const resolveProjectRoot = require('@sanity/resolver').resolveProjectRoot
const webpackIntegration = require('@sanity/webpack-integration/v3')

module.exports = {
  plugins: webpackIntegration.getPostcssPlugins({
    basePath: resolveProjectRoot({sync: true})
  })
}

@@ -252,16 +252,128 @@
 : true%7D)
+,%0A    cssnext: %7B%0A      features: %7B%0A        customProperties: %7B%0A          preserve: false%0A        %7D%0A      %7D%0A    %7D
 %0A  %7D)%0A%7D%0A

Configure custom properties with preserve: false (#601)