// Theme context, default to light theme // highlight-next-line const ThemeContext = React.createContext('light'); // Signed-in user context // highlight-next-line const UserContext = React.createContext(); class App extends React.Component { static propTypes = { theme: PropTypes.string, signedInUser: PropTypes.shape({ id: number, name: string, avatar: string, }), }; render() { // highlight-range{9} return ( {theme => ( {user => ( )} )} ); } }