/**
 * A node in the group tree built by a CollectionView. A group either holds child
 * groups (when more than one grouping level is active) or sits at the bottom
 * level over its own leaf items. `items` always holds every leaf beneath the
 * group in view order, so aggregates and counts read straight from it.
 */
export declare class CollectionViewGroup<T = Record<string, unknown>> {
    /** Display text for the group key, e.g. the country name. */
    readonly name: string;
    /** Raw group key before formatting. */
    readonly key: unknown;
    readonly level: number;
    /** Every leaf under this group, in view order. */
    readonly items: T[];
    readonly groups: CollectionViewGroup<T>[];
    constructor(
    /** Display text for the group key, e.g. the country name. */
    name: string, 
    /** Raw group key before formatting. */
    key: unknown, level: number, 
    /** Every leaf under this group, in view order. */
    items?: T[]);
    get isBottomLevel(): boolean;
    get itemCount(): number;
}