Announcing TypeScript 5.9 Beta
Table of Contents
Minimal and Updated Support for --generate Flag
In TypeScript 5.9, using the --generate flag with no other flags will generate a plain project in the current directory. This feature allows for deferred evaluation of modules until a property of the imported namespace is accessed. However, note that named and default imports are not compatible with the --generate flag.
Support for --generate Flag
TypeScript 5.9 introduces support for the --generate flag, providing options for project generation and settings.
Expandable Hovers (Preview)
In TypeScript 5.9, hover tooltips will display more information by default, improving the user experience when peeking at variables and type aliases.
Optimizations
TypeScript 5.9 includes optimizations such as caching instantiations on mappers to reduce redundant instantiation of intermediate types.
Feedback on TypeScript 5.9 is encouraged as it is still under development and issues are being addressed.