fix(deps): move fetchdts from devDependencies to dependencies

[tsmithhisler]

should resolve #7316

Summary by CodeRabbit

• Chores
  • Adjusted dependency placement so a previously development-only package is now a runtime dependency, ensuring it is available when the package is executed and aligning dependency management with runtime needs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e6c8e56e-f7ef-42cb-b1e1-5b295607bd99

📥 Commits

Reviewing files that changed from the base of the PR and between a311a2c and ed700ae.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (1)

• packages/start-server-core/package.json

🚧 Files skipped from review as they are similar to previous changes (1)

• packages/start-server-core/package.json

---

📝 Walkthrough

Walkthrough

fetchdts was moved from devDependencies to dependencies in packages/start-server-core/package.json.

Changes

Dependency Promotion

Layer / File(s)	Summary
Manifest change packages/start-server-core/package.json	fetchdts removed from devDependencies and added to dependencies (relocated to runtime dependencies).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A tiny hop across the line,
fetchdts now walks where runtimes dine,
No more dev-only moonlight dance,
Types step out into the prance,
A carrot cheer for steady chance.

🚥 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 clearly and accurately summarizes the main change: moving fetchdts from devDependencies to dependencies in the package manifest.
Linked Issues check	✅ Passed	The code change directly addresses issue #7316 by moving fetchdts to dependencies, enabling consumers to resolve the exported TypedHeaders type without lint errors.
Out of Scope Changes check	✅ Passed	Only the fetchdts dependency placement was modified; no other unrelated changes are present in the pull request.
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 unit tests (beta)

• Create PR with unit tests

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[github-actions]

Bundle Size Benchmarks

• Commit: d2e8c2aba2d1
• Measured at: 2026-05-02T02:52:53.163Z
• Baseline source: history:96818b8ba5ea
• Dashboard: bundle-size history

Scenario	Current (gzip)	Delta vs baseline	Raw	Brotli	Trend
react-router.minimal	87.15 KiB	0 B (0.00%)	273.94 KiB	75.70 KiB	████▁▁▁▁▁▁▁
react-router.full	90.68 KiB	0 B (0.00%)	285.45 KiB	78.71 KiB	████▁▁▁▁▁▁▁
solid-router.minimal	35.38 KiB	0 B (0.00%)	106.25 KiB	31.81 KiB	████▁▁▁▁▁▁▁
solid-router.full	40.10 KiB	0 B (0.00%)	120.46 KiB	36.04 KiB	████▁▁▁▁▁▁▁
vue-router.minimal	53.15 KiB	0 B (0.00%)	151.39 KiB	47.73 KiB	████▁▁▁▁▁▁▁
vue-router.full	58.28 KiB	0 B (0.00%)	167.56 KiB	52.18 KiB	████▁▁▁▁▁▁▁
react-start.minimal	101.76 KiB	0 B (0.00%)	322.10 KiB	87.97 KiB	████▁▁▁▁▁▁▁
react-start.full	105.19 KiB	0 B (0.00%)	332.43 KiB	90.96 KiB	████▁▁▁▁▁▁▁
react-start.rsbuild.minimal	99.33 KiB	0 B (0.00%)	316.47 KiB	85.46 KiB	██▂▂▁▁▁▁▁▁▁
react-start.rsbuild.full	102.63 KiB	0 B (0.00%)	326.90 KiB	88.28 KiB	██▂▂▁▁▁▁▁▁▁
solid-start.minimal	49.40 KiB	0 B (0.00%)	152.08 KiB	43.60 KiB	████▁▁▁▁▁▁▁
solid-start.full	55.20 KiB	0 B (0.00%)	168.98 KiB	48.51 KiB	████▁▁▁▁▁▁▁

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