Public preview: Azure Functions V4 programming model for Node.js

Version 4 of the Node.js programming model is now available in preview. This programming model is part of Azure Function’s larger effort to provide an intuitive and idiomatic experience for all supported languages. Key improvements of the V4 model are highlighted in this blog post. 

References:

• TypeScript Quickstart: Functions, Durable Functions 
• JavaScript Quickstart: Functions, Durable Functions
• Azure Functions Developer Guide
• Upgrade to version 4 of the Node.js programming model for Azure Functions