/**
 * Reactive page visibility store — tab active vs hidden.
 *
 * Uses the Page Visibility API (`document.visibilityState`).
 *
 * @example
 * ```ts
 * import { pageVisibility } from '@r2digisolutions/components';
 * if (pageVisibility.visible) { poll(); }
 * ```
 */
export type VisibilityState = 'visible' | 'hidden';
declare class PageVisibilityStore {
    #private;
    constructor();
    get state(): VisibilityState;
    get visible(): boolean;
    get hidden(): boolean;
    get forced(): VisibilityState | null;
    setForced(value: VisibilityState | null): void;
    get effective(): VisibilityState;
    get isVisible(): boolean;
    get isHidden(): boolean;
}
export declare const pageVisibility: PageVisibilityStore;
export {};