code: function (fieldDefinition, fieldName) {
      const fieldType = propertyHelper.getFieldType(fieldDefinition);
  
      let checks;
      if (fieldType === 'string' || fieldType === 'email') {
        // first create the string checks
        checks = createChecksString(fieldDefinition, fieldName);
      }
  
      if (fieldType === 'email') {
        // for email an additional check will be added
        checks.push(createCheckEmail(fieldDefinition, fieldName));
      }
  
      // This must be the last one, because the email check will delete the value from the content
      if (fieldType === 'string' || fieldType === 'email') {
        const defaultValueCheck = createCheckDefaultValue(fieldDefinition, fieldName);
        if (defaultValueCheck !== undefined) {
          checks.push(defaultValueCheck);
        }
      }
      return checks;
    }
docs: Creates the field splitter for a field, if this field is a multi field
  @param fieldDefinition The field_definition for this field.
  @param fieldName The name of the current field