import type { Ref } from '@stacksjs/stx';
/**
 * Track the previous value of a ref.
 * Returns a ref containing the value before the last change.
 *
 * @param value - The source ref to track
 * @param initialValue - Optional initial value for the previous ref
 */
export declare function usePrevious<T>(value: Ref<T>, initialValue?: T): Ref<T | undefined>;