1  import { useEffect, useRef } from 'react'
 2  
 3  /**
 4   * A custom hook that runs a callback at a specified interval.
 5   * The interval is cleared when the component unmounts.
 6   * The interval is also cleared and restarted if the delay changes.
 7   */
 8  export function useInterval(callback: () => void, delay: number): void {
 9    const savedCallback = useRef(callback)
10  
11    // Remember the latest callback
12    useEffect(() => {
13      savedCallback.current = callback
14    }, [callback])
15  
16    // Set up the interval
17    useEffect(() => {
18      function tick() {
19        savedCallback.current()
20      }
21  
22      const id = setInterval(tick, delay)
23      return () => clearInterval(id)
24    }, [delay])
25  }