rollup介绍
- 开源类库优先选择
- 以 ESM 标准为目标的构建工具
- Tree Shaking
以命令行方式打包
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import path from "path";
console.log("hello rollop", path.join("", "hello"));
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rollup -i index.js --file dist.js --format umd
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- --file：打包输出文件
- --format：打包格式(umd, cjs, es, iife)
Tree Shaking
只会打包我们用到的代码，没有用到的不会打包
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export const funA = () => {
console.log("a");
};
export const funB = () => {
console.log("b");
};
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import { funA } from "./a";
funA();
console.log("hello rollup");
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rollup -i index.js --file dist.js --format es
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输出代码，代码进行了合并，并且只打包了用到的代码
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const funA = () => {
console.log("a");
};
funA();
console.log("hello rollop");
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Rollup 的命令行使用
index.js 文件
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import path from "path";
import { funA } from "./a";
funA();
console.log("hello rollop", path.join(__dirname, "/hello"));
export const x = 12;
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a.js 文件
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export const funA = () => {
console.log("a");
};
export const funB = () => {
console.log("b");
};
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命令行
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rollup [options] <entry file> 选项 输入文件
--help 帮助文档
-v, --version 查看版本
-i, --input <filename> 输入单个文件
-f, --format <format> 输出格式
-o, --file <output> 输出单个文件
-d, --dir <dirname> 输出多个文件
-w, --watch 监听文件改变，并重新打包
-c, --config <filename> 指定配置文件使用
--environment <values> 指定环境变量
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rollup -i index.js -i a.js --dir dist
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format 格式
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rollup -i index.js --format iife
index.js → stdout...
Creating a browser bundle that depends on "path". You might need to include https://github.com/snowpackjs/rollup-plugin-polyfill-node
var index = (function (exports, path) {
'use strict';
function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
var path__default = /*#__PURE__*/_interopDefaultLegacy(path);
const funA = () => {
console.log("a");
};
funA();
console.log("hello rollop", path__default["default"].join(__dirname, "/hello"));
const x = 12;
exports.x = x;
Object.defineProperty(exports, '__esModule', { value: true });
return exports;
})({}, path);
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rollup -i index.js --format cjs
index.js → stdout...
'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var path = require('path');
function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
var path__default = /*#__PURE__*/_interopDefaultLegacy(path);
const funA = () => {
console.log("a");
};
funA();
console.log("hello rollop", path__default["default"].join(__dirname, "/hello"));
const x = 12;
exports.x = x;
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rollup -i index.js --format es
index.js → stdout...
import path from 'path';
const funA = () => {
console.log("a");
};
funA();
console.log("hello rollop", path.join(__dirname, "/hello"));
const x = 12;
export { x };
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- umd 输出兼容 iife、cjs、es 格式的文件
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rollup -i index.js --format umd --name index
index.js → stdout...
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('path')) :
typeof define === 'function' && define.amd ? define(['exports', 'path'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.index = {}, global.path));
})(this, (function (exports, path) { 'use strict';
function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
var path__default = /*#__PURE__*/_interopDefaultLegacy(path);
const funA = () => {
console.log("a");
};
funA();
console.log("hello rollop", path__default["default"].join(__dirname, "/hello"));
const x = 12;
exports.x = x;
Object.defineProperty(exports, '__esModule', { value: true });
}));
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rollup -i index.js --file dist.js --format umd --name index
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rollup.config.js
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export default {
input: "index.js",
output: {
file: "dist.js",
format: "umd",
name: "index",
},
};
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rollup --config rollup.config.js
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设置/获取环境变量
在配置文件中获取
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// rollup.config.js
console.log(process.env.MODE);
const mode = process.env.MODE;
const isLocal = mode === "local";
export default {
input: "index.js",
output: {
file: "dist.js",
format: isLocal ? "es" : "umd",
name: "index",
},
};
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rollup --config rollup.config.js --environment MODE:local
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插件 plugins
插件官网：github.com/rollup/plug…
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import path from "path";
import { funA } from "./a";
import pkg from "./package.json";
console.log(pkg);
funA();
console.log("hello rollop", path.join(__dirname, "/hello"));
export const x = 12;
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npm install @rollup/plugin-json --save-dev
npm install rollup
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- 由于 json 插件是安装在本地，所以执行本地的 rollup 来找到对应的插件
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./node_modules/.bin/rollup --config rollup.config.js --plugin json
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