import { Observable } from '@legendapp/state';

type UseWindowFocusReturn = Observable<boolean>;
/**
 * Framework-agnostic reactive window focus tracker.
 *
 * Exposes an `Observable<boolean>` that reflects whether the browser window
 * currently has focus. Initial value is synced from `document.hasFocus()` in
 * `onMount` to match SSR output and avoid hydration mismatch. Updates via
 * `focus` / `blur` events on `window`.
 */
declare function createWindowFocus(): UseWindowFocusReturn;

export { type UseWindowFocusReturn, createWindowFocus };