/**
 * Safely extract a route parameter as a string
 *
 * Handles the fact that useParams can return string | string[] | undefined.
 * For standard path parameters (not catch-all routes), this will always be a string.
 *
 * @param paramName - Name of the route parameter
 * @returns The parameter value as a string, or undefined if not present
 *
 * @example
 * ```tsx
 * // Route: /product/:id
 * const id = useRouteParam('id'); // string | undefined
 * if (!id) return <NotFound />;
 * ```
 */
export declare function useRouteParam(paramName: string): string | undefined;
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