text: 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')
  
  var 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) {
  
      spinner.stop()
      if (err) throw err
  
      process.stdout.write(stats.toString({
        colors: true,
        modules: false,
        children: false,
        chunks: false,
        chunkModules: false,
        // 添加构建日期和构建时间信息
        builtAt: true,
        // 添加时间信息
        timings: true,
        // 添加 webpack 版本信息
        version: true
      }) + '\n\n')
  
      if (stats.hasErrors()) {
        console.log(chalk.red('  Build failed with errors.\n'))
        process.exit(1)
      }
      var builtTime = (new Date(stats.endTime).getTime() - new Date(stats.startTime).getTime()) / 1000;
      console.log('time', builtTime + 's')
  
      console.log(chalk.cyan('  Build complete.\n'))
      console.log(chalk.yellow(
        '  Tip: built files are meant to be served over an HTTP server.\n' +
        '  Opening index.html over file:// won\'t work.\n'
      ))
    })
  })
  