repeatable rels such as `stylesheet`, `preload` and `icon` are left untouched. Closes TanStack#6719 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughThe router core now deduplicates canonical links across nested routes. The deepest route replaces the parent canonical link. Other link relations remain repeatable. Tests, documentation, and a patch changeset describe the behavior. ChangesCanonical link deduplication
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This change makes nested-route canonical links retain the deepest route’s value while preserving repeatable and manifest-managed links. No concrete current-head merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant RouteMatches
participant appendUniqueUserTags
participant RenderedHead
RouteMatches->>appendUniqueUserTags: Provide nested route link tags
appendUniqueUserTags->>appendUniqueUserTags: Keep the last canonical link
appendUniqueUserTags-->>RenderedHead: Return the child canonical and repeatable links
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✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files. (1 skipped: 1 unsupported.)
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Inline comments:
In `@docs/router/guide/document-head-management.md`:
- Line 64: Update the router head-management documentation to clarify that
stylesheet, preload, and icon links are not deduped by their rel value, while
identical tags are still removed and distinct links remain repeatable; keep the
canonical-link override description unchanged.
In `@packages/router-core/src/manifest.ts`:
- Around line 158-160: Update uniqueLinkRelKey to normalize rel as
case-insensitive, space-separated tokens before checking UNIQUE_LINK_RELS, so
values such as uppercase or multiple-token rel attributes identify canonical
links consistently. Add regression coverage for normalized canonical rel values
while preserving existing behavior for non-unique relations.
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.changeset/dedupe-canonical-head-links.mddocs/router/guide/document-head-management.mdpackages/router-core/src/manifest.tspackages/router-core/tests/manifest.test.ts
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Addressed both review findings in 5a4edb9.
Verified with focused RED/GREEN tests and the full four-package local CI replay (build, eslint, types, unit). |
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🎯 Changes
Fixes #6719.
head.linksfrom every matched route were concatenated and deduped only by exactJSON.stringifyequality, so a<link rel="canonical">defined on a child route could not override a parent's — both ended up in the rendered<head>. Two different canonical URLs is invalid HTML and actively harmful for SEO. This is inconsistent withmetatags, which already dedupe byname/propertywith the child winning.The dedup happens in one shared place,
appendUniqueUserTags(packages/router-core/src/manifest.ts), so all three framework adapters (react/solid/vue) inherit the fix:UNIQUE_LINK_RELSset marks rels that are unique by nature (currently justcanonical).metasemantics.stylesheet,preload,icon,alternate, …) are left exactly as before.Manifest-managed stylesheet/preload links are pushed directly and never routed through
appendUniqueUserTags, so asset emission is unaffected.Docs (
docs/router/guide/document-head-management.md) and a changeset are included.Test verification (RED → GREEN)
New unit tests in
packages/router-core/tests/manifest.test.ts. Run against the unmodified base (fix reverted, tests kept) — RED:With the fix — GREEN:
Full local suite for the affected packages (
@tanstack/router-core,@tanstack/react-router,@tanstack/solid-router,@tanstack/vue-router) — build, eslint, types and unit — is green on both the base branch and this branch (1123 unit tests passing, no new failures):✅ Checklist
🚀 Release Impact
Summary by CodeRabbit
New Features
Documentation
Review follow-up
Canonical
relmatching is case-insensitive and uses HTML ASCII-whitespace tokenization. Regression tests cover token lists plus Unicode-whitespace boundaries. Repeatable rels are not deduped by rel; distinct links repeat while identical tags retain existing exact-tag deduplication.Focused result after review fixes: 20 tests passed.