fix(parse/css): improve parsing of @utility names

[dyc3]

Summary

Generated by gpt-5.2-codex

fixes #8708

Test Plan

added snapshots

Docs

[changeset-bot]

🦋 Changeset detected

Latest commit: a46b6e5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@biomejs/biome	Patch
@biomejs/cli-win32-x64	Patch
@biomejs/cli-win32-arm64	Patch
@biomejs/cli-darwin-x64	Patch
@biomejs/cli-darwin-arm64	Patch
@biomejs/cli-linux-x64	Patch
@biomejs/cli-linux-arm64	Patch
@biomejs/cli-linux-x64-musl	Patch
@biomejs/cli-linux-arm64-musl	Patch
@biomejs/wasm-web	Patch
@biomejs/wasm-bundler	Patch
@biomejs/wasm-nodejs	Patch
@biomejs/backend-jsonrpc	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[coderabbitai]

Walkthrough

Updates Tailwind at-rule parsing to accept functional utility names (e.g. px-*) by recognising known dimension-like identifiers and providing a recovery path for utility names up to the block start. Adds private helpers to parse utility identifiers and a test plus changelog entry for the px-* utility pattern.

Possibly related PRs

• fix(parse/tailwind): fix lexing inset-x, border-slate-500, and others #7975: Adjusts Tailwind utility-name recognition and lexer handling for dash-containing base names, touching the same identifier parsing area.

Suggested reviewers

• ematipico
• siketyan

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main fix: improving parsing of @utility names to handle functional utilities like px-*.
Description check	✅ Passed	The description references the linked issue (#8708) and explains the changes are for fixing Tailwind parameterized utility parsing.
Linked Issues check	✅ Passed	The PR directly addresses issue #8708 by implementing parser changes to accept parameterized utility names (px-, w-) that previously triggered syntax errors.
Out of Scope Changes check	✅ Passed	All changes are scoped to fixing the Tailwind utility parsing issue: parser logic updates, test cases, changelog entry, and test specifications.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing dyc3/fix-tw-css-utility-dash-star (a46b6e5) with main (fd33f86)}

Summary

✅ 29 untouched benchmarks
⏩ 126 skipped benchmarks¹

Footnotes

1. 126 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩