SDKs/React/HooksuseFlagsterRetrieve Flagster instanceUsage import { useFlagster } from 'flagster-react'; const MyComponent = () => { const flagster = useFlagster(); useEffect(() => { return flagster.onChange((oldFlags, newFlags) => { console.log('Flags updated', newFlags); }); }, [flagster]); return ( <div></div> ); };PrevioususeFlagsNextNextJs and SSR