code: function (entity, options, modifiers) {
          !options && (options = {});
  
          var self = this,
              noDefaults = options.noDefaults,
              isV1 = modifiers && modifiers.isV1,
              retainEmpty = options.retainEmptyValues,
              source = entity && (entity.variables || entity.variable || (isV1 && entity.pathVariableData)),
              fallback = options.fallback && options.fallback.values,
              result = _.map(source || fallback, function (item) {
                  var result = {
                      id: (noDefaults || item.id) ? item.id : self.uid(),
                      key: item.key || item.id,
                      value: item.value,
                      type: (item.type === 'text' ? 'string' : item.type) || self.typeMap[typeof item.value] || 'any'
                  };
  
                  item.disabled && (result.disabled = true);
  
                  if (item.description) { result.description = item.description; }
                  else if (retainEmpty) { result.description = null; }
  
                  return result;
              });
  
          if (result.length) { return result; }
      }
docs: A generic utility method to sanitize variable transformations across collection formats.
  
  @param {Object} entity - A generic object that could contain variable data.
  @param {?Object} options - The set of options for variable handling.
  @param {?Object} options.fallback - The fallback values to be used if no variables are present.
  @param {?Boolean} options.noDefaults - When set to true, id will be retained.
  @param {?Boolean} options.retainEmptyValues - When set to true, empty property values will be set to ''
  instead of being deleted.
  @param {Object} [modifiers] - A set of behavioral modifiers for variable handling.
  @param {Boolean} [modifiers.isV1=false] - When set to true, looks for the pathVariableData property as well.
  @returns {Object[]} - The set of sanitized entity level variables.