webpack/examples/commonjs

This very simple example shows usage of CommonsJS.

The three files example.js, increment.js and math.js form a dependency chain. They use require(dependency) to declare dependencies.

You can see the output file that webpack creates by bundling them together in one file. Keep in mind that webpack adds comments to make reading this file easier. These commonent are removed when minimizing the file.

You can also see the info messages webpack prints to console (for both normal and minimized build).

example.js

var inc = require('./increment').increment;
var a = 1;
inc(a); // 2

increment.js

var add = require('./math').add;
exports.increment = function(val) {
    return add(val, 1);
};

math.js

exports.add = function() {
    var sum = 0, i = 0, args = arguments, l = args.length;
    while (i < l) {
        sum += args[i++];
    }
    return sum;
};

js/output.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] = {
/******/ 			exports: {},
/******/ 			id: moduleId,
/******/ 			loaded: false
/******/ 		};
/******/
/******/ 		// Execute the module function
/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/
/******/ 		// Flag the module as loaded
/******/ 		module.loaded = 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;
/******/
/******/ 	// __webpack_public_path__
/******/ 	__webpack_require__.p = "js/";
/******/
/******/ 	// Load entry module and return exports
/******/ 	return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/***/ function(module, exports, __webpack_require__) {

	var inc = __webpack_require__(/*! ./increment */ 1).increment;
	var a = 1;
	inc(a); // 2

/***/ },
/* 1 */
/*!**********************!*\
  !*** ./increment.js ***!
  \**********************/
/***/ function(module, exports, __webpack_require__) {

	var add = __webpack_require__(/*! ./math */ 2).add;
	exports.increment = function(val) {
	    return add(val, 1);
	};

/***/ },
/* 2 */
/*!*****************!*\
  !*** ./math.js ***!
  \*****************/
/***/ function(module, exports, __webpack_require__) {

	exports.add = function() {
	    var sum = 0, i = 0, args = arguments, l = args.length;
	    while (i < l) {
	        sum += args[i++];
	    }
	    return sum;
	};

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

Info

Uncompressed

Hash: 9939e07d4b0ecbfa0916
Version: webpack 1.3.2-beta4
Time: 63ms
    Asset  Size  Chunks             Chunk Names
output.js  2257       0  [emitted]  main
chunk    {0} output.js (main) 329 [rendered]
    > main [0] ./example.js 
    [0] ./example.js 69 {0} [built]
    [1] ./increment.js 98 {0} [built]
        cjs require ./increment [0] ./example.js 1:10-32
    [2] ./math.js 162 {0} [built]
        cjs require ./math [1] ./increment.js 1:10-27

Minimized (uglify-js, no zip)

Hash: 7649f5bb15f1f35689b1
Version: webpack 1.3.2-beta4
Time: 138ms
    Asset  Size  Chunks             Chunk Names
output.js   419       0  [emitted]  main
chunk    {0} output.js (main) 329 [rendered]
    > main [0] ./example.js 
    [0] ./example.js 69 {0} [built]
    [1] ./increment.js 98 {0} [built]
        cjs require ./increment [0] ./example.js 1:10-32
    [2] ./math.js 162 {0} [built]
        cjs require ./math [1] ./increment.js 1:10-27