/**
 * Finds the closest parent element of the given element that has the specified attribute set,
 * and returns the value of that attribute.
 *
 * @param {HTMLElement} element - The starting element to search from.
 * @param {string} attribute - The attribute to search for.
 * @returns {string | null} The value of the specified attribute on the closest parent element that has it set, or null if no such parent element is found.
 */
export declare const findParentAttribute: (element: HTMLElement, attribute: string) => string | null;
