vue-virtualized-table-booway/src/utils/isValidElement.js

The second version of implementation of `vue-virtual-table` component, it was inspired from [rc-table](https://github.com/react-component/table) and [ant-table](https://ant.design/components/table), API design is 60%+ consistent. Or you could think I tran

/**
 * isValidElement
 * @param {Vue.VNode} element
 */
export function isValidElement(element) {
  return (
    element &&
    typeof element === "object" &&
    "componentOptions" in element &&
    "context" in element &&
    element.tag !== undefined
  ) // remove text node
}