TypeScript Version: 3.2.0-dev.20180927

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Code

interface Props {
  text: string;
}

function BackButton(props: Props) {
  return <div/>
}
BackButton.defaultProps = {
  text: 'Go Back',
};
let a = <BackButton /> // error: text is missing in type {}

It works ok with React.Component. Also I tried to make LibraryManagedAttributes<C,P>={c: string} . This changed checking for Component, but not for SFC.