Microsoft Open Source Blog 
TypeScript is a language for application-scale JavaScript development. It’s a typed superset of JavaScript that compiles to plain JavaScript and was originally created out of a need for a more robust tooling experience to complement JavaScript language developers.
TypeScript makes it easier for developers to write cross-platform, application scale, JavaScript programs that run in any browser or in any host. TypeScript tools can dramatically improve your productivity, allowing you to maintain your existing code and continue to use the same JavaScript libraries you already love.
Get a quick overview of TypeScript in this recent “Five Things” episode with Microsoft Technical Fellow Anders Hejlsberg and John Papa. In the below video, you’ll learn five tings you might not know about TypeScript in five minutes, including control flow analysis, asynchronous callback, compilers, and more.
Learn more at https://aka.ms/5things-azure
To watch more episodes, go to https://aka.ms/FiveThingsPlaylist
Additional information on TypeScript
TypeScript for Beginners
- Check out the TypeScript in 5 minutes tutorial
- Get started fast with framework-specific quick start guides
Already familiar with TypeScript?
- Check out what is new in the latest TypeScript release
- Deep dive into the TypeScript Handbook
- Read the .d.ts authoring guide