import type { ArrayPredicate } from '../types.js';
/**
 * Filter an array using a for-loop for maximum performance.
 * Supports type guards for type narrowing.
 *
 * @param arr - Input array
 * @param predicate - Function that returns true/false for each item
 * @returns New filtered array
 */
export declare function filterFast<T, S extends T>(arr: readonly T[], predicate: (item: T, index: number, array: readonly T[]) => item is S): S[];
export declare function filterFast<T>(arr: readonly T[], predicate: ArrayPredicate<T>): T[];
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