feat: re-export header types from fetchdts

[LikiosSedo]

Summary

Re-export TypedHeaders, RequestHeaders, ResponseHeaders, RequestHeaderMap, and ResponseHeaderMap from fetchdts so consumers can type functions that accept h3 headers without importing fetchdts directly.

Currently TypedServerRequest is exported but the TypedHeaders type used by its headers property is not, making it awkward to write typed helper functions.

Also adds the RequestHeaders and ResponseHeaders exports mentioned in the migration guide ("TypedHeaders: Migrate to RequestHeaders and ResponseHeaders").

Closes #1308

Summary by CodeRabbit

• New Features
  • Improved TypeScript support for HTTP headers by adding/exporting refined header-related types (TypedHeaders, RequestHeaders, ResponseHeaders, RequestHeaderMap, ResponseHeaderMap), enabling stronger typing and better developer experience when working with request/response headers.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b63a0da7-0caf-4f9b-9162-5e7daceaf336

📥 Commits

Reviewing files that changed from the base of the PR and between d3979d3 and 6b57430.

📒 Files selected for processing (2)

• src/index.ts
• src/types/handler.ts

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

• src/index.ts

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📝 Walkthrough

Walkthrough

Updated TypeScript exports to expose five header-related types (TypedHeaders, RequestHeaders, ResponseHeaders, RequestHeaderMap, ResponseHeaderMap) by adding imports/re-exports in src/types/handler.ts and re-exporting them from src/index.ts. No runtime logic changed.

Changes

Cohort / File(s)	Summary
Type re-exports — public entry src/index.ts	Added type re-exports: TypedHeaders, RequestHeaders, ResponseHeaders, RequestHeaderMap, ResponseHeaderMap.
Type imports & re-exports — internal types src/types/handler.ts	Imported and re-exported the five header-related types from upstream (fetchdts): TypedHeaders, RequestHeaders, ResponseHeaders, RequestHeaderMap, ResponseHeaderMap.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hopped through types to spread the cheer,
Five header friends now living here,
Quietly added, no code to spar—
A little export, a tiny star ✨

🚥 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 'feat: re-export header types from fetchdts' clearly and accurately summarizes the main change of re-exporting five header-related types to improve API usability.
Linked Issues check	✅ Passed	The PR successfully addresses issue #1308 by re-exporting TypedHeaders, RequestHeaders, ResponseHeaders, RequestHeaderMap, and ResponseHeaderMap, enabling consumers to type functions handling h3 headers without direct fetchdts dependency.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to the stated objective of re-exporting header types; no unrelated modifications or out-of-scope changes are present.
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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