text: 'use strict'
  const LodashModuleReplacementPlugin = require('lodash-webpack-plugin')
  const CompressionPlugin = require('compression-webpack-plugin')
  const formatDate = require('date-fns').format
  const path = require('path')
  const defaultSettings = require('./src/config/settings.js')
  const { dependencies, devDependencies, version } = require('./package')
  
  // app name
  const name = defaultSettings.title || 'SF Admin Template' // page title
  
  function resolve(dir) {
    return path.join(__dirname, dir)
  }
  
  // inject info
  const __SFADMIN_INFO__ = {
    pkg: { dependencies, devDependencies, version, name },
    lastBuildTime: formatDate(new Date(), 'yyyy-MM-dd HH:mm:ss')
  }
  
  process.env.VUE_APP_SFADMIN_INFO = JSON.stringify(__SFADMIN_INFO__)
  
  // 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 methods:
  // port = 9528 npm run dev OR npm run dev --port = 9528
  const port = process.env.port || process.env.npm_config_port || 9528 // 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: process.env.NODE_ENV === 'development',
    productionSourceMap: false,
    /**
     * add vue-echarts fix
     * https://github.com/ecomfe/vue-echarts/blob/5.x/README.zh_CN.md#引入源码版本
     */
    transpileDependencies: ['vue-echarts', 'resize-detector'],
    devServer: {
      port: port,
      open: true,
      overlay: {
        warnings: false,
        errors: true
      },
      proxy: {
        '/api': {
          target: 'http://127.0.0.1:7001',
          pathRewrite: { '^/api': '' }
        },
        '/ws': {
          target: 'ws://127.0.0.1:7002',
          ws: true
        }
      }
    },
    configureWebpack: {
      // provide the app's title in webpack's name field, so that
      // it can be accessed in index.html to inject the correct title.
      name: name,
      resolve: {
        alias: {
          '@': resolve('src')
        }
      }
    },
    chainWebpack(config) {
      // 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'
        }
      ])
  
      // 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/icons'))
        .end()
      config.module
        .rule('icons')
        .test(/\.svg$/)
        .include.add(resolve('src/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$/
            }
          ])
          .end()
        // loadsh
        config.plugin('loadshReplace').use(new LodashModuleReplacementPlugin())
        // gzipped
        config.plugin('CompressionPlugin').use(
          new CompressionPlugin({
            algorithm: 'gzip',
            test: /\.(js|css)$/, // 匹配文件名
            threshold: 10240, // 对超过10k的数据压缩
            deleteOriginalAssets: false, // 不删除源文件
            minRatio: 0.8 // 压缩比
          })
        )
        // split
        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 // 表示是否使用已有的 chunk，如果为 true 则表示如果当前的 chunk 包含的模块已经被抽取出去了，那么将不会重新生成新的。
            }
          }
        })
        // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
        config.optimization.runtimeChunk('single')
      })
    }
  }
  