cssnano

A modular CSS minifier built on top of PostCSS, version 7.1.7. It optimizes CSS by removing whitespace, comments, duplicated rules, and applying transformations like merging rules, converting values, and minifying selectors. Release cadence is frequent with monthly patch releases. Key differentiators: modular design with presets (default, advanced, etc.), extensive plugin ecosystem, and deep PostCSS integration. Supports Node.js >=18.12.0, ships TypeScript declarations, and requires postcss@^8.5.10 as a peer dependency.