import { useEffect, useRef } from 'react';

function useTimeout(callback: () => void, delay: number) {
  const savedCallback = useRef(callback);

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

  useEffect(() => {
    if (delay === null) return;
    const id = setTimeout(() => savedCallback.current(), delay);
    return () => clearTimeout(id);
  }, [delay]);
}

useTimeout(() => setVisible(false), 3000);

.header {
  position: sticky;
  top: 0;
  background: #fff;
  z-index: 1000;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

const header = document.querySelector('.header');
window.addEventListener('scroll', () => {
  if (window.scrollY > 0) {
    header.classList.add('sticky');
  } else {
    header.classList.remove('sticky');
  }
});

.header.sticky {
  position: fixed;
  top: 0;
  width: 100%;
  background: #fff;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

import { useEffect, useState } from "react";

function useDebounce<T>(value: T, delay: number) {
  const [debounced, setDebounced] = useState(value);

  useEffect(() => {
    const id = setTimeout(() => setDebounced(value), delay);
    return () => clearTimeout(id);
  }, [value, delay]);

  return debounced;
}

const [query, setQuery] = useState("");
const debouncedQuery = useDebounce(query, 500);

useEffect(() => {
  if (debouncedQuery) {
    fetch(`/api/search?q=${debouncedQuery}`);
  }
}, [debouncedQuery]);

import { motion } from 'framer-motion';

const Button: React.FC = () => {
  return (
    <motion.button
      whileHover={{ scale: 1.1 }} // Анимация при наведении курсора
      whileTap={{ scale: 0.9 }} // Анимация при клике
      initial={{ opacity: 0 }} // Начальное состояние
      animate={{ opacity: 1 }} // Конечное состояние
      transition={{ duration: 0.3 }} // Длительность
    >
      Нажми меня
    </motion.button>
  );
};

export default Button;