That proposal has been inactive since 2018 and isn't referenced anywhere on the TC39 stages - so it's unlikely to go anywhere.
Another proposal seems to be in the works but isn't a match with the contemporary TypeScript version (which could be deliberate; ADT support).
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That proposal has been inactive since 2018 and isn't referenced anywhere on the TC39 stages - so it's unlikely to go anywhere.
Another proposal seems to be in the works but isn't a match with the contemporary TypeScript version (which could be deliberate; ADT support).