/**
 * Queries the document/element for any elements matching the given selector, and returns an array.
 *
 * @param   {Element} [el] Restrict the search to the contents of the given DOMElement
 * @param   {string} selector
 * @param   {Predicate} [predicate] Optional predicate function to transform the found elements.
 *
 * @returns {Array}
 * @category DOM
 */
export function qsa(el?: Element, selector: string, predicate?: Predicate): any[];
/**
 * Returns true of the provided DOMElement has the given classname
 *
 * @param   {Element}  el
 * @param   {string}  className
 *
 * @returns {boolean}
 * @category DOM
 */
export function hasClassName(el: Element, className: string): boolean;
/**
 * Adds the given classname to the provided DOMElement
 *
 * @param {Element} el
 * @param {string} className
 * @category DOM
 */
export function addClassName(el: Element, className: string): void;
/**
 * Removes the given classname to the provided DOMElement, if it exists
 *
 * @param {Element} el
 * @param {string} className
 * @category DOM
 */
export function removeClassName(el: Element, className: string): void;