fix(runtime-core): add undefined to NativeType type (fix #13593)

[Dylancyclone]

Fixes: #13593

See that issue for more information

The InferDefault type filters out any type that isn't listed in NativeType, and instead requests a function that returns the type intersected with an empty object ({}). However, the intersection with an empty object discards null and undefined (According to the docs). This isn't an issue for null, because it is explicitly listed as a NativeType, however this causes an issue for undefined.

Currently, when exactOptionalPropertyTypes and strictNullChecks are true, you cannot set a prop's default value to undefined even if it's listed as a possible type. This fixes the issue by explicitly letting it be a default value

Summary by CodeRabbit

• Refactor
  • Improved type handling to better support cases where values may be undefined.

[coderabbitai]

Walkthrough

The type alias NativeType in apiSetupHelpers.ts was updated to include undefined as a possible value. This change ensures that type inference logic using NativeType—notably in InferDefault—now correctly recognizes undefined as a valid default value. No other logic or functionality was modified.

Changes

File(s)	Change Summary
packages/runtime-core/src/apiSetupHelpers.ts	Added undefined to NativeType type alias definition

Assessment against linked issues

Objective	Addressed	Explanation
Allow props of type possibly undefined to have a default value of undefined with exactOptionalPropertyTypes and strictNullChecks enabled (#13593)	✅

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes found.

Possibly related PRs

• fix(types): exclude undefined from inferred prop types with default values #13007: Addresses handling of undefined in prop type inference, similarly focused on undefined treatment in type definitions.

Suggested labels

scope: types

Suggested reviewers

• johnsoncodehk
• edison1105

Poem

A rabbit hopped through types so neat,
And found undefined had no seat.
With a flick of its paw,
It fixed the type law—
Now props and their defaults can meet!
🐇✨

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Reviewing files that changed from the base of the PR and between 02984a4 and 1b1e93f.

📒 Files selected for processing (1)

• packages/runtime-core/src/apiSetupHelpers.ts (1 hunks)

🧰 Additional context used

🪛 Biome (1.9.4)

packages/runtime-core/src/apiSetupHelpers.ts

[error] 329-329: Don't use 'Function' as a type.

Prefer explicitly define the function shape. This type accepts any function-like value, which can be a common source of bugs.

(lint/complexity/noBannedTypes)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (3)

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🔇 Additional comments (1)

packages/runtime-core/src/apiSetupHelpers.ts (1)

322-329: LGTM! The addition of undefined to NativeType correctly addresses the TypeScript strict mode issue.

This change allows undefined to be used as a direct default value for props when exactOptionalPropertyTypes and strictNullChecks are enabled, which is consistent with how null is already handled in the type system.

✨ Finishing Touches

• 📝 Generate Docstrings

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB	38.4 kB	34.5 kB
vue.global.prod.js	159 kB	58.5 kB	52.1 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.5 kB	18.2 kB	16.7 kB
createApp	54.5 kB	21.2 kB	19.4 kB
createSSRApp	58.7 kB	22.9 kB	20.9 kB
defineCustomElement	59.5 kB	22.8 kB	20.8 kB
overall	68.5 kB	26.4 kB	24 kB

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commit: 1b1e93f