How to use the @remirror/core-utils.isElementDOMNode function in @remirror/core-utils

public createDomRef(): HTMLElement {
    const { toDOM } = this.node.type.spec;

    if (toDOM) {
      const domSpec = toDOM(this.node);
      if (isString(domSpec)) {
        return document.createElement(domSpec);
      }

      if (isDOMNode(domSpec)) {
        if (!isElementDOMNode(domSpec)) {
          throw new Error('Invalid HTML Element provided in the DOM Spec');
        }
        return domSpec;
      }

      // Use the outer element string to render the dom node
      return document.createElement(domSpec[0]);
    }
    return this.node.isInline ? document.createElement('span') : document.createElement('div');
  }

export const findTextNode = (node: Node, text: string): Node | undefined => {
  if (isTextDOMNode(node)) {
    return node;
  } else if (isElementDOMNode(node)) {
    for (let ch = node.firstChild; ch; ch = ch.nextSibling) {
      const found = findTextNode(ch, text);
      if (found) {
        return found;
      }
    }
  }
  return undefined;
};