title: Webpack build project with ...argumetns even if babel has perset es2015
body: <p>As you can read the topic of the post. I am using webpack to build project by berset of es2015. Every file is "compiled" correctly, but, as I noticed, webpack add some own variables. I have sow it now because I checked my project in IE11, and it throw the syntax error on (output file):</p>
  
  <pre><code>var Utils = {
  //...
   warn: function () {
      if (window.console &amp;&amp; 'function' === typeof window.console.warn)
        window.console.warn(...arguments);
    },
  
    warnOnce: function(msg) {
      if (!pastWarnings[msg]) {
        pastWarnings[msg] = true;
        this.warn(...arguments);
      }
    },
  //...
  }
  </code></pre>
  
  <p>The problem occur because of <code>...arguments</code>.</p>
  
  <p>Why webpack do it this way?</p>
  
  <p>My webpack config:</p>
  
  <pre><code>module.exports = {
  entry: ['babel-polyfill', path.resolve(__dirname + '/src/app.js')],
  
  output: {
      path: __dirname + '/bin',
      filename: 'app.bundle.js',
  },
  resolve: {
      extensions: ['.js'],
      modules: ['node_modules'],
      alias: {/*...*/}
  },
  devtool: "source-map",
  target: 'web',
  node: {
      fs: "empty"
  },
  plugins: [
      new webpack.ProvidePlugin({/*...*/})
  ],
  module: {
      loaders: [{
          test: /\.js$/,
          exclude: /node_modules/,
          use: [{
              loader: 'babel-loader',
              options: {
                  presets: 'es2015',
              },
          }]
      }, {
          test: /\.scss$/,
          use: [/*...*/]
      }]
  }
  };
  </code></pre>