let size ; export default function scrollbarSize ( recalc ? ) { if ( ( ! size && size !== 0 ) || recalc ) { const scrollDiv = document . createElement ( 'div' ) ; scrollDiv . style . position = 'absolute' ; scrollDiv . style . top = '-9999px' ; scrollDiv . style . width = '50px' ; scrollDiv . style . height = '50px' ; scrollDiv . style . overflow = 'scroll' ; document . body . appendChild ( scrollDiv ) ; size = scrollDiv . offsetWidth - scrollDiv . clientWidth ; document . body . removeChild ( scrollDiv ) ; } return size ; }