webpack/examples/code-splitting/README.md

example.js

var a = require("a");
var b = require("b");
require.ensure(["c"], function(require) {
    require("b").xyz();
    var d = require("d");
});

js/output.js

(function(modules) { // webpackBootstrap
// The module cache
var installedModules = {};

// object to store loaded and loading chunks
// "0" means "already loaded"
// Array means "loading", array contains callbacks
var installedChunks = {0:0};

// The require function
function 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(null, module, module.exports, require);
	
	// Flag the module as loaded
	module.loaded = true;
	
	// Return the exports of the module
	return module.exports;
}

require.e = function requireEnsure(chunkId, callback) {
	// "0" is the signal for "already loaded"
	if(installedChunks[chunkId] === 0)
		return callback.call(null, require);
	
	// an array means "currently loading".
	if(installedChunks[chunkId] !== undefined) {
		installedChunks[chunkId].push(callback);
	} else {
		// start chunk loading
		installedChunks[chunkId] = [callback];
		var head = document.getElementsByTagName('head')[0];
		var script = document.createElement('script');
		script.type = 'text/javascript';
		script.charset = 'utf-8';
		script.src = modules.c + "" + chunkId + ".output.js";
		head.appendChild(script);
	}
};
require.modules = modules;
require.cache = installedModules;

// install a JSONP callback for chunk loading
window["webpackJsonp"] = function webpackJsonpCallback(chunkIds, moreModules) {
	// add "moreModules" to the modules object,
	// then flag all "chunkIds" as loaded and fire callback
	var moduleId, chunkId, callbacks = [];
	while(chunkIds.length) {
		chunkId = chunkIds.shift();
		if(installedChunks[chunkId])
			callbacks.push.apply(callbacks, installedChunks[chunkId]);
		installedChunks[chunkId] = 0;
	}
	for(moduleId in moreModules)
		modules[moduleId] = moreModules[moduleId];
	while(callbacks.length)
		callbacks.shift().call(null, require);
};

// Load entry module and return exports
return require(0);
})
/************************************************************************/
({
// __webpack_public_path__

c: "",
/***/ 0:
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/***/ function(module, exports, require) {

var a = require(/*! a */ 2);
var b = require(/*! b */ 1);
require.e/*nsure*/(1, function(require) {
    require(/*! b */ 1).xyz();
    var d = require(/*! d */ 4);
});

/***/ },

/***/ 1:
/*!****************!*\
  !*** ./~/b.js ***!
  \****************/
/***/ function(module, exports, require) {

// module b

/***/ },

/***/ 2:
/*!****************!*\
  !*** ./~/a.js ***!
  \****************/
/***/ function(module, exports, require) {

// module a

/***/ }
})

js/1.output.js

webpackJsonp([1],
{

/***/ 3:
/*!****************!*\
  !*** ./~/c.js ***!
  \****************/
/***/ function(module, exports, require) {

// module c

/***/ },

/***/ 4:
/*!****************!*\
  !*** ./~/d.js ***!
  \****************/
/***/ function(module, exports, require) {

// module d

/***/ }

}
)

Minimized

webpackJsonp([1],{3:function(){},4:function(){}});

Info

Uncompressed

Hash: 5543ff7619209e2d2e8aeebc12be7462
Version: webpack 0.10.0-beta1
Time: 42ms
      Asset  Size  Chunks  Chunk Names
  output.js  2844       0  main       
1.output.js   305       1             
chunk    {0} output.js (main) 166
    [0] ./example.js 144 [built] {0}
    [1] ./~/b.js 11 [built] {0}
        cjs require b [0] ./example.js 2:8-20
        cjs require b [0] ./example.js 4:4-16
    [2] ./~/a.js 11 [built] {0}
        cjs require a [0] ./example.js 1:8-20
chunk    {1} 1.output.js 22 {0} 
    [3] ./~/c.js 11 [built] {1}
        require.ensure item c [0] ./example.js 3:0-6:2
    [4] ./~/d.js 11 [built] {1}
        cjs require d [0] ./example.js 5:12-24

Minimized (uglify-js, no zip)

Hash: 5543ff7619209e2d2e8aeebc12be7462
Version: webpack 0.10.0-beta1
Time: 135ms
      Asset  Size  Chunks  Chunk Names
  output.js   744       0  main       
1.output.js    50       1             
chunk    {0} output.js (main) 166
    [0] ./example.js 144 [built] {0}
    [1] ./~/b.js 11 [built] {0}
        cjs require b [0] ./example.js 2:8-20
        cjs require b [0] ./example.js 4:4-16
    [2] ./~/a.js 11 [built] {0}
        cjs require a [0] ./example.js 1:8-20
chunk    {1} 1.output.js 22 {0} 
    [3] ./~/c.js 11 [built] {1}
        require.ensure item c [0] ./example.js 3:0-6:2
    [4] ./~/d.js 11 [built] {1}
        cjs require d [0] ./example.js 5:12-24