Preset Polymer 2 and Polymer 2 + Typescript deprecated?

I just tried creating a ‘front’ module in my Cuba project.

A dialog window then popups up and asks to ‘Select Preset’.
I see options:

  • React
  • Polymer 2 (deprecated)
  • Polymer 2 + Typescript (deprecated)

Why is Polymer deprecated ? Does this mean that it will soon be unsupported ?

What do I do if I want to build Polymer UI frontend ?