Another reason is probably performance. Executing TS would require a lot of extra CPU and even more energy than JS.
A lot of effort and money has been invested into JS engines. I wonder if making a TS native engine (which nobody has made yet) from scratch might make more sense than adapting JS engines to run TS.
A lot of effort and money has been invested into JS engines. I wonder if making a TS native engine (which nobody has made yet) from scratch might make more sense than adapting JS engines to run TS.