User347430248 posted
Hi Asplearning,
I find that jJavaScript version 6 is comes with Visual Studio 2015.
You can try to install the latest version ReSharper and check whether it provide any option to use ES6 in VS 2012.
If it has option to use ES6 then it can solve your issue.
If that does not solves your issue then you can try to install the Visual Studio community 2017.
It will solve your issue.
Reference:
Support for ES6 modules
JavaScript Editor Improvements in Visual Studio 2015
Regards
Deepak