webpack/examples/require.resolve

example.js

var a = require("./a");

// get module id
var aId = require.resolve("./a.js");

// clear module in require.cache
delete require.cache[aId];

// require module again, it should be reexecuted
var a2 = require("./a");

// vertify it
if(a == a2) throw new Error("Cache clear failed :(");

a.js

module.exports = Math.random();

js/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;

// // identity function for calling harmony imports with the correct context // webpack_require.i = function(value) { return value; };

// // 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 // }); // } // };

// // 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 = "js/";

// // Load entry module and return exports // return webpack_require(webpack_require.s = 1); // }) /******************************************************************/

</details>
``` javascript
/******/ ([
/* 0 */
/* unknown exports provided */
/* all exports used */
/*!**************!*\
  !*** ./a.js ***!
  \**************/
/***/ function(module, exports) {

module.exports = Math.random();

/***/ },
/* 1 */
/* unknown exports provided */
/* all exports used */
/*!********************!*\
  !*** ./example.js ***!
  \********************/
/***/ function(module, exports, __webpack_require__) {

var a = __webpack_require__(/*! ./a */ 0);

// get module id
var aId = /*require.resolve*/(/*! ./a.js */ 0);

// clear module in require.cache
delete __webpack_require__.c[aId];

// require module again, it should be reexecuted
var a2 = __webpack_require__(/*! ./a */ 0);

// vertify it
if(a == a2) throw new Error("Cache clear failed :(");

/***/ }
/******/ ]);

Info

Uncompressed

Hash: 00060b879bc0621a21be
Version: webpack 2.2.0-rc.2
    Asset     Size  Chunks             Chunk Names
output.js  3.21 kB       0  [emitted]  main
Entrypoint main = output.js
chunk    {0} output.js (main) 326 bytes [entry] [rendered]
    > main [1] ./example.js 
    [0] ./a.js 31 bytes {0} [built]
        cjs require ./a [1] ./example.js 1:8-22
        cjs require ./a [1] ./example.js 10:9-23
        require.resolve ./a.js [1] ./example.js 4:10-35
    [1] ./example.js 295 bytes {0} [built]

Minimized (uglify-js, no zip)

Hash: 00060b879bc0621a21be
Version: webpack 2.2.0-rc.2
    Asset       Size  Chunks             Chunk Names
output.js  644 bytes       0  [emitted]  main
Entrypoint main = output.js
chunk    {0} output.js (main) 326 bytes [entry] [rendered]
    > main [1] ./example.js 
    [0] ./a.js 31 bytes {0} [built]
        cjs require ./a [1] ./example.js 1:8-22
        cjs require ./a [1] ./example.js 10:9-23
        require.resolve ./a.js [1] ./example.js 4:10-35
    [1] ./example.js 295 bytes {0} [built]