/**
 * Patches an element's focus and blur methods to emit events consistently and predictably in tests.
 * This is necessary, because some browsers, like IE11, will call the focus handlers asynchronously,
 * while others won't fire them at all if the browser window is not focused.
 *
 * patchElementFocus(triggerEl);
 */
export declare function patchElementFocus(element: HTMLElement): void;