Fable 5.25.0 released!

NewsBot · 29 October 2026 19:19

Fable 5.25.0 has been released.

Features

(all) Error on unsupported RegexOptions at compile time (#5180) (a8cbc5dc)

(js/ts/python/dart) Support Nullable conversions (#5183) (6efa86d3)

(js/ts/python/dart/beam) Support System.Array.BinarySearch and ResizeArray.BinarySearch (#5172) (d332e7d4)

Bug Fixes

(all) Warn on duplicate names in erased unions (#5169) (459166d2)

(all) Recompile inline users of a file with a signature (#5179) (b383673d)

(all) Accept RegexOptions.NonBacktracking (#5178) (a61ec8a1)

(all) Keep F# diagnostics for scripts on Windows (#5218) (ce886964)

(beam) Raise ArgumentNullException from nullArg (0b8f77f9)

(beam) Keep parameter name in ArgumentException (9e5d34f7)

(js/ts) Format DateTimeOffset in its own offset (#5171) (04ddbd20)

(js/ts) Support %o in sprintf and interpolated strings (#5175) (e13e7b0f)

(js/ts) Keep column 0 mappings in source maps (#5176) ([04ba3853](fix(js/ts): keep column 0 mappings in source maps (#5176) · fable-compiler/Fable@04ba385 · GitHub…

Link: Release 5.25.0 · fable-compiler/Fable · GitHub