import type { Ref } from '@stacksjs/stx';
/**
 * Reactive preferred color scheme detection.
 * Returns a ref that tracks the user's OS-level dark mode preference.
 */
export declare function usePreferredDark(): Ref<boolean>;
/**
 * Reactive dark mode with localStorage persistence.
 * Adds/removes the 'dark' class on document.documentElement.
 */
export declare function useDark(): Ref<boolean>;