Tablet formFactor

I also had a problem with this. I ended up just making my own function for it using getBoundingRect()

import wixWindow from 'wix-window';

export function formFactor() {
       return wixWindow.getBoundingRect()
        .then((windowSizeInfo) => {
            if (windowSizeInfo.window.width < 751) {
                return "Mobile"
            }
            else
                if (windowSizeInfo.window.width < 1001) {
                    return "Tablet"
                }
                else
                    return "Desktop"
        })
}