Some packages.

https://www.npmjs.com/package/fast-deep-equal

Downgrade Node 9 in MacOS

https://medium.com/@mahasakpijittum/downgrade-node-9-in-macos-18a3a55d5436

facebook create-react-app

https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/config/webpackDevServer.config.js