/**
 * Generates a random sequence of characters from a given alphabet.
 *
 * @param length - The length of the sequence to generate.
 * @param alphabet - The alphabet to use (default: alphanumeric).
 * @returns A random sequence of the specified length.
 *
 * @throws {Error} If length is NaN.
 * @throws {Error} If length is negative or not an integer.
 * @throws {Error} If alphabet is empty.
 *
 * @example
 * // Generate random alphanumeric sequence
 * randomSequence(8); // 'a3F9kL2p'
 *
 * @example
 * // Generate random numeric code
 * randomSequence(6, '0123456789'); // '482719'
 *
 * @example
 * // Generate random uppercase letters
 * randomSequence(4, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'); // 'HQWZ'
 *
 * @note Uses Math.random() for non-cryptographic randomness.
 * @note For cryptographic randomness, use generateRandomString from cryptoFunctions.
 *
 * @complexity Time: O(n), Space: O(n) where n is length
 */
export declare function randomSequence(length: number, alphabet?: string): string;
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