Sample PubNub Function

onBefore.js

// PubNub Functions event handler
// Deploy globally in minutes at https://admin.pubnub.com/

// Specify one channel or all with '*' in the editor

// Use `xhr.fetch(url).then()` to do an HTTP request
const xhr = require("xhr");

export default (request) => {
    
    // Replaces all instances of "bad" with "good" while a message is in transit
    request.message.text.replace(/bad/g, "good");
    
    return request.ok(); // Return a promise when you're done
};