FIX: webpack CSS minifiction

package.json

@@ -102,6 +102,7 @@
     "uglify-js": "git://github.com/mishoo/UglifyJS2.git#harmony-v2.8.22",
     "uglifyjs-webpack-plugin": "^2.2.0",
     "url-loader": "^0.6.2",
+    "optimize-css-assets-webpack-plugin": "^5.0.3",
     "webpack": "^4.39.1",
     "webpack-cli": "^3.3.6",
     "webpack-dev-server": "^3.8.0",

webpack.config.prod.js

@@ -15,6 +15,7 @@ const autoprefixer = require('autoprefixer');
 const ExtractTextPlugin = require('extract-text-webpack-plugin');
 const FaviconsWebpackPlugin = require('favicons-webpack-plugin');
 const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
+const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
 
 let plugins = [
   new webpack.DefinePlugin({
@@ -52,6 +53,18 @@ let plugins = [
       windows: true
     }
   }),
+  new OptimizeCssAssetsPlugin({
+    //assetNameRegExp: /\.optimize\.css$/g,
+    cssProcessor: require('cssnano'),
+    cssProcessorPluginOptions: {
+      preset: ['default', {
+        discardComments: {
+          removeAll: true
+        }
+      }],
+    },
+    canPrint: true
+  }),
 ];
 
 // add themes favicons