fix issues in core

core/racing/domain/entities/LeagueMembership.ts

@@ -11,6 +11,7 @@ import { MembershipRole, MembershipRoleValue } from './MembershipRole';
 import { MembershipStatus, MembershipStatusValue } from './MembershipStatus';
 import { JoinedAt } from '../value-objects/JoinedAt';
 import { DriverId } from './DriverId';
+import { JoinRequest } from './JoinRequest';
 
 export interface LeagueMembershipProps {
   id?: string;
@@ -82,4 +83,6 @@ export class LeagueMembership implements IEntity<string> {
       throw new RacingDomainValidationError('Membership role is required');
     }
   }
-}
+}
+
+export { MembershipRole, MembershipStatus, JoinRequest };