Svelte 5: `{#snippet}` TypeScript support

[hanneswidrig]

Describe the problem

I assume there are plans for TypeScript typing support but I didn't see any public issues created yet. When using lang="ts", #snippet displays ESLint errors and every parameter is typed as any, it would be wonderful if we could get support for typed parameters within the {#snippet ...} definition.

Describe the proposed solution

Ability to type snippet parameters to ensure type safety.

Alternatives considered

N/A

Importance

would make my life easier

[dummdidumm]

You can now use typescript types inside the template.