CODE EXAMPLE FOR JAVASCRIPT

Warning: Internal React error: Expected static flag was missing. Please notify the React team.

//If condition must be after useEffet()
// error
const C = () =>  {
    if (condition) return null;
    useEffect(() => {/*...*/}, []);
    return <div></div>
}

//no error
const C = () =>  {
    useEffect(() => {/*...*/}, []);
    if (condition) return null;
    return <div></div>
}