import { Reducer } from '../operators';
/**
 * Reduces an `array` to an accumulated form according to a function `reduceFn`.
 * @param array Array to reduce.
 * @param reduceFn A function that accumulates members.
 * @param initialValue Accumulator initial value.
 */
export declare function reduce<T, R>(array: T[], reduceFn: Reducer<T, R>, initialValue: R): R;
/**
 * Returns a function that
 * reduces an `array` to an accumulated form according to a function `reduceFn`.
 * @param reduceFn A function that accumulates members.
 * @param initialValue Accumulator initial value.
 */
export declare function reduce<T, R>(reduceFn: Reducer<T, R>, initialValue: R): typeof deferred;
/**
 * Reduces an `array` to an accumulated form according to a previously specified function `reduceFn`.
 * @param array Array to reduce.
 */
declare function deferred<T, R>(array: T[]): R;
export {};