rollup也是一款打包工具，比webpack要轻量许多，用于弥补gulp的无tree-shaking(这个技术可以移除没有使用的代码)是很好的选择，最大的用途是打包生产一个库文件，比如sdk.js之类。虽然webpack也可以做到，但是webpack较重，打包后的文件有部分webpack内部代码，如__webpack__require之类的函数定义，给人一种不干净的感觉。而rollup打出来的包就很干净，没有其他冗余代码。

鲸鱼 注
我用它打包过：

• 单个d3图形包

使用方式

通过插件导入commonjs模块

需要两个插件共用

• rollup-plugin-commonjs
• rollup-plugin-node-resolve

// rollup.config.js
import commonjs from 'rollup-plugin-commonjs';
import nodeResolve from 'rollup-plugin-node-resolve';

export default {
  input: 'main.js',
  output: {
    file: 'bundle.js',
    format: 'iife'
  },
  plugins: [
    nodeResolve({
      jsnext: true,
      main: true
    }),

    commonjs({
      // non-CommonJS modules will be ignored, but you can also
      // specifically include/exclude files
      include: 'node_modules/**',  // Default: undefined
      exclude: [ 'node_modules/foo/**', 'node_modules/bar/**' ],  // Default: undefined
      // these values can also be regular expressions
      // include: /node_modules/

      // search for files other than .js files (must already
      // be transpiled by a previous plugin!)
      extensions: [ '.js', '.coffee' ],  // Default: [ '.js' ]

      // if true then uses of `global` won't be dealt with by this plugin
      ignoreGlobal: false,  // Default: false

      // if false then skip sourceMap generation for CommonJS modules
      sourceMap: false,  // Default: true

      // explicitly specify unresolvable named exports
      // (see below for more details)
      namedExports: { './module.js': ['foo', 'bar' ] },  // Default: undefined

      // sometimes you have to leave require statements
      // unconverted. Pass an array containing the IDs
      // or a `id => boolean` function. Only use this
      // option if you know what you're doing!
      ignore: [ 'conditional-runtime-dependency' ]
    })
  ]
};

现实项目示例可以戳 vue源码这里

然后在配置的plugins里面使用

脚手架

roller-cli

参考

Rollup常用配置
rollup.js 文档
github
Rollup.js 实战学习笔记