/**
 * Composable for handling header scroll behavior.
 * Tracks scroll direction and provides reactive state for showing/hiding header.
 *
 * @param threshold - Minimum scroll distance before triggering hide/show (default: 10px)
 * @param hideDelay - Delay in ms before hiding header when scrolling down (default: 100ms)
 */
export declare function useHeaderScroll(threshold?: number, hideDelay?: number): {
    isHeaderVisible: Readonly<import("vue").Ref<boolean, boolean>>;
    scrollY: Readonly<import("vue").Ref<number, number>>;
    scrollDirection: Readonly<import("vue").Ref<"up" | "down" | null, "up" | "down" | null>>;
};