Hey,

In cssnano there are presets which can be used - https://cssnano.co/guides/presets.

I wanted to use them and tried the following config, but it didn't work.

postcss({
  extract: true,
  modules: true,
  namedExports: true,
  minimize: {
    preset: ['default', {
      discardComments: {
        removeAll: true
      }
    }]
  }
})

It seems like when extract is true, options are not passed to cssnano. When not extracted, options are passed.

It would be great have this in extract mode too.

rollup - 1.2.2
rollup-plugin-postcss - 2.0.3