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(document, undefined) {
/******/	return function(modules) {
/******/		var installedModules = {}, installedChunks = {0:1};
/******/		function require(moduleId) {
/******/			if(typeof moduleId !== "number") throw new Error("Cannot find module '"+moduleId+"'");
/******/			if(installedModules[moduleId])
/******/				return installedModules[moduleId].exports;
/******/			var module = installedModules[moduleId] = {
/******/				exports: {}
/******/			};
/******/			modules[moduleId](module, module.exports, require);
/******/			return module.exports;
/******/		}
/******/		require.ensure = function(chunkId, callback) {
/******/			if(installedChunks[chunkId] === 1) return callback(require);
/******/			if(installedChunks[chunkId] !== undefined)
/******/				installedChunks[chunkId].push(callback);
/******/			else {
/******/				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+modules.a;
/******/				head.appendChild(script);
/******/			}
/******/		};
/******/		window[modules.b] = function(chunkId, moreModules) {
/******/			for(var moduleId in moreModules)
/******/				modules[moduleId] = moreModules[moduleId];
/******/			var callbacks = installedChunks[chunkId];
/******/			installedChunks[chunkId] = 1;
/******/			for(var i = 0; i < callbacks.length; i++)
/******/				callbacks[i](require);
/******/		};
/******/		return require(0);
/******/	}
/******/})(document)
/******/({a:".output.js",b:"webpackJsonp",c:"",
/******/0: function(module, exports, require) {

var a = require(/* a */4);
var b = require(/* b */1);
require.ensure(1, function(require) {
    require(/* b */1).xyz();
    var d = require(/* d */3);
});

/******/},
/******/
/******/1: function(module, exports, require) {

// module b

/******/},
/******/
/******/4: function(module, exports, require) {

// module a

/******/},
/******/
/******/})

1.output.js

/******/webpackJsonp(1, {
/******/2: function(module, exports, require) {

// module c

/******/},
/******/
/******/3: function(module, exports, require) {

// module d

/******/},
/******/
/******/})

Minimized

webpackJsonp(1,{3:function(a,b,c){},4:function(a,b,c){}})

Info

Uncompressed

Chunks: 2
Modules: 5
Modules including duplicates: 5
Modules pre chunk: 2.5
Modules first chunk: 3
     output.js:     2114 characters
   1.output.js:      200 characters
output.js
    0 .\example.js
       main
    1 .\node_modules\b.js
       require (2x) from .\example.js
    4 .\node_modules\a.js
       require (1x) from .\example.js
1.output.js
    2 .\node_modules\c.js
       async require (1x) from .\example.js
    3 .\node_modules\d.js
       async require (1x) from .\example.js

Minimized (uglify-js, no zip)

Chunks: 2
Modules: 5
Modules including duplicates: 5
Modules pre chunk: 2.5
Modules first chunk: 3
     output.js:      747 characters
   1.output.js:       57 characters
output.js
    0 .\example.js
       main
    1 .\node_modules\a.js
       require (1x) from .\example.js
    2 .\node_modules\b.js
       require (2x) from .\example.js
1.output.js
    3 .\node_modules\d.js
       async require (1x) from .\example.js
    4 .\node_modules\c.js
       async require (1x) from .\example.js