Microsoft has announced the availability of the release candidate for TypeScript 5.4.

Announcing TypeScript 5.4 RC

Today we’re excited to announce our Release Candidate of TypeScript 5.4! Between now and the stable release of TypeScript 5.4, we expect no further changes apart from critical bug fixes.

To get started using the RC, you can get it  through NuGet, or through npm with the following command:

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npm install -D typescript@rc

Here’s a quick list of what’s new in TypeScript 5.4!

• Preserved Narrowing in Closures Following Last Assignments
• The NoInfer Utility Type
• Object.groupBy and Map.groupBy
• Support for require() calls in --moduleResolution bundler and --module preserve
• Checked Import Attributes and Assertions
• Quick Fix for Adding Missing Parameters
• Upcoming 5.5 Deprecations
• Notable Behavioral Changes

Announcing TypeScript 5.4 RC - TypeScript