export {};
declare global {
    type SortDirection = 'ASC' | 'DESC';
    interface GroupItem<TKey, T> {
        key: TKey;
        values: T[];
    }
    interface Array<T> {
        take(count: number, skip?: number): Array<T>;
        add(...items: T[]): Array<T>;
        removeBy(predicate: (value: T) => boolean): Array<T>;
        sumBy(fn: (value: T, index: number) => number, initialValue?: number): number;
        sortBy<TVal>(fn: (value: T) => TVal, direction?: 'ASC' | 'DESC'): Array<T>;
        maxBy(fn: (value: T) => number): number;
        findOrThrow(predicate: (value: T) => boolean): T;
        toRecord<K extends string | number | symbol, V>(fn: (value: T) => [K, V]): Record<K, V>;
        groupBy<TKey extends string | number | symbol>(keySelector: (item: T, index: number) => TKey): GroupItem<TKey, T>[];
    }
}