vue.config.js

'use strict'
const path = require('path')
const defaultSettings = require('./src/settings')
const CompressionWebpackPlugin = require('compression-webpack-plugin')
const productionGzipExtensions = /\.(js|css|json|txt|html|ico|svg)(\?.*)?$/i

const title = defaultSettings.title || 'Vue Element Admin'

function resolve(dir) {
  return path.join(__dirname, dir)
}

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following method:
// port = 8080 npm run dev OR npm run dev --port = 8080
const port = process.env.port || process.env.npm_config_port || 5924 // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: true,
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // 原理：之所以出现跨域是因为浏览器为安全起见采取的同源策略的限制，即域名，协议，端口相同，
    // 所以我们在本地开发环境请求后台接口时浏览器会出现跨域的错误，
    // 配置本地代理是利用了服务器是不存在同源策略的限制这个原理来解决跨域问题的。
    // 当客户端发送请求时，请求本域服务器，再由本域服务器请求数据并响应返回给客户端。
    // 这样就相当于本地请求是使用服务器地址请求的，是本地和服务器同源 进行发送cookie
    proxy: {
      '/api': {
        target: 'http://localhost:5000/', // 要跨域的域名
        changeOrigin: true, // 是否开启跨域
        // ws: true, // proxy websockets
        // pathRewrite方法重写url
        pathRewrite: {
          '^/api': '/'
          // '^/api': '/api'
          // pathRewrite: {'^/api': '/'} 重写之后url为 http://192.168.1.16:8085/xxxx
          // pathRewrite: {'^/api': '/api'} 重写之后url为 http://192.168.1.16:8085/api/xxxx
        }
      },
      '/get': {
        target: 'http://localhost:4000', // 要跨域的域名
        changeOrigin: true // 是否开启跨域
      }
    }
  },
  configureWebpack: {
    name: title,
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    resolve: {
      alias: {
        '@': resolve('src'),
        'src': resolve('src')
      }
      // plugins: [
      //   new CompressionWebpackPlugin({
      //     filename: '[path].gz[query]', // 目标资源名称
      //     algorithm: 'gzip',
      //     test: productionGzipExtensions, // 处理所有匹配此 {RegExp} 的资源
      //     threshold: 10240, // 只处理比这个值大的资源。按字节计算(设置10K以上进行压缩)
      //     minRatio: 0.8, // 只有压缩率比这个值小的资源才会被处理
      //     deleteOriginalAssets: false // 是否删除源文件
      //   })
      // ]
    }
  },
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    config
      .plugin('html')
      .tap(args => {
        args[0].title = title
        return args
      })

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module
      .rule('svg')
      .exclude.add(resolve('src/assets/icons'))
      .end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/assets/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config.when(process.env.NODE_ENV !== 'development', config => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/
          }
        ])
        .end()
      config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: 'initial' // only package third parties that are initially dependent
          },
          elementUI: {
            name: 'chunk-elementUI', // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true
          }
        }
      })
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk('single')

      config
        .plugin('compression-webpack-plugin')
        .use(
          new CompressionWebpackPlugin({
            filename: '[path].gz[query]', // 目标资源名称
            algorithm: 'gzip',
            test: productionGzipExtensions, // 处理所有匹配此 {RegExp} 的资源
            threshold: 10240, // 只处理比这个值大的资源。按字节计算(设置10K以上进行压缩)
            minRatio: 0.8, // 只有压缩率比这个值小的资源才会被处理
            deleteOriginalAssets: false // 是否删除源文件
          })
        )
        .end()
    })
  }
}