export declare class Reducers {
    static SUM: (accumulator: number, currentValue: number) => number;
    static MIN: (accumulator: number, currentValue: number) => number;
    static MAX: (accumulator: number, currentValue: number) => number;
    static FIRST: <T>(previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T;
    static LAST: <T>(previousValue: T, currentValue: T) => T;
    static FLAT: <T>(accumulator: readonly T[], currentValue: readonly T[], currentIndex: number) => T[];
}