Thanks for your kind words @b3nab. 
If I’m not mistaken, fully converting an existing vanilla-JS project to TypeScript is outside of the scope of the initial stable TypeScript release. But we’ll have some kind of tooling, especially with a CLI command that will generate TypeScript typings based on model schemas.
This will be documented in the next documentation iterations, and you can track the progress on this pull request.
Is there anything else I can help you with?