import { type RefObject } from 'react';
interface Message {
    id: string;
    atMillis: number;
}
/** Read only committed, visible messages. Background fetches and hidden filters never acknowledge. */
export declare function useNotificationVisibleRead<T extends Message>(rootRef: RefObject<HTMLDivElement>, items: readonly T[], enabled: boolean, acknowledge: (items: readonly T[], signal: AbortSignal) => Promise<void>, contextKey: string): void;
/** Keep a message anchor while history is prepended; follow incoming messages only at the bottom. */
export declare function useNotificationScroll(rootRef: RefObject<HTMLDivElement>, items: readonly Message[], viewKey: string): {
    newMessages: number;
    toLatest: () => void;
    onScroll: () => void;
};
export {};
//# sourceMappingURL=use-notification-viewport.d.ts.map