TypeScript enables strict mode, and the interface includes an optional `never` type; `defineProps` returns the `never` type.

[jevin98]

Vue version

3.5.22

Link to minimal reproduction

https://play.vuejs.org/#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

Steps to reproduce

What is expected?

What is actually happening?

System Info

System:
 OS: Windows 10 10.0.19044
 CPU: (20) x64 Intel(R) Xeon(R) CPU E5-2666 v3 @ 2.90GHz
 Memory: 9.39 GB / 31.84 GB
 Binaries:
 Node: 23.11.1 - C:\nvm4w\nodejs\node.EXE
 npm: 10.9.2 - C:\nvm4w\nodejs\npm.CMD
 pnpm: 10.19.0 - C:\nvm4w\nodejs\pnpm.CMD
 Browsers:
 Chrome: 141.0.7390.108
 Edge: Chromium (141.0.3537.92)
 Internet Explorer: 11.0.19041.5794

Any additional comments?

No response

[coderabbitai]

A summary of the changes CodeRabbit can apply:

• Update packages/shared/src/typeUtils.ts to change LooseRequired to split out never-typed keys and keep them optional (preventing defineProps from resolving to never), and add corresponding tests in packages-private/dts-test/setupHelpers.test-d.ts for defineProps with optional never and withDefaults.

• Add new TypeScript tests in packages-private/dts-test/setupHelpers.test-d.ts covering optional never props and withDefaults, and modify packages/shared/src/typeUtils.ts to change LooseRequired<T> so properties typed never are excluded from required keys and instead treated as optional to prevent optional-never becoming required.

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