import { type RefObject } from 'react';
import type { TableVirtualizerInstance } from '../../TableContext/types';
interface UsePrependScrollAnchorOptions {
    mode: 'container' | 'window';
    scrollRef?: RefObject<HTMLElement | null>;
    rows: {
        id: string;
    }[];
    /** Preferred delta source: virtual-list offsets are immune to unrelated layout growth. */
    virtualizerRef?: RefObject<TableVirtualizerInstance | null>;
    /** Scopes the start-loader measurement to this table's body. */
    tbodyRef?: RefObject<HTMLTableSectionElement | null>;
}
/**
 * Keeps the viewport stable across a prepend, in a layout effect (pre-paint, no
 * flicker). Delta = how far the previously-first row moved down the virtual list
 * (`start` offset) — immune to unrelated page-height changes, unlike a
 * scrollHeight diff, which matters in `window` mode. Falls back to scrollHeight
 * when there's no virtualizer.
 *
 * Start-edge skeletons (`isLoadingPrevious`) sit above the rows but outside the
 * virtual list, so the offset delta can't see them; their height is tracked per
 * commit (hence no dep array) and its collapse joins the delta when the prepend
 * lands in the same commit.
 */
export declare const usePrependScrollAnchor: ({ mode, scrollRef, rows, virtualizerRef, tbodyRef, }: UsePrependScrollAnchorOptions) => void;
export {};