How to use the inferno-vnode-flags.VNodeFlags.FormElement function in inferno-vnode-flags

}
    }

    // clear any other DOM nodes, there should be only a single entry for the root
    if ((flags & VNodeFlags.Fragment) === 0) {
      let nextSibling: Node | null = null;

      while (currentNode) {
        nextSibling = currentNode.nextSibling;
        parentNode.removeChild(currentNode);
        currentNode = nextSibling;
      }
    }
  } else if (!isNull(parentNode.firstChild) && !isSamePropsInnerHTML(parentNode, props)) {
    parentNode.textContent = ''; // dom has content, but VNode has no children remove everything from DOM
    if (flags & VNodeFlags.FormElement) {
      // If element is form element, we need to clear defaultValue also
      (parentNode as any).defaultValue = '';
    }
  }
}

if (!isNullOrUndef(children) && isNullOrUndef(props.children)) {
    props.children = children;
  }
  if (vNode.flags & VNodeFlags.Component) {
    if (isString(vNode.type)) {
      vNode.flags = getFlagsForElementVnode(vNode.type as string);
      if (props) {
        normalizeProps(vNode);
      }
    }
  }

  const flags = vNode.flags;

  if (flags & VNodeFlags.FormElement) {
    normalizeFormProps(vNode.type, props);
  }
  if (flags & VNodeFlags.Element) {
    if (vNode.className) {
      props.className = vNode.className;
    }
    normalizeGenericProps(props);
  }

  if (oldCreateVNode) {
    oldCreateVNode(vNode);
  }
};