Should it be possible to type snippet args using JSDoc?

[brunnerh]

Describe the bug

Snippets that are passed to components can be typed as parts of $props but how about snippets defined and used locally?

Workaround: Just use TS.

Reproduction

{#snippet test(/** @type {number} */ arg)}
	{arg}
{/snippet}

Expected identifier or destructure pattern

Logs

No response

System Info

System:
    OS: Windows 10 10.0.19045
    CPU: (12) x64 Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz
    Memory: 10.15 GB / 31.92 GB
  Binaries:
    Node: 18.19.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.19 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 9.2.0 - ~\AppData\Roaming\npm\npm.CMD
    pnpm: 8.6.9 - ~\AppData\Local\pnpm\pnpm.EXE
  Browsers:
    Chrome: 123.0.6312.124
    Edge: Spartan (), Chromium (123.0.2420.97), ChromiumDev ()
    Internet Explorer: 11.0.19041.3636

Severity

annoyance

[xeho91]

Alternative to consider - HTML comment:

<!-- 
Test function that takes a single string argument.
@param {string} arg - The string argument to be processed.
-->
{#snippet test(arg)}

{/snippet}

Credits goes to Hugos from Svelte Discord!

[dummdidumm]

Comments inside the template are now allowed, but we likely need some more adjustments in language-tools to make this work, therefore moving this issue there

[brunnerh]

Note on usage:

• /** @type {...} */ can now be used on snippet arguments.
• To flag type errors, // @ts-check appears to be necessary at the start of the <script>.