import type { UIMessage } from "ai";
export declare function useMessageWindow(messages: UIMessage[], listRef: React.RefObject<HTMLDivElement | null>, threadKey?: string): {
    windowed: UIMessage<unknown, import("ai").UIDataTypes, import("ai").UITools>[];
    hasOlder: boolean;
    olderCount: number;
    loadOlder: () => void;
    onNearTop: () => void;
};
/** Scroll management for the message list.

    Stick-to-bottom: while the reader is at the end, every content change
    (history load, streamed deltas, tool chips, approvals) keeps the latest
    content in view. The moment the reader scrolls up, the stick releases —
    streaming must never yank them — and it re-arms when they return to the
    bottom on their own. Jump-to-latest: when new content lands while the
    reader is scrolled up, the .fl-newbar pill appears; activating it scrolls
    smoothly to the latest turn and re-sticks. */
export declare function useStickToBottom(messages: UIMessage[], threadKey?: string, contentRevision?: unknown): {
    listRef: import("react").RefObject<HTMLDivElement | null>;
    onScroll: () => void;
    endJump: () => void;
    jumpToLatest: () => void;
    showJump: boolean;
    unseenCount: number;
    snippet: string;
};