I am not completely sure if this is a bug or feature request, but it is not possible now to skip some imported module if extact css plugin is used.

It seems that this plugin uses css-loader explicitly, so user does not have any way to tell webpack "do not load module bar.css" and trying to do so with IgnorePlugin leads to exception.

The whole story is here: https://stackoverflow.com/questions/58295539/webpack-how-to-exclude-certain-css-file-from-output