import type { PositionGridCell, PositionUnion } from "../../types.js";
import type { DataRect } from "../types.js";
/**
 * Expands the last selection rect downward by one row step from the focused
 * cell position. When `meta` is true the rect jumps directly to the last row.
 * Span roots are respected so the rect always aligns to full cell extents.
 * Returns the updated selections array, or null if no expansion is possible.
 */
export declare function expandRectsDown(scrollIntoView: (params: {
    row?: number;
    column?: number;
}) => void, cellRoot: (row: number, column: number) => PositionUnion | null, selections: DataRect[], meta: boolean, position: PositionGridCell, rowCount: number): DataRect[] | null;