PostCSS is a tool for transforming CSS with JS plugins. These plugins can support variables and mixins, transpile future CSS syntax, inline images, and more.
PostCSS is a tool in the Templating Languages & Extensions category of a tech stack.
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What are some alternatives to PostCSS?
Sass is an extension of CSS3, adding nested rules, variables, mixins, selector inheritance, and more. It's translated to well-formatted, standard CSS using the command line tool or a web-framework plugin.
It is a bunch of cool, fun, and cross-browser animations for you to use in your projects. Great for emphasis, home pages, sliders, and general just-add-water-awesomeness.
It is a CSS post processor. It combs through compiled CSS files to add or remove vendor prefixes like -webkit and -moz after checking the code.
The css-loader interprets @import and url() like import/require() and will resolve them.
Jetpack, React.js Boilerplate, tachyons, JSFiddle, Basscss and 7 more are some of the popular tools that integrate with PostCSS. Here's a list of all 12 tools that integrate with PostCSS.