import type { Curried } from '../../compositions/curry.js';
import type { Series, SyncSeries } from '../../controls/types.js';
declare function _syncReduce<T, R, I>(input: SyncSeries<T>, reducer: (accumulator: R | I, value: T) => R, initialValue: I): I | R;
declare function _asyncReduce<T, R, I>(input: Series<T>, reducer: (accumulator: Awaited<R | I>, value: Awaited<T>) => R | Promise<R>, initialValue: I | Promise<I>): Promise<Awaited<R> | Awaited<I>>;
export declare function reduceSync<T, R, I>(...args: Parameters<typeof _syncReduce<T, R, I>>): ReturnType<typeof _syncReduce<T, R, I>>;
export declare function reduceSync<T, R, I>(...args: Parameters<Curried<typeof _syncReduce<T, R, I>>>): ReturnType<Curried<typeof _syncReduce<T, R, I>>>;
export declare function reduceAsync<T, R, I>(...args: Parameters<typeof _asyncReduce<T, R, I>>): ReturnType<typeof _asyncReduce<T, R, I>>;
export declare function reduceAsync<T, R, I>(...args: Parameters<Curried<typeof _asyncReduce<T, R, I>>>): ReturnType<Curried<typeof _asyncReduce<T, R, I>>>;
/** Reduce elements into one accumulated value by the specified reducer.  */
export declare namespace reduce {
    const sync: typeof reduceSync;
    const async: typeof reduceAsync;
}
export {};
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