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

export default async function prerenderObj(obj) {
  // Tell helmet to pretend to run on a node server, not in a browser
  // See https://github.com/nfl/react-helmet/issues/310 for details
  Helmet.canUseDOM = false;

  const { result, preloadDump } = await Scrivito.renderPage(obj, () => {
    const bodyContent = ReactDOMServer.renderToString();
    const helmet = Helmet.renderStatic();

    return {
      objId: obj.id(),
      objUrl: Scrivito.urlFor(obj),
      htmlAttributes: helmet.htmlAttributes.toString(),
      headContent: `
          ${helmet.title.toString()}
          ${helmet.meta.toString()}
          ${helmet.link.toString()}
        `,
      bodyAttributes: helmet.bodyAttributes.toString(),
      bodyContent,

test('render', () => {
  global.webpackIsomorphicTools = { assets: () => ({ javascript: { app: 'app.xxx.js' } }) };
  Helmet.canUseDOM = false;
  expect(render(<div>)).toMatchSnapshot();
});
</div>

afterEach() {
    Helmet.canUseDOM = this.helmetCanUseDOM;
    NestedStatus.canUseDOM = this.nestedStatusCanUseDOM;
    global.document = this.document;
    delete global.webpackIsomorphicTools;
  }

describe(__filename, () => {
  const _helmetCanUseDOM = Helmet.canUseDOM;

  beforeEach(() => {
    Helmet.canUseDOM = false;
  });

  afterEach(() => {
    Helmet.canUseDOM = _helmetCanUseDOM;
  });

  const createFakeChunkExtractor = (props = {}) => {
    return {
      getLinkElements: sinon.stub(),
      getMainAssets: sinon.stub().returns([]),
      getPreAssets: sinon.stub().returns([]),
      getRequiredChunksScriptElement: sinon.stub(),
      ...props,

constructor() {
    this.helmetCanUseDOM = Helmet.canUseDOM;
    this.nestedStatusCanUseDOM = NestedStatus.canUseDOM;
    this.document = global.document;
  }

afterEach(() => {
    Helmet.canUseDOM = _helmetCanUseDOM;
  });

import React from 'react'
import Enzyme from 'enzyme'
import Adapter from 'enzyme-adapter-react-16'
import toJson from 'enzyme-to-json'
import Helmet from 'react-helmet'

Enzyme.configure({ adapter: new Adapter() })

global.React = React
global.mount = Enzyme.mount
global.shallow = Enzyme.shallow
global.render = Enzyme.render
global.snapshot = toJson
Helmet.canUseDOM = false