mirror of https://github.com/webpack/webpack.git
395 lines
12 KiB
Markdown
395 lines
12 KiB
Markdown
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# 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("a");
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getTemplate("b");
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getTemplate("c");
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```
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# templates/
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* a.js
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* b.js
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* c.js
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All templates are of this pattern:
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``` javascript
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module.exports = function() {
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return "This text was generated by template X";
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}
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```
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# js/output.js
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<details><summary>`/******/ (function(modules) { /* webpackBootstrap */ })`</summary>
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``` javascript
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/******/ (function(modules) { // webpackBootstrap
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/******/ // install a JSONP callback for chunk loading
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/******/ var parentJsonpFunction = window["webpackJsonp"];
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/******/ window["webpackJsonp"] = function webpackJsonpCallback(chunkIds, moreModules, executeModules) {
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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 = [], result;
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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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/******/ 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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/******/ modules[moduleId] = moreModules[moduleId];
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/******/ }
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/******/ }
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/******/ if(parentJsonpFunction) parentJsonpFunction(chunkIds, moreModules, executeModules);
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/******/ while(resolves.length)
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/******/ resolves.shift()();
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/******/ };
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/******/ // The module cache
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/******/ var installedModules = {};
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/******/ // objects to store loaded and loading chunks
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/******/ var installedChunks = {
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/******/ 6: 0
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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(installedModules[moduleId])
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/******/ return installedModules[moduleId].exports;
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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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/******/ // Execute the module function
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/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
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/******/ // Flag the module as loaded
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/******/ module.l = true;
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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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/******/ // 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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/******/ if(installedChunks[chunkId] === 0)
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/******/ return Promise.resolve();
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/******/ // an Promise means "currently loading".
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/******/ if(installedChunks[chunkId]) {
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/******/ return installedChunks[chunkId][2];
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/******/ }
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/******/ // start chunk loading
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/******/ var head = document.getElementsByTagName('head')[0];
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/******/ var script = document.createElement('script');
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/******/ script.type = 'text/javascript';
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/******/ script.charset = 'utf-8';
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/******/ script.async = true;
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/******/ script.timeout = 120000;
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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 = __webpack_require__.p + "" + chunkId + ".output.js";
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/******/ var timeout = setTimeout(onScriptComplete, 120000);
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/******/ script.onerror = script.onload = onScriptComplete;
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/******/ function onScriptComplete() {
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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 chunk = installedChunks[chunkId];
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/******/ if(chunk !== 0) {
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/******/ if(chunk) chunk[1](new Error('Loading chunk ' + chunkId + ' failed.'));
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/******/ installedChunks[chunkId] = undefined;
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/******/ }
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/******/ };
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/******/ head.appendChild(script);
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/******/ var promise = new Promise(function(resolve, reject) {
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/******/ installedChunks[chunkId] = [resolve, reject];
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/******/ });
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/******/ return installedChunks[chunkId][2] = promise;
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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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/******/ // expose the module cache
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/******/ __webpack_require__.c = installedModules;
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/******/ // identity function for calling harmony imports with the correct context
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/******/ __webpack_require__.i = function(value) { return value; };
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/******/ // define getter function for harmony exports
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/******/ __webpack_require__.d = function(exports, name, getter) {
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/******/ if(!__webpack_require__.o(exports, name)) {
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/******/ Object.defineProperty(exports, name, {
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/******/ configurable: false,
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/******/ enumerable: true,
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/******/ get: getter
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/******/ });
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/******/ }
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/******/ };
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/******/ // getDefaultExport function for compatibility with non-harmony modules
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/******/ __webpack_require__.n = function(module) {
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/******/ var getter = module && module.__esModule ?
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/******/ function getDefault() { return module['default']; } :
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/******/ function getModuleExports() { return module; };
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/******/ __webpack_require__.d(getter, 'a', getter);
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/******/ return getter;
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/******/ };
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/******/ // Object.prototype.hasOwnProperty.call
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/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
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/******/ // __webpack_public_path__
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/******/ __webpack_require__.p = "js/";
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/******/ // on error function for async loading
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/******/ __webpack_require__.oe = function(err) { console.error(err); throw err; };
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/******/ // Load entry module and return exports
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/******/ return __webpack_require__(__webpack_require__.s = 7);
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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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/* unknown exports provided */
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/* all exports used */
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/*!**********************************!*\
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!*** ./templates async ^\.\/.*$ ***!
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\**********************************/
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/***/ function(module, exports, __webpack_require__) {
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var map = {
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"./a": [
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1,
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5
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],
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"./a.js": [
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1,
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5
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],
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"./b": [
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2,
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4
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],
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"./b.js": [
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2,
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4
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],
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"./bar": [
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3,
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3
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],
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"./bar.js": [
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3,
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3
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],
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"./baz": [
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4,
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2
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],
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"./baz.js": [
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4,
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2
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],
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"./c": [
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5,
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1
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],
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"./c.js": [
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5,
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1
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],
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"./foo": [
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6,
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0
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],
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"./foo.js": [
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6,
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0
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]
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};
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function webpackAsyncContext(req) {
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var ids = map[req]; if(!ids)
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return Promise.reject(new Error("Cannot find module '" + req + "'."));
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return __webpack_require__.e(ids[1]).then(function() {
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return __webpack_require__(ids[0]);
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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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module.exports = webpackAsyncContext;
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webpackAsyncContext.id = 0;
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/***/ },
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/***/ 7:
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/* unknown exports provided */
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/* all exports used */
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/*!********************!*\
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!*** ./example.js ***!
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\********************/
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/***/ function(module, exports, __webpack_require__) {
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// function getTemplate(templateName) {
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// return import("./templates/"+templateName);
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// }
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// console.log(getTemplate("a"));
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// console.log(getTemplate("b"));
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async function getTemplate(templateName) {
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try {
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let template = await __webpack_require__(/*! ./templates */ 0)(`./${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("a");
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getTemplate("b");
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getTemplate("c");
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/***/ }
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/******/ });
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```
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# Info
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## Uncompressed
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```
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Hash: 2143ae7aacbfebfb3d32
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Version: webpack 2.1.0-beta.27
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Time: 102ms
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Asset Size Chunks Chunk Names
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0.output.js 399 bytes 0 [emitted]
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1.output.js 301 bytes 1 [emitted]
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2.output.js 399 bytes 2 [emitted]
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3.output.js 399 bytes 3 [emitted]
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4.output.js 301 bytes 4 [emitted]
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5.output.js 307 bytes 5 [emitted]
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output.js 7.08 kB 6 [emitted] main
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Entrypoint main = output.js
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chunk {0} 0.output.js 38 bytes {6} [rendered]
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[6] ./templates/foo.js 38 bytes {0} [optional] [built]
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[exports: default]
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context element ./foo [0] ./templates async ^\.\/.*$
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context element ./foo.js [0] ./templates async ^\.\/.*$
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chunk {1} 1.output.js 80 bytes {6} [rendered]
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[5] ./templates/c.js 80 bytes {1} [optional] [built]
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context element ./c [0] ./templates async ^\.\/.*$
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context element ./c.js [0] ./templates async ^\.\/.*$
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chunk {2} 2.output.js 38 bytes {6} [rendered]
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[4] ./templates/baz.js 38 bytes {2} [optional] [built]
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[exports: default]
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context element ./baz [0] ./templates async ^\.\/.*$
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context element ./baz.js [0] ./templates async ^\.\/.*$
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chunk {3} 3.output.js 38 bytes {6} [rendered]
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[3] ./templates/bar.js 38 bytes {3} [optional] [built]
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[exports: default]
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context element ./bar [0] ./templates async ^\.\/.*$
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context element ./bar.js [0] ./templates async ^\.\/.*$
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chunk {4} 4.output.js 80 bytes {6} [rendered]
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[2] ./templates/b.js 80 bytes {4} [optional] [built]
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context element ./b [0] ./templates async ^\.\/.*$
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context element ./b.js [0] ./templates async ^\.\/.*$
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chunk {5} 5.output.js 80 bytes {6} [rendered]
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[1] ./templates/a.js 80 bytes {5} [optional] [built]
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context element ./a [0] ./templates async ^\.\/.*$
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context element ./a.js [0] ./templates async ^\.\/.*$
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chunk {6} output.js (main) 597 bytes [entry] [rendered]
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> main [7] ./example.js
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[0] ./templates async ^\.\/.*$ 160 bytes {6} [optional] [built]
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System.import context ./templates [7] ./example.js 9:23-60
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[7] ./example.js 437 bytes {6} [built]
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```
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## Minimized (uglify-js, no zip)
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```
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Hash: 2143ae7aacbfebfb3d32
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Version: webpack 2.1.0-beta.27
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Time: 152ms
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Asset Size Chunks Chunk Names
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0.output.js 125 bytes 0 [emitted]
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1.output.js 105 bytes 1 [emitted]
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2.output.js 125 bytes 2 [emitted]
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3.output.js 125 bytes 3 [emitted]
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4.output.js 105 bytes 4 [emitted]
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5.output.js 104 bytes 5 [emitted]
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output.js 6.75 kB 6 [emitted] main
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Entrypoint main = output.js
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chunk {0} 0.output.js 38 bytes {6} [rendered]
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[6] ./templates/foo.js 38 bytes {0} [optional] [built]
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[exports: default]
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context element ./foo [0] ./templates async ^\.\/.*$
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context element ./foo.js [0] ./templates async ^\.\/.*$
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chunk {1} 1.output.js 80 bytes {6} [rendered]
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[5] ./templates/c.js 80 bytes {1} [optional] [built]
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context element ./c [0] ./templates async ^\.\/.*$
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context element ./c.js [0] ./templates async ^\.\/.*$
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chunk {2} 2.output.js 38 bytes {6} [rendered]
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[4] ./templates/baz.js 38 bytes {2} [optional] [built]
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[exports: default]
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|
|
context element ./baz [0] ./templates async ^\.\/.*$
|
||
|
|
context element ./baz.js [0] ./templates async ^\.\/.*$
|
||
|
|
chunk {3} 3.output.js 38 bytes {6} [rendered]
|
||
|
|
[3] ./templates/bar.js 38 bytes {3} [optional] [built]
|
||
|
|
[exports: default]
|
||
|
|
context element ./bar [0] ./templates async ^\.\/.*$
|
||
|
|
context element ./bar.js [0] ./templates async ^\.\/.*$
|
||
|
|
chunk {4} 4.output.js 80 bytes {6} [rendered]
|
||
|
|
[2] ./templates/b.js 80 bytes {4} [optional] [built]
|
||
|
|
context element ./b [0] ./templates async ^\.\/.*$
|
||
|
|
context element ./b.js [0] ./templates async ^\.\/.*$
|
||
|
|
chunk {5} 5.output.js 80 bytes {6} [rendered]
|
||
|
|
[1] ./templates/a.js 80 bytes {5} [optional] [built]
|
||
|
|
context element ./a [0] ./templates async ^\.\/.*$
|
||
|
|
context element ./a.js [0] ./templates async ^\.\/.*$
|
||
|
|
chunk {6} output.js (main) 597 bytes [entry] [rendered]
|
||
|
|
> main [7] ./example.js
|
||
|
|
[0] ./templates async ^\.\/.*$ 160 bytes {6} [optional] [built]
|
||
|
|
System.import context ./templates [7] ./example.js 9:23-60
|
||
|
|
[7] ./example.js 437 bytes {6} [built]
|
||
|
|
|
||
|
|
```
|