History

Tobias Koppers d28592e9da update examples		2021-08-20 08:12:50 +02:00
..
README.md	update examples	2021-08-20 08:12:50 +02:00
build.js	add multiple-entry-points example #15	2013-11-19 18:09:26 +01:00
common.js	plugin to extract common modules	2013-12-03 09:27:15 +01:00
pageA.html	better commons naming #128	2013-12-03 11:19:30 +01:00
pageA.js	plugin to extract common modules	2013-12-03 09:27:15 +01:00
pageAB.html	better way to bootstrap entry splits	2013-12-19 23:22:36 +01:00
pageB.js	plugin to extract common modules	2013-12-03 09:27:15 +01:00
shared.js	better commons naming #128	2013-12-03 11:19:30 +01:00
template.md	docs(multiple-entry-points): improve template.md	2020-03-27 08:26:17 +05:30
webpack.config.js	Merge tag 'v4.28.0' into next	2018-12-19 14:05:17 +01:00

README.md

This example shows how to use multiple entry points with a commons chunk.

In this example, you have two (HTML) pages pageA and pageB. You want to create individual bundles for each page. In addition to this, you want to create a shared bundle that contains all the modules used in both pages (assuming there are many/big modules in common). The pages also use Code Splitting to load a less used part of the features on demand.

You can see how to define multiple entry points via the entry option.

You can use

You can see the output files:

commons.js contains:
- module common.js which is used in both pages
pageA.js contains: (pageB.js is similar)
- the module system
- chunk loading logic
- the entry point pageA.js
- it would contain any other module that is only used by pageA
406.js is an additional chunk which is used by both pages. It contains:
- module shared.js

You can also see the info that is printed to console. It shows among others:

the generated files
the chunks with file, name, and id
- see lines starting with chunk
the modules that are in the chunks
the reasons why the modules are included
the reasons why a chunk is created
- see lines starting with >

pageA.js

var common = require("./common");
require(["./shared"], function(shared) {
	shared("This is page A");
});

pageB.js

var common = require("./common");
require.ensure(["./shared"], function(require) {
	var shared = require("./shared");
	shared("This is page B");
});

webpack.config.js

module.exports = {
	// mode: "development || "production",
	entry: {
		pageA: "./pageA",
		pageB: "./pageB"
	},
	optimization: {
		splitChunks: {
			cacheGroups: {
				commons: {
					name: "commons",
					chunks: "initial",
					minChunks: 2,
					minSize: 0
				}
			}
		},
		chunkIds: "deterministic" // To keep filename consistent between different modes (for example building only)
	}
};

pageA.html

<html>
	<head></head>
	<body>
		<script src="js/commons.js" charset="utf-8"></script>
		<script src="js/pageA.bundle.js" charset="utf-8"></script>
	</body>
</html>

dist/commons.js

(self["webpackChunk"] = self["webpackChunk"] || []).push([[351],[
/* 0 */,
/* 1 */
/*!*******************!*\
  !*** ./common.js ***!
  \*******************/
/*! unknown exports (runtime-defined) */
/*! runtime requirements: module */
/*! CommonJS bailout: module.exports is used directly at 1:0-14 */
/***/ ((module) => {

module.exports = "Common";

/***/ })
]]);

dist/pageA.js

/******/ (() => { // webpackBootstrap
/******/ 	var __webpack_modules__ = ([
/* 0 */
/*!******************!*\
  !*** ./pageA.js ***!
  \******************/
/*! unknown exports (runtime-defined) */
/*! runtime requirements: __webpack_require__, __webpack_require__.e, __webpack_require__.oe, __webpack_require__.* */
/***/ ((__unused_webpack_module, __unused_webpack_exports, __webpack_require__) => {

var common = __webpack_require__(/*! ./common */ 1);
__webpack_require__.e(/*! AMD require */ 52).then(function() { var __WEBPACK_AMD_REQUIRE_ARRAY__ = [__webpack_require__(/*! ./shared */ 3)]; (function(shared) {
	shared("This is page A");
}).apply(null, __WEBPACK_AMD_REQUIRE_ARRAY__);}).catch(__webpack_require__.oe);

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

/* webpack runtime code */

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/******/ 				if(installedChunkData !== 0) { // 0 means "already installed".
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/******/ 					// a Promise means "currently loading".
/******/ 					if(installedChunkData) {
/******/ 						promises.push(installedChunkData[2]);
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/******/ 						if(true) { // all chunks have JS
/******/ 							// setup Promise in chunk cache
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/******/ 							promises.push(installedChunkData[2] = promise);
/******/ 		
/******/ 							// start chunk loading
/******/ 							var url = __webpack_require__.p + __webpack_require__.u(chunkId);
/******/ 							// create error before stack unwound to get useful stacktrace later
/******/ 							var error = new Error();
/******/ 							var loadingEnded = (event) => {
/******/ 								if(__webpack_require__.o(installedChunks, chunkId)) {
/******/ 									installedChunkData = installedChunks[chunkId];
/******/ 									if(installedChunkData !== 0) installedChunks[chunkId] = undefined;
/******/ 									if(installedChunkData) {
/******/ 										var errorType = event && (event.type === 'load' ? 'missing' : event.type);
/******/ 										var realSrc = event && event.target && event.target.src;
/******/ 										error.message = 'Loading chunk ' + chunkId + ' failed.\n(' + errorType + ': ' + realSrc + ')';
/******/ 										error.name = 'ChunkLoadError';
/******/ 										error.type = errorType;
/******/ 										error.request = realSrc;
/******/ 										installedChunkData[1](error);
/******/ 									}
/******/ 								}
/******/ 							};
/******/ 							__webpack_require__.l(url, loadingEnded, "chunk-" + chunkId, chunkId);
/******/ 						} else installedChunks[chunkId] = 0;
/******/ 					}
/******/ 				}
/******/ 		};
/******/ 		
/******/ 		// no prefetching
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/******/ 		__webpack_require__.O.j = (chunkId) => (installedChunks[chunkId] === 0);
/******/ 		
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/******/ 				for(moduleId in moreModules) {
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/******/ 					}
/******/ 				}
/******/ 				if(runtime) var result = runtime(__webpack_require__);
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/******/ 			if(parentChunkLoadingFunction) parentChunkLoadingFunction(data);
/******/ 			for(;i < chunkIds.length; i++) {
/******/ 				chunkId = chunkIds[i];
/******/ 				if(__webpack_require__.o(installedChunks, chunkId) && installedChunks[chunkId]) {
/******/ 					installedChunks[chunkId][0]();
/******/ 				}
/******/ 				installedChunks[chunkIds[i]] = 0;
/******/ 			}
/******/ 			return __webpack_require__.O(result);
/******/ 		}
/******/ 		
/******/ 		var chunkLoadingGlobal = self["webpackChunk"] = self["webpackChunk"] || [];
/******/ 		chunkLoadingGlobal.forEach(webpackJsonpCallback.bind(null, 0));
/******/ 		chunkLoadingGlobal.push = webpackJsonpCallback.bind(null, chunkLoadingGlobal.push.bind(chunkLoadingGlobal));
/******/ 	})();
/******/ 	
/************************************************************************/

/******/ 	
/******/ 	// startup
/******/ 	// Load entry module and return exports
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/******/ 	var __webpack_exports__ = __webpack_require__.O(undefined, [351], () => (__webpack_require__(0)))
/******/ 	__webpack_exports__ = __webpack_require__.O(__webpack_exports__);
/******/ 	
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;

dist/pageB.js

/******/ (() => { // webpackBootstrap
/******/ 	var __webpack_modules__ = ({

/***/ 2:
/*!******************!*\
  !*** ./pageB.js ***!
  \******************/
/*! unknown exports (runtime-defined) */
/*! runtime requirements: __webpack_require__, __webpack_require__.e, __webpack_require__.* */
/***/ ((__unused_webpack_module, __unused_webpack_exports, __webpack_require__) => {

var common = __webpack_require__(/*! ./common */ 1);
__webpack_require__.e(/*! require.ensure */ 52).then((function(require) {
	var shared = __webpack_require__(/*! ./shared */ 3);
	shared("This is page B");
}).bind(null, __webpack_require__)).catch(__webpack_require__.oe);

/***/ })

/******/ 	});

/* webpack runtime code */

/************************************************************************/
/******/ 	// The module cache
/******/ 	var __webpack_module_cache__ = {};
/******/ 	
/******/ 	// The require function
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/******/ 									if(installedChunkData) {
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/******/ 										var realSrc = event && event.target && event.target.src;
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/******/ 										error.request = realSrc;
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/******/ 							};
/******/ 							__webpack_require__.l(url, loadingEnded, "chunk-" + chunkId, chunkId);
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;

dist/52.js

(self["webpackChunk"] = self["webpackChunk"] || []).push([[52],{

/***/ 3:
/*!*******************!*\
  !*** ./shared.js ***!
  \*******************/
/*! unknown exports (runtime-defined) */
/*! runtime requirements: module, __webpack_require__ */
/*! CommonJS bailout: module.exports is used directly at 2:0-14 */
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

var common = __webpack_require__(/*! ./common */ 1);
module.exports = function(msg) {
	console.log(msg);
};

/***/ })

}]);

Info

Unoptimized

asset pageA.js 10.7 KiB [emitted] (name: pageA)
asset pageB.js 10.7 KiB [emitted] (name: pageB)
asset 52.js 506 bytes [emitted]
asset commons.js 364 bytes [emitted] (name: commons) (id hint: commons)
Entrypoint pageA 11.1 KiB = commons.js 364 bytes pageA.js 10.7 KiB
Entrypoint pageB 11 KiB = commons.js 364 bytes pageB.js 10.7 KiB
chunk (runtime: pageA, pageB) 52.js 88 bytes [rendered]
  > ./shared ./pageA.js 2:0-4:2
  > ./pageB.js 2:0-5:2
  ./shared.js 88 bytes [built] [code generated]
    [used exports unknown]
    from origin ./pageB.js
      require.ensure item ./shared ./pageB.js 2:0-5:2
      cjs require ./shared ./pageB.js 3:14-33
    amd require ./shared ./pageA.js 2:0-4:2
    cjs self exports reference ./shared.js 2:0-14
chunk (runtime: pageB) pageB.js (pageB) 148 bytes (javascript) 5.92 KiB (runtime) [entry] [rendered]
  > ./pageB pageB
  runtime modules 5.92 KiB 7 modules
  ./pageB.js 148 bytes [built] [code generated]
    [used exports unknown]
    entry ./pageB pageB
chunk (runtime: pageA, pageB) commons.js (commons) (id hint: commons) 26 bytes [initial] [rendered] split chunk (cache group: commons) (name: commons)
  > ./pageA pageA
  > ./pageB pageB
  ./common.js 26 bytes [built] [code generated]
    [used exports unknown]
    cjs self exports reference ./common.js 1:0-14
    cjs require ./common ./pageA.js 1:13-32
    cjs require ./common ./pageB.js 1:13-32
    cjs require ./common ./shared.js 1:13-32
chunk (runtime: pageA) pageA.js (pageA) 105 bytes (javascript) 5.92 KiB (runtime) [entry] [rendered]
  > ./pageA pageA
  runtime modules 5.92 KiB 7 modules
  ./pageA.js 105 bytes [built] [code generated]
    [used exports unknown]
    entry ./pageA pageA
webpack 5.51.1 compiled successfully

Production mode

asset pageA.js 2.16 KiB [emitted] [minimized] (name: pageA)
asset pageB.js 2.13 KiB [emitted] [minimized] (name: pageB)
asset 52.js 116 bytes [emitted] [minimized]
asset commons.js 86 bytes [emitted] [minimized] (name: commons) (id hint: commons)
Entrypoint pageA 2.24 KiB = commons.js 86 bytes pageA.js 2.16 KiB
Entrypoint pageB 2.22 KiB = commons.js 86 bytes pageB.js 2.13 KiB
chunk (runtime: pageA, pageB) 52.js 88 bytes [rendered]
  > ./shared ./pageA.js 2:0-4:2
  > ./pageB.js 2:0-5:2
  ./shared.js 88 bytes [built] [code generated]
    [used exports unknown]
    from origin ./pageB.js
      require.ensure item ./shared ./pageB.js 2:0-5:2
      cjs require ./shared ./pageB.js 3:14-33
    amd require ./shared ./pageA.js 2:0-4:2
    cjs self exports reference ./shared.js 2:0-14
chunk (runtime: pageB) pageB.js (pageB) 148 bytes (javascript) 5.92 KiB (runtime) [entry] [rendered]
  > ./pageB pageB
  runtime modules 5.92 KiB 7 modules
  ./pageB.js 148 bytes [built] [code generated]
    [no exports used]
    entry ./pageB pageB
chunk (runtime: pageA, pageB) commons.js (commons) (id hint: commons) 26 bytes [initial] [rendered] split chunk (cache group: commons) (name: commons)
  > ./pageA pageA
  > ./pageB pageB
  ./common.js 26 bytes [built] [code generated]
    [used exports unknown]
    cjs self exports reference ./common.js 1:0-14
    cjs require ./common ./pageA.js 1:13-32
    cjs require ./common ./pageB.js 1:13-32
    cjs require ./common ./shared.js 1:13-32
chunk (runtime: pageA) pageA.js (pageA) 105 bytes (javascript) 5.92 KiB (runtime) [entry] [rendered]
  > ./pageA pageA
  runtime modules 5.92 KiB 7 modules
  ./pageA.js 105 bytes [built] [code generated]
    [no exports used]
    entry ./pageA pageA
webpack 5.51.1 compiled successfully