webpack.config.js

module.exports = {
  cache: true,

  resolve: {
    extensions: ['', '.js', '.jsx']
  },
  devtool: 'source-map',
  context: __dirname,

  entry: {
    app: [
      'webpack/hot/dev-server',
      './app.jsx'
    ]
  },

  output: {
    path: './build',
    filename: 'bundle.js',
    publicPath: '/build/'
  },

  devServer: {
    host: '0.0.0.0',
    port: 8080,
    inline: true
  },

  module: {
    loaders: [{
      test: /(\.js|\.jsx)$/,
      loader: 'babel',
      query: {
        presets: ['react', 'es2015', 'stage-0']
      }
    }]
  }
};