he/him 
Does @babeljs polyfill or transpile generators? I expect there's a perf hit for the later.
/cc @dan_abramov @sebmck
@theunfocused @xzyfer @babeljs @dan_abramov Perf hit is negligible. Just compiles into a state machine that regeneratorRuntime handles.
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@sebmck@theunfocused@babeljs@dan_abramov thanks for the clarification.Thanks. Twitter will use this to make your timeline better. UndoUndo
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