microsoft / microsoft/vscode-css-languageservice

Functions and Mixins module treated as unknown at rules

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Dominant language
TypeScript
Stars
384
Forks
217
Avg merge
3d 16h
Merged PRs (30d)
14

Description

Various at rules from the Functions and Mixins module aren't recognized, instead treated as unknown at rules. Specifically, @function, @mixin, and @apply aren't recognized.

Downstream issue: https://github.com/sveltejs/language-tools/issues/2913

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by locating the TypeScript CSS language service logic that classifies at-rules, then inspect how @function, @mixin, and @apply are handled. Verify the change with the service's existing validation coverage, ensuring these rules are no longer reported as unknown at-rules; the linked Svelte issue provides downstream context.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
58/100

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