TypeScript is not parsed correctly for snippet arguments

[abdel-17]

Describe the bug

There seems to be an issue with parsing object types for snippet parameters. This only happens when the <script> is below the snippet definition.

<!-- everything works when the script tag is at the top... -->
<!-- <script lang="ts"></script> -->

{#snippet foo(props: { props?: Record<string, unknown> })}{/snippet}

<!-- this won't error if you uncomment the snippet above -->
{#snippet bar(props: Record<string, unknown>)}{/snippet}

<!-- ...but not when it's at the bottom -->
<script lang="ts"></script>

EDIT: seems to happen in other cases too, not just snippets.

<CalendarPrimitive.Day
    bind:ref
    class={cn(...)}
    {...restProps}
/>

<script lang="ts">
import {Calendar as CalendarPrimitive} from 'bits-ui'

import {buttonVariants} from '$lib/components/ui/button/index.js'
import {cn} from '$lib/utils.js'

let {ref = $bindable(null), class: className, ...restProps}: CalendarPrimitive.DayProps = $props()
</script>

Reproduction

https://github.com/abdel-17/snippet-ts-bug

Expected behaviour

It should not error

System Info

• OS: [e.g. Linux]
• IDE: [e.g. Neovim]

Which package is the issue about?

No response

Additional Information, eg. Screenshots