JavaScript How to understand js code for plugins?

[developpersoft]

Hi There,

I have problem to understand javascript code in plugins I don't know how this works all the elements symbolized without using document.getElementById to add an HTML Elements or change it But in plugins I only find The code Like this :

var ap = Object.defineProperty;
var lp = (o,e,t)=>e in o ? ap(o, e, {
    enumerable: !0,
    configurable: !0,
    writable: !0,
    value: t
}) : o[e] = t;
var he = (o,e,t)=>(lp(o, typeof e != "symbol" ? e + "" : e, t),
t);
(function() {
    const e = document.createElement("link").relList;
    if (e && e.supports && e.supports("modulepreload"))
        return;
    for (const i of document.querySelectorAll('link[rel="modulepreload"]'))
        n(i);
    new MutationObserver(i=>{
        for (const s of i)
            if (s.type === "childList")
                for (const r of s.addedNodes)
                    r.tagName === "LINK" && r.rel === "modulepreload" && n(r)
    }
    ).observe(document, {
        childList: !0,
        subtree: !0
    });
    function t(i) {
        const s = {};
        return i.integrity && (s.integrity = i.integrity),
        i.referrerPolicy && (s.referrerPolicy = i.referrerPolicy),
        i.crossOrigin === "use-credentials" ? s.credentials = "include" : i.crossOrigin === "anonymous" ? s.credentials = "omit" : s.credentials = "same-origin",
        s
    }
    function n(i) {
        if (i.ep)
            return;
        i.ep = !0;
        const s = t(i);
        fetch(i.href, s)
    }
}
)();
/**

 

[cli345]

It looks like a polyfill for browsers that don't support "modulepreload".