It uses babel, so it uses regenerator ( https://github.com/facebook/regenerator https://github.com/facebook/regenerator ) and then uglify probably. It will be

It uses babel, so it uses regenerator ( https://github.com/facebook/regenerator https://github.com/facebook/regenerator ) and then uglify probably. It will be great when typescript can do it natively because it knows at lot more before the being translated to javascript : https://github.com/Microsoft/TypeScript/issues/8 https://github.com/Microsoft/TypeScript/issues/8