vue-cli脚手架-bulid下的配置文件

/** * 验证版本 */'use strict'//chalk是一个颜色插件。可以通过const chalk = require('chalk')//semver一个版本控制插件const semver = require('semver')const packageConfig = require('../package.json')//shelljss是nodejs对与多进程的支持，是对于child_process封装const shell = require('shelljs')function exec (cmd) { return require('child_process').execSync(cmd).toString().trim()}const versionRequirements = [ {//对应node的版本  name: 'node',  //当前环境版本，semver.clean把当前环境版本信息转化规定格式，也是' =v1.2.3 '->'1.2.3'  currentVersion: semver.clean(process.version),  //要求版本，对应package.json的engines所配置的信息  versionRequirement: packageConfig.engines.node }]//npm环境中if (shell.which('npm')) { versionRequirements.push({  name: 'npm',  //执行方法得到版本号  currentVersion: exec('npm --version'),  versionRequirement: packageConfig.engines.npm })}module.exports = function () { const warnings = [] for (let i = 0; i < versionRequirements.length; i++) {  const mod = versionRequirements[i]  //如果版本号不符合package.json文件中指定的版本号，就执行下面的代码  if (!semver.satisfies(mod.currentVersion, mod.versionRequirement)) {   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) }}

/** * webpack开发环境：主要用来处理css-loader和vue-style-loader */'use strict'const path = require('path')const config = require('../config')//引入extract-text-webpack-plugin插件，用来将css提取到单独的css文件中const ExtractTextPlugin = require('extract-text-webpack-plugin')const packageConfig = require('../package.json')exports.assetsPath = function (_path) { //process.env.NODE_ENV在bulid.js中定义 //如果为生产环境assetsSubDirectory为“static”，否则也为“static” //config.build.assetsSubDirectory与config.dev.assetsSubDirectory都在config/index中定义 const assetsSubDirectory = process.env.NODE_ENV === 'production'  ? config.build.assetsSubDirectory  : config.dev.assetsSubDirectory //path.join和path.posix.join区别前者返回完整路径，后者返回完整路径的相对路径 //例：path.join是E:/shishans/blogsss/static，path.posix.join是static return path.posix.join(assetsSubDirectory, _path)}exports.cssLoaders = function (options) { options = options || {} //css-loader的基本配置 const cssLoader = {  loader: 'css-loader',  options: {   //option用于配置loder的   //是否开启cssMap，默认是false   //一般我们会压缩js或者css以节省宽带,但在开发压缩就很难调试   //所以用sourceMap进行关联，给出对应的sourceMap文件   sourceMap: options.sourceMap  } } const postcssLoader = {  loader: 'postcss-loader',  options: {   sourceMap: options.sourceMap  } } // generate loader string to be used with extract text plugin function generateLoaders (loader, loaderOptions) {  //将上面的基础配置放到一个数据中  const loaders = options.usePostCSS ? [cssLoader, postcssLoader] : [cssLoader]  //如果该函数传递了单独的loder就加入到loaders数组中例如：sass或者less之类的  if (loader) {   loaders.push({    //加载对应的loader    loader: loader + '-loader',    //es6方法Object.assign：主要用于合并对象的，浅拷贝    options: Object.assign({}, loaderOptions, {     sourceMap: options.sourceMap    })   })  }  // Extract CSS when that option is specified  // (which is the case during production build)  // extract自定义属性，用ExtractTextPlugin.extract控制是否把文件单独提取  // true：单独提取，false表示不提取  if (options.extract) {   return ExtractTextPlugin.extract({    use: loaders,    fallback: 'vue-style-loader'   })  } else {   //[].concat()方法用于连接数组   return ['vue-style-loader'].concat(loaders)  } } // https://vue-loader.vuejs.org/en/configurations/extract-css.html return {  css: generateLoaders(),//返回[cssLoader, vue-style-loader]  postcss: generateLoaders(),//返回[cssLoader, vue-style-loader]  less: generateLoaders('less'),//返回[cssLoader, vue-style-loader, less]  sass: generateLoaders('sass', { indentedSyntax: true }),  scss: generateLoaders('sass'),  stylus: generateLoaders('stylus'),  styl: generateLoaders('stylus') }}// Generate loaders for standalone style files (outside of .vue)// 这个方法主要处理import这种方式导入的文件类型的打包exports.styleLoaders = function (options) { const output = [] const loaders = exports.cssLoaders(options) for (const extension in loaders) {  const loader = loaders[extension]  output.push({   test: new RegExp('//.' + extension + '$'),   use: loader  }) } return output}//用于返回脚手架错误的函数exports.createNotifierCallback = () => { //使用node-notifier来发送桌面消息,包括应用状态改变以及错误信息 const notifier = require('node-notifier') return (severity, errors) => {  if (severity !== 'error') return  const error = errors[0]  const filename = error.file && error.file.split('!').pop()  notifier.notify({   title: packageConfig.name,   message: severity + ': ' + error.name,   subtitle: filename || '',   icon: path.join(__dirname, 'logo.png')  }) }}

/** * webpack开发环境和生成环境通用的配置 */'use strict'const path = require('path')const utils = require('./utils')const config = require('../config')const vueLoaderConfig = require('./vue-loader.conf')//获取对应文件路径的函数//因为该文件是在项目的二级文件build下，所以要加上../这样才能找到像src这样的目录function resolve (dir) { //join方法用于将多个字符串结合成一个路径字符串 //path在node中会经常用到可以仔细了解一下path的各种方法 //__dirname：获取当前文件所在目录的完整绝对路径 return path.join(__dirname, '..', dir)}//eslint用来检查我们写的js代码是否满足指定的规则const createLintingRule = () => ({ test: //.(js|vue)$/, loader: 'eslint-loader', enforce: 'pre', include: [resolve('src'), resolve('test')], options: {  formatter: require('eslint-friendly-formatter'),  emitWarning: !config.dev.showEslintErrorsInOverlay }})module.exports = { context: path.resolve(__dirname, '../'), entry: {  //入口文件是src下的main.js  app: './src/main.js' }, output: {  path: config.build.assetsRoot,  filename: '[name].js',  publicPath: process.env.NODE_ENV === 'production'   ? config.build.assetsPublicPath   : config.dev.assetsPublicPath }, resolve: {  //自动解析确定的扩展,在引入模块时不带扩展名  //例如：import somejs from "@/some"  extensions: ['.js', '.vue', '.json'],  alias: {   // 后面的$符号指精确匹配   // 也就是说只能使用 import vuejs from "vue" 这样的方式导入vue.esm.js文件   'vue$': 'vue/dist/vue.esm.js',   // resolve('src') 其实在这里就是项目根目录中的src目录   // 例如引用src目录下的some.js方法:import somejs from "@/some.js"   // 用@来代替../src   '@': resolve('src'),  } }, module: {  rules: [   ...(config.dev.useEslint ? [createLintingRule()] : []),   {    test: //.vue$/,    loader: 'vue-loader',    options: vueLoaderConfig   },   {    test: //.js$/,    loader: 'babel-loader',    include: [resolve('src'), resolve('test'), resolve('node_modules/webpack-dev-server/client')]   },   {    test: //.(png|jpe?g|gif|svg)(/?.*)?$/,    loader: 'url-loader',    options: {     limit: 10000,     name: utils.assetsPath('img/[name].[hash:7].[ext]')    }   },   {    test: //.(mp4|webm|ogg|mp3|wav|flac|aac)(/?.*)?$/,    loader: 'url-loader',    options: {     limit: 10000,     name: utils.assetsPath('media/[name].[hash:7].[ext]')    }   },   {    test: //.(woff2?|eot|ttf|otf)(/?.*)?$/,    loader: 'url-loader',    options: {     limit: 10000,     name: utils.assetsPath('fonts/[name].[hash:7].[ext]')    }   }  ] }, node: {  // prevent webpack from injecting useless setImmediate polyfill because Vue  // source contains it (although only uses it if it's native).  setImmediate: false,  // prevent webpack from injecting mocks to Node native modules  // that does not make sense for the client  dgram: 'empty',  fs: 'empty',  net: 'empty',  tls: 'empty',  child_process: 'empty' }}

/** * 此文件用于开发环境下的webpack配置 * 就本项目执行npm run dev 和 npm run start都会用到这个文件的配置 * 具体可以参考JavaScript中"scripts"的配置 */'use strict'const utils = require('./utils')const webpack = require('webpack')const config = require('../config')const merge = require('webpack-merge')const path = require('path')const baseWebpackConfig = require('./webpack.base.conf')const CopyWebpackPlugin = require('copy-webpack-plugin')//生成html文件const HtmlWebpackPlugin = require('html-webpack-plugin')//friendly-errors-webpack-plugin:把webpack的错误和日志搜集起来展现给用户const FriendlyErrorsPlugin = require('friendly-errors-webpack-plugin')const portfinder = require('portfinder')const HOST = process.env.HOSTconst PORT = process.env.PORT && Number(process.env.PORT)const devWebpackConfig = merge(baseWebpackConfig, { module: {  rules: utils.styleLoaders({ sourceMap: config.dev.cssSourceMap, usePostCSS: true }) }, // cheap-module-eval-source-map is faster for development // devtool是开发工具选项，用来指定如何生成sourcemap文件，cheap-module-eval-source-map此款soucemap文件性价比最高 // 生产环境：#source-map // 开发环境：#cheap-module-eval-source-map 编译消耗小 devtool: config.dev.devtool, // these devServer options should be customized in /config/index.js devServer: {  clientLogLevel: 'warning',  historyApiFallback: {   rewrites: [    { from: /.*/, to: path.posix.join(config.dev.assetsPublicPath, 'index.html') },   ],  },  hot: true,  contentBase: false, // since we use CopyWebpackPlugin.  compress: true,  host: HOST || config.dev.host,  port: PORT || config.dev.port,  open: config.dev.autoOpenBrowser,  overlay: config.dev.errorOverlay   ? { warnings: false, errors: true }   : false,  publicPath: config.dev.assetsPublicPath,  proxy: config.dev.proxyTable,  quiet: true, // necessary for FriendlyErrorsPlugin  watchOptions: {   poll: config.dev.poll,  } }, plugins: [  // DefinePlugin内置webpack插件，专门用来定义全局变量的  // 下面定义一个全局变量 process.env 并且值是如下  new webpack.DefinePlugin({   'process.env': require('../config/dev.env')  }),  // 这个插件帮助你实现无刷新加载，关于内部实现原理  new webpack.HotModuleReplacementPlugin(),  new webpack.NamedModulesPlugin(), // HMR shows correct file names in console on update.  new webpack.NoEmitOnErrorsPlugin(),  // https://github.com/ampedandwired/html-webpack-plugin  new HtmlWebpackPlugin({   filename: 'index.html',   template: 'index.html',   inject: true  }),  // copy custom static assets  new CopyWebpackPlugin([   {    from: path.resolve(__dirname, '../static'),    to: config.dev.assetsSubDirectory,    ignore: ['.*']   }  ]) ]})module.exports = new Promise((resolve, reject) => { portfinder.basePort = process.env.PORT || config.dev.port portfinder.getPort((err, port) => {  if (err) {   reject(err)  } else {   // publish the new Port, necessary for e2e tests   process.env.PORT = port   // add port to devServer config   devWebpackConfig.devServer.port = port   // Add FriendlyErrorsPlugin   devWebpackConfig.plugins.push(new FriendlyErrorsPlugin({    compilationSuccessInfo: {     messages: [`Your application is running here: http://${devWebpackConfig.devServer.host}:${port}`],    },    onErrors: config.dev.notifyOnErrors    ? utils.createNotifierCallback()    : undefined   }))   resolve(devWebpackConfig)  } })})