import { NTree } from '../interface';
export declare function findExpandedKeys(prev?: NTree.TKey[], next?: NTree.TKey[]): {
    add: boolean;
    key: NTree.TKey | null;
};
export declare function getExpandRange(shorter: NTree.IFlattenNode[], longer: NTree.IFlattenNode[], key: NTree.TKey): NTree.IFlattenNode[];
