webpack.dev.js

var path = require('path');
var webpack = require('webpack');
var hotMiddlewareScript = 'webpack-hot-middleware/client?path=/__webpack_hmr&timeout=20000&reload=true';

module.exports = {
  devtool: 'source-map',
  entry: {
    app: ['webpack-hot-middleware/client', './client/App']
  },
  output: {
    path: path.join(__dirname, 'public', 'js'),
    filename: 'app.js',
    publicPath: '/js/'
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.NamedModulesPlugin(),
    new webpack.DefinePlugin({
      'process.env': {
        'NODE_ENV': JSON.stringify('development')
      }
    })
  ],
  module: {
    loaders: [{
      test: /\.js$/,
      loaders: ['babel-loader'],
      include: path.join(__dirname, 'client')
    }, {
      test: /\.(css|scss|sass)$/,
      loaders: ['style-loader', 'css-loader', 'sass-loader']
    }]
  }
};