Microsoft Announcing TypeScript 6.0 Beta

Today we are announcing the beta release of TypeScript 6.0! To get started using the beta, you can get it through npm with the following command:

npm install -D typescript@beta

TypeScript 6.0 is a unique release in that we intend for it to be the last release based on the current JavaScript codebase. As announced last year (with recent updates here), we are working on a new codebase for the TypeScript compiler and language service written in Go that takes advantage of the speed of native code and shared-memory multi-threading. This new codebase will be the foundation of TypeScript 7.0 and beyond. TypeScript 6.0 will be the immediate precursor to that release, and in many ways it will act as the bridge between TypeScript 5.9 and 7.0. As such, most changes in TypeScript 6.0 are meant to help align and prepare for adopting TypeScript 7.0.

With that said, there are some new features and improvements that are not just about alignment. Let’s take a look at some of the highlights of this release, followed by a more detailed look at what’s changing for 7.0 and how to prepare for it.

Preparing for TypeScript 7.0​

TypeScript 6.0 is designed as a transition release. While the options deprecated in TypeScript 6.0 will continue to work without errors when "ignoreDeprecations": "6.0" is set, they will be removed entirely in TypeScript 7.0 (the native TypeScript port). If you’re seeing deprecation warnings after upgrading to TypeScript 6.0, we strongly recommend addressing them before trying to adopt TypeScript 7 (or its native previews) in your project.

As to the schedule between TypeScript 6.0 and 7.0, we plan for 7.0 to be released soon after 6.0. This should help us keep some continuity in our development with the chance to address issues sooner after the release of 7.0.

What’s Next?​

At this point, TypeScript 6.0 is "feature stable", and we don’t plan on any new features or breaking changes. Over the next few weeks, we’ll be addressing any new issues reported on the 6.0 codebase, so we encourage you to leave feedback and report any issues you encounter. And while the beta release is a great way to try out the next version of TypeScript, we also publish nightly builds on npm and in your editor which are typically very stable. These releases can often give you a better snapshot of which issues have been fixed.

We are also continuing to work on TypeScript 7.0, and publish nightly builds of our native previews along with a VS Code extension too. Feedback on both 6.0 and 7.0 are very much appreciated, and we encourage you to try out both if you can.

So try TypeScript 6.0 beta in your project today, and let us know what you think!

Happy Hacking!

– Daniel Rosenwasser and the TypeScript Team