Twilio Programmable Video is a suite of tools for building real-time video apps that scale as you grow, from free 1:1 chats with WebRTC to larger group rooms with many participants. TypeScript is an extension of pure JavaScript - a “superset” if you will - and adds static typing to the language. It enforces type safety, makes code easier to reason about, and permits the implementation of classic patterns in a more “traditional” manner. Parcel is a blazing-fast web configuration bundler that supports hot-module replacement and which bundles and transforms your assets. The article provides a step-by-step guide on how to use Twilio Programmable Video Authentication and Identity using TypeScript to build a video chatting application with identity and user management controls. It covers the requirements, project configuration, configuring TypeScript, adding environment variables, building the token server, updating the client, and running the application.