Answer by J.Lindebro for Normal CSS with CSS Modules

Try to separate the loaders into different rules. Like this:

{  test: /\.css$/,  use:  ['style-loader',  ]},{  test: /\.css$/,  use:  [    {       loader: 'css-loader',       options: {         importLoaders: 1,         modules: true,        localIdentName: '[name]__[local]___[hash:base64:5]'      }    },'postcss-loader'  ]}