Hi! Our team is using GrowthBook together with Amplitude. I’m a client-side developer and I’d like to clarify one point.

export const gbInstance = new GrowthBook({
  apiHost: import.meta.env.VUE_APP_GROWTHBOOK_API_HOST,
  clientKey: import.meta.env.VUE_APP_GROWTHBOOK_CLIENT_KEY,
  enableDevMode: !isProduction(),
  plugins: [autoAttributesPlugin()],
  trackingCallback: (experiment, result) => {
    $analytics.track({
      event_type: 'Experiment Viewed',
      event_properties: {
        experimentId: experiment.key,
        variationId: result.key
      }
    });
    console.log(`key-${experiment.key} result-${result.key}`);
  }
});
const initializeGrowthBook = async () => {
  try {
    if ($analytics) {
      gbInstance.updateAttributes({
        id: $analytics.amplitude.getUserId(),
        deviceId: $analytics.amplitude.getDeviceId()
      });
    }
    await gbInstance.init({ streaming: true });
    gbFlags.initialize(gbInstance);
    return gbInstance;
  } catch (e) {
    return null;
  }
};

I’m implementing it like this, and in the plugins I specify

autoAttributesPlugin()

. That generates attributes for targeting (one of them is

id

). When setting up an experiment in the admin panel, you can assign it based on

anonymous_id

or

user_id

. How is this

id

connected with

user_id

or

anonymous_id

? Or do I need to explicitly set

user_id

and

anonymous_id

when initializing? If so, how should this be connected with Amplitude, since it has both

user_id

and

device_id

?