It’s a superset of JavaScript. The big add is static typing, reducing the chance of runtime type errors. It compiles to vanilla JavaScript for distribution. Other new features include enums, interfaces, and generics for more type safety.

[–] humorlessrepost@lemmy.world 2 points 4 days ago (2 children)

Genuine question: is it really a superset if it’s not still valid javascript? Isn’t it more of an abstraction layer on top of javascript?

[–] mercano@lemmy.world 3 points 4 days ago

Superset means all valid JavaScript is also valid Typescript. (At least, so long as you don’t have compiler setting on that requires all variables to have a type declared.)

[–] CookieOfFortune@lemmy.world 1 points 4 days ago

In practice people don’t use Typescript as a superset since they have stricter compiler settings, which would make valid JavaScript fail to compile.