update versions and improve webpack production compression

Author: vinogradov

package.json

@@ -12,25 +12,28 @@
   "license": "MIT",
   "dependencies": {
     "babel-core": "6.23.1",
-    "babel-loader": "6.3.2",
-    "babel-preset-env": "1.1.11",
+    "babel-loader": "6.4.0",
+    "babel-preset-env": "1.2.1",
     "babel-preset-react": "6.23.0",
     "clean-webpack-plugin": "0.1.15",
-    "css-loader": "0.26.2",
-    "eslint": "3.16.1",
+    "css-loader": "0.27.2",
+    "eslint": "3.17.1",
     "eslint-loader": "1.6.3",
     "eslint-plugin-react": "6.10.0",
-    "extract-text-webpack-plugin": "2.0.0",
+    "extract-text-webpack-plugin": "2.1.0",
     "file-loader": "0.10.1",
     "html-webpack-plugin": "2.28.0",
     "node-sass": "4.5.0",
     "react": "15.4.2",
     "react-dom": "15.4.2",
-    "sass-loader": "6.0.2",
+    "sass-loader": "6.0.3",
     "style-loader": "0.13.2",
     "webpack": "2.2.1"
   },
   "devDependencies": {
     "webpack-dev-server": "2.4.1"
+  },
+  "engines" : {
+    "node" : ">=7.5.0"
   }
 }

webpack.config.js

@@ -28,14 +28,18 @@ var plugins = [
 
 module.exports = function (env) {
     if (env && env.dist) {
+        // https://webpack.js.org/guides/production-build/
         var webpack = require('webpack');
 
-        var uglifyJsPlugin = new webpack.optimize.UglifyJsPlugin({
+        plugins.push(new webpack.optimize.UglifyJsPlugin({
+            beautify: false,
             mangle: true,
             comments: false
-        });
+        }));
 
-        plugins.push(uglifyJsPlugin);
+        plugins.push(new webpack.DefinePlugin({
+            'process.env.NODE_ENV': JSON.stringify('production')
+        }));
     }
 
     return {