Codemod to port to es2015 classes?

[gmarty]

Hi, I was wondering if anybody has developed a code mod to port klass classes to es2015 classes.

AFAICT, the semantic of klass matches the one of es2015 classes. So writing such a code mod shouldn't be too hard (with potential corner cases).
It would be nice to have an automated way to move code to new standard.