JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test1"><img src="img.jpg" /></div>
<div id="test2">Hello</div>

JavaScript

function hasImage(id) {
    var childElements = document.getElementById(id).childNodes;
    for (var i = 0; i < childElements.length; i++) {
    if (childElements[i].localName != null && childElements[i].localName.toLowerCase() == "img") {
            return true;
        }
    }
    return false;
}

alert(hasImage('test1'));
alert(hasImage('test2'));