code: function () {
  
          var requiredRules = [
              // This one comes out of the box with parsley
              'required',
  
              // These ones were added with this library
              'requiredIf', 'requiredUnless', 'requiredWith', 'requiredWithAll', 'requiredWithout', 'requiredWithoutAll'
          ];
  
          var requiredRulesFound = [];
  
          // Loop over the list to check if they're defined on the field.
          requiredRules.forEach(function (rule) {
              if ('undefined' !== typeof this.constraintsByName[rule]) {
                  requiredRulesFound.push(rule);
              }
          }, this);
  
          // If there's not one required rule, return false
          if (requiredRulesFound.length == 0)
              return false;
  
          // If parsley's on required rule was found
          if (requiredRulesFound.indexOf('required') >= 0) {
              // Check if the flag is set to true
              return false !== this.constraintsByName.required.requirements;
          }
  
          return true;
      }
docs: Normally this was intended Internal only. Field is required if have required constraint without `false` value