TypeScript is a superset of JavaScript, and the Getting Started page points to guides for adding TypeScript across existing JavaScript ecosystems.

- React: “If create-react-app had an option to include TypeScript, this is what you'd get: the perfect starting point for React + TypeScript.”

- Angular: “The Angular team recommends using TypeScript with all your Angular projects. Check out this tutorial to get started.”

- Node.js / Express: “Check out this starter project using Express + MongoDB + TypeScript and see why TypeScript and Node.js are a perfect combination.”

- Babel: “Leverage TypeScript for type-checking in your Babel 7 and above projects.”

- React Native: “React Native brings JavaScript to mobile devices, TypeScript keeps productivity going.”

- Vue.js: “Check out this TodoMVC application using Vue.js and TypeScript.”

- ASP.NET Core: “This quick start guide will teach you how to get TypeScript and ASP.NET Core running in Visual Studio quickly.”

- WeChat: “Start building WeChat mini programs with TypeScript with this starter guide. Try it now!”

Already have a codebase? “Check out this guide for a step-by-step walkthrough of converting to TypeScript.” Community samples such as “Battleship, raytracer, and many more community contributed samples can be found here.”