import type { KeyTypes } from './KeyTypes.js';
export declare function reduceByKey<S extends Record<KeyTypes, any>, T>(subject: S, callbackfn: (previousValue: T, key: keyof S, currentIndex: number, array: string[], subject: S) => T, initialValue: T): T;
/**
 * @deprecated renamed to reduceByKey
 */
export declare const reduceKey: typeof reduceByKey;
//# sourceMappingURL=reduceKey.d.ts.map