Describe the bug

In Vite + Svelte 5, snippets with type annotations without script lang='ts', like the following

{#snippet bar(text: string)} {text} {/snippet} 

would trigger a unexpected token error, even with typescript support.

I am unsure that if there is a simliar issue opened for this problem (i am sorry if i overlooked), and also if this is the expected behavior. If error is expected, we should have a better error messages instead of a confusing 'unexpected token'.

Reproduction

Using the code:

{#snippet bar(text: string)} {text} {/snippet} 

with a proper typescript support.

Logs

None.

System Info

System: OS: Linux 6.16 Arch Linux CPU: (20) x64 12th Gen Intel(R) Core(TM) i9-12900HK Memory: 9.09 GB / 15.34 GB Container: Yes Shell: 5.3.3 - /bin/bash Binaries: Node: 24.8.0 - /usr/bin/node pnpm: 10.17.0 - /usr/bin/pnpm npmPackages: svelte: ^5.39.5 => 5.39.5

Severity

annoyance