TypeScript 5.9 has been released with notable enhancements such as support for deferred imports, allowing loading of modules and dependencies only when needed. Developers will benefit from a simpler tsconfig file created with the tsc -init command. The new node20 module option will emulate Node.js v20's behavior without future additions, distinguishing it from the existing nodenext mode. This version also brings an expandable hover preview feature, improving developer experience and performance optimizations for tools like Visual Studio Code.
TypeScript 5.9 introduces several features, including support for deferred imports, an improved default project setup via the scaffolding flag, and a more stable module resolution mode for Node.js v20.
The proposed import defer syntax allows developers to defer the loading and execution of a module and its dependencies until the property is accessed.
Developers that are scaffolding new TypeScript configurations using the tsc -init command will be presented with a leaner tsconfig based on feedback.
The new node20 module option will mirror the behavior of Node.js v20 and will not include future features or behaviors like the existing nodenext mode.
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