A fork of the original CSSLint Build v0.10.0 15-August-2013 01:07:22, heavily modified since then as a part of Stylus extension, now extracted to a separate repo.
- Supports modern CSS syntax including nesting, grids, complex selectors in pseudo selectors like
:has(). - Verifies function arguments including the modern
color-mix(),hwb(), etc. - Partly rewritten and mostly refactored to use modern JS.
- Small minified size: ~80kB parser with all the CSS specs and grammar, ~26kB rule checker.
- Somewhat optimized for speed: ~2x faster than stylelint with a dozen of simple rules and up to 10x in the subsequent runs while editing the CSS in the browser thanks to a primitive cache that reuses results from the previous run.
- New rules:
- known-pseudos: require known
:pseudoor::pseudoselector - shorthand-overrides: require a shorthand to precede an individual property
- simple-not: require a simple selector in
:not() - selector-newline: warn if descendant selector is on a new line
- style-rule-nesting: warn if CSS nesting is used
- known-pseudos: require known
- No support for CLI or extra formatters.
WIP:
- Get CSS specs from MDN or csstree or W3C. Doesn't seem entirely straightforward so far: there are mistakes/omissions in some definitions.
TODO:
- Make the embedded
/* csslint */comments work with caching. - Update the old CSSLint rules and remove the obsolete ones.
- Adopt the most popular/useful rules from other linters.
- Check validity of
calc()and other math functions. - Restore the JSDoc comments from the original CSSLint?