This has nothing to do with the "node world". Such an enormous feature would have to go into ECMAScript. Which is very, very unlikely to ever happen, they may as well design a new language. All those runtimes implement that spec. Expecting them to write an extremely complex new feature that is easily more complicated than everything already implemented (especially with backwards compatibility, and given that the language was not designed for this) would be a bit much.

TypeScript is for compile time checking of a language that was not designed to have them. Runtime types have very different requirements! It has to be in the language from the early design phase, otherwise it will just be a hack with many conditions, restrictions and holes.

TS Types are only partially a description of the underlying types in the code, a very big part instead is that it provides guard rails that prevent you from using a lot of perfectly fine and valid JS code that would however be incompatible with type guarantees. You pay the price of using only a part of the large space of JS code possibilities for guarantees. If you were to put that into the runtime you would end up with two different versions of the language. If you still want to support the full JS you would end with two runtimes in one (or one that has so many branches and conditions that maintaining that runtime is a real beast).

ECMAScript community is actually dipping their toes in the water of adding typing to the spec, and it's at Stage 1: https://github.com/tc39/proposal-type-annotations.

Now of course, this would only add type syntax to the language, not true processing: there's nothing in the spec about actually handling them. Still, it's a step in that direction, so I wouldn't say "very unlikely to ever happen" ... "still a long ways off (if ever)" would be more accurate.

Can't be too hard imo. Primitives can contain an extra metadata field for the types defined in the code. This doesn't really interfere with the runtime and will be backwards compatible. The runtime of course still doesn't actually have to do any type checking, it's just forwarding the type information on a new metadata field so it's not in any way interrupting the core flow of the runtime logic. As a result you can still have the wrong type tagged onto a primitive just like TS has it currently.

Only downside I see is that It can slow down the code as the runtime now has to evaluate type level functions in order to know what to place in the metadata.

But you're right in the sense that it has to go into the core ECMA specification rather then being a node project.