cli脚手架中webpack配置方法(2)

require('./check-versions')() //check-versions:调用检查版本的文件。加()代表直接调用该函数 process.env.NODE_ENV = 'production' //设置当前是生产环境 /** *下面定义常量引入插件 */ const ora = require('ora') //加载动画 const rm = require('rimraf') //删除文件 const path = require('path') const chalk = require('chalk') //对文案输出的一个彩色设置 const webpack = require('webpack') const config = require('../config') //默认读取下面的index.js文件 const webpackConfig = require('./webpack.prod.conf') const spinner = ora('building for production...') //调用start的方法实现加载动画,优化用户体验 spinner.start() //先删除dist文件再生成新文件,因为有时候会使用hash来命名,删除整个文件可避免冗余 rm(path.join(config.build.assetsRoot, config.build.assetsSubDirectory), err => { if (err) throw err webpack(webpackConfig, (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') 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' + ' Opening index.html over file:// won\'t work.\n' )) }) })

check-versions.js

该文件用于检测node和npm的版本,实现版本依赖

const chalk = require('chalk') const semver = require('semver') //对版本进行检查 const packageConfig = require('../package.json') const shell = require('shelljs') function exec (cmd) { //返回通过child_process模块的新建子进程,执行 Unix 系统命令后转成没有空格的字符串 return require('child_process').execSync(cmd).toString().trim() } const versionRequirements = [ { name: 'node', currentVersion: semver.clean(process.version), //使用semver格式化版本 versionRequirement: packageConfig.engines.node //获取package.json中设置的node版本 } ] if (shell.which('npm')) { versionRequirements.push({ name: 'npm', currentVersion: exec('npm --version'), // 自动调用npm --version命令,并且把参数返回给exec函数,从而获取纯净的版本号 versionRequirement: packageConfig.engines.npm }) } module.exports = function () { const warnings = [] for (let i = 0; i < versionRequirements.length; i++) { const mod = versionRequirements[i] if (!semver.satisfies(mod.currentVersion, mod.versionRequirement)) { //上面这个判断就是如果版本号不符合package.json文件中指定的版本号,就执行下面错误提示的代码 warnings.push(mod.name + ': ' + chalk.red(mod.currentVersion) + ' should be ' + chalk.green(mod.versionRequirement) ) } } if (warnings.length) { console.log('') console.log(chalk.yellow('To use this template, you must update following to modules:')) console.log() for (let i = 0; i < warnings.length; i++) { const warning = warnings[i] console.log(' ' + warning) } console.log() process.exit(1) } }

utils.js

utils是工具的意思,是一个用来处理css的文件。

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