How to use the @nestjs/typeorm.InjectEntityManager function in @nestjs/typeorm

  constructor(@InjectEntityManager() private em: EntityManager) {}

constructor(
    @InjectRepository(Booking)
    private readonly bookingRepository: Repository,
    @InjectRepository(InvitedGuest)
    private readonly invitedGuestRepository: Repository,
    @InjectRepository(Table)
    private readonly tableRepository: Repository,
    private readonly configService: ConfigurationService,
    private readonly logger: WinstonLogger,
    @InjectEntityManager()
    private readonly entityManager: EntityManager,
    @Optional() private readonly mailer?: MailerService,
  ) {}
<table></table>

    constructor(@InjectEntityManager() private manager: EntityManager) {}

constructor(
    @InjectEntityManager()
    private entityManager: EntityManager,
  ) {
    this.fileTreeRepo = this.entityManager.getCustomRepository(
      FileTreeRepository,
    );
  }

constructor(
        @InjectEntityManager() private entityManager: EntityManager
    ) { }

constructor(
    /**
     * Sample1
     * https://typeorm.io/#/working-with-repository
     * https://typeorm.io/#/repository-api
     * Need TypeOrmModule.forFeature([]) imports
     */
    @InjectRepository(Tablename1)
    private readonly tablename1: Repository,

    /**
     * Sample2
     * https://typeorm.io/#/working-with-entity-manager
     * https://typeorm.io/#/entity-manager-api
     */
    @InjectEntityManager()
    private readonly manager: EntityManager
  ) {

    /**
     * Sample3
     * https://typeorm.io/#/entity-manager-api - getRepository
     */
    this.tablerepo = this.manager.getRepository(Tablename1);
  }