fix(module): keep app config ui optional when augmenting nuxt/schema

[lazerg]

🔗 Linked issue

Resolves #6791

❓ Type of change

• 🐞 Bug fix (a non-breaking change that fixes an issue)

📚 Description

Adding a .d.ts that augments nuxt/schema with an AppConfigInput interface makes the ui key in app.config.ts required instead of optional.

nuxt/schema re-exports @nuxt/schema and bridges CustomAppConfig back into its own module identity, but not AppConfigInput. Once a user declares AppConfigInput on nuxt/schema, our optional ui? override (declared on @nuxt/schema) no longer reaches that surface, and the required ui inherited from CustomAppConfig shows through instead. Augmenting nuxt/schema too keeps ui optional on the surface defineAppConfig reads.

📝 Checklist

• I have linked an issue or discussion.

[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 Plus

Run ID: 762fc986-e2de-4589-b981-4452fc8c0ba3

📥 Commits

Reviewing files that changed from the base of the PR and between a592f8e and 6b19ade.

📒 Files selected for processing (1)

• src/templates.ts

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📝 Walkthrough

Walkthrough

The generated types/ui.d.ts template now augments nuxt/schema. The augmentation declares an optional AppConfigInput.ui property typed as AppConfigUI.

Estimated code review effort: 2 (Simple) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the fix that keeps the app config ui property optional during nuxt/schema augmentation.
Description check	✅ Passed	The description explains the type regression, the cause, and the augmentation-based fix.
Linked Issues check	✅ Passed	The change directly addresses issue #6791 by preserving an optional ui property on the nuxt/schema surface.
Out of Scope Changes check	✅ Passed	The change is limited to the declaration template required to fix the linked issue.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codspeed-hq]

Merging this PR will not alter performance

✅ 31 untouched benchmarks

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_{Comparing lazerg:fix/6791-app-config-input-optional (6b19ade) with v4 (a592f8e)}

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@6793

commit: 6b19ade