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Announcing TypeScript 5.5 Beta — It’s not even the final release (expect that in a month or two) but 5.5 has many people excited as it has many major enhancements, including inferred type predicates, the ability to import types in JSDoc via comments, regex syntax checking, isolated declarations, and more. If you want more practical examples, Matt Pocock 🐦 wrote a good Twitter thread.

Announcing TypeScript 5.4 Beta — TypeScript gains Object.groupBy and Map.groupBy, a new NoInfer<T> utility type is introduced to stop TypeScript from digging in to match against inner types during inference, and lots of smaller bits and pieces covered in this lengthy post. The final release is expected in March.