text: var hasError = (conf) => {}
  
  function isValid(value) {
      return typeof value == 'string'
  }
  
  function patch(value) {
      return value;
  }
  
  function defaultValue() {
      return '';
  }
  
  function upgrade(value) {
      if(isValid.call(this,value)){
          return value
      }else{
          return;
      }
  }
  
  module.exports = {
      hasError,
      isValid,
      patch,
      defaultValue,
      upgrade
  }