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Release of TypeScript 5.5 Beta
Microsoft announces the public beta of TypeScript 5.5, focusing on developer productivity and language precision.
Smarter Type Narrowing
Enhanced support for control flow analysis, especially with union and intersection types.
More accurate type resolution within if, switch, and logical conditions.
Speed Improvements
Build times reduced up to 15% on large codebases.
Optimized incremental builds with improved caching mechanisms.
Better JSX Handling
JSX type checking is more intuitive, benefiting frameworks like React, Solid, and Preact.
Improved inference when using children in component props.
New Utility Type: Awaited<T> Improvements
Better behavior when dealing with nested Promises.
Helps developers write cleaner asynchronous logic.
Import Type Enhancements
Expanded capabilities to import types directly from packages, reducing coupling and improving type safety.
Example: import("package").TypeName
Improved Editor Integration
Works seamlessly with VS Code 1.91+, providing faster autocomplete and better inlay hints.
Enhanced support for in-editor documentation and diagnostics.
Updated --moduleResolution Settings
New "node16" resolution mode defaulted in some configs.
Ensures compatibility with modern JavaScript project setups.
Compatibility with ECMAScript 2024
Adds support for upcoming ES2024 features like Set methods (Set.prototype.difference) and function decorators.
Developers can start experimenting with future syntax.
Community Feedback Welcome
Microsoft encourages developers to try out the beta and report issues or suggestions before the final release in late June 2025.
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