F# Weekly #16, 2026 – .NET 11 Preview 3 & SwaggerProvider 4.0 beta Welcome to F# Weekly, A roundup of F# content from this past week: News .NET 11 Preview 3 is now available! TypeFighter Replace Queue with mutable doubly-linked EventList by nojaf · Pull Request #3…

F# Weekly #16, 2026 - .NET 11 Preview 3 & SwaggerProvider 4.0 beta #fsharp sergeytihon.com/2026/04/19/f...

Discord - Group Chat That’s All Fun & Games Discord is great for playing games and chilling with friends, or even building a worldwide community. Customize your own space to talk, play, and hang out.

We will remove the Fantomas Discord in favour of a channel on the #fsharp one:

discord.com/channels/196...

See you there!

Just released SwaggerProvider 4.0.0-beta01 that wrap nullable strings in Option<string>. Try it out and share your feedback! fsprojects.github.io/SwaggerProvi... #fsharp

F# Weekly #15, 2026 – Akkling, FSharp.Data and RANSAC auto-tune Welcome to F# Weekly, A roundup of F# content from this past week: Microsoft News Your Migration’s Source of Truth: The Modernization Assessment – .NET Blog ASP.NET Core 2.3 end of supp…

F# Weekly #15, 2026 - Akkling, FSharp.Data and RANSAC auto-tune #fsharp sergeytihon.com/2026/04/11/f...

F# Weekly #14, 2026 – Serde.FS Brings Compile-Time RPC to F# Welcome to F# Weekly, A roundup of F# content from this past week: News Serde.FS alpha.9 — Compile-time RPC for F# with no reflection, no controllers Florian Verdonck: Fantomas — exploring new appr…

F# Weekly #14, 2026 - Serde.FS Brings Compile-Time RPC to F# #fsharp sergeytihon.com/2026/04/05/f...

🚀 Serde.FS alpha.9 — Deterministic RPC for F#

No reflection. No controllers.
Just compile‑time RPC clients + routing.

Includes:

• [<RpcApi>]
• ASP.NET RPC server
• Deterministic JSON backend
• Shared → Server → Client example

github.com/serde-fs/Ser...

#fsharp #rpc #aot #serde #dotnet

Release Nvim 0.12.0 · neovim/neovim NVIM v0.12.0 Build type: Release LuaJIT 2.1.1774638290 Release notes Changelog (fixes + features) News (:help news in Nvim) Install Windows Zip Download nvim-win64.zip (or nvim-win-arm64.zip fo...

#neovim version 0.12.0 is out! Almost exactly a year of hard work since 0.11.0.

Huge thanks to everyone who worked on it, as well as to all Neovim users!

Release: github.com/neovim/neovi...
News: github.com/neovim/neovi...
Changelog: github.com/neovim/neovi...

Here are top 10 most liked features:

F# Weekly #13, 2026 – Deedle 4.0 is out! Welcome to F# Weekly, A roundup of F# content from this past week: News Addendum: Pattern Variations | Safe Clean Architecture Microsoft News Ten Months with Copilot Coding Agent in dotnet/runtime …

F# Weekly #13, 2026 - Deedle 4.0 is out! #fsharp sergeytihon.com/2026/03/29/f...

🎉 Deedle 4.0.1 is out! The F# data frame library just got a massive update - new packages, new operations, better stats, performance wins, and many long-standing bugs squashed. A huge amount of community-originated requests in one release. Full notes 👇

github.com/fslaborg/Dee...

#fsharp #dotnet

F# Weekly #12, 2026 – 11 years of Ionide 🥰 Welcome to F# Weekly, A roundup of F# content from this past week: News NBomber Studio 0.6.2 | NBomber F# Meetup (Recorded at NRK edition), Wed, Mar 25, 2026, 5:30 PM | Meetup Microsoft News Our co…

F# Weekly #12, 2026 - 11 years of Ionide 🥰 #fsharp sergeytihon.com/2026/03/22/f...

Release v3.1.0 - Repo Assisted · fsprojects/SwaggerProvider feat: Add IgnoreParseErrors parameter to OpenApiClientProvider (#300) feat: Add SchemaReaderErrors property to OpenApiClientProvider (fixes #160) (#327) fix: include response body in OpenApiExcepti...

First Repo Assisted release of SwaggerProvider is out #fsharp github.com/fsprojects/S... 🎉🤖

Next week I will present the new work on Fable Beam at Oslo F# Meetup 💫 #fsharp #fablecompiler

Thank you for involving David! I hope we will find a solution together.

Do you have a link to the RFC for proper Entra ID support? Just want something to track the progress.

Entra Authentication for MCP doesn't work · Issue #12308 · anomalyco/opencode Description The request to my entra app to login and authorize is including resource when it shouldn't And i can't control what is in the resource and it's not matching verbatim what my app registr...

Every tool built on top of it has to implement some kind of workaround—which is almost never done—and proper OAuth flows do not work. github.com/anomalyco/op...

The main issue with using Entra ID for MCP authentication (at least in our case) is incomplete SDK support. For example, the TypeScript MCP SDK does not github.com/modelcontext...

F# Weekly #11, 2026 – F# in .NET 11 Preview 2 Welcome to F# Weekly, A roundup of F# content from this past week: News F# in .NET 11 Preview 2 – Release Notes Safe Clean Architecture RFC: How should Fantomas handle lambda expressions that…

F# Weekly #11, 2026 - F# in .NET 11 Preview 2 #fsharp sergeytihon.com/2026/03/14/f...

F# in .NET 11 Preview 2 - Release Notes #fsharp github.com/dotnet/core/...

📖 After four months of work, the book “Safe Clean Architecture” is now complete 🎉

🔗 Check it out online.
rdeneau.gitbook.io/safe-clean-a...

#fsharp #free #e-book

RFC: How should Fantomas handle lambda expressions that would change semantics on a single line? · Issue #3279 · fsprojects/fantomas RFC: How should Fantomas handle lambda expressions that would change semantics on a single line? Background: how Fantomas works Fantomas is not a "find-and-replace" tool that tweaks whitespace in y...

Hey #fsharp what are your thoughts on github.com/fsprojects/f... ?

F# Weekly #10, 2026 – Start Your Day With Code That’s Better Welcome to F# Weekly, A roundup of F# content from this past week: News Fable · Announcing Fable 5 Release Candidate nugetz — NuGet package browser Microsoft News Release v1.0 of the official MCP C…

F# Weekly #10, 2026 - Start Your Day With Code That’s Better
#fsharp sergeytihon.com/2026/03/08/f...

Hey #fsharp sky!

We have an upcoming role for a dev working at tradekart.com.

Full-Stack, with strong FE skills. We have some react apps, but will probably be looking to build some stuff in HTMX (or similar tech) in next few months.

DM me for more details, please repost for reach.

The wait is over! Fable 5 Release Candidate is officially here.

After a year of hard work from the community, we're bringing you:
✨ .NET 10 & F# 10 support
🐍 A massive Python update (now powered by a Rust core & PyPI!)
🌐 Cleaner JS/TS Pojo bindings

fable.io/blog/2026/20...

#fsharp #fablecompiler

RE#: how we built the world's fastest regex engine in F# | ian erik varatalu

RE#: how we built the world's fastest regex engine in F# iev.ee/blog/resharp... #regex #fsharp

F# Weekly #9, 2026 – Crunching the Technical Debt with Repo Assist Welcome to F# Weekly, A roundup of F# content from this past week: News Pure-F# training/inference workflow around Qwen3-4B with NVFP4 [Poll] Consider changing the default of fsharp_multiline_brack…

F# Weekly #9, 2026 - Crunching the Technical Debt with Repo Assist #fsharp sergeytihon.com/2026/03/01/f...

"Pure-F# training/inference workflow around Qwen3-4B with NVFP4" by @ingted.bsky.social #fsharp github.com/ingted/Qwen3...

"The Functional Blueprint: Teaching TypeScript to Speak F#" by @simontreanor.bsky.social #fsharp simontreanor.dev/articles/Fun...

F# folk, with @nojaf.com we've added support for generating llms.txt to the fsdocs tool that's widely used by the F# community.

We'll release it soon but if you have a chance to take it for a spin before please do.

github.com/fsprojects/F...

#fsharp

It is not a data format, but MCP TP was an interesting idea bsky.app/profile/jkon...

Using GitHub Agentic Workflows "Repo Assist" automated repo assistant, I was able to

1. Clear all the lingering technical debt off the community library FSharp.Control.AsyncSeq today

2. Release a new version 4.0.0 with a major compat feature

github.com/fsprojects/F...

bsky.app/profile/did:...