TypeScript 5.5 Beta Boosts Speed and Type Accuracy

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.

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