react-hot-webpack.config.js

const webpack = require('webpack');
const path = require('path');

module.exports = {
  entry: [
    'babel-polyfill',
    path.join(__dirname, '/src/index.js')
  ],
  devtool: "source-map",
  output: {
    path: path.join(__dirname, '/public'),
    filename: 'bundle.js',
    publicPath: 'assets',
  },
  module: {
    loaders: [{
        test: /\.js$/,
        exclude: /(node_modules)/,
        loader: 'babel-loader',
        query: {
          presets: ['latest', 'react']
        }
      }
    ]
  },
  plugins: [
    new webpack.NoErrorsPlugin(),
    new webpack.HotModuleReplacementPlugin()
  ],
  devServer: {
    contentBase: 'public',
    hot: true,
    inline: true,
    port: 8080,
    host: 'localhost',
    proxy: {
      '/**': {
        target: '/index.html',
        secure: false,
        bypass: function(req, res, opt) {
          var hotupd = /(\/[a-z0-9\.]*\.hot-update\..*)$$/gi
          var match = hotupd.exec(req.path);

          if(match && match[1]) {
            return match[1];
          }

          if (req.headers.accept && req.headers.accept.indexOf('html') !== -1) {
            return '/index.html';
          }
        }
      }
    }
  }
};