/**
 * Read theme and mode from request cookies (server-side).
 *
 * @returns An object with `theme` and `mode` strings.
 */
export declare const getThemeFromCookie: import("@tanstack/react-start").OptionalFetcher<undefined, undefined, Promise<{
    theme: string;
    mode: string;
}>>;
/**
 * Write theme and mode to response cookies (server-side).
 *
 * @param data - Object with `theme` and `mode` to persist.
 */
export declare const setThemeInCookie: import("@tanstack/react-start").OptionalFetcher<undefined, (data: {
    theme: string;
    mode: string;
}) => {
    theme: string;
    mode: string;
}, Promise<{
    success: true;
}>>;