Webpack build commenting out bundle

Question

I use webpack with a very simple config:

module.exports = {
 entry: './index.js',
 output: {
 path: __dirname,
 filename: 'bundle.js'
 },
 module: {
 loaders: [
 {
 test: /\.jsx?$/,
 loader: 'babel',
 exclude: /node_modules/,
 query: {
 presets: [
 'es2015',
 'stage-0',
 'react'
 ]
 }
 }
 ]
 }
}

Running webpack or webpack-dev-server yields this bundle.js:

/******/ (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] = {
/******/ exports: {},
/******/ id: moduleId,
/******/ loaded: false
/******/ };
/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/ // Flag the module as loaded
/******/ module.loaded = 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;
/******/ // __webpack_public_path__
/******/ __webpack_require__.p = "";
/******/ // Load entry module and return exports
/******/ return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ function(module, exports) {
 'use strict';
 alert('test');
/***/ }
/******/ ]);

Where does these comments come from?

Answer 1

These comments come from Webpack itself. While webpack-dev-server will bundle your modules into folders, minification isn't applied when you're running webpack-dev-server. In production, when full minification is applied, these comments wouldn't be added.

• darksoulsong: And what about if I just need to remove the comments without minifying the bundle? Is it possible?