Added link=“prefetch” tags

webpack.config.prod.js

@@ -3,6 +3,7 @@ var path = require('path');
 var webpack = require('webpack');
 var HtmlWebpackPlugin = require('html-webpack-plugin');
 var ExtractTextPlugin = require('extract-text-webpack-plugin');
+var ManifestPlugin = require('webpack-manifest-plugin');
 
 commonWebpackConfig = require('./webpack.config');
 
@@ -17,27 +18,23 @@ productionWebpackConfig = Object.assign(commonWebpackConfig, {
   },
   stats: "normal"
 });
-productionWebpackConfig.plugins.push(
+productionWebpackConfig.plugins = [
+  ...productionWebpackConfig.plugins,
+  new ManifestPlugin(),
   new HtmlWebpackPlugin({
     template: 'server/static/index.html',
-  })
-);
-productionWebpackConfig.plugins.push(
-  new ExtractTextPlugin({ filename: 'styles.[hash].css' })
-);
-productionWebpackConfig.plugins.push(
+  }),
+  new ExtractTextPlugin({ filename: 'styles.[hash].css' }),
   new webpack.optimize.UglifyJsPlugin({
     sourceMap: true,
-  })
-);
-productionWebpackConfig.plugins.push(
+  }),
   new webpack.DefinePlugin({
     'process.env': {
       URL: JSON.stringify(process.env.URL),
       NODE_ENV: JSON.stringify('production'),
       GOOGLE_ANALYTICS_ID: JSON.stringify(process.env.GOOGLE_ANALYTICS_ID),
     },
-  })
-);
+  }),
+];
 
 module.exports = productionWebpackConfig;