he/him 
JS type systems have a long way to go to achieve good error messages.pic.twitter.com/CNTA2VUWCI
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fwiw, here's
@flowtype (updated, i made an error before)pic.twitter.com/buDZQlEGdT
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Yeah, it'd be interesting to compare both for error readability. And generally see how they can both be improved.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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