code: protected function renderTypeName(Type $type)
      {
          $this->typeCheck->renderTypeName(func_get_args());
  
          if ($type instanceof NullifiedType) {
              return $type->originalType()->accept($this->typeRenderer());
          }
  
          return $type->accept($this->typeRenderer());
      }
docs: @param Type $type
  
  @return string