Adding Hot Module Replacement support

Author: alOneh

lib/config-generator.js

@@ -413,6 +413,10 @@ class ConfigGenerator {
         const outputPath = this.webpackConfig.outputPath.replace(this.webpackConfig.getContext() + '/', '');
         plugins.push(new AssetsOutputDisplayPlugin(outputPath, friendlyErrorsPlugin));
 
+        if (this.webpackConfig.useDevServer()) {
+            plugins.push(new webpack.HotModuleReplacementPlugin())
+        }
+
         return plugins;
     }
 
@@ -463,6 +467,7 @@ class ConfigGenerator {
             // avoid CORS concerns trying to load things like fonts from the dev server
             headers: { 'Access-Control-Allow-Origin': '*' },
             // required by FriendlyErrorsWebpackPlugin
+            hot: true,
             quiet: true,
             compress: true,
             historyApiFallback: true,