text: 'use strict'
  const path = require('path')
  const defaultSettings = require('./src/settings.js')
  const CompressionPlugin = require('compression-webpack-plugin')
  
  function resolve(dir) {
    return path.join(__dirname, dir)
  }
  
  const isProd = process.env.NODE_ENV === 'production'
  
  const name = defaultSettings.title || 'vue Vant Tpl' // page title
  
  const port = 3000 // dev port
  
  module.exports = {
    publicPath: process.env.NODE_ENV === 'development' ? '/' : './',
    outputDir: 'dist',
    assetsDir: 'static',
    lintOnSave: process.env.NODE_ENV === 'development' ? 'error' : false,
    filenameHashing: true,
    productionSourceMap: false,
    devServer: {
      port: port,
      open: false,
      overlay: {
        warnings: false,
        errors: true
      },
    },
    css: {
      loaderOptions: {
        less: {
          additionalData: `@import "~@/assets/less/var.less";`
        }
      }
    },
    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')
        }
      },
      plugins: isProd ? [
        new CompressionPlugin({
          algorithm: 'gzip',
          test: /\.(js|css)(\?.*)?$/i,
          threshold: 10240, // 对超过10k的数据进行压缩
          minRatio: 0.8, // 只有压缩率小于这个值的资源才会被处理
          deleteOriginalAssets: false, // 删除原文件
        })
      ] : []
    },
    chainWebpack: (config) => {
      // it can improve the speed of the first screen, it is recommended to turn on preload
      // it can improve the speed of the first screen, it is recommended to turn on preload
      config.plugin('preload').tap(() => [
        {
          rel: 'preload',
          // to ignore runtime.js
          // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
          fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
          include: 'initial'
        }
      ])
  
      // when there are many pages, it will cause too many meaningless requests
      config.plugins.delete('prefetch')
  
      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-vantUI', // 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[\\/]_?vant(.*)/ // 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
                  }
                }
              }
            )
            config.optimization.runtimeChunk('single')
          }
        )
    }
  }
  