airbnb/caravel

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
import { useEffect, useRef } from 'react';

/*
 * Functional components and setTimeout with useState do not play well
 * and the setTimeout callback typically has stale state from a closure
 * The useInterval function solves this issue.
 * more info: https://overreacted.io/making-setinterval-declarative-with-react-hooks/
 */
function useInterval(callback: Function, delay: number | null): void {
  const savedCallback = useRef<Function>(callback);
  // Remember the latest function.
  useEffect(() => {
    savedCallback.current = callback;
  }, [callback]);

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

export default useInterval;