examples/virtualized-rows/src/scrollbarWidth.js

const scrollbarWidth = () => {
    // thanks too https://davidwalsh.name/detect-scrollbar-width
    const scrollDiv = document.createElement('div')
    scrollDiv.setAttribute('style', 'width: 100px; height: 100px; overflow: scroll; position:absolute; top:-9999px;')
    document.body.appendChild(scrollDiv)
    const scrollbarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth
    document.body.removeChild(scrollDiv)
    return scrollbarWidth
}
  
export default scrollbarWidth