详解vue-cli官方脚手架配置(6)

'use strict'
const path = require('path')
//跳转至utils
const utils = require('./utils')
const webpack = require('webpack')
//跳转至config
const config = require('../config')
const merge = require('webpack-merge')
//跳转至webpack.base.conf
const baseWebpackConfig = require('./webpack.base.conf')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const ExtractTextPlugin = require('extract-text-webpack-plugin')
//是用来压缩css代码
const OptimizeCSSPlugin = require('optimize-css-assets-webpack-plugin')
//用来压缩JS代码
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')

//跳转至prod.env
const env = require('../config/prod.env')

//以下同webpack.dev.conf
//跳转至webpack.dev.conf
const webpackConfig = merge(baseWebpackConfig, {
 module: {
  rules: utils.styleLoaders({
   sourceMap: config.build.productionSourceMap,
   extract: true,
   usePostCSS: true
  })
 },
 devtool: config.build.productionSourceMap ? config.build.devtool : false,
 output: {
  path: config.build.assetsRoot,
  filename: utils.assetsPath('js/[name].[chunkhash].js'),
  chunkFilename: utils.assetsPath('js/[id].[chunkhash].js')
 },
 plugins: [
  // http://vuejs.github.io/vue-loader/en/workflow/production.html
  new webpack.DefinePlugin({
   'process.env': env
  }),
  new UglifyJsPlugin({
   uglifyOptions: {
    compress: {
     warnings: false
    }
   },
   sourceMap: config.build.productionSourceMap,
   parallel: true
  }),
  // extract css into its own file
  new ExtractTextPlugin({
   filename: utils.assetsPath('css/[name].[contenthash].css'),
   // Setting the following option to `false` will not extract CSS from codesplit chunks.
   // Their CSS will instead be inserted dynamically with style-loader when the codesplit chunk has been loaded by webpack.
   // It's currently set to `true` because we are seeing that sourcemaps are included in the codesplit bundle as well when it's `false`,
   // increasing file size: https://github.com/vuejs-templates/webpack/issues/1110
   allChunks: true,
  }),
  // Compress extracted CSS. We are using this plugin so that possible
  // duplicated CSS from different components can be deduped.
  new OptimizeCSSPlugin({
   cssProcessorOptions: config.build.productionSourceMap
    ? { safe: true, map: { inline: false } }
    : { safe: true }
  }),
  // generate dist index.html with correct asset hash for caching.
  // you can customize output by editing /index.html
  // see https://github.com/ampedandwired/html-webpack-plugin
  new HtmlWebpackPlugin({
   filename: config.build.index,
   template: 'index.html',
   inject: true,
   minify: {
    removeComments: true,
    collapseWhitespace: true,
    removeAttributeQuotes: true
    // more options:
    // https://github.com/kangax/html-minifier#options-quick-reference
   },
   // necessary to consistently work with multiple chunks via CommonsChunkPlugin
   chunksSortMode: 'dependency'
  }),
  // keep module.id stable when vendor modules does not change
  new webpack.HashedModuleIdsPlugin(),
  // enable scope hoisting
  new webpack.optimize.ModuleConcatenationPlugin(),
  // split vendor js into its own file
  new webpack.optimize.CommonsChunkPlugin({
   name: 'vendor',
   minChunks (module) {
    // any required modules inside node_modules are extracted to vendor
    return (
     module.resource &&
     /\.js$/.test(module.resource) &&
     module.resource.indexOf(
      path.join(__dirname, '../node_modules')
     ) === 0
    )
   }
  }),
  // extract webpack runtime and module manifest to its own file in order to
  // prevent vendor hash from being updated whenever app bundle is updated
  new webpack.optimize.CommonsChunkPlugin({
   name: 'manifest',
   minChunks: Infinity
  }),
  // This instance extracts shared chunks from code splitted chunks and bundles them
  // in a separate chunk, similar to the vendor chunk
  // see: https://webpack.js.org/plugins/commons-chunk-plugin/#extra-async-commons-chunk
  new webpack.optimize.CommonsChunkPlugin({
   name: 'app',
   async: 'vendor-async',
   children: true,
   minChunks: 3
  }),

  // copy custom static assets
  new CopyWebpackPlugin([
   {
    from: path.resolve(__dirname, '../static'),
    to: config.build.assetsSubDirectory,
    ignore: ['.*']
   }
  ])
 ]
})

// 开启 gzip 的配置
if (config.build.productionGzip) {
 const CompressionWebpackPlugin = require('compression-webpack-plugin')
/*
压缩
更多配置：https://github.com/webpack-contrib/compression-webpack-plugin
*/
 webpackConfig.plugins.push(
  new CompressionWebpackPlugin({
   asset: '[path].gz[query]',
   algorithm: 'gzip',
   test: new RegExp(
    '\\.(' +
    config.build.productionGzipExtensions.join('|') +
    ')$'
   ),
   threshold: 10240,
   minRatio: 0.8
  })
 )
}

/*
webpack-bundle-analyzer 插件
解析出模块构成、以及各自的大小体积，最后显示为一个页面
地址： https://www.npmjs.com/package/webpack-bundle-analyzer
*/
if (config.build.bundleAnalyzerReport) {
 const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
 webpackConfig.plugins.push(new BundleAnalyzerPlugin())
}

module.exports = webpackConfig