Upgrade Webpacker to version 2.0 (#3729)

config/webpack/production.js

@@ -7,26 +7,27 @@ const sharedConfig = require('./shared.js');
 const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
 
 module.exports = merge(sharedConfig, {
-
-  devtool: 'source-map', // separate sourcemap file, suitable for production
-
   output: { filename: '[name]-[chunkhash].js' },
+  devtool: 'source-map', // separate sourcemap file, suitable for production
+  stats: 'normal',
 
   plugins: [
     new webpack.optimize.UglifyJsPlugin({
-      compress: true,
+      sourceMap: true,
       mangle: true,
 
+      compress: {
+        warnings: false,
+      },
+
       output: {
         comments: false,
       },
-
-      sourceMap: true,
     }),
     new CompressionPlugin({
       asset: '[path].gz[query]',
       algorithm: 'gzip',
-      test: /\.(js|css|svg|eot|ttf|woff|woff2)$/,
+      test: /\.(js|css|html|json|ico|svg|eot|otf|ttf)$/,
     }),
     new BundleAnalyzerPlugin({ // generates report.html and stats.json
       analyzerMode: 'static',