jsdoc type guards for dom elements

elements.js

/**
 * @template {keyof HTMLElementTagNameMap} T
 * @param {any} el
 * @param {T} elName
 * @returns {el is HTMLElementTagNameMap[T]}
 */
function isElement(el, elName) {
	return el?.constructor?.name === elName;
}

/**
 * @param {any} el
 * @returns {el is HTMLElement}
 */
function isHTMLElement(el) {
	const name = el?.constructor?.name;

	if (!name) {
		return false;
	}

	if (name === "HTMLElement") {
		return true;
	}

	return isHTMLElement(Object.getPrototypeOf(el));
}