import { ComputedRef, Ref } from 'vue';
/**
 * 主题类型定义
 */
export type Theme = 'light' | 'dark';
/**
 * 主题切换 Hook
 * @returns {object} 主题相关的方法和状态
 */
export declare function useTheme(): {
    theme: Ref<Theme>;
    isDark: ComputedRef<boolean>;
    isLight: ComputedRef<boolean>;
    setTheme: (theme?: Theme) => void;
    getTheme: () => Theme;
    setLight: () => void;
    setDark: () => void;
    toggleTheme: () => void;
};
/**
 * 监听系统主题变化
 * @returns {(() => void) | undefined} 清理函数或undefined
 */