Rollup.js打包代码

npm install --global rollup

console.log("hello rollup");

rollup --help # 可以查看
# 浏览器
rollup main.js --file bundle.js --format iife

(function () {
  "use strict";
  console.log("hello rollup");
})();

// src/main.js
import foo from "./foo.js";
export default function () {
  console.log(foo);
}

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

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

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

# 默认使用rollup.config.js
rollup -c

npm init -y
npm install --save-dev rollup-plugin-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
import { version } from "../package.json";
export default function () {
  console.log("version " + version);
}

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

npm run build

"use strict";
var version = "1.0.0";
// src/main.js
function main() {
  console.log("version " + version);
}
module.exports = main;

{
  "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"
}

// 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/**",
  },
};