PostCSS Sassy Mixins PostCSS plugin for GWT/Google Closure Stylesheets like mixins. This plugin is based on postcss-sassy-mixins. Since Closure stylesheets feature another, arguably weird, syntax, this plugin changes its at-Rules and variable handling. Installation npm install postcss-closure-mixins Usage var postcss = require('postcss');var mixins = require('postcss-closure-mixins'); var options = { // options here}; var output = postcss() .use(mixins(options)) .process(css) .css; @defmixin border-radius(RADIUS) { -webkit-border-radius: RADIUS; -moz-border-radius: RADIUS; -ms-border-radius: RADIUS; border-radius: RADIUS;} .box { @mixin border-radius(10px); } Turns into: .box { -webkit-border-radius: 10px; -moz-border-radius: 10px; -ms-border-radius: 10px; border-radius: 10px;}