export declare const chunk: <T>(items: readonly T[], chunkSize?: number) => any[];
export declare function getEveryN<T>(items: readonly T[], n: number): any[] | readonly T[];
export declare const uniq: <T>(items: readonly T[]) => T[];
export declare const uniqBy: <T>(items: readonly T[], predicate: any) => any[];
export declare const flatten: <T>(items: readonly T[]) => (T extends readonly (infer InnerArr)[] ? InnerArr : T)[];
export declare const sum: (items: readonly number[]) => number;