import React from 'react';

type Callback = () => any;

const useInterval = (callback: Callback, delay: number) => {
  const savedCallback = React.useRef<Callback>();

  React.useEffect(() => {
    savedCallback.current = callback;
  }, [callback]);

  // eslint-disable-next-line consistent-return
  React.useEffect(() => {
    const tick = () => {
      if (savedCallback.current) savedCallback.current();
    };

    if (delay !== null) {
      const id = setInterval(tick, delay);
      return () => clearInterval(id);
    }
  }, [delay]);
};

export default useInterval;