import { type Iteratee } from '../internal/iteratee.js';
/**
 * Remove duplicates from an array based on a key selector.
 * Keeps the first occurrence of each unique key.
 *
 * @param arr - Input array
 * @param iteratee - Function or property path string that returns a key for each item
 * @returns New array with duplicates removed
 *
 * @example
 * // Using function
 * uniqueByKeyHot(users, user => user.id)
 *
 * @example
 * // Using property shorthand
 * uniqueByKeyHot(users, 'id')
 *
 * @example
 * // Using deep path
 * uniqueByKeyHot(users, 'profile.email')
 */
export declare function uniqueByKeyHot<T, K extends PropertyKey>(arr: readonly T[], iteratee: Iteratee<T, K>): T[];
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