Announcing TypeScript 5.9



 Microsoft Dev Blogs:

Today we are excited to announce the release of TypeScript 5.9!

If you’re not familiar with TypeScript, it’s a language that builds on JavaScript by adding syntax for types. With types, TypeScript makes it possible to check your code to avoid bugs ahead of time. The TypeScript type-checker does all this, and is also the foundation of great tooling in your editor and elsewhere, making coding even easier. If you’ve written JavaScript in editors like Visual Studio and VS Code, TypeScript even powers features you might already be using like completions, go-to-definition, and more. You can learn more about TypeScript at our website.

But if you’re already familiar, you can start using TypeScript 5.9 today!

npm install -D typescript

Let’s take a look at what’s new in TypeScript 5.9!

What’s New Since the Beta and RC?​

There have been no changes to TypeScript 5.9 since the release candidate.

A few fixes for reported issues have been made since the 5.9 beta, including the restoration of AbortSignal.abort() to the DOM library. Additionally, we have added a section about Notable Behavioral Changes.


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