Response to this Stack Overflow question — a demonstration of how Rollup's 'scope hoisting' works in practice.
Last active
January 2, 2023 05:05
-
-
Save Rich-Harris/79a02519fb00837e8d5a4b24355881c0 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
node_modules |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import b from './b.js'; | |
console.log( b ); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
export default 42; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
{ | |
"devDependencies": { | |
"rollup": "^0.41.6", | |
"webpack": "^2.3.3" | |
}, | |
"scripts": { | |
"rollup": "rollup a.js --format umd > rollup-bundle.js", | |
"webpack": "webpack a.js webpack-bundle.js" | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
(function (global, factory) { | |
typeof exports === 'object' && typeof module !== 'undefined' ? factory() : | |
typeof define === 'function' && define.amd ? define(factory) : | |
(factory()); | |
}(this, (function () { 'use strict'; | |
var b = 42; | |
console.log( b ); | |
}))); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/******/ (function(modules) { // webpackBootstrap | |
/******/ // The module cache | |
/******/ var installedModules = {}; | |
/******/ | |
/******/ // The require function | |
/******/ function __webpack_require__(moduleId) { | |
/******/ | |
/******/ // Check if module is in cache | |
/******/ if(installedModules[moduleId]) | |
/******/ return installedModules[moduleId].exports; | |
/******/ | |
/******/ // Create a new module (and put it into the cache) | |
/******/ var module = installedModules[moduleId] = { | |
/******/ i: moduleId, | |
/******/ l: false, | |
/******/ exports: {} | |
/******/ }; | |
/******/ | |
/******/ // Execute the module function | |
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__); | |
/******/ | |
/******/ // Flag the module as loaded | |
/******/ module.l = true; | |
/******/ | |
/******/ // Return the exports of the module | |
/******/ return module.exports; | |
/******/ } | |
/******/ | |
/******/ | |
/******/ // expose the modules object (__webpack_modules__) | |
/******/ __webpack_require__.m = modules; | |
/******/ | |
/******/ // expose the module cache | |
/******/ __webpack_require__.c = installedModules; | |
/******/ | |
/******/ // identity function for calling harmony imports with the correct context | |
/******/ __webpack_require__.i = function(value) { return value; }; | |
/******/ | |
/******/ // define getter function for harmony exports | |
/******/ __webpack_require__.d = function(exports, name, getter) { | |
/******/ if(!__webpack_require__.o(exports, name)) { | |
/******/ Object.defineProperty(exports, name, { | |
/******/ configurable: false, | |
/******/ enumerable: true, | |
/******/ get: getter | |
/******/ }); | |
/******/ } | |
/******/ }; | |
/******/ | |
/******/ // getDefaultExport function for compatibility with non-harmony modules | |
/******/ __webpack_require__.n = function(module) { | |
/******/ var getter = module && module.__esModule ? | |
/******/ function getDefault() { return module['default']; } : | |
/******/ function getModuleExports() { return module; }; | |
/******/ __webpack_require__.d(getter, 'a', getter); | |
/******/ return getter; | |
/******/ }; | |
/******/ | |
/******/ // Object.prototype.hasOwnProperty.call | |
/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); }; | |
/******/ | |
/******/ // __webpack_public_path__ | |
/******/ __webpack_require__.p = ""; | |
/******/ | |
/******/ // Load entry module and return exports | |
/******/ return __webpack_require__(__webpack_require__.s = 1); | |
/******/ }) | |
/************************************************************************/ | |
/******/ ([ | |
/* 0 */ | |
/***/ (function(module, __webpack_exports__, __webpack_require__) { | |
"use strict"; | |
/* harmony default export */ __webpack_exports__["a"] = (42); | |
/***/ }), | |
/* 1 */ | |
/***/ (function(module, __webpack_exports__, __webpack_require__) { | |
"use strict"; | |
Object.defineProperty(__webpack_exports__, "__esModule", { value: true }); | |
/* harmony import */ var __WEBPACK_IMPORTED_MODULE_0__b_js__ = __webpack_require__(0); | |
console.log( __WEBPACK_IMPORTED_MODULE_0__b_js__["a" /* default */] ); | |
/***/ }) | |
/******/ ]); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Great comparison. Thanks!