https://www.toptal.com/javascript/hot-module-replacement-in-redux https://webpack.js.org/guides/hot-module-replacement/ https://www.webpackjs.com/concepts/hot-module-replacement/ https://webpack.js.org/configuration/dev-server/#devserver http://gaearon.github.io/react-hot-loader/getstarted/ https://github.com/gaearon/react-hot-loader https://medium.com/@rajaraodv/webpack-hot-module-replacement-hmr-e756a726a07