How to use the htmlparser2.DomUtils.getText function in htmlparser2

// remove article body-enclosing div (class "threed-sidebar-article-body"), then re-parent children
        const bodyDiv = DomUtils.findOne(elem =>
            elem.attribs && elem.attribs.class && elem.attribs.class.indexOf("threed-sidebar-article-body") >= 0,
            contentDiv.children, true);

        if (bodyDiv) {
            const parent: any = bodyDiv.parent;
            bodyDiv.children.forEach(child => DomUtils.appendChild(parent, child));
            DomUtils.removeElement(bodyDiv);
        }

        const title = DomUtils.findOne(elem => elem.name === "h1",
            contentDiv.children, true);

        const titleText = title && DomUtils.getText(title);
        article.title = titleText || `Article No. ${index + 1}`;

        let imageIndex = 0;
        const imageUrls: Dictionary = {};

        DomUtils.findOne(elem => {
            // download images
            if (elem.name === "img" && elem.attribs && elem.attribs.src) {
                const src = elem.attribs.src;
                const imageUrl = src.startsWith("http") ? src : this.parameters.drupalBaseUrl + src;
                const imageName = filenamify(decodeURIComponent(src.split("/").pop()));
                const imageFileName = `article-${articleIndex}-${imageName}`;
                const imageAssetPath = `${this.articlesDir}/${imageFileName}`;
                this.result.files[`scene_${imageAssetPath}`] = imageAssetPath;

                elem.attribs.src = imageFileName; // relative to location of html file

// remove article body-enclosing div (class "threed-sidebar-article-body"), then re-parent children
    const bodyDiv = DomUtils.findOne(elem =>
        elem.attribs && elem.attribs.class && elem.attribs.class.indexOf("threed-sidebar-article-body") >= 0,
        contentDiv.children, true);

    if (bodyDiv) {
        const parent: any = bodyDiv.parent;
        bodyDiv.children.forEach(child => DomUtils.appendChild(parent, child));
        DomUtils.removeElement(bodyDiv);
    }

    const title = DomUtils.findOne(elem => elem.name === "h1",
        contentDiv.children, true);

    const titleText = title && DomUtils.getText(title);
    article.title = titleText || `Article No. ${index + 1}`;

    let imageIndex = 0;
    const imageUrls: Dictionary = {};

    DomUtils.findOne(elem => {
        // download images
        if (elem.name === "img" && elem.attribs && elem.attribs.src) {
            const src = elem.attribs.src;
            const imageUrl = src.startsWith("http") ? src : context.drupalBaseUrl + src;
            const imageName = filenamify(decodeURIComponent(src.split("/").pop()));
            const imageFileName = `article-${articleIndex}-${imageName}`;
            const imageAssetPath = `${context.articleDir}/${imageFileName}`;
            context.files[imageAssetPath] = imageAssetPath;

            elem.attribs.src = imageFileName; // relative to location of html file

max_depth: 6
  }, options);

  const headingsSelector = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'].slice(options.min_depth - 1, options.max_depth).join(',');

  const dom = parseHtml(str);
  const headings = DomUtils.find(el => headingsSelector.includes(el.tagName), dom, true);

  const result = [];

  if (!headings.length) return result;

  for (const el of headings) {
    const level = +el.name[1];
    const id = getId(el);
    const text = escapeHTML(DomUtils.getText(el));

    result.push({ text, id, level });
  }

  return result;
}