mirror of https://github.com/webpack/webpack.git
418 lines
14 KiB
Markdown
418 lines
14 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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<details><summary><code>/******/ (function(modules) { /* webpackBootstrap */ })</code></summary>
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``` javascript
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/******/ (function(modules, runtime) { // webpackBootstrap
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/******/ "use strict";
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/******/ // The module cache
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/******/ var installedModules = {};
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/******/
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/******/ // The require function
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/******/ 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)
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/******/ var module = installedModules[moduleId] = {
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/******/ i: moduleId,
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/******/ l: false,
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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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/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
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/******/
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/******/ // Flag the module as loaded
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/******/ module.l = true;
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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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/******/
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/******/ // expose the modules object (__webpack_modules__)
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/******/ __webpack_require__.m = modules;
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/******/
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/******/ // initialize runtime
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/******/ 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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/************************************************************************/
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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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/*!********************!*\
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!*** ./example.js ***!
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\********************/
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/*! no static exports found */
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/*! runtime requirements: __webpack_require__ */
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/***/ (function(__unusedmodule, __unusedexports, __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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/* 1 */
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/*!**************************************************!*\
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!*** ./templates lazy ^\.\/.*$ namespace object ***!
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\**************************************************/
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/*! no static exports found */
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/*! runtime requirements: module, __webpack_require__, __webpack_require__.e */
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/***/ (function(module, __unusedexports, __webpack_require__) {
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var map = {
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"./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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],
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"./foo": [
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4,
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457
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],
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"./foo.js": [
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4,
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457
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]
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};
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function webpackAsyncContext(req) {
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var ids = map[req];
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if(!ids) {
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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';
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throw e;
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});
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}
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return __webpack_require__.e(ids[1]).then(function() {
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var id = ids[0];
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return __webpack_require__(id);
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});
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}
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webpackAsyncContext.keys = function webpackAsyncContextKeys() {
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return Object.keys(map);
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};
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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>function(__webpack_require__) { /* webpackRuntimeModules */ });</code></summary>
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``` js
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/******/ function(__webpack_require__) { // webpackRuntimeModules
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/******/ "use strict";
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/******/
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/******/ /* webpack/runtime/ensure chunk */
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/******/ !function() {
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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 = function requireEnsure(chunkId) {
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/******/ return Promise.all(Object.keys(__webpack_require__.f).reduce(function(promises, key) { __webpack_require__.f[key](chunkId, promises); return promises; }, []));
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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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/******/ !function() {
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/******/ // define __esModule on exports
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/******/ __webpack_require__.r = function(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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/******/ !function() {
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/******/ __webpack_require__.p = "dist/";
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/******/ }();
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/******/
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/******/ /* webpack/runtime/get javascript chunk filename */
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/******/ !function() {
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/******/ __webpack_require__.u = function(chunkId) {
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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/jsonp chunk loading */
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/******/ !function() {
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/******/
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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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/******/ 404: 0
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/******/ };
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/******/
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/******/
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/******/
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/******/ __webpack_require__.f.j = function(chunkId, promises) {
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/******/ // JSONP chunk loading for javascript
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/******/ var installedChunkData = installedChunks[chunkId];
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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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/******/ // setup Promise in chunk cache
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/******/ var promise = new Promise(function(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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/******/ var loadingEnded = function() { if(installedChunks[chunkId]) return installedChunks[chunkId][1]; if(installedChunks[chunkId] !== 0) installedChunks[chunkId] = undefined; };
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/******/ var script = document.createElement('script');
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/******/ var onScriptComplete;
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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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/******/ script.src = url;
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/******/
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/******/ onScriptComplete = function (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 reportError = loadingEnded();
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/******/ if(reportError) {
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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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/******/ var error = new Error('Loading chunk ' + chunkId + ' failed.\n(' + errorType + ': ' + realSrc + ')');
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/******/ error.type = errorType;
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/******/ error.request = realSrc;
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/******/ reportError(error);
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/******/ }
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/******/ };
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/******/ var timeout = setTimeout(function(){
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/******/ onScriptComplete({ type: 'timeout', target: script });
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/******/ }, 120000);
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/******/ script.onerror = script.onload = onScriptComplete;
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/******/ document.head.appendChild(script);
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/******/
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/******/ // no HMR
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/******/ }
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/******/ }
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/******/
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/******/ // no chunk preloading needed
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/******/ };
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/******/
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/******/ // no prefetching
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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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/******/ function webpackJsonpCallback(data) {
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/******/ var chunkIds = data[0];
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/******/ var moreModules = data[1];
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/******/
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/******/ var runtime = data[3];
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/******/
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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(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(Object.prototype.hasOwnProperty.call(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(parentJsonpFunction) parentJsonpFunction(data);
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/******/
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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 jsonpArray = window["webpackJsonp"] = window["webpackJsonp"] || [];
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/******/ var oldJsonpFunction = jsonpArray.push.bind(jsonpArray);
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/******/ jsonpArray.push = webpackJsonpCallback;
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/******/
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/******/ var parentJsonpFunction = oldJsonpFunction;
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/******/ }();
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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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# 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
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374.output.js 539 bytes {374} [emitted]
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457.output.js 539 bytes {457} [emitted]
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920.output.js 539 bytes {920} [emitted]
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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
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> ./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]
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context element ./baz [1] ./templates lazy ^\.\/.*$ namespace object ./baz
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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]
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> .\example.js main
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[0] ./example.js 281 bytes {404} [built]
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[used exports unknown]
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entry .\example.js main
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[1] ./templates lazy ^\.\/.*$ namespace object 160 bytes {404} [optional] [built]
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[used exports unknown]
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import() context lazy ./templates [0] ./example.js 3:23-60
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+ 5 hidden chunk modules
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chunk {457} 457.output.js 38 bytes <{404}> [rendered]
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> ./foo [1] ./templates lazy ^\.\/.*$ namespace object ./foo
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> ./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]
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context element ./foo [1] ./templates lazy ^\.\/.*$ namespace object ./foo
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context element ./foo.js [1] ./templates lazy ^\.\/.*$ namespace object ./foo.js
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chunk {920} 920.output.js 38 bytes <{404}> [rendered]
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> ./bar [1] ./templates lazy ^\.\/.*$ namespace object ./bar
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> ./bar.js [1] ./templates lazy ^\.\/.*$ namespace object ./bar.js
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[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
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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
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374.output.js 119 bytes {374} [emitted]
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457.output.js 119 bytes {457} [emitted]
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920.output.js 119 bytes {920} [emitted]
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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]
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> ./baz [305] ./templates lazy ^\.\/.*$ namespace object ./baz
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> ./baz.js [305] ./templates lazy ^\.\/.*$ namespace object ./baz.js
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[374] ./templates/baz.js 38 bytes {374} [optional] [built]
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[exports: default]
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context element ./baz [305] ./templates lazy ^\.\/.*$ namespace object ./baz
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context element ./baz.js [305] ./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]
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> .\example.js main
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[275] ./example.js 281 bytes {404} [built]
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entry .\example.js main
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[305] ./templates lazy ^\.\/.*$ namespace object 160 bytes {404} [optional] [built]
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import() context lazy ./templates [275] ./example.js 3:23-60
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+ 5 hidden chunk modules
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chunk {457} 457.output.js 38 bytes <{404}> [rendered]
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> ./foo [305] ./templates lazy ^\.\/.*$ namespace object ./foo
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> ./foo.js [305] ./templates lazy ^\.\/.*$ namespace object ./foo.js
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[457] ./templates/foo.js 38 bytes {457} [optional] [built]
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[exports: default]
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context element ./foo [305] ./templates lazy ^\.\/.*$ namespace object ./foo
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context element ./foo.js [305] ./templates lazy ^\.\/.*$ namespace object ./foo.js
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chunk {920} 920.output.js 38 bytes <{404}> [rendered]
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> ./bar [305] ./templates lazy ^\.\/.*$ namespace object ./bar
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> ./bar.js [305] ./templates lazy ^\.\/.*$ namespace object ./bar.js
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[920] ./templates/bar.js 38 bytes {920} [optional] [built]
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[exports: default]
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context element ./bar [305] ./templates lazy ^\.\/.*$ namespace object ./bar
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context element ./bar.js [305] ./templates lazy ^\.\/.*$ namespace object ./bar.js
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```
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