vue.config.js

'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')
const appEnv = process.env.VUE_APP_ENV
const nodeEnv = process.env.NODE_ENV
const name = defaultSettings.title
const port = process.env.port || process.env.npm_config_port || 9527
const resolve = function(dir) {
  return path.join(__dirname, dir)
}

module.exports = {
  publicPath: './',
  outputDir: nodeEnv === 'development' ? 'dist' : /dev|test/.test(appEnv) ? `temp/${appEnv}` : 'dist',
  assetsDir: 'static',
  lintOnSave: nodeEnv === 'development',
  productionSourceMap: appEnv !== 'prod',
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // proxy: appEnv === 'mock' ? {
    //   [process.env.VUE_APP_BASE_API]: {
    //     target: `http://127.0.0.1:${port}/mock`,
    //     changeOrigin: true,
    //     pathRewrite: {
    //       ['^' + process.env.VUE_APP_BASE_API]: ''
    //     }
    //   }
    // } : false,
    before: appEnv === 'mock' ? require('./mock/index') : () => {}
  },
  configureWebpack: {
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    }
  },
  css: {
    loaderOptions: {
      // 给 sass-loader 传递选项
      sass: {
        prependData: `
          @import "~@/styles/variables.scss";
          @import '~@/styles/mixin.scss';
        `
      }
    }
  },
  chainWebpack(config) {
    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
            }
          }
        })
      config.optimization.runtimeChunk('single')
    })
  }
}