How to use the react-admin.fetchUtils.fetchJson function in react-admin

const httpClient = (url, options = {}) => {
  url = baseUrl(url)
  if (!options.headers) {
    options.headers = new Headers({ Accept: 'application/json' })
  }
  const token = localStorage.getItem('token')
  if (token) {
    options.headers.set(customAuthorizationHeader, `Bearer ${token}`)
  }
  return fetchUtils.fetchJson(url, options).then((response) => {
    const token = response.headers.get(customAuthorizationHeader)
    if (token) {
      const decoded = jwtDecode(token)
      localStorage.setItem('token', token)
      localStorage.setItem('userId', decoded.uid)
      // Avoid going to create admin dialog after logout/login without a refresh
      config.firstTime = false
    }
    return response
  })
}

const httpClient = (url, options = {}) => {
  if (!options.headers) {
    options.headers = new Headers({ Accept: "application/json" });
  }
  const token = localStorage.getItem("token");
  options.headers.set("Authorization", `Bearer ${token}`);
  return fetchUtils.fetchJson(url, options);
};

useEffect(() => {
    fetchUtils
      .fetchJson(subsonic.url('getScanStatus'))
      .then((resp) => resp.json['subsonic-response'])
      .then((data) => {
        if (data.status === 'ok') {
          dispatch(scanStatusUpdate(data.scanStatus))
        }
      })
  }, [dispatch])

const httpClient = (url: string, options: any = {}) => {
  if (!options.headers) {
      options.headers = new Headers({ Accept: 'application/json' });
  }
  const token = localStorage.getItem('auth_token');
  if (token !== null && token !== "") {
    options.headers.set('Authorization', `Bearer ${token}`);
  }
  return fetchUtils.fetchJson(url, options);
};

const unstar = (id) => fetchUtils.fetchJson(url('unstar', id))