do를 활용한 either

    return pipe(
      TE.Do,
      TE.bind('guests', getGuests),
      TE.bind('households', getHouseholds),
      TE.map(({ guests, households }) => ({
        guests: mapGuestsToDTO(guests),
        households: mapHouseholdsToDTO(households),
      })),
      TE.chain(({ guests, households }) =>
        pipe(InvitationList.create({ guests, households }), TE.fromEither),
      ),
      TE.mapLeft(
        (error: Error) =>
          new Error(`Failed to find guest list: ${error.message}`),
      ),
    );