/**
 * Generates a random subset of an array.
 *
 * @template T - The type of elements in the array.
 * @param array - The source array.
 * @param minSize - Minimum size of the subset (default: 1).
 * @param maxSize - Maximum size of the subset (default: array.length).
 * @param allowDuplicates - Whether to allow duplicate elements (default: false).
 * @returns A random subset of the array.
 *
 * @throws {Error} If array is empty or size constraints are invalid.
 *
 * @example
 * // Random subset of 2-4 elements
 * randomSubset([1, 2, 3, 4, 5], 2, 4); // [3, 1, 5]
 *
 * @example
 * // Any size subset (1 to array.length)
 * randomSubset(['a', 'b', 'c', 'd']); // ['b', 'd']
 *
 * @example
 * // With duplicates
 * randomSubset([1, 2, 3], 2, 5, true); // [2, 1, 2, 3]
 *
 * @complexity Time: O(n), Space: O(n) where n is subset size
 */
export declare function randomSubset<T>(array: T[], minSize?: number, maxSize?: number, allowDuplicates?: boolean): T[];
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