compact selector

selector.js

/**
 * returns a static (not live) NodeList representing a list of the document's elements that match the specified group of selectors. 
 * @param {string} selector 
 * @param {Element} [document] base 
 * @returns {(NodeList|Element|null)}
 */
const $ = (selector, base = document) => {
	let elements = base.querySelectorAll(selector);
	return (elements.length == 0) ? null : (elements.length == 1) ? elements[0] : elements;
}