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webpack/examples/common-chunk-grandchildren/README.md

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This example illustrates how common modules from deep ancestors of an entry point can be split into a separate common chunk

  • pageA and pageB are dynamically required
  • pageC and pageA both require the reusableComponent
  • pageB dynamically requires PageC

You can see that webpack outputs five files/chunks:

  • output.js is the entry chunk and contains
    • the module system
    • chunk loading logic
    • the entry point example.js
  • 0.output.js is an additional chunk
    • module reusableComponent
  • 1.output.js is an additional chunk
    • module pageB
  • 2.output.js is an additional chunk
    • module pageA
  • 3.output.js is an additional chunk
    • module pageC

example.js

var main = function() {
	console.log("Main class");
	require.ensure([], () => {
		const page = require("./pageA");
		page();
	});
	require.ensure([], () => {
		const page = require("./pageB");
		page();
	});
};

main();

pageA.js

var reusableComponent = require("./reusableComponent");

module.exports = function() {
	console.log("Page A");
	reusableComponent();
};

pageB.js

module.exports = function() {
	console.log("Page B");
	require.ensure([], ()=>{
		const page = require("./pageC");
		page();
	});
};

pageC.js

var reusableComponent = require("./reusableComponent");

module.exports = function() {
	console.log("Page C");
	reusableComponent();
};

reusableComponent.js

module.exports = function() {
	console.log("reusable Component");
};

webpack.config.js

"use strict";
const path = require("path");

module.exports = {
	// mode: "development || "production",
	entry: {
		main: ["./example.js"]
	},
	optimization: {
		splitChunks: {
			minSize: 0 // This example is too small, in practice you can use the defaults
		},
		occurrenceOrder: true // To keep filename consistent between different modes (for example building only)
	},
	output: {
		path: path.resolve(__dirname, "dist"),
		filename: "output.js"
	}
};

dist/output.js

/******/ (function(modules) { /* webpackBootstrap */ }) 
/******/ (function(modules) { // webpackBootstrap
/******/ 	// install a JSONP callback for chunk loading
/******/ 	function webpackJsonpCallback(data) {
/******/ 		var chunkIds = data[0];
/******/ 		var moreModules = data[1];
/******/
/******/
/******/ 		// add "moreModules" to the modules object,
/******/ 		// then flag all "chunkIds" as loaded and fire callback
/******/ 		var moduleId, chunkId, i = 0, resolves = [];
/******/ 		for(;i < chunkIds.length; i++) {
/******/ 			chunkId = chunkIds[i];
/******/ 			if(installedChunks[chunkId]) {
/******/ 				resolves.push(installedChunks[chunkId][0]);
/******/ 			}
/******/ 			installedChunks[chunkId] = 0;
/******/ 		}
/******/ 		for(moduleId in moreModules) {
/******/ 			if(Object.prototype.hasOwnProperty.call(moreModules, moduleId)) {
/******/ 				modules[moduleId] = moreModules[moduleId];
/******/ 			}
/******/ 		}
/******/ 		if(parentJsonpFunction) parentJsonpFunction(data);
/******/
/******/ 		while(resolves.length) {
/******/ 			resolves.shift()();
/******/ 		}
/******/
/******/ 	};
/******/
/******/
/******/ 	// The module cache
/******/ 	var installedModules = {};
/******/
/******/ 	// object to store loaded and loading chunks
/******/ 	// undefined = chunk not loaded, null = chunk preloaded/prefetched
/******/ 	// Promise = chunk loading, 0 = chunk loaded
/******/ 	var installedChunks = {
/******/ 		1: 0
/******/ 	};
/******/
/******/
/******/
/******/ 	// script path function
/******/ 	function jsonpScriptSrc(chunkId) {
/******/ 		return __webpack_require__.p + "" + chunkId + ".output.js"
/******/ 	}
/******/
/******/ 	// 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;
/******/ 	}
/******/
/******/ 	// This file contains only the entry chunk.
/******/ 	// The chunk loading function for additional chunks
/******/ 	__webpack_require__.e = function requireEnsure(chunkId) {
/******/ 		var promises = [];
/******/
/******/
/******/ 		// JSONP chunk loading for javascript
/******/
/******/ 		var installedChunkData = installedChunks[chunkId];
/******/ 		if(installedChunkData !== 0) { // 0 means "already installed".
/******/
/******/ 			// a Promise means "currently loading".
/******/ 			if(installedChunkData) {
/******/ 				promises.push(installedChunkData[2]);
/******/ 			} else {
/******/ 				// setup Promise in chunk cache
/******/ 				var promise = new Promise(function(resolve, reject) {
/******/ 					installedChunkData = installedChunks[chunkId] = [resolve, reject];
/******/ 				});
/******/ 				promises.push(installedChunkData[2] = promise);
/******/
/******/ 				// start chunk loading
/******/ 				var script = document.createElement('script');
/******/ 				var onScriptComplete;
/******/
/******/ 				script.charset = 'utf-8';
/******/ 				script.timeout = 120;
/******/ 				if (__webpack_require__.nc) {
/******/ 					script.setAttribute("nonce", __webpack_require__.nc);
/******/ 				}
/******/ 				script.src = jsonpScriptSrc(chunkId);
/******/
/******/ 				onScriptComplete = function (event) {
/******/ 					// avoid mem leaks in IE.
/******/ 					script.onerror = script.onload = null;
/******/ 					clearTimeout(timeout);
/******/ 					var chunk = installedChunks[chunkId];
/******/ 					if(chunk !== 0) {
/******/ 						if(chunk) {
/******/ 							var errorType = event && (event.type === 'load' ? 'missing' : event.type);
/******/ 							var realSrc = event && event.target && event.target.src;
/******/ 							var error = new Error('Loading chunk ' + chunkId + ' failed.\n(' + errorType + ': ' + realSrc + ')');
/******/ 							error.type = errorType;
/******/ 							error.request = realSrc;
/******/ 							chunk[1](error);
/******/ 						}
/******/ 						installedChunks[chunkId] = undefined;
/******/ 					}
/******/ 				};
/******/ 				var timeout = setTimeout(function(){
/******/ 					onScriptComplete({ type: 'timeout', target: script });
/******/ 				}, 120000);
/******/ 				script.onerror = script.onload = onScriptComplete;
/******/ 				document.head.appendChild(script);
/******/ 			}
/******/ 		}
/******/ 		return Promise.all(promises);
/******/ 	};
/******/
/******/ 	// 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, { enumerable: true, get: getter });
/******/ 		}
/******/ 	};
/******/
/******/ 	// define __esModule on exports
/******/ 	__webpack_require__.r = function(exports) {
/******/ 		if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
/******/ 			Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
/******/ 		}
/******/ 		Object.defineProperty(exports, '__esModule', { value: true });
/******/ 	};
/******/
/******/ 	// create a fake namespace object
/******/ 	// mode & 1: value is a module id, require it
/******/ 	// mode & 2: merge all properties of value into the ns
/******/ 	// mode & 4: return value when already ns object
/******/ 	// mode & 8|1: behave like require
/******/ 	__webpack_require__.t = function(value, mode) {
/******/ 		if(mode & 1) value = __webpack_require__(value);
/******/ 		if(mode & 8) return value;
/******/ 		if((mode & 4) && typeof value === 'object' && value && value.__esModule) return value;
/******/ 		var ns = Object.create(null);
/******/ 		__webpack_require__.r(ns);
/******/ 		Object.defineProperty(ns, 'default', { enumerable: true, value: value });
/******/ 		if(mode & 2 && typeof value != 'string') for(var key in value) __webpack_require__.d(ns, key, function(key) { return value[key]; }.bind(null, key));
/******/ 		return ns;
/******/ 	};
/******/
/******/ 	// 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 = "dist/";
/******/
/******/ 	// on error function for async loading
/******/ 	__webpack_require__.oe = function(err) { console.error(err); throw err; };
/******/
/******/ 	var jsonpArray = window["webpackJsonp"] = window["webpackJsonp"] || [];
/******/ 	var oldJsonpFunction = jsonpArray.push.bind(jsonpArray);
/******/ 	jsonpArray.push = webpackJsonpCallback;
/******/ 	jsonpArray = jsonpArray.slice();
/******/ 	for(var i = 0; i < jsonpArray.length; i++) webpackJsonpCallback(jsonpArray[i]);
/******/ 	var parentJsonpFunction = oldJsonpFunction;
/******/
/******/
/******/ 	// Load entry module and return exports
/******/ 	return __webpack_require__(__webpack_require__.s = 0);
/******/ })
/************************************************************************/

/******/ ([
/* 0 */
/*!**************************!*\
  !*** multi ./example.js ***!
  \**************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

module.exports = __webpack_require__(/*! ./example.js */1);


/***/ }),
/* 1 */
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var main = function() {
	console.log("Main class");
	Promise.all(/*! require.ensure */[__webpack_require__.e(0), __webpack_require__.e(2)]).then((() => {
		const page = __webpack_require__(/*! ./pageA */ 2);
		page();
	}).bind(null, __webpack_require__)).catch(__webpack_require__.oe);
	__webpack_require__.e(/*! require.ensure */ 3).then((() => {
		const page = __webpack_require__(/*! ./pageB */ 3);
		page();
	}).bind(null, __webpack_require__)).catch(__webpack_require__.oe);
};

main();


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

dist/0.output.js

(window["webpackJsonp"] = window["webpackJsonp"] || []).push([[0],{

/***/ 4:
/*!******************************!*\
  !*** ./reusableComponent.js ***!
  \******************************/
/*! no static exports found */
/***/ (function(module, exports) {

module.exports = function() {
	console.log("reusable Component");
};


/***/ })

}]);

dist/2.output.js

(window["webpackJsonp"] = window["webpackJsonp"] || []).push([[2],{

/***/ 2:
/*!******************!*\
  !*** ./pageA.js ***!
  \******************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var reusableComponent = __webpack_require__(/*! ./reusableComponent */ 4);

module.exports = function() {
	console.log("Page A");
	reusableComponent();
};


/***/ })

}]);

dist/3.output.js

(window["webpackJsonp"] = window["webpackJsonp"] || []).push([[3],{

/***/ 3:
/*!******************!*\
  !*** ./pageB.js ***!
  \******************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

module.exports = function() {
	console.log("Page B");
	Promise.all(/*! require.ensure */[__webpack_require__.e(0), __webpack_require__.e(4)]).then((()=>{
		const page = __webpack_require__(/*! ./pageC */ 5);
		page();
	}).bind(null, __webpack_require__)).catch(__webpack_require__.oe);
};


/***/ })

}]);

dist/4.output.js

(window["webpackJsonp"] = window["webpackJsonp"] || []).push([[4],{

/***/ 5:
/*!******************!*\
  !*** ./pageC.js ***!
  \******************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var reusableComponent = __webpack_require__(/*! ./reusableComponent */ 4);

module.exports = function() {
	console.log("Page C");
	reusableComponent();
};


/***/ })

}]);

Info

Unoptimized

Hash: 0a1b2c3d4e5f6a7b8c9d
Version: webpack 4.29.6
      Asset       Size  Chunks             Chunk Names
0.output.js  337 bytes       0  [emitted]  
2.output.js  408 bytes       2  [emitted]  
3.output.js  542 bytes       3  [emitted]  
4.output.js  408 bytes       4  [emitted]  
  output.js   8.74 KiB       1  [emitted]  main
Entrypoint main = output.js
chunk    {0} 0.output.js 69 bytes <{1}> <{3}> ={2}= ={4}= [rendered] split chunk (cache group: default)
    > [1] ./example.js 3:1-6:3
    > [3] ./pageB.js 3:1-6:3
 [4] ./reusableComponent.js 69 bytes {0} [built]
     cjs require ./reusableComponent [2] ./pageA.js 1:24-54
     cjs require ./reusableComponent [5] ./pageC.js 1:24-54
chunk    {1} output.js (main) 248 bytes >{0}< >{2}< >{3}< [entry] [rendered]
    > main
 [0] multi ./example.js 28 bytes {1} [built]
     multi entry 
 [1] ./example.js 220 bytes {1} [built]
     single entry ./example.js [0] multi ./example.js main[0]
chunk    {2} 2.output.js 136 bytes <{1}> ={0}= [rendered]
    > [1] ./example.js 3:1-6:3
 [2] ./pageA.js 136 bytes {2} [built]
     cjs require ./pageA [1] ./example.js 4:15-33
chunk    {3} 3.output.js 133 bytes <{1}> >{0}< >{4}< [rendered]
    > [1] ./example.js 7:1-10:3
 [3] ./pageB.js 133 bytes {3} [built]
     cjs require ./pageB [1] ./example.js 8:15-33
chunk    {4} 4.output.js 136 bytes <{3}> ={0}= [rendered]
    > [3] ./pageB.js 3:1-6:3
 [5] ./pageC.js 136 bytes {4} [built]
     cjs require ./pageC [3] ./pageB.js 4:15-33

Production mode

Hash: 0a1b2c3d4e5f6a7b8c9d
Version: webpack 4.29.6
      Asset       Size  Chunks             Chunk Names
0.output.js  133 bytes       0  [emitted]  
2.output.js  138 bytes       2  [emitted]  
3.output.js  198 bytes       3  [emitted]  
4.output.js  138 bytes       4  [emitted]  
  output.js   2.13 KiB       1  [emitted]  main
Entrypoint main = output.js
chunk    {0} 0.output.js 69 bytes <{1}> <{3}> ={2}= ={4}= [rendered] split chunk (cache group: default)
    > [1] ./example.js 3:1-6:3
    > [3] ./pageB.js 3:1-6:3
 [4] ./reusableComponent.js 69 bytes {0} [built]
     cjs require ./reusableComponent [2] ./pageA.js 1:24-54
     cjs require ./reusableComponent [5] ./pageC.js 1:24-54
chunk    {1} output.js (main) 248 bytes >{0}< >{2}< >{3}< [entry] [rendered]
    > main
 [0] multi ./example.js 28 bytes {1} [built]
     multi entry 
 [1] ./example.js 220 bytes {1} [built]
     single entry ./example.js [0] multi ./example.js main[0]
chunk    {2} 2.output.js 136 bytes <{1}> ={0}= [rendered]
    > [1] ./example.js 3:1-6:3
 [2] ./pageA.js 136 bytes {2} [built]
     cjs require ./pageA [1] ./example.js 4:15-33
chunk    {3} 3.output.js 133 bytes <{1}> >{0}< >{4}< [rendered]
    > [1] ./example.js 7:1-10:3
 [3] ./pageB.js 133 bytes {3} [built]
     cjs require ./pageB [1] ./example.js 8:15-33
chunk    {4} 4.output.js 136 bytes <{3}> ={0}= [rendered]
    > [3] ./pageB.js 3:1-6:3
 [5] ./pageC.js 136 bytes {4} [built]
     cjs require ./pageC [3] ./pageB.js 4:15-33