refactor: no additional package for isServer

[schiller-manuel]

closes #6483

Summary by CodeRabbit

Release Notes

• Refactor
  • Consolidated server detection utilities into router-core, streamlining package dependencies and organization.
  • Updated import paths: isServer is now available from @tanstack/router-core/isServer with environment-specific handling maintained.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR consolidates the standalone @tanstack/router-is-server package into @tanstack/router-core by migrating its source files, export configuration, and build setup. References across framework-specific packages are updated to reflect the new consolidated location.

Changes

Cohort / File(s)	Summary
Deleted: router-is-server package packages/router-is-server/package.json, packages/router-is-server/vite.config.ts, packages/router-is-server/eslint.config.js, packages/router-is-server/tsconfig.json, packages/router-is-server/src/client.ts, packages/router-is-server/src/server.ts	Entire standalone package removed as its functionality is consolidated into router-core.
router-core: isServer migration packages/router-core/src/isServer.ts	Updated to export isServer from new local development module instead of external @tanstack/router-is-server.
router-core: new isServer modules packages/router-core/src/isServer/client.ts, packages/router-core/src/isServer/server.ts	New files adding isServer exports with environment-specific implementations (client: false, server: true).
router-core: exports & build config packages/router-core/package.json, packages/router-core/vite.config.ts	Added comprehensive environment-specific export mappings (dev/workerd/worker/browser/deno/node/bun) for isServer. Added three new build entry points in vite config. Removed router-is-server dependency.
Reference updates labeler-config.yml, packages/react-router/vite.config.ts, packages/solid-router/vite.config.ts, packages/vue-router/vite.config.ts	Updated comments and references to point to @tanstack/router-core/isServer instead of @tanstack/router-is-server.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~40 minutes

Possibly related PRs

• feat: add isServer #4648: Introduced the initial isServer feature and created the @tanstack/router-is-server package that is now being consolidated into router-core in this PR.

Suggested reviewers

• birkskyum
• brenelz

Poem

🐰 A package stood alone, but now finds its way,
Hopping into router-core, where exports hold sway,
From the standalone warren to the central hall,
isServer blooms in every environment—serving all! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: consolidating the isServer export into router-core instead of maintaining it as a separate package.
Linked Issues check	✅ Passed	The PR successfully resolves issue #6483 by eliminating the dependency on the unpublished @tanstack/router-is-server package and moving isServer into router-core.
Out of Scope Changes check	✅ Passed	All changes are in-scope: removing router-is-server package, moving isServer functionality to router-core, and updating references in dependent packages (react-router, solid-router, vue-router).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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[nx-cloud]

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☁️ Nx Cloud last updated this comment at 2026-01-24 11:52:26 UTC

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commit: d5436ab