配置

env配置

配置环境变量，这里主要是配置环境变量，以及一些插件的配置，比如插件名称，接口地址等。

dev环境

开发的时候，默认填写插件的名称和平台ID，打包后，会自动替换成对应的插件名称和平台ID。

ENV = 'development'                         # 环境
VUE_APP_ADDON_NAME = 'gs_xhd'               # 插件名称
VUE_APP_PLAID = 16                          # 平台id
VUE_APP_BASE_API = 'https://www.xxx.com/'   # 接口地址

prod环境

ENV = 'production'                  # 环境
VUE_APP_ADDON_NAME = 'gs_xhd'       # 插件名称
VUE_APP_BASE_API = ''               # 接口地址

eslint配置

eslint 这个配置是为了解决在开发过程中，有些代码不符合规范，尽可能按照规范来写代码，这样可以避免一些不必要的错误。

vue.config.js配置

配置中将cdn引入，默认加载怪兽系统目录的资源，以及externals配置，这样可以在开发环境中使用cdn引入，减少打包体积，减少打包时间，同时也可以在生产环境中使用externals配置，将一些库不打包进去，而是在html中引入，这样可以减少打包体积，同时也可以减少打包时间。

'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

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

const name = defaultSettings.title || '加载中...' // page title
const IS_DEV = process.env.NODE_ENV === 'development'
const cdn = {
  css: [
    '/assets/lib/element-ui/index.css'
  ],
  js: [
    '/assets/js/lib/axios/axios.min.js',
    '/assets/js/lib/vue/2.7.10/vue.min.js',
    '/assets/js/lib/vue-router/vue-router.min.js',
    '/assets/js/lib/echarts/echarts.min.js',
    '/assets/js/lib/vuex/vuex.min.js',
    '/assets/lib/element-ui/index.js',
    '/assets/lib/addon/dkgs-sdk.min.js'
  ]
}
const externals = {
  // 属性名称 vue, 表示遇到 import xxx from 'vue' 这类引入 'vue'的，不去 node_modules 中找，而是去找全局变量 Vue（其他的为VueRouter、Vuex、axios、ELEMENT、echarts，注意全局变量是一个确定的值，不能修改为其他值，修改为其他大小写或者其他值会报错，若有异议可留言）
  vue: 'Vue',
  'vue-router': 'VueRouter',
  vuex: 'Vuex',
  axios: 'axios',
  'element-ui': 'ELEMENT',
  'echarts': 'echarts',
  '@form-create/element-ui': 'formCreate',
  'dkgs-sdk': 'dkgsSdk'
}

// 默认端口9528
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

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: process.env.NODE_ENV === 'development' ? '/' : '/assets/addons/' + process.env.VUE_APP_ADDON_NAME + '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: 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,
    output: { // 输出重构  打包编译后的 文件名称  【模块名称.版本号.时间戳】
      filename: `static/js/[name].dkyx.js`,
      chunkFilename: `static/js/[name].dkyx.js`
    },
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  css: {
    extract: {
      filename: `static/css/[name].dkyx.css`,
      chunkFilename: `static/css/[name].dkyx.css`
    }
  },
  chainWebpack(config) {
    if (!IS_DEV) {
      config.plugin('html').tap(args => {
        args[0].cdn = cdn
        return args
      })
      // 视为一个外部库，而不将它打包进来
      config.externals(externals)
    }
    // 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 废除
    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()
          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')
        }
      )
  }
}