code: func (cli *Client) ConfigList(ctx context.Context, options types.ConfigListOptions) ([]swarm.Config, error) {
  	if err := cli.NewVersionError("1.30", "config list"); err != nil {
  		return nil, err
  	}
  	query := url.Values{}
  
  	if options.Filters.Len() > 0 {
  		filterJSON, err := filters.ToJSON(options.Filters)
  		if err != nil {
  			return nil, err
  		}
  
  		query.Set("filters", filterJSON)
  	}
  
  	resp, err := cli.get(ctx, "/configs", query, nil)
  	defer ensureReaderClosed(resp)
  	if err != nil {
  		return nil, err
  	}
  
  	var configs []swarm.Config
  	err = json.NewDecoder(resp.body).Decode(&configs)
  	return configs, err
  }
docs: // ConfigList returns the list of configs.