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Just a random though but if they want speed they could consider making a typescript JIT instead of typescript -> javascript. Typed languages can run much faster than untyped. Maybe that's impossible with current typescript given anything can be changed, eg (30 minutes into running something does Math.floor = ... etc, but maybe some kind of escape analysis could help or maybe push for some new keyword to mark code as safe to optimize.

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Building a new JIT for a dynamic language, if it is supposed to be competitive with JS compilers, is a project several orders of magnitude bigger than building a runtime like this.

TypeScript's design is very much that of a typing layer over a dynamic language. It's unsoundness and various loopholes to escape typing mean it's not much of a help for typed compilation.

Microsoft _do_ have the research project Static TypeScript that does try to do this with a subset: https://www.microsoft.com/en-us/research/publication/static-...

But your point stands I think this subset will be incompatible with how many (including myself) writes TypeScript.

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