/**
 * Picks a random element from an array based on weights.
 *
 * @template T - The type of array elements.
 * @param items - The array of items to pick from.
 * @param weights - The array of weights (positive numbers) corresponding to each item.
 * @returns A randomly selected item based on weights.
 *
 * @throws {Error} If items array is empty.
 * @throws {Error} If weights array is empty.
 * @throws {Error} If items and weights arrays have different lengths.
 * @throws {Error} If any weight is not a positive number.
 * @throws {Error} If any weight is NaN.
 * @throws {Error} If sum of weights is zero.
 *
 * @example
 * // Pick with equal weights
 * randomWeighted(['a', 'b', 'c'], [1, 1, 1]); // 'b'
 *
 * @example
 * // Pick with unequal weights (75% chance of 'common', 25% chance of 'rare')
 * randomWeighted(['common', 'rare'], [3, 1]); // 'common'
 *
 * @example
 * // Pick rarity level
 * randomWeighted(['common', 'uncommon', 'rare', 'legendary'], [50, 30, 15, 5]);
 * // 'uncommon'
 *
 * @note Uses Math.random() for non-cryptographic randomness.
 * @note Higher weight means higher probability of selection.
 * @note Weights don't need to sum to 1 or 100 - they are normalized internally.
 *
 * @complexity Time: O(n), Space: O(1) where n is array length
 */
export declare function randomWeighted<T>(items: T[], weights: number[]): T;
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