npm i

npm run build

.
├── build # 编译脚本目录
│   ├── build.js # 执行编译的Node.js脚本
│   └── rollup.config.js # rollup.js 编译配置
├── dist # 编译结果目录
│   └── index.js
├── example
│   └── index.html
├── package.json
└── src # 源码目录
    ├── index.js
    └── lib
        └── demo.js

## 安装 rollup.js 基础模块
npm i --save-dev rollup 


## 安装 rollup.js 编译ES6+的 babel 模块
npm i --save-dev @rollup/plugin-babel @babel/core @babel/preset-env

const path = require('path');
const { babel } = require('@rollup/plugin-babel');

const resolveFile = function(filePath) {
  return path.join(__dirname, '..', filePath)
}

module.exports = {
  input: resolveFile('src/index.js'),
  output: {
    file: resolveFile('dist/index.js'),
    format: 'umd',
  }, 
  plugins: [
    babel({
      "presets": ['@babel/preset-env']
    }),
  ],
}

const rollup = require('rollup');
const config = require('./rollup.config');

const inputOptions = config;
const outputOptions = config.output;

async function build() {
  // create a bundle
  const bundle = await rollup.rollup(inputOptions);

  console.log(`[INFO] 开始编译 ${inputOptions.input}`);  

  // generate code and a sourcemap
  const { code, map } = await bundle.generate(outputOptions);

  console.log(`[SUCCESS] 编译结束 ${outputOptions.file}`);  

  // or write the bundle to disk
  await bundle.write(outputOptions);
}

build();

{
  "scripts": {
    "build": "node ./build/build.js"
  },
}