PostCSS is a tool for transforming styles with JS plugins. These plugins can lint your CSS, support聽variables聽and聽mixins, transpile聽future聽CSS聽syntax, inline聽images, and聽more.
PostCSS is used by industry leaders including Wikipedia, Twitter, Alibaba, and JetBrains. The聽Autoprefixer and Stylelint聽PostCSS plugins聽are some聽of聽the聽most popular CSS tools.
Read full docs here.