How to use the @verdaccio/commons-api.getUnauthorized function in @verdaccio/commons-api

if (!_package.gitlab) return cb(null, false);

    const packageAccess = _package.access && _package.access.length > 0 ? _package.access : DEFAULT_ALLOW_ACCESS_LEVEL;

    if (user.name !== undefined) {
      // successfully authenticated
      this.logger.debug(`[gitlab] allow user: ${user.name} authenticated access to package: ${_package.name}`);
      return cb(null, true);
    } else {
      // unauthenticated
      if (BUILTIN_ACCESS_LEVEL_ANONYMOUS.some(level => packageAccess.includes(level))) {
        this.logger.debug(`[gitlab] allow anonymous access to package: ${_package.name}`);
        return cb(null, true);
      } else {
        this.logger.debug(`[gitlab] deny access to package: ${_package.name}`);
        return cb(getUnauthorized('access denied, user not authenticated and anonymous access disabled'));
      }
    }
  }

.then(response => {
        if (user.toLowerCase() !== response.username.toLowerCase()) {
          return cb(getUnauthorized('wrong gitlab username'));
        }

        const publishLevelId = ACCESS_LEVEL_MAPPING[this.publishLevel];

        // Set the groups of an authenticated user, in normal mode:
        // - for access, depending on the package settings in verdaccio
        // - for publish, the logged in user id and all the groups they can reach as configured with access level `$auth.gitlab.publish`
        const gitlabPublishQueryParams = { min_access_level: publishLevelId };

        // @ts-ignore
        this.logger.trace('[gitlab] querying gitlab user groups with params:', gitlabPublishQueryParams);

        const groupsPromise = GitlabAPI.Groups.all(gitlabPublishQueryParams).then(groups => {
          return groups.filter(group => group.path === group.full_path).map(group => group.path);
        });

.catch(error => {
            this.logger.error(`[gitlab] user: ${user} error querying gitlab: ${error}`);
            return cb(getUnauthorized('error authenticating user'));
          });
      })