/**
 * Attempts to rotate Google cookies by making a request to the accounts.google.com/RotateCookies endpoint.
 * This function is specifically designed to refresh the __Secure-1PSIDTS cookie.
 * @param {string} psid - The value of the __Secure-1PSID cookie.
 * @param {string} psidts - The value of the __Secure-1PSIDTS cookie.
 * @returns {Promise<string | null>} A promise that resolves to the new __Secure-1PSIDTS cookie value if successful, otherwise null.
 */
export declare function rotateCookies(psid: string, psidts: string): Promise<string | null>;