/**
 * Generates a random hexadecimal string of specified length.
 *
 * @param length - The length of the hex string to generate (number of hex digits).
 * @returns A random hexadecimal string (lowercase).
 *
 * @throws {Error} If length is NaN.
 * @throws {Error} If length is negative or not an integer.
 *
 * @example
 * // Generate 8-character hex string
 * randomHex(8); // 'a3f9c2e1'
 *
 * @example
 * // Generate short hex ID
 * randomHex(6); // '4d82f1'
 *
 * @example
 * // Generate 32-character hex (MD5-like length)
 * randomHex(32); // 'b47c9d1e3a5f2c8b6d4e9f1a7c3b5e2d'
 *
 * @note Uses Math.random() for non-cryptographic randomness.
 * @note For cryptographic randomness, use generateRandomBytes from cryptoFunctions.
 *
 * @complexity Time: O(n), Space: O(n) where n is length
 */
export declare function randomHex(length: number): string;
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