Fable 5.0.0-rc.7 released!

NewsBot · 7 April 2026 18:19

Fable 5.0.0-rc.7 has been released.

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…

Link: Release 5.0.0-rc.7 · fable-compiler/Fable · GitHub