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Thanks for the concrete description. Can I still use dynamic constructs such as string subscripts to associative arrays and code generation via eval()?

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You mean in TS?

Yes. ∀ x: I can do x in JS → I can do x in TS

But, let's assume for a second that you couldn't: this thread is about TS being future-proof. I.e.: ∃ x: I can do x in TS & I cannot do x in JS? No, false.

This implies TS = JS. And that's the point: semantically, TS = JS.

OK, that's a good start. Is there a tool analogous to JSDoc for TypeScript that gathers the same docs without repeating the type info already in the code?

http://typedoc.io/ might be what you're looking for.

Thanks. Also, some informative samples of what TypeScript itself looks like.

https://github.com/sebastian-lenz/typedoc/blob/master/src/li...

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