import ColumnDef, { Accessor } from "../types/ColumnDef";
/**
 * Find the parent header that contains the given child header
 * Optimized using flattenAllHeaders for better performance
 */
export declare const findParentHeader: (headers: ColumnDef[], childAccessor: Accessor) => ColumnDef | null;
/**
 * Check if a header should be hidden based on its parent's collapsed state
 */
export declare const shouldHideWhenParentCollapsed: (header: ColumnDef, headers: ColumnDef[], collapsedHeaders: Set<Accessor>) => boolean;
/**
 * Get all child headers of a parent header (recursively)
 * Uses flattenAllHeaders for consistency and better performance
 */
export declare const getAllChildHeaders: (header: ColumnDef) => ColumnDef[];
/**
 * Check if a header has collapsible children
 */
export declare const hasCollapsibleChildren: (header: ColumnDef) => boolean;
/**
 * Number of visible leaf (bottom-level) columns a header spans, for
 * `aria-colspan` on grouped/nested header cells. Leaf headers excluded from
 * layout (`hide` / `excludeFromRender`) or suppressed by their parent's
 * collapsed state are omitted so the announced span matches the columns
 * actually rendered. Leaf headers return 1.
 */
export declare const getHeaderColspan: (header: ColumnDef, rootHeaders: ColumnDef[], collapsedHeaders: Set<Accessor>) => number;
/**
 * Get all leaf (bottom-level) headers that should be visible when a parent is collapsed
 * Uses flattenHeaders for consistent leaf detection
 */
export declare const getVisibleLeafHeadersWhenCollapsed: (header: ColumnDef) => ColumnDef[];