Those definitely help, but the proposed erasableSyntaxOnly flag would disallow all features that can't be erased. So it would prevent you from using features like parameter properties, enums, namespaces, and experimental decorators.

It would essentially help you produce TypeScript that's compatible with the --experimental-strip-types flag (and ts-blank-space), rather than the --experimental-transform-types flag, which is nice because (as someone else in this thread pointed out), Node 23 enables the --experimental-strip-types flag by default: https://nodejs.org/en/blog/release/v23.6.0#unflagging---expe...

Also worth noting that the eslint rules for what `erasableSyntaxOnly` might be are already well established, for those looking to do it today.