react-hot-loader v3

create-react-app

if (module.hot) {
   module.hot.accept();
}

    module: {
        loaders: [
            {
                test: /\.js$/,
                loaders: ['react-hot', 'babel?' + JSON.stringify({
                    cacheDirectory: true,
                    presets: ['es2015', 'stage-0', 'react']
                })],
                exclude: /node_modules/
            }
        ]
    },

{
  "presets": ["es2015-loose", "stage-0", "react"],
  "plugins": ["react-hot-loader/babel"]
}

    module: {
        loaders: [
            {
                test: /\.js$/,
                loaders: ['react-hot-loader/webpack', 'babel?' + JSON.stringify({
                    cacheDirectory: true,
                    presets: ['es2015', 'stage-0', 'react']
                })],
                exclude: /node_modules/
            }
        ]
    },

if (module.hot) {
  module.hot.accept('./containers/App', () => {
    const NextApp = require('./containers/App').default;
    ReactDOM.render(
      <AppContainer>
        <NextApp/>
      </AppContainer>
      ,
      document.getElementById('root')
    );
  });
}

https://github.com/gaearon/react-hot-boilerplate/tree/next

https://github.com/gaearon/react-hot-loader/tree/next-docs/docs

THANKS!