import type { Ref } from '@stacksjs/stx';
/**
 * Track the timestamp of when a ref last changed.
 *
 * @param source - The reactive source to watch
 * @param options - Optional initial timestamp value
 */
export declare function useLastChanged(source: Ref<any>, options?: UseLastChangedOptions): Ref<number | null>;
export declare interface UseLastChangedOptions {
  initialValue?: number | null
}