Svelte 5: Implicit children not detected correctly

[eddiemcconkie]

Describe the bug

If I have a Parent.svelte component that has a children prop, passing children to the component implicitly (without the {#snippet children()} block) I get the error Property 'children' is missing in type '{}' but required in type '{ children: () => void; }'.
If I put the children inside a {#snippet children()} block then the error goes away

Reproduction

REPL (Error won't show up in the REPL, you may need to copy it over to VS Code)

Expected behaviour

Implicit children get detected correctly

System Info

• OS: MacOS
• IDE: VSCode

Which package is the issue about?

No response

Additional Information, eg. Screenshots

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Not directly related to the bug, but I'm wondering if Svelte is going to provide some sort of Snippet type helper. For the time being, I'm using this:

type Snippet<T extends any[] = []> = (...args: T) => void;

// No parameters
type Children = Snippet // becomes () => void
// Parameters
type Row = Snippet<[item: T]> // becomes (item: T) => void

It's not really shorter than just writing out the actual function type, but it makes it more obvious which props are snippets and which aren't when typing $props

[dummdidumm]

A snippet helper will be added in the next release, and language tools will error if you don't use it to type the snippet props (at the @render location) sveltejs/svelte#9584

[eddiemcconkie]

@dummdidumm That's great! I didn't realize until now that snippets can't take more than one argument. Looks like my type helper was a little over-engineered 😅