A custom React Hook for tracking the window width and to get the current viewport.

use-viewport.js

// hooks/use-viewport.js
import { useState, useEffect } from 'react'

export const MOBILE = 'MOBILE'
export const TABLET = 'TABLET'
export const DESKTOP = 'DESKTOP'

const getDevice = width => {
  if (width < 768) return MOBILE
  else if (width < 992) return TABLET
  else return DESKTOP
}

export function useViewport() {
  const [viewport, setViewport] = useState({
    width: window.innerWidth,
    device: getDevice(window.innerWidth)
  })

  useEffect(() => {
    const handleResize = () =>
      setViewport({
        width: window.innerWidth,
        device: getDevice(window.innerWidth)
      })
    window.addEventListener('resize', handleResize)
    return () => {
      window.removeEventListener('resize', handleResize)
    }
  }, [])

  return { viewport }
}