fix: repro 1293 & 1156 in TSR

[franky47]

After the React Router fix in #1316 (and the added test for Next.js in #1317), it's TanStack Router's turn at #1293.

It did have an issue where the source page would re-render with destination URL state when navigating via a Link or the Back button.

Opus didn't manage to get to the end of its thoughts, but GPT-5.2-codex high found a way to switch between optimistic & resolved search based on whether or not we're in a navigation to another path (to avoid breaking the #1099 repro).

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Project	Deployment	Actions	Updated (UTC)
nuqs	Ready	Preview, Comment	Feb 2, 2026 1:00pm

[pkg-pr-new]

pnpm add https://pkg.pr.new/nuqs@1318

commit: cfe7924

[Copilot]

Pull request overview

This PR updates the TanStack Router adapter to avoid leaking destination search params into still-mounted source pages (repro #1293) and adds E2E coverage for TanStack Router, including a delayed-loader variant to ensure behavior is robust under slower navigations.

Changes:

• Update useNuqsTanstackRouterAdapter to distinguish between stable and in-flight navigations using useRouterState, caching the last stable search per adapter instance and using it during cross-page transitions.
• Add TanStack Router E2E routes for the 1293 repro (/repro-1293/a|b and delayed /repro-1293-late/a|b) using the shared Repro1293 pages.
• Add Playwright specs wiring TanStack Router into the shared repro-1293 test harness, including a delayed-loader variant with router tagging and description.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/nuqs/src/adapters/tanstack-router.ts	Extends the adapter to read resolvedLocation via useRouterState, cache the last stable search per adapter instance, and derive URLSearchParams from a new activeSearch that switches between live and cached search depending on whether the current path is in a stable (resolved) state.
packages/e2e/tanstack-router/src/routes/repro-1293.a.tsx	Declares TanStack Router route /repro-1293/a rendering Repro1293PageA with a link to /repro-1293/b, matching the shared repro-1293 behavior.
packages/e2e/tanstack-router/src/routes/repro-1293.b.tsx	Declares TanStack Router route /repro-1293/b rendering Repro1293PageB, which handles the back navigation portion of the repro.
packages/e2e/tanstack-router/src/routes/repro-1293-late.a.tsx	Adds a second route /repro-1293-late/a that reuses Repro1293PageA but targets the delayed-loader variant at /repro-1293-late/b.
packages/e2e/tanstack-router/src/routes/repro-1293-late.b.tsx	Adds /repro-1293-late/b with a simple async loader that waits before rendering Repro1293PageB, exercising the adapter under delayed navigation.
packages/e2e/tanstack-router/specs/shared/repro-1293.spec.ts	Wires TanStack Router into the shared testRepro1293 harness with path: '/repro-1293', mirroring the RR and Remix shared specs.
packages/e2e/tanstack-router/specs/repro-1293-late.spec.ts	Adds a dedicated Playwright spec for the delayed-loader variant, invoking testRepro1293 with path: '/repro-1293-late' plus router: 'tanstack-router' and a descriptive label.

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