import type { EqualityPredicate } from '../types.js';
/**
 * Remove duplicates from an array based on an equality predicate.
 * Keeps the first occurrence of each unique item.
 * O(n^2) complexity - use uniqueByKeyFast when possible.
 *
 * @param arr - Input array
 * @param predicate - Function that returns true if two items are equal
 * @returns New array with duplicates removed
 */
export declare function uniqueByPredicateFast<T>(arr: readonly T[], predicate: EqualityPredicate<T>): T[];
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