Making things seamless for TS would mean more than just accepting the `name: type` syntax and ignoring its `: type` part. ES would also need to accept other syntax from TS: `expr as type`, `type T = ...`, `declare ...`, `class C implements I`, etc. A half job would not cut it because you quickly end up using all these constructs when you develop in TS.
I'm not saying this would be a bad thing (I'd love to have it) but this is going a bit beyond _expanding comments syntax_. Introducing _yet another comments syntax_ which is not understood by TS would not help at all, as we would still need a transpiler.
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