We are using ES6 as JS Code standarization, for more about ES6 please follow this link http://es6-features.org/. We understand that developers have the characteristics to use tabs or spaces, so make sure to install config editor in their editor / idea so that all code is uniform and easy for next fix.
Before pulling the request, make sure all the code runs well in the unit tests, and make sure the code does the process as efficiently as possible.