> node can find-and-replace type information with spaces from .ts files and try and executing them as if they were plain JavaScript

That’s what all the other tools like ts-node and tsx do already.

I’m not sure what more are you expecting to do?

Typescript is build time type checked, there is no runtime component to TypeScript. If you want type checking you run tsc.

I think this is a great step in the right direction by node. It will save transpiration on the server and improve stack traves and whatnot.

> Once you start using the type system more extensively I suspect this will blow-up in your face.

I don’t see why. There isn’t any more runtime information in “complex” TypeSceipt types than in simple ones. It’s all build time - see above.

> What a missed opportunity to do it properly

Please explain in more detail what “doing it properly” means to you. Including the typechecker? If so that wouldn’t make sense - they would be competing with TypeScript itself, they shouldn’t, all the “third party plugins” rely on tsc for type checking.