Intro

As of babel v7, TypeScript support has been added: https://babeljs.io/blog/2018/08/27/7.0.0#typescript-support-babel-preset-typescript

I personally love TypeScript and am sure others would love to see if TypeScript support could be added. As to my knowledge, babel does not do any type checking so that would be left to Visual Studio's intellisense and type checker. I think that works out fine because Visual Studio has pretty good TypeScript support and babel can be left to just transpile code.

What needs to change?

As of right now, the project will need to upgrade babel to v7. Proper configuration could be inspired from babel-preset-react-app.

Final Comments

I think TypeScript support would be an amazing feature to add to React.NET and would grant this project a wider audience. Especially those developers who prefer using TypeScript over JavaScript.