Fable 5.0.0-alpha.20 released!

NewsBot · 8 December 2025 16:19

Fable 5.0.0-alpha.20 has been released.

Added

[Python] Add Array.skipWhile support (by @dbrattli)

[Python] Add Array.takeWhile support (by @dbrattli)

[Python] Allow IEnumerator_1 as base class to fix typing issues (by @dbrattli)

[Python] Add Pythonic import path syntax for relative imports (.module, ..parent, ...grandparent) (by @dbrattli)

[Python] Add [<Py.DecorateTemplate>] attribute for creating custom decorator attributes (by @dbrattli)

[Python] Add [<Py.ClassAttributesTemplate>] attribute for creating custom class attribute shortcuts (by @dbrattli)

[Python] Add [<Py.DataClass>] as a built-in shorthand for [<Py.ClassAttributes(style = Attributes, init = false)>] (by @dbrattli)

Fixed

[Python] Fix String.Concat spread operator issue in Python transpilation (by @dbrattli)

[Python] Fix regression [<Erase>] on class types not preventing them from being emitted to Python (by @dbrattli)

[Python] Fix regression %A format specifier to output booleans as lowercase true/false (by @dbrattli)

[Python] Fix various bugs in fable-library numeric types and string operations (by @dbrattli)

Changed

[Python] [<Py.Decorate>] now emits decorator strings verbatim and adds importFrom parameter for explicit import control (by @dbrattli)

Link: Release 5.0.0-alpha.20 · fable-compiler/Fable · GitHub