Cleaning up imports, updating libs.

package.json

@@ -30,6 +30,7 @@
     "clean-webpack-plugin": "^3.0.0",
     "copy-webpack-plugin": "^5.1.1",
     "css-loader": "^3.4.2",
+    "css-url-relative-plugin": "^1.0.0",
     "favicons-webpack-plugin": "^2.1.0",
     "file-loader": "^4.3.0",
     "html-webpack-plugin": "^3.2.0",
@@ -39,6 +40,7 @@
     "postcss-loader": "^3.0.0",
     "sass-loader": "^8.0.2",
     "style-loader": "^1.1.3",
+    "terser-webpack-plugin": "^2.3.5",
     "webpack": "^4.41.5",
     "webpack-cli": "^3.3.10",
     "webpack-merge": "^4.2.2"
@@ -48,9 +50,6 @@
     "@fortawesome/free-solid-svg-icons": "^5.12.0",
     "@fortawesome/react-fontawesome": "^0.1.8",
     "cookies-js": "^1.2.3",
-    "css-url-relative-plugin": "^1.0.0",
-    "mobx": "^5.15.3",
-    "mobx-react": "^6.1.4",
     "react": "^16.12.0",
     "react-dom": "^16.12.0",
     "react-redux": "^7.1.3",

webpack.prod.js

@@ -21,6 +21,7 @@ const common = require('./webpack.common.js');
 const path = require('path');
 
 const OptimizeCssAssetsPlugin = require('optimize-css-assets-webpack-plugin');
+const TerserPlugin = require('terser-webpack-plugin');
 
 module.exports = function(env) {
     return merge(common, {
@@ -32,7 +33,8 @@ module.exports = function(env) {
                       'node_modules']
         },
         optimization:  {
-            minimizer: [new OptimizeCssAssetsPlugin({})],
+            minimize: true,
+            minimizer: [new OptimizeCssAssetsPlugin({}), new TerserPlugin()],
         },
     });
 }