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webpack/examples/common-chunk-and-vendor-chunk/README.md

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This example shows how to create an explicit vendor chunk as well as a common chunk for code shared among entry points. In this example, we have 3 entry points: pageA, pageB, and pageC. Those entry points share some of the same utility modules, but not others. This configuration will pull out any modules common to at least 2 bundles and place it in the common bundle instead, all while keeping the specified vendor libraries in their own bundle by themselves.

To better understand, here are the entry points and which utility modules they depend on:

  • pageA
    • utility1
    • utility2
  • pageB
    • utility2
    • utility3
  • pageC
    • utility2
    • utility3

Given this configuration, webpack will produce the following bundles:

  • vendor
    • webpack runtime
    • vendor1
    • vendor2
  • common
    • utility2
    • utility3
  • pageA
    • pageA
    • utility1
  • pageB
    • pageB
  • pageC
    • pageC

With this bundle configuration, you would load your third party libraries, then your common application code, then your page-specific application code.

webpack.config.js

var path = require("path");

module.exports = {
	// mode: "development" || "production",
	entry: {
		pageA: "./pageA",
		pageB: "./pageB",
		pageC: "./pageC"
	},
	optimization: {
		splitChunks: {
			cacheGroups: {
				commons: {
					chunks: "initial",
					minChunks: 2,
					maxInitialRequests: 5, // The default limit is too small to showcase the effect
					minSize: 0 // This is example is too small to create commons chunks
				},
				vendor: {
					test: /node_modules/,
					chunks: "initial",
					name: "vendor",
					priority: 10,
					enforce: true
				}
			}
		}
	},
	output: {
		path: path.join(__dirname, "dist"),
		filename: "[name].js"
	}
};

dist/vendor.js

(window["webpackJsonp"] = window["webpackJsonp"] || []).push([[1],{

/***/ 1:
/*!*********************************!*\
  !*** ./node_modules/vendor1.js ***!
  \*********************************/
/*! no static exports found */
/***/ (function(module, exports) {

module.exports = "vendor1";

/***/ }),

/***/ 5:
/*!*********************************!*\
  !*** ./node_modules/vendor2.js ***!
  \*********************************/
/*! no static exports found */
/***/ (function(module, exports) {

module.exports = "vendor2";

/***/ })

}]);

dist/commons~pageA~pageB~pageC.js

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

/***/ 3:
/*!*********************!*\
  !*** ./utility2.js ***!
  \*********************/
/*! no static exports found */
/***/ (function(module, exports) {

module.exports = "utility2";

/***/ })

}]);

dist/commons~pageB~pageC.js

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

/***/ 6:
/*!*********************!*\
  !*** ./utility3.js ***!
  \*********************/
/*! no static exports found */
/***/ (function(module, exports) {

module.exports = "utility3";

/***/ })

}]);

dist/pageA.js

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/******/ 		// then flag all "chunkIds" as loaded and fire callback
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/************************************************************************/

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

var vendor1 = __webpack_require__(/*! vendor1 */ 1);
var utility1 = __webpack_require__(/*! ./utility1 */ 2);
var utility2 = __webpack_require__(/*! ./utility2 */ 3);

module.exports = "pageA";


/***/ }),
/* 1 */,
/* 2 */
/*!*********************!*\
  !*** ./utility1.js ***!
  \*********************/
/*! no static exports found */
/***/ (function(module, exports) {

module.exports = "utility1";

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

dist/pageB.js

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/******/ 	// install a JSONP callback for chunk loading
/******/ 	function webpackJsonpCallback(data) {
/******/ 		var chunkIds = data[0];
/******/ 		var moreModules = data[1];
/******/ 		var executeModules = data[2];
/******/
/******/ 		// 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];
/******/ 			}
/******/ 		}
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/************************************************************************/
/******/ ({

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

var vendor2 = __webpack_require__(/*! vendor2 */ 5);
var utility2 = __webpack_require__(/*! ./utility2 */ 3);
var utility3 = __webpack_require__(/*! ./utility3 */ 6);

module.exports = "pageB";


/***/ })

/******/ });

dist/pageC.js

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/***/ 7:
/*!******************!*\
  !*** ./pageC.js ***!
  \******************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var utility2 = __webpack_require__(/*! ./utility2 */ 3);
var utility3 = __webpack_require__(/*! ./utility3 */ 6);

module.exports = "pageC";

/***/ })

/******/ });

Info

Unoptimized

Hash: 0a1b2c3d4e5f6a7b8c9d
Version: webpack 4.29.6
                       Asset       Size  Chunks             Chunk Names
commons~pageA~pageB~pageC.js  269 bytes       2  [emitted]  commons~pageA~pageB~pageC
      commons~pageB~pageC.js  269 bytes       4  [emitted]  commons~pageB~pageC
                    pageA.js    6.7 KiB       0  [emitted]  pageA
                    pageB.js    6.5 KiB       3  [emitted]  pageB
                    pageC.js   6.45 KiB       5  [emitted]  pageC
                   vendor.js  536 bytes       1  [emitted]  vendor
Entrypoint pageA = vendor.js commons~pageA~pageB~pageC.js pageA.js
Entrypoint pageB = vendor.js commons~pageA~pageB~pageC.js commons~pageB~pageC.js pageB.js
Entrypoint pageC = commons~pageA~pageB~pageC.js commons~pageB~pageC.js pageC.js
chunk    {0} pageA.js (pageA) 165 bytes ={1}= ={2}= [entry] [rendered]
    > ./pageA pageA
 [0] ./pageA.js 137 bytes {0} [built]
     single entry ./pageA  pageA
 [2] ./utility1.js 28 bytes {0} [built]
     cjs require ./utility1 [0] ./pageA.js 2:15-36
chunk    {1} vendor.js (vendor) 54 bytes ={0}= ={2}= ={3}= ={4}= [initial] [rendered] split chunk (cache group: vendor) (name: vendor)
    > ./pageA pageA
    > ./pageB pageB
    2 modules
chunk    {2} commons~pageA~pageB~pageC.js (commons~pageA~pageB~pageC) 28 bytes ={0}= ={1}= ={3}= ={4}= ={5}= [initial] [rendered] split chunk (cache group: commons) (name: commons~pageA~pageB~pageC)
    > ./pageA pageA
    > ./pageB pageB
    > ./pageC pageC
 [3] ./utility2.js 28 bytes {2} [built]
     cjs require ./utility2 [0] ./pageA.js 3:15-36
     cjs require ./utility2 [4] ./pageB.js 2:15-36
     cjs require ./utility2 [7] ./pageC.js 1:15-36
chunk    {3} pageB.js (pageB) 137 bytes ={1}= ={2}= ={4}= [entry] [rendered]
    > ./pageB pageB
 [4] ./pageB.js 137 bytes {3} [built]
     single entry ./pageB  pageB
chunk    {4} commons~pageB~pageC.js (commons~pageB~pageC) 28 bytes ={1}= ={2}= ={3}= ={5}= [initial] [rendered] split chunk (cache group: commons) (name: commons~pageB~pageC)
    > ./pageB pageB
    > ./pageC pageC
 [6] ./utility3.js 28 bytes {4} [built]
     cjs require ./utility3 [4] ./pageB.js 3:15-36
     cjs require ./utility3 [7] ./pageC.js 2:15-36
chunk    {5} pageC.js (pageC) 102 bytes ={2}= ={4}= [entry] [rendered]
    > ./pageC pageC
 [7] ./pageC.js 102 bytes {5} [built]
     single entry ./pageC  pageC

Production mode

Hash: 0a1b2c3d4e5f6a7b8c9d
Version: webpack 4.29.6
                       Asset       Size  Chunks             Chunk Names
commons~pageA~pageB~pageC.js   96 bytes       0  [emitted]  commons~pageA~pageB~pageC
      commons~pageB~pageC.js   97 bytes       1  [emitted]  commons~pageB~pageC
                    pageA.js   1.52 KiB       3  [emitted]  pageA
                    pageB.js   1.49 KiB       4  [emitted]  pageB
                    pageC.js   1.48 KiB       5  [emitted]  pageC
                   vendor.js  134 bytes       2  [emitted]  vendor
Entrypoint pageA = vendor.js commons~pageA~pageB~pageC.js pageA.js
Entrypoint pageB = vendor.js commons~pageA~pageB~pageC.js commons~pageB~pageC.js pageB.js
Entrypoint pageC = commons~pageA~pageB~pageC.js commons~pageB~pageC.js pageC.js
chunk    {0} commons~pageA~pageB~pageC.js (commons~pageA~pageB~pageC) 28 bytes ={1}= ={2}= ={3}= ={4}= ={5}= [initial] [rendered] split chunk (cache group: commons) (name: commons~pageA~pageB~pageC)
    > ./pageA pageA
    > ./pageB pageB
    > ./pageC pageC
 [0] ./utility2.js 28 bytes {0} [built]
     cjs require ./utility2 [2] ./pageA.js 3:15-36
     cjs require ./utility2 [5] ./pageB.js 2:15-36
     cjs require ./utility2 [7] ./pageC.js 1:15-36
chunk    {1} commons~pageB~pageC.js (commons~pageB~pageC) 28 bytes ={0}= ={2}= ={4}= ={5}= [initial] [rendered] split chunk (cache group: commons) (name: commons~pageB~pageC)
    > ./pageB pageB
    > ./pageC pageC
 [1] ./utility3.js 28 bytes {1} [built]
     cjs require ./utility3 [5] ./pageB.js 3:15-36
     cjs require ./utility3 [7] ./pageC.js 2:15-36
chunk    {2} vendor.js (vendor) 54 bytes ={0}= ={1}= ={3}= ={4}= [initial] [rendered] split chunk (cache group: vendor) (name: vendor)
    > ./pageA pageA
    > ./pageB pageB
    2 modules
chunk    {3} pageA.js (pageA) 165 bytes ={0}= ={2}= [entry] [rendered]
    > ./pageA pageA
 [2] ./pageA.js 137 bytes {3} [built]
     single entry ./pageA  pageA
 [4] ./utility1.js 28 bytes {3} [built]
     cjs require ./utility1 [2] ./pageA.js 2:15-36
chunk    {4} pageB.js (pageB) 137 bytes ={0}= ={1}= ={2}= [entry] [rendered]
    > ./pageB pageB
 [5] ./pageB.js 137 bytes {4} [built]
     single entry ./pageB  pageB
chunk    {5} pageC.js (pageC) 102 bytes ={0}= ={1}= [entry] [rendered]
    > ./pageC pageC
 [7] ./pageC.js 102 bytes {5} [built]
     single entry ./pageC  pageC