How to use the react-helmet.peek function in react-helmet

it("creates correct 404 meta and title data", () => {
      // Given
      const meta = [
        { name: "description", content: "" },
        { name: "prerender-status-code", content: "404" },
      ]
      const title = "Page Not Found"
      const links = []
      wrapper = mount()
      // Then
      expect(Helmet.peek().metaTags).toEqual(meta)
      expect(Helmet.peek().linkTags).toEqual(links)
      expect(Helmet.peek().title).toEqual(titleTemplate(title))
    })
  })

it("creates correct meta, link, and title data", () => {
      // Given
      const meta = [{ name: "description", content: "Test description" }]
      const title = "Test title"
      const links = [{ rel: "canonical", href: jestConfig.testURL }]
      wrapper = mount()
      // Then
      expect(Helmet.peek().metaTags).toEqual(meta)
      expect(Helmet.peek().linkTags).toEqual(links)
      expect(Helmet.peek().title).toEqual(titleTemplate(title))
    })

private static getHeadData() {
    return __SERVER__ ? Helmet.renderStatic() : Helmet.peek();
  }

closeMobileMenu() {
    if (!this.state.isMobileMenuOpen) {
      return;
    }
    this.setState({
      bodyClasses: Helmet.peek().bodyAttributes.class,
    });
    this.setState({ isMobileMenuOpen: false });
  }

getWebsitePageTitle() {
    const helmet = Helmet.peek();

    return _.result(_.find(helmet.metaTags, [ 'name', 'mixpanelTitle' ]), 'content');
  };

setTimeout(() => {
    ga("set", "title", Helmet.peek().title || "cloud.gov.au");
    ga("set", "page", location.pathname);
    ga("send", "pageview");
  }, 500);
};

const trackPageView = () => {
  const helmet = Helmet.peek();

  window.analytics.page('Website', {
    Page: _.flow(_.find(['name', 'mixpanelTitle']), _.result('content'))(
      helmet.metaTags
    ),
  });
};

isStatic,
    manifest
  };

  const transfer = {
    base,
    config,
    pattern: { id },
    startBase,
    staticBase,
    isStatic,
    manifest
  };

  const { html, css, status } = await router(uri, render);
  const head = isStatic ? Helmet.peek() : Helmet.rewind();

  const contents = layout({
    attributes: head.htmlAttributes,
    base: startBase,
    css,
    data: transfer,
    html,
    link: head.link,
    meta: head.meta,
    title: head.title,
    scripts: scripts !== false
      ? [
        `${staticBase}/${manifest["vendors~client.js"]}`,
        `${staticBase}/${manifest["client.js"]}`
      ]
      : []