Comparing CommonJS vs. ES modules

a.js

export function add( a, b ) { return a + b }

export function sum( list ) { return list.reduce( add, 0 ) }

b.js

export const values = [ 1, 2, 3, 4, 5 ]

basic-js.common.js

/******/ (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;
/******/
/******/ 	// 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 = 0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ (function(module, exports, __webpack_require__) {

"use strict";


var _a = __webpack_require__(1);

var _b = __webpack_require__(2);

console.log((0, _a.sum)(_b.values));

/***/ }),
/* 1 */
/***/ (function(module, exports, __webpack_require__) {

"use strict";


Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.add = add;
exports.sum = sum;
exports.mult = mult;
exports.product = product;
function add(a, b) {
  return a + b;
}

function sum(list) {
  return list.reduce(add, 0);
}

function mult(a, b) {
  return a * b;
}

function product(list) {
  return list.reduce(product, 1);
}

/***/ }),
/* 2 */
/***/ (function(module, exports, __webpack_require__) {

"use strict";


Object.defineProperty(exports, "__esModule", {
  value: true
});
const values = exports.values = [1, 2, 3, 4, 5];

/***/ })
/******/ ]);

basic-js.es.js

/******/ (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;
/******/
/******/ 	// 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 = 0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
Object.defineProperty(__webpack_exports__, "__esModule", { value: true });
/* harmony import */ var __WEBPACK_IMPORTED_MODULE_0__a_js__ = __webpack_require__(1);
/* harmony import */ var __WEBPACK_IMPORTED_MODULE_1__b_js__ = __webpack_require__(2);



console.log( Object(__WEBPACK_IMPORTED_MODULE_0__a_js__["a" /* sum */])( __WEBPACK_IMPORTED_MODULE_1__b_js__["a" /* values */] ) )


/***/ }),
/* 1 */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
/* unused harmony export add */
/* harmony export (immutable) */ __webpack_exports__["a"] = sum;
/* unused harmony export mult */
/* unused harmony export product */
function add( a, b ) { return a + b }

function sum( list ) { return list.reduce( add, 0 ) }

function mult( a, b ) { return a * b }

function product( list ) { return list.reduce( product, 1 ) }


/***/ }),
/* 2 */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
const values = [ 1, 2, 3, 4, 5 ]
/* harmony export (immutable) */ __webpack_exports__["a"] = values;



/***/ })
/******/ ]);

build.min.js

(function(c) {
  function d(f) {
    if (e[f]) return e[f].exports;
    var g = (e[f] = { i: f, l: !1, exports: {} });
    return c[f].call(g.exports, g, g.exports, d), (g.l = !0), g.exports;
  }
  var e = {};
  return (
    (d.m = c),
    (d.c = e),
    (d.d = function(f, g, h) {
      d.o(f, g) ||
        Object.defineProperty(f, g, {
          configurable: !1,
          enumerable: !0,
          get: h
        });
    }),
    (d.n = function(f) {
      var g =
        f && f.__esModule
          ? function() {
              return f["default"];
            }
          : function() {
              return f;
            };
      return d.d(g, "a", g), g;
    }),
    (d.o = function(f, g) {
      return Object.prototype.hasOwnProperty.call(f, g);
    }),
    (d.p = ""),
    d((d.s = 0))
  );
})([
  function(c, d, e) {
    "use strict";
    Object.defineProperty(d, "__esModule", { value: !0 });
    var f = e(1),
      g = e(2);
    console.log(Object(f.a)(g.a));
  },
  function(c, d) {
    "use strict";
    function f(j, k) {
      return j + k;
    }
    d.a = function(j) {
      return j.reduce(f, 0);
    };
  },
  function(c, d) {
    "use strict";
    d.a = [1, 2, 3, 4, 5];
  }
]);

entry.js

import { sum } from './a.js'
import { values } from './b.js'

console.log( sum( values ) )