Currently lebab is doing so much from parsing to generating code. During the process, somethings are missing (Like nice warnings while parsing the code #136 or JSX Support #130) or even some bugs show up. I believe almost all of these issues have been considered and solved in babel.

Lebab's aim is basically transforming an old code to a modern code. That means the only thing that matters in lebab is transforming. So, making a babel transformer instead of re-implementing all that stuff can be an option for the future releases.