I just saw how Node.js supports running TypeScript. 1. Parsing 2. Removing types, interfaces, and other things, and doing the conversion 3. Then you get JavaScript without types 4. Run it. In the second step, it's not compiling TS, but rather removing those type syntaxes and making some appropriate transformations. I've heard that the speed can be up to 10 times faster than a complete TS compilation.