/**
 * @param mobileBreakpoint - Viewport width (px) below which `isMobile` is true. Default 768.
 * @returns isMobile - True when viewport width ≤ breakpoint (resize/narrow window = mobile layout).
 * @returns isTouchDevice - True when the device appears touch-capable (maxTouchPoints > 0, or UA suggests iOS/Android as fallback).
 *   Use `isMobile && isTouchDevice` when you need "mobile phone" logic.
 */
export declare function useMobile(mobileBreakpoint?: number): {
    isMobile: import('vue').ComputedRef<boolean>;
    isTouchDevice: import('vue').ComputedRef<boolean>;
};