Stylelint - A mighty, modern linter that helps you avoid errors and enforce conventions in your styles

A mighty, modern linter that helps you avoid errors and enforce conventions in your styles. It has over 170 built-in rules to catch errors and enforce conventions. It understands modern CSS syntax and features. It is well tested with over 15000 unit tests. Stylelint is unopinionated so that you can customize it to your exact needs.