/**
 * Here we try to detect whether a visitor uses their keyboard to interact with the page.
 *
 * We consider it a keyboard interaction when:
 *
 * - We detect a Tab keyboard event.
 * - We detect an Enter keyboard event.
 * - We detect a Space keyboard event.
 *
 * We remove the "keyboard interaction flag" on click events.
 *
 * @throws Throws if `window` is not defined.
 */
export declare function addListener(): void;
/**
 * Removes the global keyboard even listener.
 *
 * You most likely won't need this outside of testing.
 *
 * @throws Throws if `window` is not defined.
 */
export declare function removeListener(): void;