Microsoft has announced the release of TypeScript 4.5 beta.
Announcing TypeScript 4.5 Beta
Today we are excited to announce the beta release of TypeScript 4.5! To get started using the beta, you can get it through NuGet, or use npm with the following command: npm install typescript@beta You can also get editor support by Downloading for Visual Studio 2019/2017 Following directions for Visual Studio Code and Sublime Text 3.