Rollup.js打包代码

Rollup 是一个 JavaScript 模块打包器

中文网：https://www.rollupjs.com/
英文网：https://www.rollupjs.org/

安装

npm install --global rollup

简单示例

main.js

console.log("hello rollup");

打包

rollup --help # 可以查看

# 浏览器
rollup main.js --file bundle.js --format iife

打包结果

bundle.js

(function () {
  "use strict";

  console.log("hello rollup");
})();

第一个 Buddle

src/main.js

// src/main.js
import foo from "./foo.js";

export default function () {
  console.log(foo);
}

src/foo.js

// src/foo.js
export default "hello world!";

打包

rollup src/main.js -o bundle.js -f cjs

使用配置文件

rollup.config.js

// rollup.config.js
export default {
  input: "src/main.js",
  output: {
    file: "bundle.js",
    format: "cjs",
  },
};

打包

# 默认使用rollup.config.js
rollup -c

插件

https://github.com/rollup/plugins/

npm init -y

npm install --save-dev rollup-plugin-json

从 json 文件中读取数据

package.json

{
  "name": "rollup-demo",
  "version": "1.0.0",
  "description": "",
  "main": "",
  "dependencies": {},
  "devDependencies": {
    "rollup-plugin-json": "^4.0.0"
  },
  "scripts": {
    "build": "rollup -c"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

src/main.js

// src/main.js
import { version } from "../package.json";

export default function () {
  console.log("version " + version);
}

配置文件加入 JSON 插件
rollup.config.js

// rollup.config.js
import json from "rollup-plugin-json";

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

编译

npm run build

编译结果

"use strict";

var version = "1.0.0";

// src/main.js

function main() {
  console.log("version " + version);
}

module.exports = main;

总结

配置打包和开发环境启动项

package.json

{
  "name": "rollup-demo",
  "version": "1.0.0",
  "description": "",
  "main": "",
  "dependencies": {},
  "devDependencies": {
    "rollup-plugin-json": "^4.0.0"
  },
  "scripts": {
    "dev": "rollup --config --watch",
    "build": "rollup --config"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

配置即使打包

rollup.config.js

// rollup.config.js
import json from "rollup-plugin-json";

export default {
  input: "src/main.js",

  output: {
    file: "bundle.js",
    format: "iife",
  },
  plugins: [json()],

  watch: {
    exclude: "node_modules/**",
  },
};

不错的文章
深入学习rollup来进行打包