export type TGetIndexOfElArgs = Parameters<typeof getIndexOfEl>;
export type TGetIndexOfElReturn = ReturnType<typeof getIndexOfEl>;
/**
 * Gets index of Node from relatively its siblings
 * @param el{HTMLElement|Node|Element|Document} DOM element
 * @returns {number}
 * @throws {TypeError} getIndexOfEl: el must be a Node/Element
 * @example
 * // <ul>
 * //  <li id="a">A</li>
 * //  Text node
 * //  <li id="b">B</li>
 * //  <li id="c">C</li>
 * // </ul>
 * getIndexOfEl(document.querySelector("#c")!) // 2
 * @example
 * // Find the index of a clicked tab among its element siblings
 * tabs.addEventListener("click", (event) => {
 *   if (event.target instanceof Element) selectTab(getIndexOfEl(event.target));
 * });
 */
export declare const getIndexOfEl: (el: HTMLElement | Node | Element | Document) => number;