/**
 * Custom hook to handle navigation blocking when there are unsaved changes.
 *
 * @param when - Indicates whether to block navigation.
 * @param onSuccess - Callback invoked when navigation is confirmed.
 * @returns An object containing the state of navigation blocking and handlers.
 */
export declare function useNavigationUnsavedChangesDialog(when: boolean, onSuccess: () => void): {
    navigationWasBlocked: boolean;
    handleCancel: () => void;
    handleOk: () => void;
};