title: babel-loader not transpiling and without error
body: <p>Why isn't my babel-loader transpiling?
  I've added: let x = 'LOL'; console.log(x); to my src/main.js.
  It doesn't output any errors and creates the output file. But it doesn't transpile es6 syntax to es5.</p>
  
  <p>This is my src/main.js</p>
  
  <pre><code>var css = require('./styles.scss');
  
  console.log('hello planet!');
  
  let x = 'LOL';
  console.log(x);
  </code></pre>
  
  <p>and my output file dist/bundle.min.js looks like this (let isnt turned into var):</p>
  
  <pre><code>/******/ (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 &amp;&amp; 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 = "";
  /******/
  /******/    // Load entry module and return exports
  /******/    return __webpack_require__(__webpack_require__.s = 1);
  /******/ })
  /************************************************************************/
  /******/ ([
  /* 0 */
  /***/ (function(module, exports) {
  
  // removed by extract-text-webpack-plugin
  
  /***/ }),
  /* 1 */
  /***/ (function(module, exports, __webpack_require__) {
  
  var css = __webpack_require__(0);
  
  console.log('hello planet!');
  
  let x = 'LOL';
  console.log(x);
  
  /***/ })
  /******/ ]);
  </code></pre>
  
  <p>my webpack.config.js:</p>
  
  <pre><code>var path = require('path');
  var HtmlWebpackPlugin = require('html-webpack-plugin');
  const ExtractTextPlugin = require("extract-text-webpack-plugin");
  
  module.exports = {
      entry: './src/main.js',
      output: {
          path: path.resolve(__dirname, 'dist'),
          filename: 'bundle.min.js'
      },
      module: {
          rules: [{
              test: /\.js$/,
              exclude: /(node_modules|bower_components)/,
              use: {
                  loader: 'babel-loader',
                  options: {
                      presets: ['env']
                  }
              },
              test: /\.scss$/,
              use: ExtractTextPlugin.extract({
                  fallback: 'style-loader',
                  use: ['css-loader', 'sass-loader'],
                  publicPath: "/dist"
              })
          }]
      },
      devServer: {
          contentBase: path.join(__dirname, "dist"),
          compress: true,
          stats: "errors-only"
      },
      plugins: [
          new HtmlWebpackPlugin({
              title: 'Custom template',
              // minify: {
              //       collapseWhitespace: true
              // },
              hash: true,
              // filename: './../index.html',
              template: './src/template.html',
          }),
          new ExtractTextPlugin({
              filename: "style.css",
              disable: false,
              allChunks: true
          })
      ]
  }
  </code></pre>
  
  <p>my package.json:</p>
  
  <pre><code>{
    "name": "pack3",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
      "test": "echo \"Error: no test specified\" &amp;&amp; exit 1",
      "dev": "webpack-dev-server --open",
      "dev-old": "webpack -d --watch",
      "prod": "webpack",
      "clean": "rimraf ./dist/*"
    },
    "keywords": [],
    "author": "",
    "license": "ISC",
    "devDependencies": {
      "babel-core": "^6.24.1",
      "babel-loader": "^7.0.0",
      "babel-preset-env": "^1.4.0",
      "css-loader": "^0.28.0",
      "extract-text-webpack-plugin": "^2.1.0",
      "html-webpack-plugin": "^2.28.0",
      "node-sass": "^4.5.2",
      "react": "^15.5.4",
      "react-dom": "^15.5.4",
      "rimraf": "^2.6.1",
      "sass-loader": "^6.0.3",
      "style-loader": "^0.16.1",
      "webpack": "^2.4.1",
      "webpack-dev-server": "^2.4.4"
    }
  }
  </code></pre>