fix(router-core): tanstack/store v0.9 requires createStore instead of new Store

[Sheraff]

Fix a minor migration issue where new Store() should now be createStore(). In practice this does not change anything (same code being called under the hood). It's only to better align Router with the new public API of Store.

Summary by CodeRabbit

• Refactor
  • Updated internal store initialization pattern to use a factory function approach, improving code maintainability while preserving existing server and non-server initialization paths.

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request replaces the Store constructor with a createStore factory function for initializing the internal router store. Import statements and initialization logic in both server and non-server code paths are updated accordingly, with Store added as a type-only import.

Changes

Cohort / File(s)	Summary
Store initialization refactoring packages/router-core/src/router.ts	Replaced direct Store constructor calls with createStore factory function; updated imports to use createStore and added Store as type-only import; both server and non-server initialization paths updated.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• performance: no reactivity on the server #6497 — Directly modifies store initialization in the same file, adding createServerStore and switching server-side initialization to that factory.
• refactor(router-core): improve server store performance by removing getter/setter #6502 — Refactors the server store implementation used by createStore/createServerStore.
• fix(router): bump tanstack store to ^0.8 #5680 — Bumps @tanstack/store dependency to ^0.8 which includes the createStore API being adopted in this PR.

Suggested labels

package: router-core

Suggested reviewers

• brenelz
• birkskyum

Poem

🐰 A factory springs forth, oh what delight!
No more constructors cluttering the night,
createStore hops in, so clean and so bright,
The router's store initialization feels right!
✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and accurately describes the main change: migrating from using 'new Store' to 'createStore' due to tanstack/store v0.9 requirements.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-router-core-store-migration-factory

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[nx-cloud]

View your CI Pipeline Execution ↗ for commit 04cf5d1

Command	Status	Duration	Result
nx run tanstack-router-e2e-bundle-size:build --...	✅ Succeeded	1m 29s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-02-25 07:37:32 UTC

[github-actions]

Bundle Size Benchmarks

• Commit: e374f6ef066a
• Measured at: 2026-02-25T07:27:43.698Z
• Baseline source: history:c099ebf204bb
• Dashboard: bundle-size history

Scenario	Current (gzip)	Delta vs baseline	Raw	Brotli	Trend
react-router.minimal	86.57 KiB	+37 B (+0.04%)	272.38 KiB	75.30 KiB	██▁▁▁▁▁▁▁▁▁▃
react-router.full	89.60 KiB	+47 B (+0.05%)	282.71 KiB	77.92 KiB	██▁▁▁▁▁▁▁▁▁▃
solid-router.minimal	35.87 KiB	+24 B (+0.07%)	107.49 KiB	32.26 KiB	██▁▁▁▁▁▃▃▃▃▄
solid-router.full	40.20 KiB	+24 B (+0.06%)	120.54 KiB	36.11 KiB	██▁▁▂▂▂▃▃▃▃▄
vue-router.minimal	51.74 KiB	+31 B (+0.06%)	147.46 KiB	46.49 KiB	██▁▁▂▂▂▄▄▄▄▅
vue-router.full	56.53 KiB	+20 B (+0.03%)	163.05 KiB	50.80 KiB	██▁▁▁▁▁▂▂▂▂▃
react-start.minimal	99.10 KiB	+21 B (+0.02%)	311.51 KiB	85.70 KiB	▆█▁▁▁▁▁▁▁▁▁▂
react-start.full	102.47 KiB	+53 B (+0.05%)	321.29 KiB	88.61 KiB	▆█▁▁▁▁▁▁▁▁▁▃
solid-start.minimal	48.18 KiB	+25 B (+0.05%)	145.06 KiB	42.59 KiB	▅█▁▁▂▂▂▃▃▃▃▄
solid-start.full	53.66 KiB	+41 B (+0.07%)	160.97 KiB	47.34 KiB	▆█▁▁▁▁▁▃▃▃▃▄

Trend sparkline is historical gzip bytes ending with this PR measurement; lower is better.

[pkg-pr-new]

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commit: 04cf5d1