add webpack-fail-plugin and make the build fail on emitError

reading docs and some issue discussions, this should be the default
behavior with webpack >= 2, but it doesn't seem to work without adding
webpack-fail-plugin
See e.g. TypeStrong/ts-loader#108

Author: giogonzo

package.json

@@ -84,6 +84,7 @@
     "typescript": "^2.4.1",
     "virtual-module-webpack-plugin": "^0.2.1",
     "webpack": "^3.1.0",
-    "webpack-dev-server": "^2.5.1"
+    "webpack-dev-server": "^2.5.1",
+    "webpack-fail-plugin": "^1.0.6"
   }
 }

src/scripts/webpack/webpack.build.js

@@ -3,6 +3,7 @@ import path from 'path';
 import CompressionPlugin from 'compression-webpack-plugin';
 import ExtractTextPlugin from 'extract-text-webpack-plugin';
 import HtmlWebpackPlugin from 'html-webpack-plugin';
+import webpackFailPlugin from 'webpack-fail-plugin';
 import { getHtmlPluginConfig } from './util';
 import WebpackBase from './webpack.base';
 
@@ -13,7 +14,8 @@ export default ({ config, paths, NODE_ENV, ...options }) => {
     // cause failed production builds to fail faster
     new webpack.NoEmitOnErrorsPlugin(),
     new HtmlWebpackPlugin(getHtmlPluginConfig(NODE_ENV, config.title)),
-    new ExtractTextPlugin({ filename: 'style.[hash].min.css' })
+    new ExtractTextPlugin({ filename: 'style.[hash].min.css' }),
+    webpackFailPlugin
   ];
 
   if (NODE_ENV === 'production') {