# example.js ``` javascript // use our loader console.dir(require("./loader!./file")); // use buildin css loader console.dir(require("./test.css")); // default by extension console.dir(require("!css-loader!./test.css")); // manual ``` # file.js ``` javascript exports.foo = "bar"; ``` # loader.js ``` javascript module.exports = function(content) { return "exports.answer = 42;\n" + content; } ``` # test.css ``` css .some-class { color: hotpink; } ``` # dist/output.js
/******/ (function(modules) { /* webpackBootstrap */ }) ``` javascript /******/ (function(modules) { // webpackBootstrap /******/ // The module cache /******/ var installedModules = {}; /******/ /******/ // The require function /******/ function __webpack_require__(moduleId) { /******/ /******/ // Check if module is in cache /******/ if(installedModules[moduleId]) { /******/ return installedModules[moduleId].exports; /******/ } /******/ // Create a new module (and put it into the cache) /******/ var module = installedModules[moduleId] = { /******/ i: moduleId, /******/ l: false, /******/ exports: {} /******/ }; /******/ /******/ // Execute the module function /******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__); /******/ /******/ // Flag the module as loaded /******/ module.l = true; /******/ /******/ // Return the exports of the module /******/ return module.exports; /******/ } /******/ /******/ /******/ // expose the modules object (__webpack_modules__) /******/ __webpack_require__.m = modules; /******/ /******/ // expose the module cache /******/ __webpack_require__.c = installedModules; /******/ /******/ // define getter function for harmony exports /******/ __webpack_require__.d = function(exports, name, getter) { /******/ if(!__webpack_require__.o(exports, name)) { /******/ Object.defineProperty(exports, name, { /******/ configurable: false, /******/ enumerable: true, /******/ get: getter /******/ }); /******/ } /******/ }; /******/ /******/ // define __esModule on exports /******/ __webpack_require__.r = function(exports) { /******/ Object.defineProperty(exports, '__esModule', { value: true }); /******/ }; /******/ /******/ // getDefaultExport function for compatibility with non-harmony modules /******/ __webpack_require__.n = function(module) { /******/ var getter = module && module.__esModule ? /******/ function getDefault() { return module['default']; } : /******/ function getModuleExports() { return module; }; /******/ __webpack_require__.d(getter, 'a', getter); /******/ return getter; /******/ }; /******/ /******/ // Object.prototype.hasOwnProperty.call /******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); }; /******/ /******/ // __webpack_public_path__ /******/ __webpack_require__.p = "dist/"; /******/ /******/ /******/ // Load entry module and return exports /******/ return __webpack_require__(__webpack_require__.s = 0); /******/ }) /************************************************************************/ ```
``` javascript /******/ ([ /* 0 */ /*!********************!*\ !*** ./example.js ***! \********************/ /*! no static exports found */ /***/ (function(module, exports, __webpack_require__) { // use our loader console.dir(__webpack_require__(/*! ./loader!./file */ 1)); // use buildin css loader console.dir(__webpack_require__(/*! ./test.css */ 2)); // default by extension console.dir(__webpack_require__(/*! css-loader!./test.css */ 2)); // manual /***/ }), /* 1 */ /*!*****************************!*\ !*** ./loader.js!./file.js ***! \*****************************/ /*! no static exports found */ /***/ (function(module, exports) { exports.answer = 42; exports.foo = "bar"; /***/ }), /* 2 */ /*!****************************************************!*\ !*** (webpack)/node_modules/css-loader!./test.css ***! \****************************************************/ /*! no static exports found */ /***/ (function(module, exports, __webpack_require__) { exports = module.exports = __webpack_require__(/*! ../../node_modules/css-loader/lib/css-base.js */ 3)(undefined); // imports // module exports.push([module.i, ".some-class {\r\n\tcolor: hotpink;\r\n}\r\n", ""]); // exports /***/ }), /* 3 */ /*!*********************************************************!*\ !*** (webpack)/node_modules/css-loader/lib/css-base.js ***! \*********************************************************/ /*! no static exports found */ /***/ (function(module, exports) { /* MIT License http://www.opensource.org/licenses/mit-license.php Author Tobias Koppers @sokra */ // css base code, injected by the css-loader module.exports = function(useSourceMap) { var list = []; // return the list of modules as css string list.toString = function toString() { return this.map(function (item) { var content = cssWithMappingToString(item, useSourceMap); if(item[2]) { return "@media " + item[2] + "{" + content + "}"; } else { return content; } }).join(""); }; // import a list of modules into the list list.i = function(modules, mediaQuery) { if(typeof modules === "string") modules = [[null, modules, ""]]; var alreadyImportedModules = {}; for(var i = 0; i < this.length; i++) { var id = this[i][0]; if(typeof id === "number") alreadyImportedModules[id] = true; } for(i = 0; i < modules.length; i++) { var item = modules[i]; // skip already imported module // this implementation is not 100% perfect for weird media query combinations // when a module is imported multiple times with different media queries. // I hope this will never occur (Hey this way we have smaller bundles) if(typeof item[0] !== "number" || !alreadyImportedModules[item[0]]) { if(mediaQuery && !item[2]) { item[2] = mediaQuery; } else if(mediaQuery) { item[2] = "(" + item[2] + ") and (" + mediaQuery + ")"; } list.push(item); } } }; return list; }; function cssWithMappingToString(item, useSourceMap) { var content = item[1] || ''; var cssMapping = item[3]; if (!cssMapping) { return content; } if (useSourceMap && typeof btoa === 'function') { var sourceMapping = toComment(cssMapping); var sourceURLs = cssMapping.sources.map(function (source) { return '/*# sourceURL=' + cssMapping.sourceRoot + source + ' */' }); return [content].concat(sourceURLs).concat([sourceMapping]).join('\n'); } return [content].join('\n'); } // Adapted from convert-source-map (MIT) function toComment(sourceMap) { // eslint-disable-next-line no-undef var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))); var data = 'sourceMappingURL=data:application/json;charset=utf-8;base64,' + base64; return '/*# ' + data + ' */'; } /***/ }) /******/ ]); ``` # Console output Prints in node.js (`enhanced-require example.js`) and in browser: ``` { answer: 42, foo: 'bar' } { foobar: 1234 } { foobar: 1234 } ``` # Info ## Unoptimized ``` Hash: 0a1b2c3d4e5f6a7b8c9d Version: webpack 4.0.0-beta.2 Asset Size Chunks Chunk Names output.js 6.2 KiB 0 [emitted] main Entrypoint main = output.js chunk {0} output.js (main) 2.66 KiB [entry] [rendered] > .\example.js main [0] ./example.js 210 bytes {0} [built] single entry .\example.js main [1] ./loader.js!./file.js 41 bytes {0} [built] cjs require ./loader!./file [0] ./example.js 2:12-38 [2] (webpack)/node_modules/css-loader!./test.css 209 bytes {0} [built] cjs require !css-loader!./test.css [0] ./example.js 6:12-45 cjs require ./test.css [0] ./example.js 5:12-33 + 1 hidden module ``` ## Production mode ``` Hash: 0a1b2c3d4e5f6a7b8c9d Version: webpack 4.0.0-beta.2 Asset Size Chunks Chunk Names output.js 1.53 KiB 0 [emitted] main Entrypoint main = output.js chunk {0} output.js (main) 2.66 KiB [entry] [rendered] > .\example.js main [0] (webpack)/node_modules/css-loader!./test.css 209 bytes {0} [built] cjs require !css-loader!./test.css [3] ./example.js 6:12-45 cjs require ./test.css [3] ./example.js 5:12-33 [2] ./loader.js!./file.js 41 bytes {0} [built] cjs require ./loader!./file [3] ./example.js 2:12-38 [3] ./example.js 210 bytes {0} [built] single entry .\example.js main + 1 hidden module ```