<pre class="shiki github-dark shaku"><code>import React from 'react';import {useEffect, useRef, useCallback} from 'react';export function useIsMounted(): () =&gt; boolean { const ref = useRef(false); useEffect(()=&gt; { ref.current = true; return ()=&gt; { ref.current = false; } }, []) const isMounted = useCallback(()=&gt; ref.current,[]); return isMounted;}// to try your code on the right panel// export App() component like below// export function App() {<div class="shaku-underline shaku-underline-dotted" style="left:5ch">...</div>// return &lt;div&gt;BFE.dev&lt;/div&gt;// }</code></pre>

useCallback + useEffect + useRef

When we handle async requests in React, we need to pay attention if the component is already unmounted. Please implement useIsMounted() for us to easi…