useScreenSize React Hook

import { useState, useEffect } from 'react';

const MOBILE_CUTOFF = 420; // largest mobile screen width
const DESKTOP_CUTOFF = 1024; // smallest desktop screen width

const DEFAULT_SIZE = { width: 1024, height: 1000 };

function getWindowDimensions() {
  if (typeof window !== 'undefined') {
    const { innerWidth: width, innerHeight: height } = window;
    return {
      width,
      height,
    };
  } else {
    return DEFAULT_SIZE;
  }
}

export default function useWindowDimensions() {
  const [windowDimensions, setWindowDimensions] = useState(getWindowDimensions());

  useEffect(() => {
    function handleResize() {
      setWindowDimensions(getWindowDimensions());
    }

    window.addEventListener('resize', handleResize);
    return () => window.removeEventListener('resize', handleResize);
  }, []);

  return {
    ...windowDimensions,
    isDesktop: windowDimensions.width >= DESKTOP_CUTOFF,
    isMobile: windowDimensions.width < MOBILE_CUTOFF,
  };
}
tsx

Usage

import useWindowDimensions from './useWindowDimensions';

const Header: React.FC<HeaderProps> = (props) => {
  const { isDesktop, isMobile } = useWindowDimensions();

  return (
    <div style={{ width: isDesktop ? '400px' : '100%' }}>
      <p style={{ fontSize: isMobile ? 12 : 14 }}>Here's some text</p>
    </div>
  );
};
tsx