Refactor .coffee files to .js, ES6

[Bnaya]

Refactor files written in coffeescript to ES6.
Make sure nothing breaks!
https://github.com/decaffeinate/decaffeinate can help you.
And remember our code style rules

[ManjulMittal]

I want to work on this issue can you assign this to me and the project is not getting setup on my machine please help me with that