fix(router-core): fix dangling reference to stripped field

[oddsund]

🎯 Changes

DehydratedMatch['b'] is typed by RouteMatch['__beforeLoadContext'], and RouteMatch['__beforeLoadContext'] is tagged @internal. This worked fine until stripInternal was enabled in fd341ad(PR #4907), which strips @internal members from the published .d.ts. This has made this reference dangling since router-core@1.171.16. f330532 (PR #6118) later moved the interface to its current file unchanged. When 45c4ad8 (PR #7805) rewrote to load-client.ts and started importing from ./ssr/types, the dangling reference was surfaced for consumers with skipLibCheck: false in this error:

error TS2339: Property '__beforeLoadContext' does not exist on type 'MakeRouteMatch'.

We solve this by giving b the declared type of __beforeLoadContext, instead of indexing into the stripped member.

Verified against a built package: the emitted dist/esm/ssr/types.d.ts no longer references the internal member, and a minimal consumer repro type-checks cleanly with this dist swapped in.

Fixes #8203

✅ 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
  • Fixed a published TypeScript declaration issue affecting dehydrated route data.
  • Resolved compilation errors for consumers using stricter type-checking settings.
  • Improved compatibility by using a stable, publicly available context type.

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ℹ️ Recent review info

⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between 37877da and aa6c29e.

📒 Files selected for processing (2)

• .changeset/dehydrated-match-before-load-context-type.md
• packages/router-core/src/ssr/types.ts

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

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📝 Walkthrough

Walkthrough

The PR changes DehydratedMatch.b to Record<string, unknown> and adds a patch changeset for @tanstack/router-core. This removes its reference to the internal route match context member.

Changes

Dehydrated match context typing

Layer / File(s)	Summary
Update dehydrated match context type packages/router-core/src/ssr/types.ts, .changeset/dehydrated-match-before-load-context-type.md	DehydratedMatch.b now uses Record<string, unknown> instead of indexing into MakeRouteMatch['__beforeLoadContext']. The changeset declares a patch release for @tanstack/router-core.

Estimated code review effort: 2 (Simple) | ~5 minutes

Merge Risk: ⚪ Minimal · up to aa6c2

This patch fixes the published SSR type declaration without changing runtime behavior or serialized data. No actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
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 identifies the router-core fix and the dangling reference caused by a stripped field. It is concise and related to the primary change.
Description check	✅ Passed	The description is complete and follows the repository template. It explains the cause, the fix, the reported error, verification results, issue reference, checklist status, and changeset impact.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

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