mirror of https://github.com/webpack/webpack.git
440 lines
15 KiB
Markdown
440 lines
15 KiB
Markdown
# example.js
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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.
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```javascript
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async function getTemplate(templateName) {
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try {
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let template = await import(`./templates/${templateName}`);
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console.log(template);
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} catch(err) {
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console.error("template error");
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return new Error(err);
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}
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}
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getTemplate("foo");
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getTemplate("bar");
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getTemplate("baz");
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```
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# templates/
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- foo.js
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- baz.js
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- bar.js
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All templates are of this pattern:
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```javascript
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var foo = "foo";
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export default foo;
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```
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# dist/output.js
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```javascript
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/******/ (() => { // webpackBootstrap
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/******/ var __webpack_modules__ = ([
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/* 0 */,
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/* 1 */
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/*!***************************************************!*\
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!*** ./templates/ lazy ^\.\/.*$ namespace object ***!
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\***************************************************/
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/*! default exports */
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/*! exports [not provided] [no usage info] */
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/*! runtime requirements: module, __webpack_require__.o, __webpack_require__, __webpack_require__.e, __webpack_require__.* */
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/***/ ((module, __unused_webpack_exports, __webpack_require__) => {
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var map = {
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"./bar": [
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2,
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398
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],
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"./bar.js": [
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2,
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398
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],
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"./baz": [
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3,
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544
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],
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"./baz.js": [
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3,
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544
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],
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"./foo": [
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4,
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718
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],
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"./foo.js": [
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4,
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718
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]
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};
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function webpackAsyncContext(req) {
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if(!__webpack_require__.o(map, req)) {
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return Promise.resolve().then(() => {
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var e = new Error("Cannot find module '" + req + "'");
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e.code = 'MODULE_NOT_FOUND';
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throw e;
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});
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}
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var ids = map[req], id = ids[0];
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return __webpack_require__.e(ids[1]).then(() => {
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return __webpack_require__(id);
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});
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}
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webpackAsyncContext.keys = () => 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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/******/ ]);
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```
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<details><summary><code>/* webpack runtime code */</code></summary>
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``` js
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/************************************************************************/
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/******/ // The module cache
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/******/ var __webpack_module_cache__ = {};
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/******/
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/******/ // The require function
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/******/ function __webpack_require__(moduleId) {
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/******/ // Check if module is in cache
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/******/ if(__webpack_module_cache__[moduleId]) {
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/******/ return __webpack_module_cache__[moduleId].exports;
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/******/ }
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/******/ // Create a new module (and put it into the cache)
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/******/ var module = __webpack_module_cache__[moduleId] = {
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/******/ // no module.id needed
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/******/ // no module.loaded needed
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/******/ exports: {}
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/******/ };
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/******/
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/******/ // Execute the module function
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/******/ __webpack_modules__[moduleId](module, module.exports, __webpack_require__);
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/******/
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/******/ // Return the exports of the module
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/******/ return module.exports;
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/******/ }
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/******/
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/******/ // expose the modules object (__webpack_modules__)
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/******/ __webpack_require__.m = __webpack_modules__;
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/******/
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/************************************************************************/
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/******/ /* webpack/runtime/define property getters */
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/******/ (() => {
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/******/ // define getter functions for harmony exports
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/******/ __webpack_require__.d = (exports, definition) => {
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/******/ for(var key in definition) {
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/******/ if(__webpack_require__.o(definition, key) && !__webpack_require__.o(exports, key)) {
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/******/ Object.defineProperty(exports, key, { enumerable: true, get: definition[key] });
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/******/ }
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/******/ }
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/******/ };
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/******/ })();
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/******/
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/******/ /* webpack/runtime/ensure chunk */
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/******/ (() => {
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/******/ __webpack_require__.f = {};
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/******/ // This file contains only the entry chunk.
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/******/ // The chunk loading function for additional chunks
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/******/ __webpack_require__.e = (chunkId) => {
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/******/ return Promise.all(Object.keys(__webpack_require__.f).reduce((promises, key) => {
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/******/ __webpack_require__.f[key](chunkId, promises);
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/******/ return promises;
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/******/ }, []));
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/******/ };
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/******/ })();
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/******/
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/******/ /* webpack/runtime/get javascript chunk filename */
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/******/ (() => {
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/******/ // This function allow to reference async chunks
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/******/ __webpack_require__.u = (chunkId) => {
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/******/ // return url for filenames based on template
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/******/ return "" + chunkId + ".output.js";
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/******/ };
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/******/ })();
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/******/
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/******/ /* webpack/runtime/hasOwnProperty shorthand */
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/******/ (() => {
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/******/ __webpack_require__.o = (obj, prop) => Object.prototype.hasOwnProperty.call(obj, prop)
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/******/ })();
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/******/
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/******/ /* webpack/runtime/load script */
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/******/ (() => {
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/******/ var inProgress = {};
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/******/ // data-webpack is not used as build has no uniqueName
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/******/ // loadScript function to load a script via script tag
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/******/ __webpack_require__.l = (url, done, key) => {
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/******/ if(inProgress[url]) { inProgress[url].push(done); return; }
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/******/ var script, needAttach;
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/******/ if(key !== undefined) {
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/******/ var scripts = document.getElementsByTagName("script");
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/******/ for(var i = 0; i < scripts.length; i++) {
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/******/ var s = scripts[i];
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/******/ if(s.getAttribute("src") == url) { script = s; break; }
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/******/ }
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/******/ }
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/******/ if(!script) {
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/******/ needAttach = true;
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/******/ script = document.createElement('script');
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/******/
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/******/ script.charset = 'utf-8';
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/******/ script.timeout = 120;
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/******/ if (__webpack_require__.nc) {
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/******/ script.setAttribute("nonce", __webpack_require__.nc);
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/******/ }
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/******/
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/******/ script.src = url;
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/******/ }
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/******/ inProgress[url] = [done];
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/******/ var onScriptComplete = (prev, event) => {
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/******/ // avoid mem leaks in IE.
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/******/ script.onerror = script.onload = null;
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/******/ clearTimeout(timeout);
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/******/ var doneFns = inProgress[url];
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/******/ delete inProgress[url];
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/******/ script.parentNode && script.parentNode.removeChild(script);
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/******/ doneFns && doneFns.forEach((fn) => fn(event));
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/******/ if(prev) return prev(event);
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/******/ }
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/******/ ;
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/******/ var timeout = setTimeout(onScriptComplete.bind(null, undefined, { type: 'timeout', target: script }), 120000);
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/******/ script.onerror = onScriptComplete.bind(null, script.onerror);
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/******/ script.onload = onScriptComplete.bind(null, script.onload);
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/******/ needAttach && document.head.appendChild(script);
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/******/ };
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/******/ })();
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/******/
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/******/ /* webpack/runtime/make namespace object */
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/******/ (() => {
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/******/ // define __esModule on exports
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/******/ __webpack_require__.r = (exports) => {
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/******/ if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
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/******/ Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
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/******/ }
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/******/ Object.defineProperty(exports, '__esModule', { value: true });
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/******/ };
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/******/ })();
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/******/
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/******/ /* webpack/runtime/publicPath */
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/******/ (() => {
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/******/ __webpack_require__.p = "dist/";
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/******/ })();
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/******/
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/******/ /* webpack/runtime/jsonp chunk loading */
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/******/ (() => {
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/******/ // no baseURI
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/******/
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/******/ // object to store loaded and loading chunks
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/******/ // undefined = chunk not loaded, null = chunk preloaded/prefetched
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/******/ // Promise = chunk loading, 0 = chunk loaded
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/******/ var installedChunks = {
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/******/ 179: 0
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/******/ };
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/******/
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/******/
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/******/ __webpack_require__.f.j = (chunkId, promises) => {
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/******/ // JSONP chunk loading for javascript
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/******/ var installedChunkData = __webpack_require__.o(installedChunks, chunkId) ? installedChunks[chunkId] : undefined;
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/******/ if(installedChunkData !== 0) { // 0 means "already installed".
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/******/
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/******/ // a Promise means "currently loading".
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/******/ if(installedChunkData) {
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/******/ promises.push(installedChunkData[2]);
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/******/ } else {
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/******/ if(true) { // all chunks have JS
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/******/ // setup Promise in chunk cache
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/******/ var promise = new Promise((resolve, reject) => {
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/******/ installedChunkData = installedChunks[chunkId] = [resolve, reject];
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/******/ });
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/******/ promises.push(installedChunkData[2] = promise);
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/******/
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/******/ // start chunk loading
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/******/ var url = __webpack_require__.p + __webpack_require__.u(chunkId);
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/******/ // create error before stack unwound to get useful stacktrace later
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/******/ var error = new Error();
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/******/ var loadingEnded = (event) => {
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/******/ if(__webpack_require__.o(installedChunks, chunkId)) {
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/******/ installedChunkData = installedChunks[chunkId];
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/******/ if(installedChunkData !== 0) installedChunks[chunkId] = undefined;
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/******/ if(installedChunkData) {
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/******/ var errorType = event && (event.type === 'load' ? 'missing' : event.type);
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/******/ var realSrc = event && event.target && event.target.src;
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/******/ error.message = 'Loading chunk ' + chunkId + ' failed.\n(' + errorType + ': ' + realSrc + ')';
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/******/ error.name = 'ChunkLoadError';
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/******/ error.type = errorType;
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/******/ error.request = realSrc;
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/******/ installedChunkData[1](error);
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/******/ }
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/******/ }
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/******/ };
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/******/ __webpack_require__.l(url, loadingEnded, "chunk-" + chunkId);
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/******/ } else installedChunks[chunkId] = 0;
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/******/ }
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/******/ }
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/******/ };
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/******/
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/******/ // no prefetching
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/******/
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/******/ // no preloaded
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/******/
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/******/ // no HMR
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/******/
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/******/ // no HMR manifest
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/******/
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/******/ // no deferred startup
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/******/
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/******/ // install a JSONP callback for chunk loading
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/******/ var webpackJsonpCallback = (parentChunkLoadingFunction, data) => {
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/******/ var [chunkIds, moreModules, runtime] = data;
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/******/ // add "moreModules" to the modules object,
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/******/ // then flag all "chunkIds" as loaded and fire callback
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/******/ var moduleId, chunkId, i = 0, resolves = [];
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/******/ for(;i < chunkIds.length; i++) {
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/******/ chunkId = chunkIds[i];
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/******/ if(__webpack_require__.o(installedChunks, chunkId) && installedChunks[chunkId]) {
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/******/ resolves.push(installedChunks[chunkId][0]);
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/******/ }
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/******/ installedChunks[chunkId] = 0;
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/******/ }
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/******/ for(moduleId in moreModules) {
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/******/ if(__webpack_require__.o(moreModules, moduleId)) {
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/******/ __webpack_require__.m[moduleId] = moreModules[moduleId];
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/******/ }
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/******/ }
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/******/ if(runtime) runtime(__webpack_require__);
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/******/ if(parentChunkLoadingFunction) parentChunkLoadingFunction(data);
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/******/ while(resolves.length) {
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/******/ resolves.shift()();
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/******/ }
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/******/
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/******/ }
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/******/
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/******/ var chunkLoadingGlobal = self["webpackChunk"] = self["webpackChunk"] || [];
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/******/ chunkLoadingGlobal.forEach(webpackJsonpCallback.bind(null, 0));
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/******/ chunkLoadingGlobal.push = webpackJsonpCallback.bind(null, chunkLoadingGlobal.push.bind(chunkLoadingGlobal));
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/******/
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/******/ // no deferred startup
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/******/ })();
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/******/
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/************************************************************************/
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```
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</details>
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``` js
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(() => {
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/*!********************!*\
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!*** ./example.js ***!
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\********************/
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/*! unknown exports (runtime-defined) */
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/*! runtime requirements: __webpack_require__ */
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async function getTemplate(templateName) {
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try {
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let template = await __webpack_require__(1)(`./${templateName}`);
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console.log(template);
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} catch(err) {
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console.error("template error");
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return new Error(err);
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}
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}
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getTemplate("foo");
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getTemplate("bar");
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getTemplate("baz");
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})();
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/******/ })()
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;
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```
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# Info
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## Unoptimized
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```
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asset output.js 10.9 KiB [emitted] (name: main)
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asset 398.output.js 856 bytes [emitted]
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asset 544.output.js 856 bytes [emitted]
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asset 718.output.js 856 bytes [emitted]
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chunk (runtime: main) output.js (main) 441 bytes (javascript) 5.54 KiB (runtime) [entry] [rendered]
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> ./example.js main
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runtime modules 5.54 KiB 8 modules
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dependent modules 160 bytes [dependent] 1 module
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./example.js 281 bytes [built] [code generated]
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[used exports unknown]
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entry ./example.js main
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chunk (runtime: main) 398.output.js 38 bytes [rendered]
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> ./bar ./templates/ lazy ^\.\/.*$ namespace object ./bar
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> ./bar.js ./templates/ lazy ^\.\/.*$ namespace object ./bar.js
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./templates/bar.js 38 bytes [optional] [built] [code generated]
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[exports: default]
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[used exports unknown]
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context element ./bar ./templates/ lazy ^\.\/.*$ namespace object ./bar
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context element ./bar.js ./templates/ lazy ^\.\/.*$ namespace object ./bar.js
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chunk (runtime: main) 544.output.js 38 bytes [rendered]
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> ./baz ./templates/ lazy ^\.\/.*$ namespace object ./baz
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> ./baz.js ./templates/ lazy ^\.\/.*$ namespace object ./baz.js
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./templates/baz.js 38 bytes [optional] [built] [code generated]
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[exports: default]
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[used exports unknown]
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context element ./baz ./templates/ lazy ^\.\/.*$ namespace object ./baz
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context element ./baz.js ./templates/ lazy ^\.\/.*$ namespace object ./baz.js
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chunk (runtime: main) 718.output.js 38 bytes [rendered]
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> ./foo ./templates/ lazy ^\.\/.*$ namespace object ./foo
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> ./foo.js ./templates/ lazy ^\.\/.*$ namespace object ./foo.js
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./templates/foo.js 38 bytes [optional] [built] [code generated]
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[exports: default]
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[used exports unknown]
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context element ./foo ./templates/ lazy ^\.\/.*$ namespace object ./foo
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context element ./foo.js ./templates/ lazy ^\.\/.*$ namespace object ./foo.js
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webpack 5.11.1 compiled successfully
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```
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## Production mode
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```
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asset output.js 2.43 KiB [emitted] [minimized] (name: main)
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asset 398.output.js 130 bytes [emitted] [minimized]
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asset 544.output.js 130 bytes [emitted] [minimized]
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asset 718.output.js 130 bytes [emitted] [minimized]
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chunk (runtime: main) output.js (main) 441 bytes (javascript) 5.54 KiB (runtime) [entry] [rendered]
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> ./example.js main
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runtime modules 5.54 KiB 8 modules
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dependent modules 160 bytes [dependent] 1 module
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./example.js 281 bytes [built] [code generated]
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[no exports used]
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entry ./example.js main
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chunk (runtime: main) 398.output.js 38 bytes [rendered]
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> ./bar ./templates/ lazy ^\.\/.*$ namespace object ./bar
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> ./bar.js ./templates/ lazy ^\.\/.*$ namespace object ./bar.js
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./templates/bar.js 38 bytes [optional] [built] [code generated]
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[exports: default]
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context element ./bar ./templates/ lazy ^\.\/.*$ namespace object ./bar
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context element ./bar.js ./templates/ lazy ^\.\/.*$ namespace object ./bar.js
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chunk (runtime: main) 544.output.js 38 bytes [rendered]
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> ./baz ./templates/ lazy ^\.\/.*$ namespace object ./baz
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> ./baz.js ./templates/ lazy ^\.\/.*$ namespace object ./baz.js
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./templates/baz.js 38 bytes [optional] [built] [code generated]
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[exports: default]
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context element ./baz ./templates/ lazy ^\.\/.*$ namespace object ./baz
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context element ./baz.js ./templates/ lazy ^\.\/.*$ namespace object ./baz.js
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chunk (runtime: main) 718.output.js 38 bytes [rendered]
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> ./foo ./templates/ lazy ^\.\/.*$ namespace object ./foo
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> ./foo.js ./templates/ lazy ^\.\/.*$ namespace object ./foo.js
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./templates/foo.js 38 bytes [optional] [built] [code generated]
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[exports: default]
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context element ./foo ./templates/ lazy ^\.\/.*$ namespace object ./foo
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context element ./foo.js ./templates/ lazy ^\.\/.*$ namespace object ./foo.js
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webpack 5.11.1 compiled successfully
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```
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