refactor build

build/build.js

@@ -1,21 +1,22 @@
+'use strict'
 require('./check-versions')()
 
 process.env.NODE_ENV = 'production'
 
-var ora = require('ora')
-var rm = require('rimraf')
-var path = require('path')
-var chalk = require('chalk')
-var webpack = require('webpack')
-var config = require('../config')
-var webpackConfig = require('./webpack.prod.conf')
+const ora = require('ora')
+const rm = require('rimraf')
+const path = require('path')
+const chalk = require('chalk')
+const webpack = require('webpack')
+const config = require('../config')
+const webpackConfig = require('./webpack.prod.conf')
 
-var spinner = ora('building for production...')
+const spinner = ora('building for production...')
 spinner.start()
 
 rm(path.join(config.build.assetsRoot, config.build.assetsSubDirectory), err => {
   if (err) throw err
-  webpack(webpackConfig, function (err, stats) {
+  webpack(webpackConfig, (err, stats) => {
     spinner.stop()
     if (err) throw err
     process.stdout.write(stats.toString({
@@ -26,6 +27,11 @@ rm(path.join(config.build.assetsRoot, config.build.assetsSubDirectory), err => {
       chunkModules: false
     }) + '\n\n')
 
+    if (stats.hasErrors()) {
+      console.log(chalk.red('  Build failed with errors.\n'))
+      process.exit(1)
+    }
+
     console.log(chalk.cyan('  Build complete.\n'))
     console.log(chalk.yellow(
       '  Tip: built files are meant to be served over an HTTP server.\n' +