工具类

下面，我们就打包一个简单的工具函数，对此 js 文件分别进行 webpack 和 rollup 的打包

// index.js
function add(a, b) {
  return a + b;
}
export { add };

打包之前我们先配置一些 package.json

{
  "name": "tools",
  "version": "0.0.1",
  "description": "",
  "main": "dist/eff.cjs.js", //包文件入口位置 默认index.js，应该放commonJs(cjs)模块，以require的方式引入模块
  "module": "dist/eff.esm.js", //这里放es module(esm)模块，以import的方式引入模块应
  "jsnext:main": "dist/eff.esm.js", //跟module一样，只是jsnext:main是社区支持的。而 module 则是官方字段,大量社区插件只认识jsnext:main所以建议"module"和"jsnext:main"一起使用

  "browser": "dist/eff.browser.js", //可不通过编译直接在scrip src='dist/eff.browser.js'使用，但是打包时需要暴露出一个变量，可以直接在scrip标签中调用此变量
  "scripts": {
    "build:webpack": "webpack --config webpack.build.config.js", //使用webpack打包
    "build:rollup": "npx rollup -c rollup.config.js" //使用rollup打包
  }
}

使用 webpack

// webpack.build.config.js
const path = require("path");

var config = { module: {} };
var umd = Object.assign({}, config, {
  entry: {
    "eff.cjs": path.resolve(__dirname, "src/index.js"),
    "eff.browser": path.resolve(__dirname, "src/index.js"),
  },
  output: {
    path: path.resolve(__dirname, "./dist"),
    filename: "[name].js",
    library: {
      type: "umd",
    },
    globalObject: "this", // 定义全局变量,兼容node和浏览器运行，避免出现"window is not defined"的情况
  },
});
var esm = Object.assign({}, config, {
  entry: {
    "eff.esm": path.resolve(__dirname, "src/index.js"),
  },
  output: {
    path: path.resolve(__dirname, "./dist"),
    filename: "[name].js",
    library: {
      type: "module",
    },
  },
  experiments: {
    outputModule: true,
  },
});

// Return Array of Configurations
module.exports = [esm, umd];

使用 rollup

// rollup.config.js
import pkg from "./package.json";
import json from "rollup-plugin-json";
import resolve from "rollup-plugin-node-resolve";
import commonjs from "@rollup/plugin-commonjs";
import { babel } from "@rollup/plugin-babel";
import { terser } from "rollup-plugin-terser";
import filesize from "rollup-plugin-filesize";
const formatName = "eff";
export default {
  input: "./src/index.js",
  output: [
    {
      file: pkg.main,
      format: "cjs",
    },
    {
      file: pkg.module,
      format: "esm",
    },
    {
      file: pkg.browser,
      format: "umd",
      name: formatName,
    },
  ],
  plugins: [
    terser(),
    filesize(),
    json(),
    commonjs({
      include: /node_modules/,
    }),
    resolve({
      preferBuiltins: true,
      jsnext: true,
      main: true,
      brower: true,
    }),
    babel({ exclude: "node_modules/**" }),
  ],
};

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