export type ColumnGroupShow = "open" | "closed";
export type ColumnGroupMeta = {
    /** Group ids that render a collapse toggle. */
    collapsibleGroupIds: Set<string>;
    /** Group id -> whether it starts expanded (openByDefault). */
    defaultOpen: Map<string, boolean>;
    /** Leaf column id -> the group controlling it + its show mode. */
    leafControl: Map<string, {
        groupId: string;
        show: ColumnGroupShow;
    }>;
};
export declare function computeColumnGroupMeta(columns: ReadonlyArray<any>): ColumnGroupMeta;
/**
 * Which leaf ids are hidden right now, given the set of collapsed group ids.
 * `'open'` leaves hide while their group is collapsed; `'closed'` leaves hide
 * while it is expanded.
 */
export declare function hiddenLeavesForCollapse(meta: ColumnGroupMeta, collapsed: ReadonlySet<string>): Record<string, boolean>;