Null value error getting client

[radianceltd]

I use the following code to get the client：

// [START iot_get_client]
// Returns an authorized API client by discovering the Cloud IoT Core API with
// the provided API key.
const getClient = async serviceAccountJson => {
  // the getClient method looks for the GCLOUD_PROJECT and GOOGLE_APPLICATION_CREDENTIALS
  // environment variables if serviceAccountJson is not passed in
  const authClient = await google.auth.getClient({
    keyFilename: serviceAccountJson,
    scopes: ['https://www.googleapis.com/auth/cloud-platform'],
  });

  const discoveryUrl = `${DISCOVERY_API}?version=${API_VERSION}`;

  google.options({
    auth: authClient,
  });

  try {
    return google.discoverAPI(discoveryUrl);
  } catch (err) {
    console.error('Error during API discovery.', err);
  }
};
// [END iot_get_client]

When I read the client API, Getclient returned to me like this, I don't know how to call const {data} = await client.projects.locations.registries.devices.list (request); the data data

I don't know why this code doesn't work。

If the above client code fails to run, the following code will fail to run

Help me to analyze the reason.

[hongalex]

I believe this a duplicate of issue #1579