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# example.js
This example illustrates how to leverage the `import()` syntax to create ContextModules which are separated into separate chunks for each module in the `./templates` folder.
``` javascript
async function getTemplate(templateName) {
try {
let template = await import(`./templates/${templateName}`);
console.log(template);
} catch(err) {
console.error("template error");
return new Error(err);
}
}
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getTemplate("foo");
getTemplate("bar");
getTemplate("baz");
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```
# templates/
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* foo.js
* baz.js
* bar.js
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All templates are of this pattern:
``` javascript
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var foo = "foo";
export default foo;
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```
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# dist/output.js
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< details > < summary > < code > /******/ (function(modules) { /* webpackBootstrap */ })< / code > < / summary >
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``` javascript
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/******/ (function(modules, runtime) { // webpackBootstrap
/******/ "use strict";
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/******/ // The module cache
/******/ var installedModules = {};
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/******/
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/******/ // The require function
/******/ function __webpack_require__ (moduleId) {
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/******/
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/******/ // Check if module is in cache
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/******/ if(installedModules[moduleId]) {
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/******/ return installedModules[moduleId].exports;
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/******/ }
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/******/ // Create a new module (and put it into the cache)
/******/ var module = installedModules[moduleId] = {
/******/ i: moduleId,
/******/ l: false,
/******/ exports: {}
/******/ };
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/******/
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/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__ );
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/******/
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/******/ // Flag the module as loaded
/******/ module.l = true;
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/******/
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/******/ // Return the exports of the module
/******/ return module.exports;
/******/ }
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/******/
/******/
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/******/ // expose the modules object (__webpack_modules__)
/******/ __webpack_require__ .m = modules;
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/******/
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/******/ // initialize runtime
/******/ runtime(__webpack_require__);
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/******/
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/******/ // Load entry module and return exports
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/******/ return __webpack_require__ (0);
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/******/ })
/************************************************************************/
```
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< / details >
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``` javascript
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/******/ ([
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/* 0 */
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/*!********************!*\
!*** ./example.js ** *!
\********************/
/*! no static exports found */
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/*! runtime requirements: __webpack_require__ */
/***/ (function(__unusedmodule, __unusedexports, __webpack_require__ ) {
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async function getTemplate(templateName) {
try {
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let template = await __webpack_require__ (1)(`./${templateName}`);
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console.log(template);
} catch(err) {
console.error("template error");
return new Error(err);
}
}
getTemplate("foo");
getTemplate("bar");
getTemplate("baz");
/***/ }),
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/* 1 */
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/*!**************************************************!*\
!*** ./templates lazy ^\.\/.*$ namespace object ** *!
\**************************************************/
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/*! no static exports found */
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/*! runtime requirements: module, __webpack_require__ , __webpack_require__ .e */
/***/ (function(module, __unusedexports, __webpack_require__ ) {
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var map = {
"./bar": [
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2,
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920
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],
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"./bar.js": [
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2,
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920
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],
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"./baz": [
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3,
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374
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],
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"./baz.js": [
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3,
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374
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],
"./foo": [
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4,
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457
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],
"./foo.js": [
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4,
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457
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]
};
function webpackAsyncContext(req) {
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var ids = map[req];
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if(!ids) {
return Promise.resolve().then(function() {
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var e = new Error("Cannot find module '" + req + "'");
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e.code = 'MODULE_NOT_FOUND';
throw e;
});
}
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return __webpack_require__ .e(ids[1]).then(function() {
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var id = ids[0];
return __webpack_require__ (id);
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});
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}
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webpackAsyncContext.keys = function webpackAsyncContextKeys() {
return Object.keys(map);
};
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webpackAsyncContext.id = 1;
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module.exports = webpackAsyncContext;
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/***/ })
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/******/ ],
```
< details > < summary > < code > function(__webpack_require__) { /* webpackRuntimeModules */ });< / code > < / summary >
``` js
/******/ function(__webpack_require__) { // webpackRuntimeModules
/******/ "use strict";
/******/
/******/ /* webpack/runtime/ensure chunk */
/******/ !function() {
/******/ __webpack_require__ .f = {};
/******/ // This file contains only the entry chunk.
/******/ // The chunk loading function for additional chunks
/******/ __webpack_require__ .e = function requireEnsure(chunkId) {
/******/ return Promise.all(Object.keys(__webpack_require__.f).reduce(function(promises, key) { __webpack_require__ .f[key](chunkId, promises); return promises; }, []));
/******/ };
/******/ }();
/******/
/******/ /* webpack/runtime/make namespace object */
/******/ !function() {
/******/ // 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 });
/******/ };
/******/ }();
/******/
/******/ /* webpack/runtime/publicPath */
/******/ !function() {
/******/ __webpack_require__ .p = "dist/";
/******/ }();
/******/
/******/ /* webpack/runtime/get javascript chunk filename */
/******/ !function() {
/******/ __webpack_require__ .u = function(chunkId) {
/******/ return "" + chunkId + ".output.js";
/******/ };
/******/ }();
/******/
/******/ /* webpack/runtime/jsonp chunk loading */
/******/ !function() {
/******/
/******/
/******/ // object to store loaded and loading chunks
/******/ // undefined = chunk not loaded, null = chunk preloaded/prefetched
/******/ // Promise = chunk loading, 0 = chunk loaded
/******/ var installedChunks = {
/******/ 404: 0
/******/ };
/******/
/******/
/******/
/******/ __webpack_require__ .f.j = function(chunkId, 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 url = __webpack_require__ .p + __webpack_require__ .u(chunkId);
/******/ var loadingEnded = function() { if(installedChunks[chunkId]) return installedChunks[chunkId][1]; if(installedChunks[chunkId] !== 0) installedChunks[chunkId] = undefined; };
/******/ 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 = url;
/******/
/******/ onScriptComplete = function (event) {
/******/ // avoid mem leaks in IE.
/******/ script.onerror = script.onload = null;
/******/ clearTimeout(timeout);
/******/ var reportError = loadingEnded();
/******/ if(reportError) {
/******/ 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;
/******/ reportError(error);
/******/ }
/******/ };
/******/ var timeout = setTimeout(function(){
/******/ onScriptComplete({ type: 'timeout', target: script });
/******/ }, 120000);
/******/ script.onerror = script.onload = onScriptComplete;
/******/ document.head.appendChild(script);
/******/
/******/ // no HMR
/******/ }
/******/ }
/******/
/******/ // no chunk preloading needed
/******/ };
/******/
/******/ // no prefetching
/******/
/******/ // no HMR
/******/
/******/ // no HMR manifest
/******/
/******/ // no deferred startup
/******/
/******/ // install a JSONP callback for chunk loading
/******/ function webpackJsonpCallback(data) {
/******/ var chunkIds = data[0];
/******/ var moreModules = data[1];
/******/
/******/ var runtime = data[3];
/******/
/******/ // 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)) {
/******/ __webpack_require__ .m[moduleId] = moreModules[moduleId];
/******/ }
/******/ }
/******/ if(runtime) runtime(__webpack_require__);
/******/ if(parentJsonpFunction) parentJsonpFunction(data);
/******/
/******/ while(resolves.length) {
/******/ resolves.shift()();
/******/ }
/******/
/******/ };
/******/
/******/ var jsonpArray = window["webpackJsonp"] = window["webpackJsonp"] || [];
/******/ var oldJsonpFunction = jsonpArray.push.bind(jsonpArray);
/******/ jsonpArray.push = webpackJsonpCallback;
/******/
/******/ var parentJsonpFunction = oldJsonpFunction;
/******/ }();
/******/
/******/ }
);
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```
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< / details >
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# Info
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## Unoptimized
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```
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Hash: 0a1b2c3d4e5f6a7b8c9d
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Version: webpack 5.0.0-next
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Asset Size Chunks Chunk Names
374.output.js 539 bytes {374} [emitted]
457.output.js 539 bytes {457} [emitted]
920.output.js 539 bytes {920} [emitted]
output.js 8.66 KiB {404} [emitted] main
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Entrypoint main = output.js
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chunk {374} 374.output.js 38 bytes < {404}> [rendered]
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> ./baz [1] ./templates lazy ^\.\/.*$ namespace object ./baz
> ./baz.js [1] ./templates lazy ^\.\/.*$ namespace object ./baz.js
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[3] ./templates/baz.js 38 bytes {374} [optional] [built]
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[exports: default]
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[used exports unknown]
context element ./baz [1] ./templates lazy ^\.\/.*$ namespace object ./baz
context element ./baz.js [1] ./templates lazy ^\.\/.*$ namespace object ./baz.js
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chunk {404} output.js (main) 441 bytes (javascript) 3.82 KiB (runtime) >{374}< >{457}< >{920}< [entry] [rendered]
> .\example.js main
[0] ./example.js 281 bytes {404} [built]
[used exports unknown]
entry .\example.js main
[1] ./templates lazy ^\.\/.*$ namespace object 160 bytes {404} [optional] [built]
[used exports unknown]
import() context lazy ./templates [0] ./example.js 3:23-60
+ 5 hidden chunk modules
chunk {457} 457.output.js 38 bytes < {404}> [rendered]
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> ./foo [1] ./templates lazy ^\.\/.*$ namespace object ./foo
> ./foo.js [1] ./templates lazy ^\.\/.*$ namespace object ./foo.js
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[4] ./templates/foo.js 38 bytes {457} [optional] [built]
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[exports: default]
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[used exports unknown]
context element ./foo [1] ./templates lazy ^\.\/.*$ namespace object ./foo
context element ./foo.js [1] ./templates lazy ^\.\/.*$ namespace object ./foo.js
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chunk {920} 920.output.js 38 bytes < {404}> [rendered]
> ./bar [1] ./templates lazy ^\.\/.*$ namespace object ./bar
> ./bar.js [1] ./templates lazy ^\.\/.*$ namespace object ./bar.js
[2] ./templates/bar.js 38 bytes {920} [optional] [built]
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[exports: default]
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[used exports unknown]
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context element ./bar [1] ./templates lazy ^\.\/.*$ namespace object ./bar
context element ./bar.js [1] ./templates lazy ^\.\/.*$ namespace object ./bar.js
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```
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## Production mode
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```
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Hash: 0a1b2c3d4e5f6a7b8c9d
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Version: webpack 5.0.0-next
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Asset Size Chunks Chunk Names
374.output.js 119 bytes {374} [emitted]
457.output.js 119 bytes {457} [emitted]
920.output.js 119 bytes {920} [emitted]
output.js 2.06 KiB {404} [emitted] main
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Entrypoint main = output.js
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chunk {374} 374.output.js 38 bytes < {404}> [rendered]
> ./baz [305] ./templates lazy ^\.\/.*$ namespace object ./baz
> ./baz.js [305] ./templates lazy ^\.\/.*$ namespace object ./baz.js
[374] ./templates/baz.js 38 bytes {374} [optional] [built]
[exports: default]
context element ./baz [305] ./templates lazy ^\.\/.*$ namespace object ./baz
context element ./baz.js [305] ./templates lazy ^\.\/.*$ namespace object ./baz.js
chunk {404} output.js (main) 441 bytes (javascript) 3.82 KiB (runtime) >{374}< >{457}< >{920}< [entry] [rendered]
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> .\example.js main
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[275] ./example.js 281 bytes {404} [built]
entry .\example.js main
[305] ./templates lazy ^\.\/.*$ namespace object 160 bytes {404} [optional] [built]
import() context lazy ./templates [275] ./example.js 3:23-60
+ 5 hidden chunk modules
chunk {457} 457.output.js 38 bytes < {404}> [rendered]
> ./foo [305] ./templates lazy ^\.\/.*$ namespace object ./foo
> ./foo.js [305] ./templates lazy ^\.\/.*$ namespace object ./foo.js
[457] ./templates/foo.js 38 bytes {457} [optional] [built]
[exports: default]
context element ./foo [305] ./templates lazy ^\.\/.*$ namespace object ./foo
context element ./foo.js [305] ./templates lazy ^\.\/.*$ namespace object ./foo.js
chunk {920} 920.output.js 38 bytes < {404}> [rendered]
> ./bar [305] ./templates lazy ^\.\/.*$ namespace object ./bar
> ./bar.js [305] ./templates lazy ^\.\/.*$ namespace object ./bar.js
[920] ./templates/bar.js 38 bytes {920} [optional] [built]
[exports: default]
context element ./bar [305] ./templates lazy ^\.\/.*$ namespace object ./bar
context element ./bar.js [305] ./templates lazy ^\.\/.*$ namespace object ./bar.js
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```
