code: function checkboxHandler (event) {
      const target = event.target;
  
      if (target.checked) {
        link.style.display = 'none';
        if (upload.value) {
          upload.value = '';
          link = clear(link);
        }
      }
      else {
        link.style.display = '';
      }
    }
docs: Checkbox handler for file delete checkbox
  @param  {[type]} event - handler executed when the load event is fired