/**
 * Retrieves a session value from the request's session object based on the provided key.
 * If the session object and the specific session key exist and are of the expected type,
 * the value is returned. Otherwise, `null` is returned.
 *
 * @function
 * @param {Record<string, any>} req - The request object, which contains the session data.
 * @param {string} where - The key for which the session value is being retrieved.
 *
 * @returns {string|null} The session value associated with the provided key, or `null` if it doesn't exist or isn't valid.
 *
 * @example
 * const userToken = cookieSession(req, 'authToken');
 * if (userToken) {
 *   console.log('Session token:', userToken);
 * } else {
 *   console.log('No valid token in session');
 * }
 */
export default function cookieSession(req: Record<string, any>, where: string): string | null;
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