web-details/build/build.js

require('./check-versions')()
var server = require('pushstate-server')

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')

console.log(process.env.NODE_ENV)

var spinner = ora('building for ' + process.env.NODE_ENV + '...')
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
        }) + '\n\n')

        console.log(chalk.cyan('  Build complete.\n'))
        if (process.env.npm_config_preview) {
            const port = process.env.PORT
            server.start({
                port: port,
                directory: './dist',
                file: '/index.html'
            });
            console.log(`> Listening at ${process.env.BASE_URL}:${port}\
                            n`)
        }
    })
})