False positive svelte/no-unused-props when spreading props since 3.12.4

[machadinhos]

Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.

What version of ESLint are you using?

9.36.0

What version of eslint-plugin-svelte are you using?

3.12.4

What did you do?

Configuration

The default configuration after creating a svelte app with npx sv create project_name and choosing typescript and eslint.

<!--Test.svelte-->
<script lang="ts">
	interface Props {a: string;}

	let { a, b }: Props = $props();
</script>

{a}
{b}

<!--Test1.svelte-->
<script lang="ts">
	import Test from '$lib/Test.svelte';

	interface Props {a: string;}

	let props: Props = $props();
</script>

<Test {...props} />

On the Test1.svelte component props will have the following error:

'a' is an unused Props property  svelte/no-unused-props

Changing to eslint-plugin-svelte@3.12.3 makes the error go away.

Thank you!

What did you expect to happen?

It shouldn't give an error because "a" is in props and props is being spread to <Test1>.

What actually happened?

'a' is an unused Props property  svelte/no-unused-props

Link to GitHub Repo with Minimal Reproducible Example

https://github.com/machadinhos/no-unused-props-bug-demo

Additional comments

No response

[baseballyama]

@machadinhos Are you using Windows?

[machadinhos]

@baseballyama yes I am, does that make a difference?
I know windows is horrible, but don't tell me it's that bad hahaha

[baseballyama]

After reviewing the code, I found it’s a bug that also occurs on macOS. It looks like no one had hit this case before.
I’m working on it now👍

Since the GitHub belongs to Microsoft, I can’t really badmouth Windows here😆