export declare function groupBy<T>(array: T[], iteratee: (item: T) => string): Record<string, T[]>;
export declare function uniq<T>(array: T[]): T[];
export declare function sortBy<T>(arr: T[], getKey: (item: T) => string): T[];
export declare function sumBy<T>(array: T[], iteratee: (item: T) => number): number;