import { Mapper } from '../operators';
/**
 * Creates partitions of an `array` by the key extracted from each item by a function `keyFn`.
 * @param array Array to partition.
 * @param keyFn Function that extracts a key from each item. Default: `identity`.
 */
export declare function partition<T, K>(array: T[], keyFn?: Mapper<T, K>): [K, T[]][];
/**
 * Returns a function that
 * creates partitions of an `array` by the key extracted from each item by a function `keyFn`.
 * @param keyFn Function that extracts a key from each item. Default: `identity`.
 */
export declare function partition<T, K>(keyFn?: Mapper<T, K>): typeof deferred;
/**
 * Creates partitions of an `array` by the key extracted from each item by a previously defined function `keyFn`.
 * @param array Array to partition.
 */
declare function deferred<T, K>(array: T[]): [K, T[]][];
export {};