# TypeScript

> JavaScript with type annotations.

[JavaScript](https://wiki.g15e.com/pages/JavaScript.txt) with type annotations.

https://www.typescriptlang.org/

특징:

- Uses [structural typing](https://wiki.g15e.com/pages/Structural%20typing.txt)
- Unsound (a type system allows certain operations that can’t be known at compile-time to be safe)
  - Function parameter bivariance
  - Rest parameters