code: func parseScopes(gcpConfig map[string]string) []string {
  	scopes, ok := gcpConfig["scopes"]
  	if !ok {
  		return defaultScopes
  	}
  	if scopes == "" {
  		return []string{}
  	}
  	return strings.Split(gcpConfig["scopes"], ",")
  }
docs: // parseScopes constructs a list of scopes that should be included in token source
  // from the config map.