vue.config.js

'use strict'
const path = require('path')

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

const port = process.env.port || process.env.npm_config_port || 9521 // dev port

module.exports = {
  publicPath: process.env.VUE_APP_PUBLIC_PATH,
  outputDir: 'build',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    port: port,
    open: false,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      // 配置代理，解决跨域请求后台数据的问题
      '/api': {
        target: 'https://ets666.com', // 后台接口
        changeOrigin: 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.
    resolve: {
      alias: {
        '@': resolve('src'),
        rootpath: resolve('./'),
        assets: path.join(__dirname, 'src', 'assets')
      }
    }
  },
  chainWebpack: config => { // 修改webpack打包的入口文件。需要在根目录建两个对应入口js文件
    config.entry('app').clear().add('./src/main.js')
    config
      .plugin('html')
      .tap(args => {
        args[0].title = process.env.VUE_APP_TITLE + ' ' + process.env.VUE_APP_VERSION
        return args
      })

    // 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
            .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-plus(.*)/ // 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')
        }
      )
  }
}