Announcing TypeScript 5.4

TypeScript 5.4 Release Notes

Preserved Narrowing in Closures Following Last Assignments: TypeScript now preserves narrowing in closures following last assignments, providing more specific type inference.
The Utility Type and Support for calls in import: TypeScript now supports the Utility Type for calls in import, allowing for better modeling of import paths in modern bundlers.
Checked Import Attributes and Assertions: TypeScript now supports Checked Import Attributes and Assertions for more accurate description of import attributes.
Quick Fix for Adding Missing Parameters: TypeScript now provides a quick fix for adding missing parameters in code.
Auto-Import Support for Subpath Imports: TypeScript now supports auto-import for subpath imports, making it easier to import subpath dependencies.

TypeScript 5.5 will deprecate certain features, such as recent behavioral changes.

TypeScript now allows for better type inference in closures following last assignments.
TypeScript now supports Utility Type and calls in import, improving import path modeling.
TypeScript now supports Checked Import Attributes and Assertions for more accurate import attribute descriptions.
TypeScript provides a quick fix for adding missing parameters in code.
TypeScript supports auto-import for subpath imports, simplifying dependency imports.

Since the release candidate, TypeScript has introduced auto-import support for subpath imports.
TypeScript now preserves narrowing in closures following last assignments, providing more specific type inference.
TypeScript supports the Utility Type for calls in import, improving import path modeling.
TypeScript now has Checked Import Attributes and Assertions for more accurate import attribute descriptions.
TypeScript provides a quick fix for adding missing parameters in code.
TypeScript supports auto-import for subpath imports, simplifying dependency imports.