import { type Iteratee } from '../internal/iteratee.js';
import type { MapKeySelector } from '../types.js';
/**
 * Group array items by a key selector.
 * Returns a Map by default (better for non-string keys).
 *
 * @param arr - Input array
 * @param iteratee - Function or property path string that returns a key for each item
 * @returns Map of key to array of items
 *
 * @example
 * groupByHot(users, 'department')
 * groupByHot(users, user => user.role)
 */
export declare function groupByHot<T, K>(arr: readonly T[], iteratee: Iteratee<T, K> | MapKeySelector<T, K>): Map<K, T[]>;
/**
 * Group array items by a key selector.
 * Returns a plain object when asObject is true.
 *
 * @param arr - Input array
 * @param iteratee - Function or property path string that returns a key for each item
 * @param asObject - When true, returns a plain object instead of Map
 * @returns Object of key to array of items
 *
 * @example
 * groupByHot(users, 'department', true)
 */
export declare function groupByHot<T, K extends PropertyKey>(arr: readonly T[], iteratee: Iteratee<T, K>, asObject: true): Record<K, T[]>;
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