utils.js

module.exports = {
    createUUID: () => {
        let dt = new Date().getTime();
        const uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
            const r = (dt + Math.random()*16)%16 | 0;
            dt = Math.floor(dt/16);
            return (c==='x' ? r :(r&0x3|0x8)).toString(16);
        });

        return uuid;
    }
};