Fix dashed idents being parsed as type selectors in pseudo-element functions

[bartveneman]

Summary

Fixed a parsing issue where dashed identifiers (CSS custom property names like --my-ident) were incorrectly being classified as type selectors when used as arguments to pseudo-element functions like ::view-transition-new() and ::view-transition-old().

Key Changes

• Added validation in parse_type_or_namespace_selector() to detect and reject dashed identifiers (starting with --) from being parsed as type selectors
• Imported CHAR_MINUS_HYPHEN constant to support the dashed identifier detection
• Added comprehensive test coverage for dashed idents in various pseudo-element contexts:
  • ::view-transition-new(--custom-name)
  • ::view-transition-old(--custom-name)
  • ::slotted(--custom-name)
  • Selector lists with multiple view-transition pseudo-elements
  • Verification that normal idents in pseudo-class functions like :is() still work correctly

Implementation Details

The fix checks if an identifier token starts with two consecutive hyphens (--), which is the CSS syntax for custom property names. When detected, the parser returns null instead of creating a TYPE_SELECTOR node, allowing the dashed ident to be handled appropriately by the pseudo-element function's argument parsing logic.

https://claude.ai/code/session_018QWguHVy1uENPc16qgjLcz

[codecov-commenter]

Bundle Report

Changes will increase total bundle size by 101 bytes (0.06%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
@projectwallace/css-parser-esm	159.26kB	101 bytes (0.06%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: @projectwallace/css-parser-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
parse-selector.js	101 bytes	19.98kB	0.51%

Files in parse-selector.js:

• ./src/parse-selector.ts → Total Size: 19.5kB

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.23%. Comparing base (b5fb784) to head (0f04e24).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #186   +/-   ##
=======================================
  Coverage   95.22%   95.23%           
=======================================
  Files          16       16           
  Lines        2869     2873    +4     
  Branches      803      806    +3     
=======================================
+ Hits         2732     2736    +4     
  Misses        137      137           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.