chameleon/viewer/frontend/src/components/util/useInterval.ts

/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the Chameleon License found in the
* LICENSE file in the root directory of this source tree.
*/

import { useEffect, useRef } from "react";

export function useInterval(callback, delay) {
  const savedCallback = useRef<() => void>();

  // Remember the latest callback.
  useEffect(() => {
    savedCallback.current = callback;
  }, [callback]);

  // Set up the interval.
  useEffect(() => {
    function tick() {
      if (savedCallback && savedCallback.current) {
        savedCallback.current();
      }
    }
    if (delay !== null) {
      const id = setInterval(tick, delay);
      return () => clearInterval(id);
    }
  }, [delay]);
}