PubNub SDK Setup for a Browser-Based Dashboard

Context

You are building a real-time analytics dashboard that runs in the browser. The dashboard needs to connect to PubNub to receive live data updates. Multiple pages/components in the single-page application will need access to the PubNub connection. Users log in with an authenticated account before seeing the dashboard.

Task

Write a JavaScript module (pubnub-client.js) that initializes and exports a configured PubNub client for use throughout a browser-based single-page application. The module should handle user identification properly for a production environment where users have authenticated accounts.

Expected Outputs

• A single pubnub-client.js file that initializes and exports a PubNub instance ready for use across the application.