export function uuid() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
        const r = (Math.random() * 16) | 0;
        const v = c == 'x' ? r : (r & 0x3) | 0x8;

        return v.toString(16);
    });
}