webpack.config.js

# Relevant bits only

{
    entry: {
        main: [
            'webpack-dev-server/client?http://localhost:8080',
            'webpack/hot/only-dev-server',
            ...
        ]
        vendor: ['jquery', 'react', 'reflux', 'react/lib/ReactComponentBrowserEnvironment']
    }
    module: {
        loaders: [{test: '.jsx', loader: 'react-hot!jsx?harmony'}, ...]
    }
    plugins: [
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NoErrorsPlugin(),
        ...
    ]
}