/**
 * Detects mobile viewport using matchMedia.
 * Returns `false` during SSR/hydration, then updates reactively on resize.
 *
 * @returns `true` when viewport width < 768px, `false` otherwise
 *
 * @example
 * ```tsx
 * import { useIsMobile } from "@neynar/ui/hooks/use-mobile"
 *
 * function ResponsiveLayout() {
 *   const isMobile = useIsMobile()
 *   return isMobile ? <MobileNav /> : <DesktopNav />
 * }
 * ```
 */
export declare function useIsMobile(): boolean;
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