// WARNING! async function must not be passed directly!//useEffect(async () => {// const response = await fetch(`https://www.reddit.com/r/${subreddit}.json`);// const json = await response.json();//…//}, []);React.useEffect(() => { let ignore = false; async function fetchProduct() { const response = await fetch('http://myapi/product/' + productId); const json = await response.json(); if (!ignore) setProduct(json); } fetchProduct(); return () => { ignore = true };}, [productId]);