/**
 * Tracks the global inner window width dynamically.
 * Automatically handles window resize events, debounced by 150ms to prevent performance thrashing.
 *
 * @returns The current `window.innerWidth` in pixels.
 *
 * @example
 * ```tsx
 * const width = useWidth();
 * return <div>{width < 768 ? "Mobile" : "Desktop"}</div>;
 * ```
 */
export declare function useWidth(): number;