CSSnano is a modular minifier that aims to utilise small modules from the PostCSS ecosystem, rather than being an all-encompassing module that may be difficult to contribute to. Because it is written on top of PostCSS, it is able to do more than simple whitespace transforms – including advanced optimisations such as custom identifier reduction, z-index rebasing, and adjacent selector merging. What it does CSSnano takes your nicely formatted CSS and runs it through many…