Announcing TypeScript 5.3 RC

Today we’re excited to announce our Release Candidate of TypeScript 5.3! Between now and the stable release of TypeScript 5.3, 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:

npm install -D typescript@rc

Here’s a quick list of what’s new in TypeScript 5.3!

• Import Attributes
• Stable Support resolution-mode in Import Types
• resolution-mode Supported in All Module Modes
• switch (true) Narrowing
• Narrowing On Comparisons to Booleans
• instanceof Narrowing Through Symbol.hasInstance
• Checks for super Property Accesses on Instance Fields
• Interactive Inlay Hints for Types
• Settings to Prefer type Auto-Imports
• Optimizations by Skipping JSDoc Parsing
• Optimizations by Comparing Non-Normalized Intersections
• Consolidation Between tsserverlibrary.js and typescript.js
• Breaking Changes and Correctness Improvements

Announcing TypeScript 5.3 RC - TypeScript