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A comment on Announcing TypeScript 2.7. Parent comment

Re:Announcing TypeScript 2.7 by buu700 on Wednesday January 31, 2018 @03:25PM (#16277235)
TypeScript itself doesn't really add new language features; it just tracks the ECMAScript spec and considers proposed features for implementation after they hit stage 3.

The enhancements coming out in new TypeScript releases are largely related to typing expressiveness / type inference precision (covering more edge cases where one might have previously resorted to `any`) and strictness (catching more errors at compile time).

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Re:Announcing TypeScript 2.7 by jsheard on Wednesday January 31, 2018 @03:35PM (#16277306)
Indeed, the only Typescript feature I can think of that isn't purely for type checking or lifted from ECMAScript is Enums, and Enums have been around forever.
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Re:Announcing TypeScript 2.7 by camus2 on Wednesday January 31, 2018 @03:59PM (#16277494)
Well it has supports for JSX and decorators which AFAIK aren't in the spec yet. It also has a syntax for class mixins without actually doing any desugaring when the code is transpiled. So it's not quite just JS + types.
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Re:Announcing TypeScript 2.7 by jsheard on Wednesday January 31, 2018 @04:07PM (#16277544)
Ah, I forgot about those. Nonetheless JSX and Decorators were added to the language back in 2015, so they've been sticking strictly to ECMA features for nearly 3 years now.
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Re:Announcing TypeScript 2.7 by namelost on Wednesday January 31, 2018 @10:57PM (#16279545)
It has public, private and protected members (checked at compile-time), which is a bit of a mess because ES is gaining an independent notion of private fields (checked at runtime).
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