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Re:React on ES6+ by dubcanada on Wednesday July 08, 2015 @08:35AM (#9851119)
Atom does I believe, but their build tool is really complicated.
Re:React on ES6+ by ssorallen on Wednesday July 08, 2015 @12:56PM (#9852987)
Atom uses CoffeeScript, but Nuclide[0], Facebook's suite of packages for Atom, uses ES6/7 (including async/await) via Babel. The transpilation and caching of transpiled sources is done in the nuclide-node-transpiler[1] package.

[0] https://github.com/facebook/nuclide

[1] https://github.com/facebook/nuclide/tree/master/pkg/nuclide/...