Functions and Mixins module treated as unknown at rules

[KTibow]

Describe the bug

Various at rules from the Functions and Mixins module aren't recognized, instead treated as unknown at rules. It's not clear how to ignore them.

/t/hi> pnpm check

> hi@0.0.1 check /tmp/hi
> svelte-kit sync && svelte-check --tsconfig ./tsconfig.json

Loading svelte-check in workspace: /tmp/hi
Getting Svelte diagnostics...

/tmp/hi/src/routes/+page.svelte:8:3
Warn: Unknown at rule @function (css)
<style>
  @function --echo(--size) {
    result: var(--size);

====================================
svelte-check found 0 errors and 1 warning in 1 file
⏎             

Reproduction

<style>
  @function --echo(--size) {
    result: var(--size);
  }
</style>

Expected behaviour

@function, @mixin, and @apply should be recognized, or at least it should be clear how to ignore these warnings.

System Info

• OS: Linux
• IDE: Zed but N/A

Which package is the issue about?

svelte-check

Additional Information, eg. Screenshots

No response

[jasonlyu123]

These are experimental feature that takes time to be supported by tools. In this case, it's vscode-css-languageservice. Tailwind's @apply is non-standard, so it is unlikely it'll ever be supported. As for ignoring the warning, there is currently no way to ignore unknown-at-rules.