vue.config.js

/**
 * Author: chao_code520@163.com
 * name: Aaron
 */
const path = require("path");
const GenerateAssetPlugin = require("generate-asset-webpack-plugin");
const cdnDependencies = require("./dependencies-cdn");

// 拼接路径
const resolve = dir => path.join(__dirname, dir);

process.env.VUE_APP_VERSION = require("./package.json").version;

const env = {
  VUE_APP_API: process.env.VUE_APP_API
};

// 设置不参与构建的库
// let externals = {};
// cdnDependencies.forEach(package => {
//   externals[package.name] = package.library;
// });

// 引入文件的 cdn 链接
const cdn = {
  css: cdnDependencies.map(e => e.css).filter(e => e),
  js: cdnDependencies.map(e => e.js).filter(e => e)
};

// 配置自动生成
/* eslint-disable no-new */
let createServerConfig = compilation => {
  var parseEnv = Object.assign({ _hash: compilation.hash }, env); // process.env 环境配置项
  Object.keys(parseEnv).forEach(function(key) {
    parseEnv[key] = parseEnv[key].replace(/"/g, "");
  });
  return JSON.stringify(parseEnv, null, 2);
};

module.exports = {
  publicPath: "./",
  // 生产环境下source map, 可以将其设置为 false 以加速生产环境构建
  productionSourceMap: false,
  // 打包生成目录，不同的环境打不同包名
  outputDir: "dist",
  assetsDir: "static",
  lintOnSave: process.env.NODE_ENV === "development",
  // 开启less全局变量
  css: {
    loaderOptions: {
      less: {
        javascriptEnabled: true
      }
    },
    extract: false
  },
  pluginOptions: {
    "style-resources-loader": {
      preProcessor: "less",
      patterns: [
        resolve("src/assets/css/common/_var.less"),
        resolve("src/assets/css/common/_mixins.less")
      ] // 引入全局样式变量
    }
  },
  devServer: {
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // detail: https://cli.vuejs.org/config/#devserver-proxy
    proxy: {
      "/api": {
        target: process.env.VUE_APP_API,
        changeOrigin: true,
        pathRewrite: {
          "^/api": ""
        }
      }
    }
  },
  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: process.env.VUE_APP_TITLE,
    // externals: externals,
    performance: {
      hints: false
    },
    plugins: [
      new GenerateAssetPlugin({
        filename: "./public/config.json",
        fn: (compilation, cb) => {
          cb(null, createServerConfig(compilation));
        },
        extraFiles: []
      })
    ],
    // 配置解析别名
    resolve: {
      alias: {
        "@base": resolve("src/components/Base")
      }
    }
  },
  chainWebpack: config => {
    // detail: https://github.com/PanJiaChen/vue-element-admin/blob/master/vue.config.js
    /**
     * 添加 CDN 参数到 htmlWebpackPlugin 配置中
     */
    config.plugin("html").tap(args => {
      if (process.env.NODE_ENV === "production") {
        args[0].cdn = cdn;
      } else {
        args[0].cdn = [];
      }
      return args;
    });
    /**
     * 删除懒加载模块的 prefetch preload，降低带宽压力
     * https://cli.vuejs.org/zh/guide/html-and-static-assets.html#prefetch
     * https://cli.vuejs.org/zh/guide/html-and-static-assets.html#preload
     * 而且预渲染时生成的 prefetch 标签是 modern 版本的，低版本浏览器是不需要的
     */
    config.plugins.delete("prefetch").delete("preload");
    // 解决 cli3 热更新失效 https://github.com/vuejs/vue-cli/issues/1559
    config.resolve.symlinks(true);

    // building config. webpack 4.0, 开发环境 sourcemap 不包含列信息
    config.when(process.env.NODE_ENV === "development", config =>
      config.devtool("cheap-source-map")
    );
    config.when(process.env.NODE_ENV === "production", 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, 只打包初始时依赖的第三方
          },
          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");
    });
  }
};