webpack/examples/code-splitting-native-impor.../README.md

16 KiB

example.js

This example illustrates how to filter the ContextModule results of import() statements. Only .js files that don't end in .noimport.js within the templates folder will be bundled.

async function getTemplate(templateName) {
	try {
		let template = await import(
			/* webpackInclude: /\.js$/ */
			/* webpackExclude: /\.noimport\.js$/ */
			`./templates/${templateName}`
		);
		console.log(template);
	} catch(err) {
		console.error(err);
		return new Error(err);
	}
}

getTemplate("foo");
getTemplate("bar");
getTemplate("baz");
getTemplate("foo.noimport");
getTemplate("bar.noimport");
getTemplate("baz.noimport");

templates/

  • foo.js
  • foo.noimport.js
  • baz.js
  • foo.noimport.js
  • bar.js
  • foo.noimport.js

All templates are of this pattern:

var foo = "foo";

export default foo;

dist/output.js

/******/ (() => { // webpackBootstrap
/******/ 	var __webpack_modules__ = ([
/* 0 */,
/* 1 */
/*!*******************************************************************************************!*\
  !*** ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ***!
  \*******************************************************************************************/
/*! default exports */
/*! exports [not provided] [no usage info] */
/*! runtime requirements: module, __webpack_require__.o, __webpack_require__, __webpack_require__.e, __webpack_require__.* */
/***/ ((module, __unused_webpack_exports, __webpack_require__) => {

var map = {
	"./bar": [
		2,
		398
	],
	"./bar.js": [
		2,
		398
	],
	"./baz": [
		3,
		544
	],
	"./baz.js": [
		3,
		544
	],
	"./foo": [
		4,
		718
	],
	"./foo.js": [
		4,
		718
	]
};
function webpackAsyncContext(req) {
	if(!__webpack_require__.o(map, req)) {
		return Promise.resolve().then(() => {
			var e = new Error("Cannot find module '" + req + "'");
			e.code = 'MODULE_NOT_FOUND';
			throw e;
		});
	}

	var ids = map[req], id = ids[0];
	return __webpack_require__.e(ids[1]).then(() => {
		return __webpack_require__(id);
	});
}
webpackAsyncContext.keys = () => Object.keys(map);
webpackAsyncContext.id = 1;
module.exports = webpackAsyncContext;

/***/ })
/******/ 	]);
/* webpack runtime code */
/************************************************************************/
/******/ 	// The module cache
/******/ 	var __webpack_module_cache__ = {};
/******/ 	
/******/ 	// The require function
/******/ 	function __webpack_require__(moduleId) {
/******/ 		// Check if module is in cache
/******/ 		if(__webpack_module_cache__[moduleId]) {
/******/ 			return __webpack_module_cache__[moduleId].exports;
/******/ 		}
/******/ 		// Create a new module (and put it into the cache)
/******/ 		var module = __webpack_module_cache__[moduleId] = {
/******/ 			// no module.id needed
/******/ 			// no module.loaded needed
/******/ 			exports: {}
/******/ 		};
/******/ 	
/******/ 		// Execute the module function
/******/ 		__webpack_modules__[moduleId](module, module.exports, __webpack_require__);
/******/ 	
/******/ 		// Return the exports of the module
/******/ 		return module.exports;
/******/ 	}
/******/ 	
/******/ 	// expose the modules object (__webpack_modules__)
/******/ 	__webpack_require__.m = __webpack_modules__;
/******/ 	
/************************************************************************/
/******/ 	/* webpack/runtime/define property getters */
/******/ 	(() => {
/******/ 		// define getter functions for harmony exports
/******/ 		__webpack_require__.d = (exports, definition) => {
/******/ 			for(var key in definition) {
/******/ 				if(__webpack_require__.o(definition, key) && !__webpack_require__.o(exports, key)) {
/******/ 					Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });
/******/ 				}
/******/ 			}
/******/ 		};
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/ensure chunk */
/******/ 	(() => {
/******/ 		__webpack_require__.f = {};
/******/ 		// This file contains only the entry chunk.
/******/ 		// The chunk loading function for additional chunks
/******/ 		__webpack_require__.e = (chunkId) => {
/******/ 			return Promise.all(Object.keys(__webpack_require__.f).reduce((promises, key) => {
/******/ 				__webpack_require__.f[key](chunkId, promises);
/******/ 				return promises;
/******/ 			}, []));
/******/ 		};
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/get javascript chunk filename */
/******/ 	(() => {
/******/ 		// This function allow to reference async chunks
/******/ 		__webpack_require__.u = (chunkId) => {
/******/ 			// return url for filenames based on template
/******/ 			return "" + chunkId + ".output.js";
/******/ 		};
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/hasOwnProperty shorthand */
/******/ 	(() => {
/******/ 		__webpack_require__.o = (obj, prop) => Object.prototype.hasOwnProperty.call(obj, prop)
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/load script */
/******/ 	(() => {
/******/ 		var inProgress = {};
/******/ 		// data-webpack is not used as build has no uniqueName
/******/ 		// loadScript function to load a script via script tag
/******/ 		__webpack_require__.l = (url, done, key) => {
/******/ 			if(inProgress[url]) { inProgress[url].push(done); return; }
/******/ 			var script, needAttach;
/******/ 			if(key !== undefined) {
/******/ 				var scripts = document.getElementsByTagName("script");
/******/ 				for(var i = 0; i < scripts.length; i++) {
/******/ 					var s = scripts[i];
/******/ 					if(s.getAttribute("src") == url) { script = s; break; }
/******/ 				}
/******/ 			}
/******/ 			if(!script) {
/******/ 				needAttach = true;
/******/ 				script = document.createElement('script');
/******/ 		
/******/ 				script.charset = 'utf-8';
/******/ 				script.timeout = 120;
/******/ 				if (__webpack_require__.nc) {
/******/ 					script.setAttribute("nonce", __webpack_require__.nc);
/******/ 				}
/******/ 		
/******/ 				script.src = url;
/******/ 			}
/******/ 			inProgress[url] = [done];
/******/ 			var onScriptComplete = (prev, event) => {
/******/ 				// avoid mem leaks in IE.
/******/ 				script.onerror = script.onload = null;
/******/ 				clearTimeout(timeout);
/******/ 				var doneFns = inProgress[url];
/******/ 				delete inProgress[url];
/******/ 				script.parentNode && script.parentNode.removeChild(script);
/******/ 				doneFns && doneFns.forEach((fn) => fn(event));
/******/ 				if(prev) return prev(event);
/******/ 			}
/******/ 			;
/******/ 			var timeout = setTimeout(onScriptComplete.bind(null, undefined, { type: 'timeout', target: script }), 120000);
/******/ 			script.onerror = onScriptComplete.bind(null, script.onerror);
/******/ 			script.onload = onScriptComplete.bind(null, script.onload);
/******/ 			needAttach && document.head.appendChild(script);
/******/ 		};
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/make namespace object */
/******/ 	(() => {
/******/ 		// define __esModule on exports
/******/ 		__webpack_require__.r = (exports) => {
/******/ 			if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
/******/ 				Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
/******/ 			}
/******/ 			Object.defineProperty(exports, '__esModule', { value: true });
/******/ 		};
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/publicPath */
/******/ 	(() => {
/******/ 		__webpack_require__.p = "dist/";
/******/ 	})();
/******/ 	
/******/ 	/* webpack/runtime/jsonp chunk loading */
/******/ 	(() => {
/******/ 		// no baseURI
/******/ 		
/******/ 		// object to store loaded and loading chunks
/******/ 		// undefined = chunk not loaded, null = chunk preloaded/prefetched
/******/ 		// Promise = chunk loading, 0 = chunk loaded
/******/ 		var installedChunks = {
/******/ 			179: 0
/******/ 		};
/******/ 		
/******/ 		
/******/ 		__webpack_require__.f.j = (chunkId, promises) => {
/******/ 				// JSONP chunk loading for javascript
/******/ 				var installedChunkData = __webpack_require__.o(installedChunks, chunkId) ? installedChunks[chunkId] : undefined;
/******/ 				if(installedChunkData !== 0) { // 0 means "already installed".
/******/ 		
/******/ 					// a Promise means "currently loading".
/******/ 					if(installedChunkData) {
/******/ 						promises.push(installedChunkData[2]);
/******/ 					} else {
/******/ 						if(true) { // all chunks have JS
/******/ 							// setup Promise in chunk cache
/******/ 							var promise = new Promise((resolve, reject) => {
/******/ 								installedChunkData = installedChunks[chunkId] = [resolve, reject];
/******/ 							});
/******/ 							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);
/******/ 						} else installedChunks[chunkId] = 0;
/******/ 					}
/******/ 				}
/******/ 		};
/******/ 		
/******/ 		// no prefetching
/******/ 		
/******/ 		// no preloaded
/******/ 		
/******/ 		// no HMR
/******/ 		
/******/ 		// no HMR manifest
/******/ 		
/******/ 		// no deferred startup
/******/ 		
/******/ 		// install a JSONP callback for chunk loading
/******/ 		var webpackJsonpCallback = (data) => {
/******/ 			var [chunkIds, moreModules, runtime] = data;
/******/ 			// 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(__webpack_require__.o(installedChunks, chunkId) && installedChunks[chunkId]) {
/******/ 					resolves.push(installedChunks[chunkId][0]);
/******/ 				}
/******/ 				installedChunks[chunkId] = 0;
/******/ 			}
/******/ 			for(moduleId in moreModules) {
/******/ 				if(__webpack_require__.o(moreModules, moduleId)) {
/******/ 					__webpack_require__.m[moduleId] = moreModules[moduleId];
/******/ 				}
/******/ 			}
/******/ 			if(runtime) runtime(__webpack_require__);
/******/ 			parentChunkLoadingFunction(data);
/******/ 			while(resolves.length) {
/******/ 				resolves.shift()();
/******/ 			}
/******/ 		
/******/ 		}
/******/ 		
/******/ 		var chunkLoadingGlobal = self["webpackChunk"] = self["webpackChunk"] || [];
/******/ 		var parentChunkLoadingFunction = chunkLoadingGlobal.push.bind(chunkLoadingGlobal);
/******/ 		chunkLoadingGlobal.push = webpackJsonpCallback;
/******/ 	})();
/******/ 	
/************************************************************************/
(() => {
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/*! unknown exports (runtime-defined) */
/*! runtime requirements: __webpack_require__ */
async function getTemplate(templateName) {
	try {
		let template = await __webpack_require__(1)(`./${templateName}`);
		console.log(template);
	} catch(err) {
		console.error(err);
		return new Error(err);
	}
}

getTemplate("foo");
getTemplate("bar");
getTemplate("baz");
getTemplate("foo.noimport");
getTemplate("bar.noimport");
getTemplate("baz.noimport");


})();

/******/ })()
;

Info

Unoptimized

asset output.js 10.9 KiB [emitted] (name: main)
asset 398.output.js 856 bytes [emitted]
asset 544.output.js 856 bytes [emitted]
asset 718.output.js 856 bytes [emitted]
chunk output.js (main) 597 bytes (javascript) 5.42 KiB (runtime) [entry] [rendered]
  > ./example.js main
  runtime modules 5.42 KiB 8 modules
  dependent modules 160 bytes [dependent] 1 module
  ./example.js 437 bytes [built] [code generated]
    [used exports unknown]
    entry ./example.js main
chunk 398.output.js 38 bytes [rendered]
  > ./bar ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./bar
  > ./bar.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./bar.js
  ./templates/bar.js 38 bytes [optional] [built] [code generated]
    [exports: default]
    [used exports unknown]
    context element ./bar ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./bar
    context element ./bar.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./bar.js
chunk 544.output.js 38 bytes [rendered]
  > ./baz ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./baz
  > ./baz.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./baz.js
  ./templates/baz.js 38 bytes [optional] [built] [code generated]
    [exports: default]
    [used exports unknown]
    context element ./baz ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./baz
    context element ./baz.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./baz.js
chunk 718.output.js 38 bytes [rendered]
  > ./foo ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./foo
  > ./foo.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./foo.js
  ./templates/foo.js 38 bytes [optional] [built] [code generated]
    [exports: default]
    [used exports unknown]
    context element ./foo ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./foo
    context element ./foo.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./foo.js
webpack 5.0.0-beta.32 compiled successfully

Production mode

asset output.js 2.41 KiB [emitted] [minimized] (name: main)
asset 398.output.js 130 bytes [emitted] [minimized]
asset 544.output.js 130 bytes [emitted] [minimized]
asset 718.output.js 130 bytes [emitted] [minimized]
chunk (runtime: main) output.js (main) 597 bytes (javascript) 5.42 KiB (runtime) [entry] [rendered]
  > ./example.js main
  runtime modules 5.42 KiB 8 modules
  dependent modules 160 bytes [dependent] 1 module
  ./example.js 437 bytes [built] [code generated]
    [no exports used]
    entry ./example.js main
chunk (runtime: main) 398.output.js 38 bytes [rendered]
  > ./bar ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./bar
  > ./bar.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./bar.js
  ./templates/bar.js 38 bytes [optional] [built] [code generated]
    [exports: default]
    context element ./bar ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./bar
    context element ./bar.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./bar.js
chunk (runtime: main) 544.output.js 38 bytes [rendered]
  > ./baz ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./baz
  > ./baz.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./baz.js
  ./templates/baz.js 38 bytes [optional] [built] [code generated]
    [exports: default]
    context element ./baz ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./baz
    context element ./baz.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./baz.js
chunk (runtime: main) 718.output.js 38 bytes [rendered]
  > ./foo ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./foo
  > ./foo.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./foo.js
  ./templates/foo.js 38 bytes [optional] [built] [code generated]
    [exports: default]
    context element ./foo ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./foo
    context element ./foo.js ./templates/ lazy ^\.\/.*$ include: \.js$ exclude: \.noimport\.js$ namespace object ./foo.js
webpack 5.0.0-beta.32 compiled successfully