How to use the @azure/event-hubs.EventHubClient.defaultConsumerGroupName function in @azure/event-hubs

private static async SendAndReceiveEvents() {
    console.log("creating consumer...");

    const consumer = EventHubs.client.createConsumer(
      EventHubClient.defaultConsumerGroupName,
      EventHubs.partitionId[0],
      EventPosition.fromEnqueuedTime(new Date())
    );

    console.log("sending events...");
    const producerOptions = {
      partitionId: EventHubs.partitionId[0]
    };
    const producer = EventHubs.client.createProducer(producerOptions);
    await producer.send({ body: "JS Event Test 1" });
    await producer.send({ body: "JS Event Test 2" });
    await producer.send({ body: "JS Event Test 3" });

    console.log("receiving events...");
    let eventsReceived = await consumer.receiveBatch(3, 5);
    eventsReceived.forEach((event) => {