The typescript compiler is a type checker and a cross-JS-version transpiler in one. Runtime code introduced to support generators in lower ES versions isn't exa

The typescript compiler is a type checker and a cross-JS-version transpiler in one. Runtime code introduced to support generators in lower ES versions isn't exactly the same as the type system needing a runtime component. It's more like "the Babel part" which is included in TS. I personally don't think it's an attractive part of TS; it's confusing, and it's just duplicating efforts that Babel already does best. But that's just me.