USB barcode scanning code in javascript

barcode.js

let scan = ''
const lang = window.localStorage.getItem('lang', 'ru')
window.addEventListener('keydown', function(e) {
	if (e.key === 'Enter') {
        if (document.querySelector('#id_barcode')) {
            document.querySelector('#id_barcode').value = scan
            document.querySelector('#id_barcode').dispatchEvent(new Event('input'))
            scan = ''
        } else if (window.location.pathname === window.localStorage.getItem('url_main')) {
            addCard(`/${lang}/pos/add-to-card/barcode/${scan}/`)
            scan = ''
        }
    } else if (e.target.tagName === 'INPUT') {
        scan = ''
    } else {
        scan += e.key
    }
})