webpack.dev.config.js

 var path = require('path')
 var webpack = require('webpack')

 var config = {

    entry: [
    'webpack-hot-middleware/client',
    './app/entry/index'
    ],

   output: {
      path:path.join(__dirname, "public"),
      filename: 'bundle.js',
      publicPath: '/static'
   },
	
	 devtool: 'cheap-module-eval-source-map',
   

   module: {
      loaders: [
            {
                test: /\.jsx?$/, 
                loader: "babel", 
                exclude: /node_modules/, 
                query: {
                    presets: ['es2015', 'react']
                }
            },
            {
              test: /\.less$/,
              loader: 'style!css!less',
            },
            {
                test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
                loader: 'url',
                query: {
                    limit: 10000
                }
            }
      ]
   },

   plugins: [
        new webpack.HotModuleReplacementPlugin(),
        new webpack.DefinePlugin({
            'process.env.NODE_ENV': '"production"'
        }),
        new webpack.optimize.UglifyJsPlugin({
            compress: {
            warnings: false
        }
     })
   ]
}

module.exports = config;