interface StyleObject {
    [key: string]: any;
}
type BorderEdge = {
    style?: string;
    color?: Record<string, any>;
} | undefined;
/**
 * Borders collected from the perimeter of a merge range.
 * Stored as flat arrays indexed by row/column offset for O(1) lookup.
 */
export interface CollectedBorders {
    /** top edge border for each column (index = col - left) */
    topEdges: BorderEdge[];
    /** bottom edge border for each column (index = col - left) */
    bottomEdges: BorderEdge[];
    /** left edge border for each row (index = row - top) */
    leftEdges: BorderEdge[];
    /** right edge border for each row (index = row - top) */
    rightEdges: BorderEdge[];
    diagonal?: any;
    color?: any;
}
/**
 * Collect perimeter borders from cells before a merge is applied.
 * Must be called BEFORE cell.merge() overwrites slave styles.
 *
 * Only iterates the four edges of the range, not the full rectangle.
 * For perimeter edges where the cell has no border, falls back to the master's border.
 */
export declare function collectMergeBorders(top: number, left: number, bottom: number, right: number, findCell: (r: number, c: number) => {
    style: StyleObject;
} | undefined): CollectedBorders | undefined;
/**
 * Apply position-aware borders to a merged cell range.
 * Must be called AFTER cell.merge() so that the master style is available.
 *
 * Each cell receives a deep-copied style from the master so that
 * later mutations to one cell do not leak to others.
 */
export declare function applyMergeBorders(top: number, left: number, bottom: number, right: number, collected: CollectedBorders, getCell: (r: number, c: number) => {
    style: StyleObject;
}): void;
export {};