Listen to Messages and output to a list

[sharon-accenture]

I'm listening to a subscription and want to output messages to an array messages and finally post it to an endpoint. But after running this on cloud function, I got console log of all the messages but the body of the request is an empty list.

const messages = [];
const subscription = pubsubClient.subscription(subscriptionNameOrId);
let messageCount = 0;
const messageHandler = message => {
    console.log(`New message ${message.id}:`)
    messages.push(message.data)
    console.log(`\tData: ${message.data}`)
    console.log(`\tAttrs: ${JSON.stringify(message.attributes)}`)
    messageCount += 1
    message.ack()
};

subscription.on('message', messageHandler);

requests.post({
uri: output_endpoint,
headers: {'Content-Type': 'application/json'},
body: {'message': messages},
json: true
});