webpack.config.js

var path = require('path');
var webpack = require('webpack');
var HtmlwebpackPlugin = require('html-webpack-plugin');

var ROOT_PATH = path.resolve(__dirname);
var APP_PATH = path.resolve(ROOT_PATH, 'app');
var BUILD_PATH = path.resolve(ROOT_PATH, 'build');

module.exports= {
  entry: [
    'webpack-dev-server/client?http://localhost:3000',
    'webpack/hot/only-dev-server',
    path.resolve(APP_PATH, 'index.jsx')
  ],
  output: {
    path: BUILD_PATH,
    filename: 'bundle.js',
    publicPath: '/static/'
  },
  //enable dev source map
  devtool: 'eval-source-map',

  resolve: {
      extensions: ['', '.js', '.jsx']
  },
  module: {
    loaders: [
      {
        test: /\.jsx?$/,
        loaders: ['babel'],
        include: APP_PATH
      },
      {
        test: /\.scss$/,
        loaders: ['style', 'css', 'sass']
      }
    ]
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin()
  ]
}