PostCSS

PostCSS is an open-source tool for transforming CSS with JavaScript, supported by a community of contributors. Its plugin-based approach lets developers extend and adapt their CSS workflows, from improving readability to preparing stylesheets for different browsers and environments. Autoprefixer adds vendor prefixes according to browser support and usage data, while PostCSS Preset Env helps translate modern CSS features into syntax that targeted browsers or runtime environments can understand.

CSS Modules provide locally scoped class names to reduce conflicts caused by generic names. The project also supports stylelint, a modern CSS linter that helps teams enforce consistent conventions and catch stylesheet errors, including in SCSS and other CSS-like syntaxes. PostCSS offers setup guidance, documentation, plugin information, and an API for developers building integrations.

The project is distributed under the MIT License and welcomes community participation through contributions. It also invites users to support its work through Open Collective and GitHub Sponsors. Overall, PostCSS serves developers seeking a flexible foundation for transforming, checking, and managing CSS