Typescript was created at Microsoft.
Learn
TypeScript Deep Dive by basarat is a good tutorial for TS. It helped me understand various terminology like what what package.json, tsconfig.json are. commonjs modules, exports; setting up projects for various target - node.js vs browsers etc.
Typescript Book by Simone Poggiali.
Cloud
Val Town — If GitHub Gists could run And AWS Lambda was fun. Val Town is a social website to write and deploy TypeScript. Build APIs and schedule functions from your browser.