How to use the framework/httpClient/HttpClientUtil.apiUrl function in framework

register: function(model: RegisterModel): Promise {
    return HttpClient.post(apiUrl("account/register"), model);
  }
};

delete: function(id: number): Promise {
    return HttpClient.delete(apiUrl(`users/${id}`));
  },

get: function(): Promise {
    return HttpClient.get(apiUrl("account"));
  },

get: function (id: number): Promise {
    return HttpClient.get(apiUrl(`devices/${id}`));
  },

put: function (device: DeviceModel): Promise {
    return HttpClient.put(apiUrl(`devices/${device.id}`), device);
  },

getAll: function(): Promise {
    return HttpClient.get(apiUrl("users"));
  },

getAvailableDevices: function (id?: number): Promise {
    const url = id ? `devices/available/${id}` : "devices/available";

    return HttpClient.get(apiUrl(url));
  },

getLatest: function(assetId: number): Promise {
    return HttpClient.get(apiUrl(`locations/${assetId}/latest`));
  },

getHistory: function(filter: LocationHistoryRequestModel): Promise {
    return HttpClient.get(formatUrl(apiUrl("locations/history"), filter));
  }
};

delete: function (id: number): Promise {
    return HttpClient.delete(apiUrl(`devices/${id}`));
  },