Firebase Emulator Suite - simple pubsub example - google-cloud-functions

Question

I have read MANY docs/blogs/SO articles on using the Firebase Emulator Suite trying a simple pubsub setup, but can't seem to get the Emulator to receive messages.
I have 2 functions in my functions/index.js:
const functions = require('firebase-functions');
const PROJECT_ID = 'my-example-pubsub-project';
const TOPIC_NAME = 'MY_TEST_TOPIC';
// receive messages to topic
export default functions.pubsub
.topic(TOPIC_NAME)
.onPublish((message, context) => {
console.log(`got new message!!! ${JSON.stringify(message, null, 2)}`);
return true;
});
// publish message to topic
export default functions.https.onRequest(async (req, res) => {
const { v1 } = require('#google-cloud/pubsub');
const publisherClient = new v1.PublisherClient({
projectId: process.env.GCLOUD_PROJECT,
});
const formattedTopic = publisherClient.projectTopicPath(PROJECT_ID, TOPIC_NAME);
const data = JSON.stringify({ hello: 'world!' });
// Publishes the message as JSON object
const dataBuffer = Buffer.from(data);
const messagesElement = {
data: dataBuffer,
};
const messages = [messagesElement];
// Build the request
const request = {
topic: formattedTopic,
messages: messages,
};
return publisherClient
.publish(request)
.then(([responses]) => {
console.log(`published(${responses.messageIds}) `);
res.send(200);
})
.catch((ex) => {
console.error(`ERROR: ${ex.message}`);
res.send(555);
throw ex; // be sure to fail the function
});
});
When I run firebase emulators:start --only functions,firestore,pubsub and then run the HTTP method with wget -Sv -Ooutput.txt --method=GET http://localhost:5001/my-example-pubsub-project/us-central1/httpTestPublish, the HTTP function runs and I see its console output, but I can't seem to ever get the .onPublish() to run.
I notice that if I mess around with the values for v1.PublisherClient({projectId: PROJECT_ID}), then I will get a message showing up in the GCP cloud instance of the Subscription...but that's exactly what I don't want happening :)