# Fable 5.0.0-alpha.14 released!

**URL:** <https://forum.devtalk.com/t/fable-5-0-0-alpha-14-released/208251>\
**Category:** Frontend Official News\
**Tags:** newsbot, fable, official-news\
**Created:** [25 July 2025 21:19 UTC](https://forum.devtalk.com/t/fable-5-0-0-alpha-14-released/208251 "2025-07-25T21:19:04Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![NewsBot](https://forum.devtalk.com/user_avatar/forum.devtalk.com/newsbot/32/1114_2.png) [@NewsBot](https://forum.devtalk.com/u/NewsBot)\
**Post date:** [25 July 2025 21:19 UTC](https://forum.devtalk.com/t/fable-5-0-0-alpha-14-released/208251/1 "2025-07-25T21:19:04Z")

</div>

[Fable](https://devtalk.com/fable) 5.0.0-alpha.14 has been released.

> [@](#):
>
> ### Added
> 
> - [Python] Support for Nullable Reference Types (by @dbrattli)
> - [JS/TS] Fix #3533: Add directives prologues supports (by @MangelMaxime)
> - [JS/TS] Support for Nullable Reference Types (by @ncave and @MangelMaxime)
> - [Rust] Initial support for Nullable Reference Types (by @ncave)
> 
> ### Changed
> 
> - [Python] Use Python 3.12 type parameter syntax. Deprecate Python 3.10 and 3.11 (by @dbrattli)
> - [Python] Records now snake-cases all member fields (by @dbrattli)
> - [Python] Anonymous records now preserves the casing of member fields (by @dbrattli)
> - [Python] Option type is now `Option[T]` instead of `T | None` (by @dbrattli)
> - [Python] Use [uv](https://docs.astral.sh/uv/) instead of Poetry for package management (by @dbrattli)
> - [Python] Fable Library for Python is now partially written in Rust (by @dbrattli)
> - [All] Improve filewatcher error messages (by @goswinr)
> 
> ### Fixed
> 
> - [Python] Fixed static properties and are now translated as Python class attributes (by @dbrattli)
> - [Python] Fixed DateTime with DateTimeKind generates proper enum reference (#3689) (by @dbrattli)
> - [Python] Fixed Dictionary KeyValuePair enumeration when casting to IEnumerable (#3771) (by @dbrattli)
> - [Python] Fixed `createEmpty<T>` for interfaces using `SimpleNamespace` with type casting (#3604) (by @dbrattli)
> - [Python] Fixed EmitMethod + ParamObject losing keyword arguments (#3871) (by @dbrattli)
> - [Python] Fixed EmitConstructor + ParamObject losing keyword arguments (#3871) (by @dbrattli)
> - [Python] Fixed DateTimeOffset.TryParse, ToString() and Offset property access (#3854) (by @dbrattli)
> - [Python] Fixed anonymous records in Maps causing comparison errors (#3869) (by @dbrattli)
> - [Python] Fixed handling of erased types for Python (#3968) (by @dbrattli)
> - [Python] Fixed unit function (zero arguments functions) are transpiled inconsistently (#4126) (by @dbrattli)
> - [Python] Fixed resource managers with empty body (#3912) (by @dbrattli)
> - [Python] Fixed `Async.Sleep`to handle TimeSpan…

Link: [Release 5.0.0-alpha.14 · fable-compiler/Fable · GitHub](https://github.com/fable-compiler/Fable/releases/tag/5.0.0-alpha.14)