import type { Readable } from "svelte/store";
import type { ConfigurableWindow } from "../_configurable";
/**
 * Reactively track window focus with `window.onfocus` and `window.onblur`.
 *
 * @param options
 */
export declare function window_focus({ window, }?: ConfigurableWindow): Readable<boolean>;
export { window_focus as windowFocus };