code: function(styleName, path, format) {
      const uri = this.getStylePath(styleName, path, format);
      const scheme = this.getScheme(uri);
  
      if (PUBLIC === scheme || TEMPORARY === scheme) {
        return '/' + this.resolvePath(uri);
      }
  
      throw new Error('Scheme `' + scheme + '` not supported');
    }
docs: Returns absolute URL to derivative image.
  
  @param   {string} styleName
  @param   {string} path
  @param   {string} format
  @returns {string}