TypeScript 4.9 Beta is now available

published on 2022/09/26

Here’s a quick list of what’s new in TypeScript 4.9! The satisfies Operator

  • Unlisted Property Narrowing with the in Operator
  • Checks For Equality on NaN
  • File-Watching Now Uses File System Events

Microsoft DevBlogs

TypeScript is has the most advanced type system for a mainstream language.