How to use the @angular/platform-server.renderModuleFactory function in @angular/platform-server

expressApp.engine('html', (_, options, callback) => {
    renderModuleFactory(AppServerModuleNgFactory, {
      // Our index.html
      document: template,
      url: options.req.url,
      // DI so that we can get lazy-loading to work differently (since we need it to just instantly render it)
      extraProviders: [
        provideModuleMap(LAZY_MODULE_MAP),
        {
          provide: 'serverUrl',
          useValue: `${options.req.protocol}://${options.req.get('host')}`
        }
      ]
    }).then(html => {
      callback(null, html);
    });
  });

    previousRender = previousRender.then(_ => renderModuleFactory(AppServerModuleNgFactory, {
        document: index,
        url: route,
        extraProviders: [
            // tslint:disable-next-line: no-unsafe-any
            provideModuleMap(LAZY_MODULE_MAP)
        ]
    })).then(html => {
        writeFileSync(join(fullPath, 'index.html'), html);

export default createServerRenderer(params => {
  const { AppServerModule, AppServerModuleNgFactory, LAZY_MODULE_MAP } = (module as any).exports;

  const options = {
    document: params.data.originalHtml,
    url: params.url,
    extraProviders: [
      provideModuleMap(LAZY_MODULE_MAP),
      { provide: APP_BASE_HREF, useValue: params.baseUrl },
      { provide: 'BASE_URL', useValue: params.origin + params.baseUrl }
    ]
  };

  const renderPromise = AppServerModuleNgFactory
    ? /* AoT */ renderModuleFactory(AppServerModuleNgFactory, options)
    : /* dev */ renderModule(AppServerModule, options);

  return renderPromise.then(html => ({ html }));
});

app.engine('html', (_, options, callback) => {
    renderModuleFactory(AppServerModuleNgFactory, {
      // Our index.html
      document: template,
      url: options.req.url,
      // DI so that we can get lazy-loading to work differently (since we need it to just instantly render it)
      extraProviders: [
        provideModuleMap(LAZY_MODULE_MAP)
      ]
    }).then(html => {
      callback(null, html);
    });
  });
}

const renderer = url => {
  const spinner = ora('Route: ' + url.route).start();
  return renderModuleFactory(AppServerModuleNgFactory, {
    document: index,
    url: url.route,
    extraProviders: [provideModuleMap(LAZY_MODULE_MAP)]
  }).then(html => {
    writeFileSync(join(url.fullPath, "index.html"), html);
    spinner.succeed();
    return url;
  }, error => {
    spinner.fail('Unable to render ' + url);
    console.log(error);
  });
};

export const app = (req, res) => {
    renderModuleFactory(AppServerModuleNgFactory, {
        document: index,
        url: req.path,
        extraProviders: [
            provideModuleMap(LAZY_MODULE_MAP)
        ]
    }).then(html => {
        res.set('Cache-Control', 'public, max-age=600, s-maxage=1200');
        res.set('Link', linkHeader);
        res.send(html);
    }).catch(console.error); 
}

  previousRender = previousRender.then(_ => renderModuleFactory(AppServerModuleNgFactory, {
    document: index,
    url: route,
    extraProviders: [
      provideModuleMap(LAZY_MODULE_MAP)
    ]
  })).then(html => writeFileSync(join(fullPath, 'index.html'), html));
});

app.engine('html', (_, options, callback) => {
  renderModuleFactory(AppServerModuleNgFactory, {
    document: template,
    url: options.req.url,
    extraProviders: [
      provideModuleMap(LAZY_MODULE_MAP)
    ]
  }).then(html => {
    callback(null, html);
  });
});

  previousRender = previousRender.then(_ => renderModuleFactory(AppServerModuleNgFactory, {
    document: index,
    url: route,
    extraProviders: [
      provideModuleMap(LAZY_MODULE_MAP)
    ]
  })).then(html => writeFileSync(join(fullPath, 'index.html'), html));
});

.then(_ =>
      renderModuleFactory(AppServerModuleNgFactory, {
        document: index,
        url: route,
        extraProviders: [provideModuleMap(LAZY_MODULE_MAP)]
      })
    )