postcss-assets-webpack-plugin

A Webpack plugin that applies PostCSS transformations to CSS assets emitted by MiniCssExtractPlugin after all files are compiled. Version 4.1.2 supports Webpack 4 and 5 with PostCSS 8, requiring Node >=10. Unlike postcss-loader which processes files individually, this plugin enables whole-bundle optimizations like media query packing and minimization. It is stable with infrequent releases and no known security issues.