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webpack/examples/harmony-interop/README.md

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example.js

// harmony module

// import from CommonJS module
import fs from "./fs";
import { readFile } from "./fs";
import * as fs2 from "./fs";
fs.readFile("file");
readFile("file");
fs2.readFile("file");

// import from harmony module
import { readFile as readFile2 } from "./reexport-commonjs";
readFile2("file");

// import a CommonJs module for side effects
import "./example2";

fs.js

// an example CommonJs module
// content is omitted for brevity
exports.readFile = function() {};
// using module.exports would be equivalent,
// webpack doesn't care which syntax is used

// AMD modules are also possible and equivalent to CommonJs modules

reexport-commonjs.js

// reexport a CommonJs module
export * from "./fs";
// Note that the default export doesn't reexport via export *
// (this is not interop-specific, it applies for every export *)

// Note: reexporting a CommonJs module is a special case,
// because in this module we have no information about exports

example2.js

// CommonJs module

// require a harmony module
var module = require("./harmony");

var defaultExport = module.default;
var namedExport = module.named;

harmony.js

// just some exports
export default "default";
export var named = "named";

dist/output.js

/******/ (() => { // webpackBootstrap
/******/ 	var __webpack_modules__ = ([
/* 0 */
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/*! namespace exports */
/*! exports [not provided] [no usage info] */
/*! runtime requirements: __webpack_require__, __webpack_require__.n, __webpack_require__.r, __webpack_exports__, __webpack_require__.* */
/***/ ((__unused_webpack_module, __webpack_exports__, __webpack_require__) => {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony import */ var _fs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./fs */ 1);
/* harmony import */ var _reexport_commonjs__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(/*! ./reexport-commonjs */ 2);
/* harmony import */ var _example2__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(/*! ./example2 */ 3);
/* harmony import */ var _example2__WEBPACK_IMPORTED_MODULE_2___default = /*#__PURE__*/__webpack_require__.n(_example2__WEBPACK_IMPORTED_MODULE_2__);
// harmony module

// import from CommonJS module



_fs__WEBPACK_IMPORTED_MODULE_0__.readFile("file");
(0,_fs__WEBPACK_IMPORTED_MODULE_0__.readFile)("file");
_fs__WEBPACK_IMPORTED_MODULE_0__.readFile("file");

// import from harmony module

(0,_reexport_commonjs__WEBPACK_IMPORTED_MODULE_1__.readFile)("file");

// import a CommonJs module for side effects



/***/ }),
/* 1 */
/*!***************!*\
  !*** ./fs.js ***!
  \***************/
/*! default exports */
/*! export readFile [provided] [no usage info] [missing usage info prevents renaming] */
/*! other exports [not provided] [no usage info] */
/*! runtime requirements: __webpack_exports__ */
/***/ ((__unused_webpack_module, exports) => {

// an example CommonJs module
// content is omitted for brevity
exports.readFile = function() {};
// using module.exports would be equivalent,
// webpack doesn't care which syntax is used

// AMD modules are also possible and equivalent to CommonJs modules


/***/ }),
/* 2 */
/*!******************************!*\
  !*** ./reexport-commonjs.js ***!
  \******************************/
/*! namespace exports */
/*! export readFile [provided] [no usage info] [missing usage info prevents renaming] -> ./fs.js .readFile */
/*! other exports [not provided] [no usage info] */
/*! runtime requirements: __webpack_require__, __webpack_exports__, __webpack_require__.d, __webpack_require__.r, __webpack_require__.* */
/***/ ((__unused_webpack_module, __webpack_exports__, __webpack_require__) => {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   "readFile": () => /* reexport safe */ _fs__WEBPACK_IMPORTED_MODULE_0__.readFile
/* harmony export */ });
/* harmony import */ var _fs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./fs */ 1);
// reexport a CommonJs module

// Note that the default export doesn't reexport via export *
// (this is not interop-specific, it applies for every export *)

// Note: reexporting a CommonJs module is a special case,
// because in this module we have no information about exports


/***/ }),
/* 3 */
/*!*********************!*\
  !*** ./example2.js ***!
  \*********************/
/*! unknown exports (runtime-defined) */
/*! runtime requirements: __webpack_require__ */
/***/ ((__unused_webpack_module, __unused_webpack_exports, __webpack_require__) => {

// CommonJs module

// require a harmony module
var module = __webpack_require__(/*! ./harmony */ 4);

var defaultExport = module.default;
var namedExport = module.named;


/***/ }),
/* 4 */
/*!********************!*\
  !*** ./harmony.js ***!
  \********************/
/*! namespace exports */
/*! export default [provided] [no usage info] [missing usage info prevents renaming] */
/*! export named [provided] [no usage info] [missing usage info prevents renaming] */
/*! other exports [not provided] [no usage info] */
/*! runtime requirements: __webpack_exports__, __webpack_require__.r, __webpack_require__.d, __webpack_require__.* */
/***/ ((__unused_webpack_module, __webpack_exports__, __webpack_require__) => {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export */ __webpack_require__.d(__webpack_exports__, {
/* harmony export */   "default": () => __WEBPACK_DEFAULT_EXPORT__,
/* harmony export */   "named": () => /* binding */ named
/* harmony export */ });
// just some exports
/* harmony default export */ const __WEBPACK_DEFAULT_EXPORT__ = ("default");
var named = "named";


/***/ })
/******/ 	]);
/* webpack runtime code */ 
/************************************************************************/
/******/ 	// The module cache
/******/ 	var __webpack_module_cache__ = {};
/******/ 	
/******/ 	// The require function
/******/ 	function __webpack_require__(moduleId) {
/******/ 		// Check if module is in cache
/******/ 		if(__webpack_module_cache__[moduleId]) {
/******/ 			return __webpack_module_cache__[moduleId].exports;
/******/ 		}
/******/ 		// Create a new module (and put it into the cache)
/******/ 		var module = __webpack_module_cache__[moduleId] = {
/******/ 			// no module.id needed
/******/ 			// no module.loaded needed
/******/ 			exports: {}
/******/ 		};
/******/ 	
/******/ 		// Execute the module function
/******/ 		__webpack_modules__[moduleId](module, module.exports, __webpack_require__);
/******/ 	
/******/ 		// Return the exports of the module
/******/ 		return module.exports;
/******/ 	}
/******/ 	
/************************************************************************/
/******/ 	/* webpack/runtime/compat get default export */
/******/ 	(() => {
/******/ 		// getDefaultExport function for compatibility with non-harmony modules
/******/ 		__webpack_require__.n = (module) => {
/******/ 			var getter = module && module.__esModule ?
/******/ 				() => module['default'] :
/******/ 				() => module;
/******/ 			__webpack_require__.d(getter, { a: getter });
/******/ 			return getter;
/******/ 		};
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/define property getters */
/******/ 	(() => {
/******/ 		// define getter functions for harmony exports
/******/ 		__webpack_require__.d = (exports, definition) => {
/******/ 			for(var key in definition) {
/******/ 				if(__webpack_require__.o(definition, key) && !__webpack_require__.o(exports, key)) {
/******/ 					Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });
/******/ 				}
/******/ 			}
/******/ 		};
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/hasOwnProperty shorthand */
/******/ 	(() => {
/******/ 		__webpack_require__.o = (obj, prop) => Object.prototype.hasOwnProperty.call(obj, prop)
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/make namespace object */
/******/ 	(() => {
/******/ 		// define __esModule on exports
/******/ 		__webpack_require__.r = (exports) => {
/******/ 			if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
/******/ 				Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
/******/ 			}
/******/ 			Object.defineProperty(exports, '__esModule', { value: true });
/******/ 		};
/******/ 	})();
/******/ 	
/************************************************************************/

/******/ 	// startup
/******/ 	// Load entry module
/******/ 	__webpack_require__(0);
/******/ 	// This entry module used 'exports' so it can't be inlined
/******/ })()
;

Info

Unoptimized

asset output.js 7.19 KiB [emitted] (name: main)
chunk output.js (main) 1.13 KiB (javascript) 931 bytes (runtime) [entry] [rendered]
  > ./example.js main
  dependent modules 785 bytes [dependent] 4 modules
  runtime modules 931 bytes 4 modules
  ./example.js 374 bytes [built] [code generated]
    [no exports]
    [used exports unknown]
    entry ./example.js main
webpack 5.0.0-beta.32 compiled successfully

Production mode

asset output.js 724 bytes [emitted] [minimized] (name: main)
chunk (runtime: main) output.js (main) 1.13 KiB (javascript) 668 bytes (runtime) [entry] [rendered]
  > ./example.js main
  dependent modules 484 bytes [dependent] 3 modules
  runtime modules 668 bytes 3 modules
  ./example.js + 1 modules 675 bytes [built] [code generated]
    [no exports]
    [no exports used]
    entry ./example.js main
webpack 5.0.0-beta.32 compiled successfully