Bump Fable.Core from 4.5.0 to 5.0.0 by dependabot[bot] · Pull Request #20 · Neftedollar/Next.fs

dependabot · 2026-04-23T03:20:09Z

Updated Fable.Core from 4.5.0 to 5.0.0.

Release notes

Sourced from Fable.Core's releases.

5.0.0

Fixed

[Python] Fix derived classes of generic abstract classes not being instantiable due to mismatched mangled method names between abstract stubs and overrides (by @dbrattli)
[Dart/Rust] Fix ResizeArray reference equality (by @ncave)
[JS/TS/Python/Beam] Fix ResizeArray (System.Collections.Generic.List) equality to use reference equality instead of structural equality (fixes #3718)
[Beam] Fix List.Cons call replacement and test (by @ncave)
[Beam/Dart/Python/TypeScript] Fix Array.Equals to use reference equality instead of structural equality (by @ncave)
[Dart/Python/TypeScript/Rust] Fix Seq.foldBack2 for sequences with different lengths (by @ncave)
[All] Fix missing HashSet implementations and tests (by @ncave)
[Rust] Fix Array/HashMap/HashSet internal representation (by @ncave)
[Rust] Fix F# classes reference equality semantics (by @ncave)
[Python] Fix missing Array module implementations and tests (by @ncave)
[Python] Fix object expressions implementing interfaces with [<CLIEvent>] members no longer produce unimplementable abstract Protocol members (fixes #3039)
[Python] Fix DateTime.TryParse incorrectly assigning DateTimeKind.Local to naive datetime strings (should be DateTimeKind.Unspecified) (fixes #3654)
[JS/TS] Fix String.Contains ignoring StringComparison argument (second argument was silently discarded)
[Python] Fix String.Contains ignoring StringComparison argument (second argument was silently discarded)
[All] Fix --noRestore not skipping MSBuildCracker restores (by @ randrag)

5.0.0-rc.7

Added

[Python/Beam] Add F# quotation support — construction, pattern matching, and evaluation via LeafExpressionConverter.EvaluateQuotation (by @dbrattli)
[JS/TS] Add F# quotation support — construction, pattern matching, and evaluation (by @OnurGumus)
[All] Add support for Guid.CreateVersion7() and Guid.CreateVersion7(DateTimeOffset) (by @OnurGumus)
[All] Add missing Array, List, and Seq random choice/shuffle/sample members and tests (by @ncave)
[Dart/Rust] Add missing System.Random implementations and tests (by @ncave)
[Beam] Implement missing DateTimeOffset members, add DateOnly and TimeOnly support (by @dbrattli)

Fixed

[All] Fix unnecessary object allocations during AST traversal when visiting Import expressions (by Repo Assist)
[Beam] Fix System.Random.Next(0) implementation (by @ncave)
[Python] Fix System.Random seeded implementation (by @ncave)
[Beam] Fix System.Random seeded implementation to use per-instance state (by @dbrattli)
[Dart] Fix Array.compareWith comparing lengths before elements, producing wrong results for arrays with common prefixes (fixes #2961)
[Python] Fix unsafe option unwrapping in DateTimeOffset.get_Offset and regex replacements (by @dbrattli)
[All] Replace unsafe option .Value unwrapping with safe alternatives in Python/Replacements.fs and Rust/Fable2Rust.fs (code scanning alerts IONIDE-006)
[All] Add [<return: Struct>] to partial active patterns in Dart and Rust targets to reduce allocations (code scanning alerts IONIDE-009)
[JS/TS] Fix Guid to use cryptographically strong random values (by @ncave)
[Python] Fix DateTimeOffset millisecond constructor and property (by @ncave)
[Python] Implement missing DateTimeOffset members and fix equality/comparison to use UTC-normalized instants (by @dbrattli)
[Python] Add DateOnly and TimeOnly support (by @dbrattli)
[Python] Fix String.IndexOf/LastIndexOf with StringComparison argument emitting it as a start-index instead of a compile error (by @repo-assist)
[Beam] Fix String.IndexOf/LastIndexOf with StringComparison argument incorrectly treating the enum value as a start index
[JS/TS/Python] Fix Async.StartChild with timeout always timing out even when the computation finishes before the deadline (fixes #4481) (by @MangelMaxime)

5.0.0-rc.6

Fixed

[Dart] Enable explicit variable typing for more data types (by @ncave)
[Dart] Fix tests for round, sign, truncate, log, log2, log10, pow, DivRem, Min, Max, Clamp, MinMagnitude, MaxMagnitude, cosh, sinh, tanh, and float Parse (by @ncave)
[Python] Add Math.DivRem support for int, int64, and bigint (by @dbrattli)
[Python] Fix modulo with negative numbers using Python floored semantics instead of .NET truncated semantics for bigint (fixes #4462) (by @dbrattli)
[Beam] Fix System.String.Concat with 4+ arguments not being supported (by @dbrattli)
[TS/Python] Fix thisArg type for overloads in structs (#4453) (by @ncave)
[TS/Python] Fix invalid this argument type in structs (#4453) (by @ncave)
[JS/TS] Fix N format specifier (ToString("N0"), String.Format("{0:N0}", ...)) producing a trailing dot when precision is 0 (fix #2582) (by @MangelMaxime)
[JS/TS] Fix C0 and P0 format specifiers producing trailing dot (e.g., "¤1,000." → "¤1,000") (by @MangelMaxime)
[All] Fix captured side-effect-free values (e.g. empty ResizeArray) being incorrectly inlined into object expression getters in release mode, causing a new instance to be created on each getter call (fixes #3779) (by @MangelMaxime)
[Python] Fix missing await on else branch of ternary expressions in async closures (by @dbrattli)
[Beam] Fix |> ignore on cross-module Emit calls generating variable bindings that shadow Emit case-clause variables (by @dbrattli)
[Beam] Fix containsIdentRef not checking Call ThisArg (by @dbrattli)
[All] Fix CLI color not resetting after error messages (fixes #3755) (by @MangelMaxime)
[JS/TS] StringEnum now respect CompiledValue and CompiledName (by @shayanhabibi)
[JS/TS] Fix invalid syntax emitted when negating negative literals (fix #4251) (by @MangelMaxime)
[Rust] Fix negative counting in CallInfo.GenericArgs (by @ncave)
[Rust] Fix inline bindings and captured idents tracking (by @ncave)
[Rust] Fix return! in async computation expressions so inner async workflows are returned and awaited correctly (by @mizzle-mo)
[JS/TS] Improve Regex.Escape and Regex.Unescape handling (by @MangelMaxime)
[All] Fix allow plugins to target .NET6 target framework (by @MangelMaxime)
[Python] Fix function references passed as arguments inside tail-call optimised functions gaining unnecessary default parameters for outer TCO variables they don't reference (fix #3877)
[TS] Fix abstract instance methods not emitted in TypeScript when class uses [<AttachMembers>] (fixes #3506) (by @MangelMaxime)
[JS/TS] Fix Unchecked.defaultof<'T> for struct types with fields returning undefined instead of zero-initialized values (by @MangelMaxime)
[JS/TS] Fixed quotation for union string cases (by @MangelMaxime)
[Python] Fix Unchecked.defaultof<'T> for struct types with fields returning incorrect values instead of zero-initialized instances (by @MangelMaxime)
[Python] Fix Unchecked.defaultof<char> returning "" (empty string) instead of "\u0000" (null character) (by @MangelMaxime)
[Python] Improve Unchecked.defaultof<_> for declared entities (by @MangelMaxime)

5.0.0-rc.5

Added

[All] Add support for [<InlineIfLambda>] (by @MangelMaxime)

5.0.0-rc.4

Fixed

[JS/TS] Fix Array.zeroCreate producing null for user-defined struct (value type) elements instead of a default-initialized instance (by @MangelMaxime)
[All] Fix interpolated string holes missing format specifiers in State.fs and Python/Replacements.fs (code scanning alerts 1144, 1145, 1512)
[Rust] Replace unsafe .IsSome && .Value option pattern with Option.exists in Fable2Rust.fs (code scanning alert 1125)
[JS/TS] Fix Unchecked.defaultof<char> being emitted as null instead of '\0' (by @MangelMaxime)
[JS/TS] Fix static val mutable fields declared with [<DefaultValue>] not being zero-initialized (fix #2739) (by @MangelMaxime)
[JS/TS/Python] Fix record/struct types augmented with static let or static member val generating extra constructor parameters for each static field, causing constructor arguments to be assigned to wrong slots (by @MangelMaxime)
[TS] Annotate System.Collections.Generic.IList<T> as MutableArray<T> (by @MangelMaxime)
[JS/TS] Fix ResizeArray index getter/setter not throwing IndexOutOfRangeException when index is out of bounds (fix #3812) (by @MangelMaxime)
[Beam] Fix unused term warning in try/catch when exception variable is not referenced (by @dbrattli)
[Beam] Fix "no effect" warning for pure BIF calls (self/0, node/0) in non-final block positions (by @dbrattli)
[Beam] Fix reraise() generating unbound MatchValue variable — use raw Erlang reason variable for re-throw (by @dbrattli)
[Beam] Fix Erlang.receive<'T>() resolving to timeout overload due to F# unit argument (by @dbrattli)
[JS/TS] Generate comments for members in class decorated with [<AttachMembers>] (by @MangelMaxime)
[Beam] Fix [<ImportAll>] generating invalid module:*() Erlang code when binding is used as a value (by @dbrattli)
[Beam] Fix string slicing and Substring with compound expressions producing wrong binary:part length due to missing parentheses in emitted Erlang (by @dbrattli)
[Beam] Fix non-ASCII characters in string literals being truncated to single bytes — emit <<"..."/utf8>> instead of <<"...">> (by @dbrattli)
[Beam] Fix Emit expressions with case leaking variables into surrounding scope — auto-wrap in IIFE for scope isolation (by @dbrattli)

5.0.0-rc.3

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)

5.0.0-rc.2

Added

[Beam] Add arithmetic tests and support for DivRem, MinMagnitude, MaxMagnitude, Decimal rounding, BigInt.Log (by @dbrattli)
[Beam] Add fable_random.erl and fix Random seeded/NextBytes tests (by @dbrattli)

Fixed

[Python] Fix __hash__ to return native int instead of int32 for Python 3.14 compatibility (by @dbrattli)
[Python] Fix PyPI publish workflow version pattern to support rc tags (by @dbrattli)
[Beam] Bundle fable-library-beam in NuGet package so dotnet fable --lang beam works (by @dbrattli)
[Beam] Fix optional arguments by unwrapping at call sites and padding missing trailing args (by @dbrattli)
[Beam] Fix generic constraint interface dispatch (by @dbrattli)
[Beam] Fix class constructor field invokes and explicit val fields (by @dbrattli)
[Beam] Fix mutable record field mutation (by @dbrattli)
[JS/TS] Allows compiling fable-library-ts for Browser environment (by @goswinr)

5.0.0-rc.1

Added

[Beam] Add Erlang/BEAM target (--lang beam). Compiles F# to .erl source files. 2086 tests passing. (by @dbrattli)

Fixed

[Python] Fix type var scoping for PEP 695 annotations: emit Any for type vars outside function scope and prevent non-repeated generic params from leaking into ScopedTypeParams (by @dbrattli)
[JS/TS] Ignore extra args in FSharpType functions (by @olivercoad)

5.0.0-alpha.24

Fixed

[Python] Fix Array.length, .Length, Array.isEmpty, and ResizeArray.Count to use len() instead of .length property for plain Python list interop (by @dbrattli)
[Python] Fix Task<T> pass-through returns not being awaited in if/else and try/with branches (by @dbrattli)
[Python] Fix :? T as x type test pattern in closures causing UnboundLocalError due to cast() shadowing outer variable (by @dbrattli)
[All] Prevent Fable from freezing when running a sub-process via --run (fix #3631) (by @MangelMaxime)
[All] Improve console width detection when rewritting console output (by @MangelMaxime)

5.0.0-alpha.23

Changed

[Python] Changed DU representation to use separate classes for each case (by @dbrattli)
[Python] Fable will no longer auto-generate __str__ or __hash__ for custom types. Use the Py.Stringable and Py.Hashable marker interfaces to generate these methods (by @dbrattli)

Added

[Python] Added ABC base classes for F# types and Py marker interfaces for Python interop (by @dbrattli)
[Python] Add tuple pattern matching with guards and improve match statement generation (by @dbrattli)
[Python] Add Python 3.10+ match statement support for pattern matching (by @dbrattli)

Fixed

[Python] Fix curry/uncurry to handle arbitrary number of arguments (by @dbrattli)
[Python] Fix type annotations for protocols, Option casting, and abstract classes (by @dbrattli)
[Python] Fix type annotations for curried functions and numeric types (by @dbrattli)
[Python] Fix type annotations for inref, IList, DateKind, and regex collections (by @dbrattli)
[Python] Fix type annotations for protocols, ABCs, Atom, and Set module (by @dbrattli)
[Python] Fix type annotations for async functions, date operations, and None handling (by @dbrattli)
[Python] Fix type annotations for tuple indexing, generic defaults, and reflection (by @dbrattli)
[All] Fix StringBuilder.Chars getter and setter (by @MangelMaxime)

Removed

[All] Remove --legacyCracker flag, MSBuild cracker is now the default and the only cracker supported (by @MangelMaxime)

5.0.0-alpha.22

Fixed

[Python] Use Fable AST for type parameter extraction instead of Python AST heuristics (by @dbrattli)
[Python] Fix library type stubs for parse_int32/64 and from_integer (by @dbrattli)
[Python] Fix missing type parameters on generic methods (by @dbrattli)
[JS/TS] Fix #4305 DateTimeOffset.Now returns wrong time (by @ncave)

5.0.0-alpha.21

Added

[Python] Support catching Python BaseException subclasses (KeyboardInterrupt, SystemExit, GeneratorExit) for Python interop (by @dbrattli)

Changed

[Python] F# task { } expressions now generate Python async def functions (by @dbrattli)
[Python] Generate idiomatic except clauses for typed exception patterns (by @dbrattli)

Fixed

[Python] Fix ResizeArray compatibility with Seq/Array functions (by @dbrattli)
[Python] Fix FSharpList generic type parameter handling for IEnumerable_1 compatibility (by @dbrattli)

5.0.0-alpha.20

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)

5.0.0-alpha.19

Fixed

[Python] Fix printf.cont() not applying continuation function when currying (by @dbrattli)

Added

[Python] Add support for [<Py.Decorate>] attribute on methods (previously only worked on classes)
[Python] Add new [<Py.ClassMethod>] attribute to emit @classmethod instead of @staticmethod
[Python] Added support for Pydantic serialization of core numeric and array types (by @dbrattli)

5.0.0-alpha.18

Fixed

[Python] Fix record member method naming (by @dbrattli)
[Python] Fix regression, named arguments not being converted to snake_case (by @dbrattli)
[Python] Fix regression, erased interfaces should not generate code (#4277) (by @dbrattli)

Changed

[Rust] Update fable-library-rust dependencies (by @ncave)
[All] Update TargetFramework to net10.0 (by @ncave)
[All] Update FCS to latest (commit cfda5f6) (by @ncave)

5.0.0-alpha.17

Changed

[Python] fable-library for Python is now distributed via PyPI instead of being bundled in the NuGet package (by @dbrattli)

5.0.0-alpha.16

Fixed

[All] Fix --cwd with quoted paths (by @MangelMaxime)
[All] Fix --legacyCracker flag logic (by @MangelMaxime)
[All] Fix BuildalyzerCracker so it can work on .NET 10 (by @MangelMaxime)

Changed

[All] Invoke MSBuild from Fable current working directory (by @cr3wdayt5p)

5.0.0-alpha.15

Added

[TS] Added support for erasableSyntaxOnly in TypeScript (by @ncave)
[All] Added some default System exception implementations (by @ncave)
[All] Added ofOption/toOption/ofValueOption/toValueOption (by @ncave)
[Python] Added Decorate attribute to add Python decorators to classes (by @dbrattli)
[Python] Added ClassAttributes attribute to control Python class generation (@dbrattli)
[Python] Added support for Python 3.14 (by @dbrattli)

Changed

[JS/TS] Replace the deprecated substr method with slice (by @Thorium)

Fixed

[TS] Fix ObjectExpr tests with multiple interfaces (by @ncave)
[TS] Fix ObjectExpr abstract base constructor type (by @ncave)
[JS/TS] Fix #4240 Missing DateTime constructor (by @ncave)
[PHP] Fix php import extensions (by @MangelMaxime)
[TS] Fix #3973 Typescript imports file extension (by @ncave)
[TS] Fix support for abstract classes and members (by @ncave)
[TS] Fix getters, setters, indexers in interfaces (by @ncave)
[TS] Enable typedArrays flag usage for TypeScript (by @ncave)
[All] Fix #4221 Fable.Type union case arg names (by @ncave)
[All] Erase Nullable Reference Types to inner type (by @ncave)
[Python] Improve Python (e.g. Pydantic) interop (by @dbrattli)
[JS/TS] Fix comparers for non-nullable types (by @ncave)
[Rust] Fix curried object expression getters (by @ncave)
[Rust] Fix compiler-generated generic args (by @ncave)
[All] Fixed #4041 missing unit argument (by @ncave)
[JS/TS/Python] Fixed eq comparer mangling (by @ncave)
[All] Fix all BitConverter return types (by @ncave)
[TS] Don't cast union case types to any (by @ncave)
[JS/TS] Fix Dictionary.ICollection.Remove (by @ncave)
[TS/Dart] Fixed optional parameter types (by @ncave)
[TS] Initialize un-initialized variables (by @ncave)
[JS/TS] Replace Error with Exception (by @ncave)
[All] Fix MSBuildResolver to include define when restoring the project (by @MangelMaxime)

5.0.0-alpha.14

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 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.Sleepto handle TimeSpan correctly (#4137) (by @dbrattli)
[Python] Make sure snake-cased Record do not conflict (by @dbrattli)
[Python] Do not return None | None for optional unit types (#4127) (by @dbrattli)
[JS/TS] JSX : Alias empty CEs list to null when encountered in the children list (by @MangelMaxime)
[JS/TS] JSX : Allow usage of unbox when definining properties for JSX.create (by @MangelMaxime)

5.0.0-alpha.13

Fixed

[Python] Fixed testing with interfaces leads to incorrect pattern match (#3972) (by @dbrattli)
[Python] Fixed error when type contains multiple generic type parameters (#3986) (by @dbrattli)
[Python] Fixed import path handling for libraries (#4088) (by @dbrattli)
[Python] Reenable type aliasing for imports with name "*" (by @Freymaurer)
[JS/TS] Optimise JSX output in order to avoid F# list CEs to surface in it (by @MangelMaxime)

Removed

[All] Remove unused Fable.Core copy types from internal module (by @MangelMaxime)

5.0.0-alpha.12

Added

[Python] Add support for nullArgCheck(by @MangelMaxime)
[All] Add support for F# nullness (by @MangelMaxime)
[JS/TS] Add support for Unchecked.nonNull (by @MangelMaxime)
[All] Add support for TreatWarningsAsErrors (by @MangelMaxime)
[All] Print help message on unexpected arguments (by @MangelMaxime)

Fixed

[JS/TS] Make nullArgCheck report the same error message as on .NET (by @MangelMaxime)
[TS] Sanitize DUs case names when generating constructor function (by @MangelMaxime)
[All] Don't print help message on failed compilation (by @MangelMaxime)
[JS] Don't generate an import statement for pojos defined in another file (by @shayanhabibi)

5.0.0-alpha.11

Added

[JS/TS] Add support for CaseRules.LowerAll on StringEnums (by @shayanhabibi)
[Rust] Support Rust 2024 language edition (by @ncave)
[JS/TS] Add C and c format for numeric types (by @MangelMaxime)
[JS/TS] Add B and b format for numeric types (by @MangelMaxime)
[JS/TS] Add n format for numeric types (by @MangelMaxime)
[JS/TS] Generate compiler error when detecting an invalid/unsupported format specifier for numeric types (by @MangelMaxime)

Fixed

[JS/TS] Fix #4025: No reflection info for pojos (by @alfonsogarciacaro)
[JS/TS] Fix #4049: decimal/bigint to integer conversion checks (by @ncave)
[JS/TS] Fix decimal to char conversion checks (by @ManngelMaxime)
[JS/TS] Propagate non-captured exception when running Async.Start or Async.StartImmediate (by @MangelMaxime)
[JS/TS] Report an error at compilation time when trying to use Async.RunSynchronously (by @MangelMaxime)
[JS/TS] Fix short DateTime and DateTimeOffset short format strings (by @MangelMaxime)
[All] Don't scan system packages for plugins (by @MangelMaxime)
[JS/TS] Fix date formatting when repeating a format token more than the known format (example repeating 'd' more than 4 times) (by @MangelMaxime)
[Python] Fix date formatting when repeating a format token more than the known format (example repeating 'd' more than 4 times) (by @MangelMaxime)

[JS/TS] Fix #4010: Supports direct nested types when using jsOptions (by @MangelMaxime)

let opts =
    jsOptions<Level1> (fun o ->
        o.level2.level3.valueA <- 10
        o.level2.level3.valueB <- 20
        o.topValueA <- 20
    )

[JS/TS] Fix numeric formats (by @MangelMaxime)

Changed

[JS/TS] Throw an error is an invalid Numeric format is provided (mimic .NET behavior) (by @MangelMaxime)

5.0.0-alpha.10

Added

[Python] - Print root module and module function comments (by @alfonsogarciacaro)
[Rust] Add support for module comments (by @ncave)
[Rust] Add support for null strings (by @ncave)
[TS/JS] Pojo attribute support (by @alfonsogarciacaro)

Fixed

[JS/TS] - Fix anonymous record printing (#4029) (by @alfonsogarciacaro)
[Python] - Fix #3998: PhysicalEquality (by @alfonsogarciacaro)
[Python] Resolve relative paths for non-qualified imports (#3481) (by @alfonsogarciacaro)
[Python] importSideEffects shouldn't generate identifier (#3965) (by @alfonsogarciacaro)
[JS/TS] Fix #4031: Hoist vars locally in for and while loops (@alfonsogarciacaro)

5.0.0-alpha.9

Fixed

[All] Add --realsig+ to fix Method not found: 'Boolean Fable.CompilerOptions.Equals (by @nojaf)

5.0.0-alpha.8

Added

[TS] Include XML Doc comment on interface properties (by @Freymaurer)
[TS] Generate interface type when using the "ParamObject" class pattern (by @MangelMaxime)
[Rust] - Initial support for null values (by @ncave)

5.0.0-alpha.7

Fixed

[All] Disable .NET Welcome message when cracking project (#4014) (by @MangelMaxime)

5.0.0-alpha.6

Added

[All] Add StringBuiler.Append(c: char, repeatCount: int) overload (by @roboz0r)
[All] Added primitive types equality and comparison (by @ncave)
[All] Updated FCS to latest F# 9.0 (by @ncave)
[All] Updated Fable-FCS to latest F# 9.0 (by @ncave)
[All] Updated metadata to latest .NET 9.0 (by @ncave)
[All] Updated FCS type constraints (by @ncave)

Fixed

[Py] Add missing unicode categories in python library (by @joprice)
[All] Log JSON output if we fail to parse MSBuild result (by @MangelMaxime)

5.0.0-alpha.5

Added

[JS/TS/Python] Add new TimeSpan overloads support coming from .NET 9.0 (by @MangelMaxime)
[Rust] Add new TimeSpan overloads support coming from .NET 9.0 (by @ncave)

Fixed

[JS/TS] Fix DateTimeOffset.ToLocalTime (by @MangelMaxime)
[All] Don't fails silently if an unknown argument is provided, instead log the error and print the help message (by @MangelMaxime)

5.0.0-alpha.4

Fixed

[TS] Make discriminated union .Is* properties works (@MangelMaxime)
[JS/TS/Python] Fix h in DateTime.ToString (@MangelMaxime)
[JS/TS] Fix hh in DateTime.ToString (@MangelMaxime)
[JS/TS] Don't generate the setter code if a property is decorated with [<Erase>] (@MangelMaxime)

5.0.0-alpha.3

Fixed

[Python] Fix type testing against uint8, uint32, uint64, decimal (@MangelMaxime)
[JS/TS] Workaround source map generation bug (deteriorate them a little) (@MangelMaxime)

5.0.0-alpha.2

Fixed

[All] Allow Fable 5 to be used with Fable 4 plugins (@ncave)

5.0.0-alpha.1

Added

[All] Add --legacyCracker as a fallback

Changed

[All] Make MSBuildCracker the default
[All] Replace FABLE_COMPILER_4 with FABLE_COMPILER_5 as the compiler directive
[All] Move TargetFramework to net8.0

4.29.0

Fixed

[All] Prevent Fable from freezing when running a sub-process via --run (fix #3631) (by @MangelMaxime)
[All] Improve console width detection when rewritting console output (by @MangelMaxime)

4.28.0

Fixed

[All] Fix BuildalyzerCracker so it can work on .NET 10 (by @MangelMaxime)
[All] Fix --cwd with quoted paths (by @MangelMaxime)

4.26.0

Changed

[All] Fix #4176: Move TargetFramework to net8.0 (@ncave)

4.25.0

Fixed

[JS/TS] Propagate non-captured exception when running Async.Start or Async.StartImmediate (by @MangelMaxime)
[JS/TS] Report an error at compilation time when trying to use Async.RunSynchronously (by @MangelMaxime)

4.24.0

Added

[JS/TS] Added missing ResizeArray.CopyTo replacements (by @ncave)
[JS/TS] Added missing Dictionary constructors from enumerable (by @ncave)

Fixed

[Rust] Fixed import path rewrite (by @ncave)
[Rust] Updated derived interfaces (by @ncave)
[Rust] Updated string comparisons (by @ncave)
[Rust] Fixed derived traits mapping (by @ncave)
[JS/TS] Added missing ICollection helpers (#3914) (by @ncave)
[JS/TS] Added missing IReadOnlyCollection helpers (by @ncave)

4.23.0

Added

[Rust] Added basic class inheritance support (by @ncave)
[Rust] Added String.Replace(char, char) and test (by @ncave)
[Rust] Support type extensions for external types (by @ncave)
[Rust] Support more System.Array methods and tests (by @ncave)
[Rust] Added decision tree multiple target references (by @ncave)
[Rust] Added Char surrogate tests for completeness (by @ncave)
[JS] Add System.String.Normalize support (by @DashieTM)
[JS] Allow [<Erase>] to work on members (by @MangelMaxime)

Fixed

[Rust] Updated derived traits mapping (by @ncave)
[Rust] Updated some collections equality (by @ncave)
[Rust] Fixed try finally handler order of execution (by @ncave)
[JS/TS/Python/Rust] Fixed String.StartsWith/EndsWith (#3934) (by @ncave)
[All/Rust] Removed Regex.Replace from hot paths (by @ncave)
[JS] Fix regression, generate let variable when using import on a private mutable variable (by @MangelMaxime)
[TS] Prevent generics to be duplicated (by @MangelMaxime)
[TS] Fix interface generation when decorated with Mangle (by @MangelMaxime)

4.22.0

Added

[Rust] Added support for Dictionary/HashSet comparers (by @ncave)
[Rust] Updated support for interface object expressions (by @ncave)
[Rust] Added missing ResizeArray methods and tests (by @ncave)
[Rust] Added Async.Sleep and test (by @ncave)

Fixed

GH-3900 [Python] Fix nuget packages with hypens in their names (by @MangelMaxime)
[Rust] Uncurry field types for object expressions (by @ncave)
[Rust] Fixed pattern matching on this argument (by @ncave)
[All] Fixed Missing DU member with interface (#3915) (by @ncave)
[TS] Fixed missing Async type signature (#3864) (by @MangelMaxime)

4.21.0

Added

[JS/TS] Add support for OrdinalIgnoreCase overload for String.EndsWith (#3892) (by @goswinr)
[JS/TS] Add uri.Port, uri.IsDefaultPort (by @MangelMaxime)

Changed

[Python] Remove $ sign when reporting an error from assert_equal and assert_not_equal (#3878) (by @joprice)
[All] Don't hide original error when failing to scan an assembly for plugin (#3896) (by @MangelMaxime)

Fixed

[JS/TS] Fix escaping of { and } in FormattableString (#3890) (by @roboz0r)
[JS/TS] Fix uri.Host to return the host name without the port (by @MangelMaxime)
[JS/TS] Fix TypeScript compilation by resolving type of jsOptions (#3894) (by @ManngelMaxime)

4.20.0 Added

[Rust] Added support for static interface calls (by @ncave)

Fixed

[All] Fixed passing delegates with unit args (#3862) (by @ncave)
[JS/TS] Fixed Decimal comparisons (#3884) (by @ncave)
[Rust] Fixed return type for byref body (by @ncave)

4.19.3 Fixed

[JS/TS] Fixed unwrapping optional arguments (#3847) (by @ncave)

4.19.2 Fixed

[JS/TS] Fixed BigInt.ToDecimal with negative values (#3500) (by @ncave)

4.19.1 Fixed

[All] Ignore testers for erased union cases (#3658) (by @ncave)
[All] Fixed Fable compiler hanging on some errors (#3842) (by @ncave)
[JS/TS] Fixed DateTime.MinValue, DateTime.MaxValue (#3836) (by @ncave)
[JS/TS] Fixed missing field using TypeScriptTaggedUnion (#3837) (by @ncave)

4.19.0 Fixed

[TS] Fixed interface indexers (#3830) (by @ncave)
GH-3835 [All] Use case insensitive comparison when searching for dependencies between fable packages (by @ThisFunctionalTom)

4.18.0 Fixed

GH-3817 [All] Fix broken --precompiledLib switch (#3818) (by @DunetsNM)
[JS/TS] Fixed TimeSpan.FromMilliseconds (#3815) (by @ncave)
[Python] Fixed quotation for union string cases (by @dbrattli)
[Python] Fixed casing issues with identifiers and reflection info (#3811) (by @dbrattli)
[JS/TS/Python] Fixed interface static members (#3566) (by @ncave)

4.17.0 Added

[Rust] Added support for XmlDoc comments (by @ncave)
[Rust] Support captures in object expressions (by @ncave)
[Rust] Added type extensions support (by @ncave)
[Rust] Added Char implementation module (by @ncave)

Fixed

[Python] Fixes for custom hash values (#3796) (by @dbrattli)
[Python] Fix for import of camelCased class (#3808) (by @dbrattli)
[JS/TS] Fixed optional args for reflection (by @ncave)
[JS/TS] Fixed type visibility when parent is namespace (by @ncave)
[JS/TS] Fixed DateTimeOffset.ToString with custom format (by @ncave)
[Rust] Fixed property get on constrained generic types (by @ncave)
[Rust] Fixed module member imports (by @ncave)

4.16.0 Added

[JS/TS] Add ConditionalWeakTable (by @chkn)

4.15.0

Fixed

[JS/TS] Fixed DateTime.Add for DateTimeKind.Unspecified (by @ncave)
[Rust] Fixed deprecated NaiveDateTime usage in DateTime (by @ncave)
[Rust] Fixed generic interface implementation types (by @ncave)
[Rust] Fixed Dictionary constructor from IEnumerable (by @ncave)
[Rust] Fixed Seq.cast support for arrays and lists (by @ncave)
[JS/TS] Boolean.tryParse should not crash on null string (@goswinr)

Added

[Rust] Added some boxing support (by @ncave)

4.14.0 Changed

GH-3772 [JS/TS] Split replacement for DateTime and DateTimeOffset (by @MangelMaxime)

Fixed

GH-3769 [All] Local plugin build does not run indefinably. (by @nojaf)
GH-3769 [JS/TS] Types hidden by signature files should not be exported. (by @nojaf)
GH-3772 [JS/TS] Re-implement DateTime.ToString custom format handling (by @MangelMaxime)
It now supports all custom format specifiers, and behave as if CultureInfo.InvariantCulture was used (Fable does not support Globalization).
GH-3772 [JS/TS] Make compilation fails if calling DateTime constructor with microseconds (by @MangelMaxime)
JavaScript Date does not support microseconds, we need to wait for Temporal to be widely supported before reconsidering this.
GH-3773 [Python] Fix DateTime custom format fffffff and FFFFFFF (by @MangelMaxime)

4.13.0 Added

JavaScript

GH-3759 Add StringBuilder.Chars (by @MangelMaxime)
Added range overload for String.ToCharArray (by @ncave)

Rust

GH-3761 Added StringBuilder.Chars, StringBuilder.Remove and tests. (by @ncave)

Dart

GH-3761 Added StringBuilder support and tests. (by @ncave)

Changed

JavaScript

GH-3761 Updated StringBuilder to remove allocations where possible. (by @ncave)

Python

GH-3761 Updated StringBuilder to remove allocations where possible. (by @ncave)

Fixed

JavaScript

GH-3748 Accessing an array out of bounds should emit an exception (by @MangelMaxime)
GH-3748 Setting an array out of bounds should emit an exception (by @MangelMaxime)
GH-3761 Fixed incorrect StringBuilder.Remove implementation. (by @ncave)

Python

GH-3761 Fixed incorrect StringBuilder.Remove implementation. (by @ncave)

4.12.2 Changed

Update to Fable.AST 4.4.0

4.12.1 Fixed

JavaScript

Embed fable-library-js in Fable DLL (by @MangelMaxime)

4.12.0 Added

All

GH-3733 GH-3727 Add support for more Result API (by @zprobinson)
- Result.isOk
- Result.isError
- Result.Contains
- Result.Count
- Result.DefaultValue
- Result.DefaultWith
- Result.Exists
- Result.Fold
- Result.FoldBack
- Result.ForAll
- Result.Iterate
- Result.ToArray
- Result.ToList
- Result.ToOption
GH-3721 Add --test:MSBuildCracker flag allowing to use the experimental MSBuildCracker (by @nojaf)

JavaScript

GH-3745 Add support for ListCollector (by @nojaf)
- instance.Add
- instance.AddMany
- instance.AddManyAndClose
- instance.Close

Changed

JavaScript

GH-3749 Rename fable-library to fable-library-js (by @MangelMaxime)

Removed

JavaScript

Remove Choice.d.ts from source code of fable-library (by @MangelMaxime)

TypeScript

Remove Choice.d.ts from source code of fable-library (by @MangelMaxime)

Fixed

... (truncated)

4.11.0 Changed

All

GH-3719 Restore dependencies against the .fsproj after evaluating the fable-temp.csproj file (Improves IDE supports) (by @MangelMaxime)
Don't delete fable_modules when re-evaluating the project file after a changes has been detected (Improves HMR experience) (by @MangelMaxime)

Fixed

All

GH-3723 Fix logger initialisation to allow --version to work (by @MangelMaxime)

JavaScript

GH-3716 System.Array.Resize: also handle the case where the array is null (by @chkn)

4.10.0 Added

Python

GH-3663 Complete rewrite of DateTime supports (by @MangelMaxime)
Special thanks to @dbrattli and @ncave for their help
- Constructors
  - From (year, month, day) up to (year, month, day, hour, minute, second, millisecond, microsecond) (with and without DateTimeKind)
  - From ticks (with and without DateTimeKind)
- Instance methods:
  - dt.Year
  - dt.Month
  - dt.Day
  - dt.Hour
  - dt.Minute
  - dt.Second
  - dt.Millisecond
  - dt.Microsecond
  - dt.ToUniversalTime
  - dt.DayOfWeek
  - dt.DayOfYear
  - dt.ToShortDateString
  - dt.ToShortTimeString
  - dt.ToLongDateString
  - dt.ToLongTimeString
  - dt.ToString
  - dt.ToLocalTime
  - dt.Date
  - dt.AddYears
  - dt.AddMonths
  - dt.AddDays
  - dt.AddHours
  - dt.AddMinutes
  - dt.AddSeconds
  - dt.AddMilliseconds
  - dt.AddMicroseconds
  - dt.Kind
- Static methods:
  - DateTime.Today
  - DateTime.Now
  - DateTime.Now
  - DateTime.UtcNow
  - DateTime.MinValue
  - DateTime.MaxValue
  - DateTime.Parse
  - DateTime.TryParse
  - DateTime.SpecifyKind

... (truncated)

4.9.0 Fixed

Python

GH-3655 Fix for Python output file names (by @dbrattli)
GH-3660 Fix for decimal to string with culture (by @dbrattli)

4.8.1

Fixed

All

Fix the version reported by Fable (@MangelMaxime)

4.8.0 Added

Python

GH-3645 Add TimeSpan.Parse and TimeSpan.TryParse support to Python (by @MangelMaxime)
GH-3649 Fixes for List.sortBy (by @dbrattli)
GH-3638 Fixes for Array.sort and Array.sortDescending (by @dbrattli)

Fixed

JavaScript

GH-3465 Fix string.IndexOfAny (by @pkese)

Python

GH-3465 Fix string.IndexOfAny (by @pkese)

Changed

All

Updated FCS to fce0cf00585c12174fa3e51e4fc34afe784b9b4e (by @ncave)
- GH-3675 Breaking Change static members always require static member, disregarding FCS from F# v7.0 and early v8.0 supported dismissing the member keyword.

4.7.0 Added

All

Overall performance improvements
- GH-3620 Removed double-dictionary lookups (by @Thorium)
- GH-3624 Add G-Research analyzers and fix reported issues (by @nojaf)

Fixed

All

GH-3603 Missing .gitignore file in the generated `fable_modules/`` folder (by @MangelMaxime)

Python

GH-3617: Fix comparaison between list option when one is None (by @mangelmaxime)
GH-3615: Fix remove from dictionary with tuple as key (by @dbrattli)
GH-3598: Using obj () now generated an empty dict instead of None (by @dbrattli)
GH-3597: Do not translate .toString methods to str (by @dbrattli)
GH-3610: Cleanup Python regex handling (by @dbrattli)
GH-3628: System.DateTime.Substract not correctly transpiled (by @dbrattli)
GH-3640: All union cases return the same hash code (by @dbrattli)

4.6.0 Added

All

Fix #3584: Unit type compiles to undeclared variable (by @ncave)

Python

Support DateTime(..., DateTimeKind.Utc).ToString("O") (by @MangelMaxime)

Rust

Added Guid.TryParse, Guid.ToByteArray (by @ncave)

Changed

All

Updated .NET metadata to 8.0.100 (by @ncave)

Fixed

Python

Fixed char to string type regression with binary operator (by @dbrattli)
Fix DateTime(..., DateTimeKind.Local).ToString("O") (by @MangelMaxime)
Fix calling value.ToString(CultureInfo.InvariantCulture) (by @MangelMaxime)
Fix #3605: Fix record equality comparison to works with optional fields (by @MangelMaxime and @dbrattli)
PR #3608: Rewrite time_span.py allowing for better precision by using a number representation intead of native timedelta. (by @MangelMaxime)

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--- updated-dependencies: - dependency-name: Fable.Core dependency-version: 5.0.0 dependency-type: direct:production update-type: version-update:semver-major - dependency-name: Fable.Core dependency-version: 5.0.0 dependency-type: direct:production update-type: version-update:semver-major - dependency-name: Fable.Core dependency-version: 5.0.0 dependency-type: direct:production update-type: version-update:semver-major - dependency-name: Fable.Core dependency-version: 5.0.0 dependency-type: direct:production update-type: version-update:semver-major - dependency-name: Fable.Core dependency-version: 5.0.0 dependency-type: direct:production update-type: version-update:semver-major ... Signed-off-by: dependabot[bot] <support@github.com>

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Bump Fable.Core from 4.5.0 to 5.0.0#20

Bump Fable.Core from 4.5.0 to 5.0.0#20
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dependabot Bot commented on behalf of github Apr 23, 2026

5.0.0

Fixed

5.0.0-rc.7

Added

Fixed

5.0.0-rc.6

Fixed

5.0.0-rc.5

Added

5.0.0-rc.4

Fixed

5.0.0-rc.3

Added

Fixed

5.0.0-rc.2

Added

Fixed

5.0.0-rc.1

Added

Fixed

5.0.0-alpha.24

Fixed

5.0.0-alpha.23

Changed

Added

Fixed

Removed

5.0.0-alpha.22

Fixed

5.0.0-alpha.21

Added

Changed

Fixed

5.0.0-alpha.20

Added

Fixed

Changed

5.0.0-alpha.19

Fixed

Added

5.0.0-alpha.18

Fixed

Changed

5.0.0-alpha.17

Changed

5.0.0-alpha.16

Fixed

Changed

5.0.0-alpha.15

Added

Changed

Fixed

5.0.0-alpha.14

Added

Changed

Fixed

5.0.0-alpha.13

Fixed

Removed

5.0.0-alpha.12

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Fixed

5.0.0-alpha.11

Added

Fixed

Changed

5.0.0-alpha.10

Added

Fixed

5.0.0-alpha.9

Fixed

5.0.0-alpha.8

Added

5.0.0-alpha.7

Fixed

5.0.0-alpha.6

Added

Fixed