pub_sub_snippet.js

const functions = require('@google-cloud/functions-framework');

functions.cloudEvent('helloPubSub', cloudEvent => {
    // The Pub/Sub message from Elevar is passed as the CloudEvent's data payload.
    const base64Data = cloudEvent.data.message.data;

    // Decode the base 64 encoded message
    const data = Buffer.from(base64Data, 'base64').toString();

    // Log the results
    console.log(data);
});