React Query does not work in version 4

The code you provided seems to have some syntax errors and incorrect imports. Here's a corrected version of the code using react-query version 4:

import { useQuery } from 'react-query';

export default function Reddit() {
  const { data: posts, isLoading, isError, error, isSuccess } = useQuery('posts', fetchPosts);

  function fetchPosts() {
    return fetch('https://www.reddit.com/r/aww.json').then(response => response.json());
  }

  return (
    <div>
      <h1>Reddit API</h1>
      {isLoading && <p>Loading...</p>}
      {isSuccess && (
        <ul>
          {posts.data.children.map(post => (
            <li key={post.data.id}>
              <a href={`https://reddit.com${post.data.permalink}`} target="_blank" rel="noreferrer noopener nofollow">
                {post.data.title}
              </a>
            </li>
          ))}
        </ul>
      )}
      {isError && <div>{error.message}</div>}
    </div>
  );
}

Make sure you have installed the correct version of react-query (npm install react-query@4) and imported it correctly (import { useQuery } from 'react-query').