/**
 * Hook that shows browser alert when user tries to reload or close the page
 *
 * @param enabled - Whether the hook is enabled (default: true)
 * @param message - Message to show in the alert (default: "Changes you made may not be saved.")
 *
 * @example
 * ```tsx
 * const FormComponent = () => {
 *   const [hasUnsavedChanges, setHasUnsavedChanges] = useState(false);
 *
 *   useBeforeUnload(hasUnsavedChanges, "You have unsaved changes. Are you sure you want to leave?");
 *
 *   return (
 *     <div>
 *       // form fields
 *     </div>
 *   );
 * };
 * ```
 */
export declare function useBeforeUnload(enabled?: boolean | string, message?: string): void;
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