+ Remove duplicated await
+ Replace some legacy codes with ES6
+ Fix some of eslint problems

* Export creation date in dumped content

* date_creation -> dateCreated
Co-authored-by: Joris Langlois <joris.langlois@knplabs.com>

* updating a switch into object literal and fixed a couple linter errors

* added a comment about weird formatting

* style: use lodash get

* fix: pass eslint + puglint + jest