import type { MaybeRef } from './_shared';
import type { Ref } from '@stacksjs/stx';
/**
 * Reactive CSS variable binding.
 *
 * @param name - The CSS variable name (e.g., '--color')
 * @param target - The target element (defaults to document.documentElement)
 * @param defaultValue - Default value if the variable is not set
 */
export declare function useCssVar(name: MaybeRef<string>, target?: MaybeRef<HTMLElement | null | undefined>, defaultValue?: string): Ref<string>;