Variable defined on a component slot and used on the same element wrongly reported as not defined and not used

[divdavem]

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?

8.33.0

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

2.15.0

What did you do?

<script lang="ts">
  import MyComponent from "./MyComponent.svelte"
</script>

<MyComponent>
  <span
    slot="something"
    let:myVar
    class:myClass={myVar} />
</MyComponent>

What did you expect to happen?

I expected no eslint error because the myVar variable is actually defined and used.

What actually happened?

I get the following two wrong eslint errors:

8:9: 'myVar' is defined but never used. (no-unused-vars)
9:20: 'myVar' is not defined. (no-undef)

Link to GitHub Repo with Minimal Reproducible Example

https://ota-meshi.github.io/eslint-plugin-svelte/playground/#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

Additional comments

No response

[ota-meshi]

Thank you for posting issue.
But I think the rules are working correctly. I think you need to define let:myVar on the parent element (component).

https://svelte.dev/repl/07529de5b7c240e3a75fb51556ea5bce?version=3.55.1

[ota-meshi]

I misunderstood 😓 I just found out that it behaves differently if we give it a named slot.

https://svelte.dev/repl/3027bc1abe724a3cb474842f1880d6f3?version=3.55.1

[divdavem]

@ota-meshi Thank you for fixing this issue, and for doing it so quickly! 👍