export declare const getGroupKey: (lvl: unknown) => string;
export declare function normalizeTreeToArray(keys: string[], treeLeafKey: string, obj: Record<string, any>): Record<string, any>[];
export declare function flatten(input: any[]): any[];
export declare function group(values: Record<string, any>[], grp: string, keys: string[], treeLeafKey: string, mainGrp?: string, mainValue?: any, groups?: string[], allGroups?: string[], groupIndex?: number): Record<string, any>[];
export declare function index(values: any[], key: string): string;
export declare function sort(values: any[], key?: string): void;
export declare function sum(values: any[], key?: string): number;
export declare function requireVersion(pkg: string, min: string, ver: string, strict?: boolean): boolean;