BundleTransformer.CleanCss (nuget): BundleTransformer.CleanCss contains one minifier-adapter for minification of CSS code - `CleanCssMinifier`. `CleanCssMinifier` is based on the Clean-css (https://github.com/jakubpawlowicz/clean-css) version 4.1.11.  As a JS engine is used the JavaScript Engine Switcher library (https://github.com/Taritsyn/JavaScriptEngineSwitcher). For correct working of this module, you need to install one of the following NuGet packages: JavaScriptEngineSwitcher.Msie, JavaScriptEngineSwitcher.V8 or JavaScriptEngineSwitcher.ChakraCore.
Keywords: BundleTransformer|System.Web.Optimization|IBundleTransform|ASP.NET|CSS|Bundling|Minification|Minifier|Minify|Clean-css