Fable 5.7.0 released!

NewsBot · 9 July 2026 23:18

Fable 5.7.0 has been released.

Features

Add --noGitignore flag to skip generating fable_modules/.gitignore (#4730) (3742b950)

Bug Fixes

MailboxProcessor dropping falsy messages and unit replies (8299b2e7)

(all) Include original exception message when loading a Fable plugin fails (#4739) (659e73a4)

(all) Add Seq.enumerateTryWith for try/with in seq, list, array comprehensions (#4750) (448c90d7)

(beam) EndsWith regression for empty pattern with non-ordinal comparison (eee2ad3f)

(js/ts) Represent union cases with no fields as singletons (3f6e618e)

(js/ts) Match .NET NaN semantics in JS comparison, min and max (7e5106f9)

(js/ts) BigInteger byte-array corruption, checked conversions, gcd, log2 (#4743) (f3cb7f2b)

(js/ts) Observable/Event dropping null/undefined/unit values (#4742) (75bff73b)

(js/ts) EndsWith regression for empty pattern with non-ordinal comparison (7793ed7b)

(js/ts/python) Quote strings with the %A format specifier (#4749) (75321f3b)

*(pytho…

Link: Release 5.7.0 · fable-compiler/Fable · GitHub