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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.

async function getTemplate(templateName) {
	try {
		let template = await import(`./templates/${templateName}`);
		console.log(template);
	} catch(err) {
		console.error("template error");
		return new Error(err);
	}
}

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

templates/

foo.js
baz.js
bar.js

All templates are of this pattern:

var foo = "foo";

export default foo;

js/output.js

`/******/ (function(modules) { /* webpackBootstrap */ })`

``` javascript /******/ (function(modules) { // webpackBootstrap /******/ // install a JSONP callback for chunk loading /******/ var parentJsonpFunction = window["webpackJsonp"]; /******/ window["webpackJsonp"] = function webpackJsonpCallback(chunkIds, moreModules, executeModules) { /******/ // add "moreModules" to the modules object, /******/ // then flag all "chunkIds" as loaded and fire callback /******/ var moduleId, chunkId, i = 0, resolves = [], result; /******/ 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(chunkIds, moreModules, executeModules); /******/ while(resolves.length) /******/ resolves.shift()();

/******/ };

// // The module cache // var installedModules = {};

// // objects to store loaded and loading chunks // var installedChunks = { // 3: 0 // };

// // 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) { // if(installedChunks[chunkId] === 0) /******/ return Promise.resolve();

// // a Promise means "currently loading". // if(installedChunks[chunkId]) { // return installedChunks[chunkId][2]; // } // // start chunk loading // var head = document.getElementsByTagName('head')[0]; // var script = document.createElement('script'); // script.type = 'text/javascript'; // script.charset = 'utf-8'; // script.async = true; /******/ script.timeout = 120000;

// if (webpack_require.nc) { // script.setAttribute("nonce", webpack_require.nc); // } // script.src = webpack_require.p + "" + chunkId + ".output.js"; // var timeout = setTimeout(onScriptComplete, 120000); // script.onerror = script.onload = onScriptComplete; // function onScriptComplete() { // // avoid mem leaks in IE. // script.onerror = script.onload = null; // clearTimeout(timeout); // var chunk = installedChunks[chunkId]; // if(chunk !== 0) { // if(chunk) chunk[1](new Error('Loading chunk ' + chunkId + ' failed.')); // installedChunks[chunkId] = undefined; // } // };

// var promise = new Promise(function(resolve, reject) { // installedChunks[chunkId] = [resolve, reject]; // }); // installedChunks[chunkId][2] = promise;

// head.appendChild(script); // return promise; /******/ };

// // expose the modules object (webpack_modules) // webpack_require.m = modules;

// // expose the module cache // webpack_require.c = installedModules;

// // identity function for calling harmony imports with the correct context // webpack_require.i = function(value) { return value; };

// // define getter function for harmony exports // webpack_require.d = function(exports, name, getter) { // if(!webpack_require.o(exports, name)) { // Object.defineProperty(exports, name, { // configurable: false, // enumerable: true, // get: getter // }); // } // };

// // 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 = "js/";

// // on error function for async loading // webpack_require.oe = function(err) { console.error(err); throw err; };

// // Load entry module and return exports // return webpack_require(webpack_require.s = 4); // }) /******************************************************************/

</details>
``` javascript
/******/ ([
/* 0 */
/* unknown exports provided */
/* all exports used */
/*!**********************************!*\
  !*** ./templates async ^\.\/.*$ ***!
  \**********************************/
/***/ (function(module, exports, __webpack_require__) {

var map = {
	"./bar": [
		1,
		2
	],
	"./bar.js": [
		1,
		2
	],
	"./baz": [
		2,
		1
	],
	"./baz.js": [
		2,
		1
	],
	"./foo": [
		3,
		0
	],
	"./foo.js": [
		3,
		0
	]
};
function webpackAsyncContext(req) {
	var ids = map[req];	if(!ids)
		return Promise.reject(new Error("Cannot find module '" + req + "'."));
	return __webpack_require__.e(ids[1]).then(function() {
		return __webpack_require__(ids[0]);
	});
};
webpackAsyncContext.keys = function webpackAsyncContextKeys() {
	return Object.keys(map);
};
module.exports = webpackAsyncContext;
webpackAsyncContext.id = 0;


/***/ }),
/* 1 */,
/* 2 */,
/* 3 */,
/* 4 */
/* unknown exports provided */
/* all exports used */
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/***/ (function(module, exports, __webpack_require__) {

async function getTemplate(templateName) {
	try {
		let template = await __webpack_require__(/*! ./templates */ 0)(`./${templateName}`);
		console.log(template);
	} catch(err) {
		console.error("template error");
		return new Error(err);
	}
}

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




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

Info

Uncompressed

Hash: 6ff942ea6efa4b698d2f
Version: webpack 2.2.1
      Asset       Size  Chunks             Chunk Names
0.output.js  439 bytes       0  [emitted]  
1.output.js  439 bytes       1  [emitted]  
2.output.js  445 bytes       2  [emitted]  
  output.js    6.82 kB       3  [emitted]  main
Entrypoint main = output.js
chunk    {0} 0.output.js 38 bytes {3} [rendered]
    [3] ./templates/foo.js 38 bytes {0} [optional] [built]
        [exports: default]
        context element ./foo [0] ./templates async ^\.\/.*$ ./foo
        context element ./foo.js [0] ./templates async ^\.\/.*$ ./foo.js
chunk    {1} 1.output.js 38 bytes {3} [rendered]
    [2] ./templates/baz.js 38 bytes {1} [optional] [built]
        [exports: default]
        context element ./baz [0] ./templates async ^\.\/.*$ ./baz
        context element ./baz.js [0] ./templates async ^\.\/.*$ ./baz.js
chunk    {2} 2.output.js 38 bytes {3} [rendered]
    [1] ./templates/bar.js 38 bytes {2} [optional] [built]
        [exports: default]
        context element ./bar [0] ./templates async ^\.\/.*$ ./bar
        context element ./bar.js [0] ./templates async ^\.\/.*$ ./bar.js
chunk    {3} output.js (main) 441 bytes [entry] [rendered]
    > main [4] ./example.js 
    [0] ./templates async ^\.\/.*$ 160 bytes {3} [optional] [built]
        import() context ./templates [4] ./example.js 3:23-60
    [4] ./example.js 281 bytes {3} [built]

Minimized (uglify-js, no zip)

Hash: 6ff942ea6efa4b698d2f
Version: webpack 2.2.1
      Asset       Size  Chunks             Chunk Names
0.output.js  125 bytes       0  [emitted]  
1.output.js  125 bytes       1  [emitted]  
2.output.js  124 bytes       2  [emitted]  
  output.js     6.5 kB       3  [emitted]  main
Entrypoint main = output.js
chunk    {0} 0.output.js 38 bytes {3} [rendered]
    [3] ./templates/foo.js 38 bytes {0} [optional] [built]
        [exports: default]
        context element ./foo [0] ./templates async ^\.\/.*$ ./foo
        context element ./foo.js [0] ./templates async ^\.\/.*$ ./foo.js
chunk    {1} 1.output.js 38 bytes {3} [rendered]
    [2] ./templates/baz.js 38 bytes {1} [optional] [built]
        [exports: default]
        context element ./baz [0] ./templates async ^\.\/.*$ ./baz
        context element ./baz.js [0] ./templates async ^\.\/.*$ ./baz.js
chunk    {2} 2.output.js 38 bytes {3} [rendered]
    [1] ./templates/bar.js 38 bytes {2} [optional] [built]
        [exports: default]
        context element ./bar [0] ./templates async ^\.\/.*$ ./bar
        context element ./bar.js [0] ./templates async ^\.\/.*$ ./bar.js
chunk    {3} output.js (main) 441 bytes [entry] [rendered]
    > main [4] ./example.js 
    [0] ./templates async ^\.\/.*$ 160 bytes {3} [optional] [built]
        import() context ./templates [4] ./example.js 3:23-60
    [4] ./example.js 281 bytes {3} [built]

ERROR in output.js from UglifyJs
SyntaxError: Unexpected token: keyword (function) [output.js:194,6]

10 KiB Raw Blame History