Generate UUID in vanilla JS via https://www.w3resource.com/javascript-exercises/javascript-math-exercise-23.php

createUUID.js

function createUUID(){
   
    let dt = new Date().getTime()
    
    const uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(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
}