mirror of https://github.com/webpack/webpack.git
173 lines
4.5 KiB
Markdown
173 lines
4.5 KiB
Markdown
This very simple example shows usage of CommonJS.
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The three files `example.js`, `increment.js` and `math.js` form a dependency chain. They use `require(dependency)` to declare dependencies.
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You can see the output file that webpack creates by bundling them together in one file. Keep in mind that webpack adds comments to make reading this file easier. These comments are removed when minimizing the file.
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You can also see the info messages webpack prints to console (for both normal and minimized build).
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# example.js
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``` javascript
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const inc = require('./increment').increment;
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const a = 1;
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inc(a); // 2
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```
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# increment.js
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``` javascript
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const add = require('./math').add;
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exports.increment = function(val) {
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return add(val, 1);
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};
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```
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# math.js
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``` javascript
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exports.add = function() {
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var sum = 0, i = 0, args = arguments, l = args.length;
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while (i < l) {
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sum += args[i++];
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}
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return sum;
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};
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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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/******/
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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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const inc = __webpack_require__(/*! ./increment */ 1).increment;
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const a = 1;
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inc(a); // 2
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/***/ }),
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/* 1 */
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/*!**********************!*\
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!*** ./increment.js ***!
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\**********************/
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/*! no static exports found */
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/*! runtime requirements: __webpack_require__, __webpack_exports__ */
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/***/ (function(__unusedmodule, exports, __webpack_require__) {
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const add = __webpack_require__(/*! ./math */ 2).add;
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exports.increment = function(val) {
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return add(val, 1);
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};
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/***/ }),
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/* 2 */
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/*!*****************!*\
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!*** ./math.js ***!
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\*****************/
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/*! no static exports found */
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/*! runtime requirements: __webpack_exports__ */
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/***/ (function(__unusedmodule, exports) {
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exports.add = function() {
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var sum = 0, i = 0, args = arguments, l = args.length;
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while (i < l) {
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sum += args[i++];
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}
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return sum;
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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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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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output.js 2.21 KiB {0} [emitted] main
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Entrypoint main = output.js
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chunk {0} output.js (main) 326 bytes [entry] [rendered]
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> .\example.js main
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[0] ./example.js 72 bytes {0} [built]
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[used exports unknown]
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entry .\example.js main
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[1] ./increment.js 98 bytes {0} [built]
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[used exports unknown]
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cjs require ./increment [0] ./example.js 1:12-34
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[2] ./math.js 156 bytes {0} [built]
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[used exports unknown]
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cjs require ./math [1] ./increment.js 1:12-29
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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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output.js 407 bytes {404} [emitted] main
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Entrypoint main = output.js
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chunk {404} output.js (main) 326 bytes [entry] [rendered]
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> .\example.js main
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[275] ./example.js 72 bytes {404} [built]
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entry .\example.js main
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[529] ./increment.js 98 bytes {404} [built]
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cjs require ./increment [275] ./example.js 1:12-34
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[702] ./math.js 156 bytes {404} [built]
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cjs require ./math [529] ./increment.js 1:12-29
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``` |