import and export in nodejs link

https://hackernoon.com/import-export-default-require-commandjs-javascript-nodejs-es6-vs-cheatsheet-different-tutorial-example-5a321738b50f


https://www.npmjs.com/package/import-export


https://medium.com/the-node-js-collection/an-update-on-es6-modules-in-node-js-42c958b890c