[algesten]

I'm one of those people that still use coffeescript (if I'm going to transpile anyway, I'd rather use a language I like).

I use coffeescript classes as components without any problem and that inserts an "extends" function into every compiled .js-file that has a class.

I suspect people that need ES5/ES6 compatibility that currently rely on React.createClass as a peer dependency can switch to maintaining their own createClass function local to the project. Suboptimal, but not a lot of code.