Type error when `#snippet` imported from other component's `<script module>`

[janosh]

Describe the bug

docs advise:

Snippets declared at the top level of a .svelte file can be exported from a <script module> for use in other components, provided they don’t reference any declarations in a non-module <script> (whether directly or indirectly, via other snippets) (demo):

<script module>
	export { add };
</script>

{#snippet add(a, b)}
	{a} + {b} = {a + b}
{/snippet}

This requires Svelte 5.5.0 or newer

Reproduction

when i try that, i get a type error

Type '(props: ScatterHandlerProps) => ReturnType<import("svelte").Snippet>' is not assignable to type 'Snippet<[ScatterHandlerProps<Record<string, unknown>>]>'.
Type '{ '{@render ...} must be called with a Snippet': "import type { Snippet } from 'svelte'"; } & typeof SnippetReturn' is not assignable to type '{ '{@render ...} must be called with a Snippet': "import type { Snippet } from 'svelte'"; } & typeof SnippetReturn'. Two different types with this name exist, but they are unrelated.

Expected behaviour

same type should be inferred for snippet in external importing Svelte components as in the original component that defines the snippet where no type error is raised when using the snippet in the same way

System Info

• OS: macOS
• IDE: Cursor

Which package is the issue about?

svelte-check

Additional Information, eg. Screenshots

No response

[jasonlyu123]

The error is not that the generic can't be inferred, or that it is being inferred incorrectly. Rather, the error message means you have 2 Snippet types that are incompatible with each other. This is typically because you have multiple copies of Svelte installed. Can you check if that is the case? You can see if sveltejs/svelte#15182 has anything similar to your project setup.