/**
 * Set the opacity of an element.
 *
 * @param elem - The element whose opacity to set.
 * @param opacity - The opacity value to set.
 *
 * @example
 * const el = document.createElement('div')
 * setOpacity(el, 0.5)
 * console.log(el.style.opacity)
 *
 * @since 1.0.0
 */
declare const setOpacity: (elem: HTMLElement | any, opacity: number) => void;
export default setOpacity;