Fable 5.0.0-rc.3 released!

NewsBot · 10 March 2026 16:19

Fable 5.0.0-rc.3 has been released.

Added

[Beam] Auto-generate rebar3 scaffold (rebar.config, .app.src) after compilation; .erl files now placed in src/ subdirectories (by @dbrattli)

[Beam] Support [<ImportAll>] + [<Erase>] interface pattern for typed FFI bindings (by @dbrattli)

Fixed

[Beam] Fix dropped top-level side effects — multiple ActionDeclaration main/0 functions are now merged (by @dbrattli)

[Beam] Fix %% escape in string interpolation producing double % instead of single (by @dbrattli)

[Beam] Fix double-quoted atoms for uppercase CompiledName on DU cases (e.g. ''EXIT'' → 'EXIT') (by @dbrattli)

[Beam] Fix cross-project imports producing self-recursive calls when source files share the same name (by @dbrattli)

[Beam] Support Type.GetGenericArguments and Type.GetInterface for reflection (by @dbrattli)

[TS] Correctly resolve type references for TypeScriptTaggedUnion (by @MangelMaxime and @jrwone0)

[TS] Expose optional stack property on Exception (by @MangelMaxime)

[Python] Fix nonlocal/global declarations generated inside match/case bodies causing SyntaxError (by @dbrattli)

[Python] Fix exception variable captured in deferred closures causing NameError (PEP 3110 scoping) (by @dbrattli)

[JS/TS] Support format specifiers and single hole in JSX string templates (by @MangelMaxime)

[All] Fix generic parameter resolution in inline functions with static member constraints (by @Programmerino and @MangelMaxime)

Link: Release 5.0.0-rc.3 · fable-compiler/Fable · GitHub