/**
 * Selects a random sample of elements from an array without replacement.
 *
 * @template T - The type of array elements.
 * @param array - The array to sample from.
 * @param count - The number of elements to sample.
 * @returns An array of randomly selected elements (without duplicates).
 *
 * @throws {Error} If array is empty.
 * @throws {Error} If count is NaN.
 * @throws {Error} If count is negative or not an integer.
 * @throws {Error} If count is greater than array length.
 *
 * @example
 * // Pick 3 random numbers
 * randomSample([1, 2, 3, 4, 5], 3); // [2, 5, 1]
 *
 * @example
 * // Pick random cards
 * randomSample(['♠', '♣', '♥', '♦'], 2); // ['♥', '♠']
 *
 * @example
 * // Pick all elements (shuffled)
 * randomSample([1, 2, 3], 3); // [3, 1, 2]
 *
 * @note Uses Fisher-Yates shuffle algorithm for unbiased sampling.
 * @note Does not modify the original array.
 * @note Elements in result maintain relative order from original array.
 *
 * @complexity Time: O(n), Space: O(n) where n is count
 */
export declare function randomSample<T>(array: T[], count: number): T[];
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