/**
 * Subscribe to an arbitrary media query and return whether it currently
 * matches. Useful for responsive components that need to branch on
 * viewport size without hand-rolling `matchMedia` plumbing.
 *
 * SSR-safe: returns `false` when `window` is undefined. The effect is
 * client-only, so hydration mismatches are avoided without a null
 * sentinel at the type level.
 *
 * Mirrors the shape of `usePrefersReducedMotion` — Safari < 14 fallback
 * via `addListener` / `removeListener` is included.
 *
 * @example
 *   const isMobile = useMediaQuery('(max-width: 640px)');
 */
export declare function useMediaQuery(query: string): boolean;
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