I got started using typescript to write VS Code extensions such as Power Mode. I now mentor use it daily in my role as a front-end developer and mentor others on my team as we migrate more and more of our codebase to typescript.
I have written TypeScript as part of various frameworks, open source projects, and profesionally. I've also taught TypeScript via webinar and tutorials that were part of my weekly dev-based webcast. Please feel free to ask me any questions!
I got introduced to Typescript through the Angular 2 alpha and since then, I've been using it for projects at and outside of work. I'm a huge fan of the typing system and miss it when I'm working in other languages.