How to use the @accounts/server.ServerHooks.CreateUserSuccess function in @accounts/server

let user = await this.db.findUserByServiceId(params.provider, oauthUser.id);

    if (!user && oauthUser.email) {
      user = await this.db.findUserByEmail(oauthUser.email);
    }

    if (!user) {
      try {
        const userId = await this.db.createUser({
          email: oauthUser.email,
        });

        user = (await this.db.findUserById(userId)) as User;

        if (this.server) {
          await this.server.getHooks().emit(ServerHooks.CreateUserSuccess, user);
        }
      } catch (e) {
        if (this.server) {
          await this.server.getHooks().emit(ServerHooks.CreateUserError, user);
        }

        throw e;
      }
    }

    await this.db.setService(user.id, params.provider, oauthUser);

    return user;
  }

defer(async () => {
        if (this.options.sendVerificationEmailAfterSignup && user.email)
          this.sendVerificationEmail(user.email);

        const userRecord = (await this.db.findUserById(userId)) as User;
        this.server.getHooks().emit(ServerHooks.CreateUserSuccess, userRecord);
      });