fix(webpack): properly minifying

package.json

@@ -59,7 +59,7 @@
     "tslint-config-typings": "^0.3.1",
     "typescript": "^3.0.1",
     "uglifyjs-webpack-plugin": "^1.3.0",
-    "webpack": "^4.16.5",
+    "webpack": "^4.17.0",
     "webpack-cli": "^3.1.0"
   },
   "engines": {

webpack.config.js

@@ -3,22 +3,8 @@ const webpack = require('webpack');
 const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
 const version = require('./package.json').version;
 
-const plugins = [
-  new webpack.optimize.ModuleConcatenationPlugin(),
-];
-
 const prod = process.env.NODE_ENV === 'production';
 
-if (prod) {
-  plugins.push(new UglifyJSPlugin({
-    uglifyOptions: {
-      mangle: { keep_classnames: true },
-      compress: { keep_classnames: true },
-      output: { comments: false },
-    },
-  }));
-}
-
 // eslint-disable-next-line max-len
 const filename = `discord${process.env.VERSIONED ? `.${version}` : ''}${prod ? '.min' : ''}.js`;
 
@@ -53,10 +39,23 @@ module.exports = {
     child_process: 'empty',
     dgram: 'empty',
     __dirname: true,
-    process: false,
+    process: true,
     path: 'empty',
     Buffer: false,
     zlib: 'empty',
   },
-  plugins,
+  optimization: {
+    minimizer: [
+      new UglifyJSPlugin({
+        uglifyOptions: {
+          mangle: { keep_classnames: true },
+          compress: { keep_classnames: true },
+          output: { comments: false },
+        },
+      }),
+    ],
+  },
+  plugins: [
+    new webpack.optimize.ModuleConcatenationPlugin(),
+  ],
 };