fix: attach fn, arrayFn, extend to defu function to match its type

[Mohammad-Faiz-Cloud-Engineer]

DefuInstance interface declares these properties but defu = createDefu() just returns a bare function, the as DefuInstance cast was lying to TypeScript. Anyone calling defu.fn(), defu.arrayFn(), or defu.extend() would get a runtime crash despite passing typecheck.

Reordered defuFn/defuArrayFn before defu so they can be referenced, then used Object.assign to attach them to the function object. CJS bridge (lib/defu.cjs) auto-picks these up via module.exports = defu.

Summary by CodeRabbit

• New Features
  • Extended the main export with additional utility functions and helper properties for enhanced flexibility and functionality.

[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: 617d3213-911d-4977-bceb-84c8581dff34

📥 Commits

Reviewing files that changed from the base of the PR and between 82632b6 and 17bc4e9.

📒 Files selected for processing (1)

• src/defu.ts

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📝 Walkthrough

Walkthrough

The PR updates the main defu export to include convenience properties—fn, arrayFn, and extend—by wrapping createDefu() with Object.assign. The default export is updated accordingly, maintaining backward compatibility while exposing internal merger functions and the extend capability directly on the instance.

Changes

Defu Instance Export Enrichment

Layer / File(s)	Summary
Enrich defu export with convenience properties src/defu.ts	The standard defu export is replaced with Object.assign(createDefu(), { fn: defuFn, arrayFn: defuArrayFn, extend: createDefu }), attaching convenience properties to the main instance; the default export now references this enriched shape.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• unjs/defu#157: Both PRs adjust the public defu export shape—this PR changes the runtime defu instance to include fn/arrayFn/extend, while the related PR updates the corresponding .d.cts typing to match that enriched structure.

Suggested reviewers

• pi0

Poem

🐰 A rabbit's refrain on enrichment so true:
The defu default grew properties new,
With fn, arrayFn, and extend in sight,
The shape is more full, yet backward stays tight! ✨

🚥 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 'fix: attach fn, arrayFn, extend to defu function to match its type' clearly and specifically describes the main change: attaching missing properties to the defu function to align runtime behavior with its TypeScript type definition.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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