Announcing TypeScript 5.3

Today we’re excited to announce the release of TypeScript 5.3!

If you’re not familiar with  TypeScript, it’s a language that adds type syntax to JavaScript to bring type-checking. Type-checking can catch all sorts of issues like typos and forgetting to check for null and undefined. But types go beyond type-checking – the same analyses of TypeScript’s type-checker are used for rich editor tooling like auto-completion, code navigation, and refactorings. In fact, if you’ve been writing JavaScript in editors like Visual Studio or VS Code, that experience is powered by TypeScript!

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

npm install -D typescript

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 - TypeScript