入门rollup

overview

以一个最基本的demo展示rollup的功能/用法。

init project

mkdir exRollup
cd exRollup
npm init
npm i -d rollup
npm i -d rollup-plugin-json

编辑package.json

{
  ...
  "scripts": {
      ...
    "build:cjs": "rollup -c ./config/rollup.config.cjs.js",
    "build:esm": "rollup -c ./config/rollup.config.esm.js",
    "build:iife": "rollup -c ./config/rollup.config.iife.js",
    "build:umd": "rollup -c ./config/rollup.config.umd.js",
    "build:system": "rollup -c ./config/rollup.config.system.js",
    "build": "npm run build:cjs && npm run build:esm && npm run build:iife && npm run build:umd && npm run build:system"
  }
}

编辑配置文件

本示例中有4个配置文件。分别用于生成commonjs规范代码/esm规范代码/立即执行代码/umd规范代码。

// rollup.config.cjs.js
import json from 'rollup-plugin-json';

export default {
  input: 'src/index.js',
  output: {
    file: 'dist/bundle.cjs.js',
    format: 'cjs'
  },
  plugins: [ json() ]
};

// rollup.config.esm.js
import json from 'rollup-plugin-json';

export default {
  input: 'src/index.js',
  output: {
    file: 'dist/bundle.esm.js',
    format: 'esm'
  },
  plugins: [ json() ]
};

// rollup.config.iife.js
import json from 'rollup-plugin-json';

export default {
  input: 'src/index.js',
  output: {
    file: 'dist/bundle.iife.js',
    format: 'iife'
  },
  plugins: [ json() ]
};

// rollup.config.umd.js
import json from 'rollup-plugin-json';

export default {
  input: 'src/index.js',
  output: {
    file: 'dist/bundle.umd.js',
    format: 'umd'
  },
  plugins: [ json() ]
};

// rollup.config.system.js
System.register([], function (exports) {
  'use strict';
  return {
    execute: function () {

      exports('default', index);

      var version = "1.0.0";

      function add (a, b) {
          return a + b
      }

      function index () {
          console.log(`version: ${version}`);
      }
      let sum = exports('sum', function (a, b) {
          return add(a, b)
      });

    }
  };
});

编辑代码

// src/foo.js
export default function (a, b) {
    return a + b
}

// src/index.js
import {version} from '../package.json'
import add from './foo.js'
export default function () {
    console.log(`version: ${version}`)
}
export let sum = function (a, b) {
    return add(a, b)
}

执行打包

npm run build