Sergey Tihon's Blog

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

Microsoft News

• Announcing .NET 11
• F# in .NET 11 – Release Notes
• What’s New in Rider 2026.3
• .NET and .NET Framework November 2026 servicing updates
• Announcing Visual Studio 2026 LTSC 18.11 – Visual Studio Blog
• Copilot in Visual Studio Just Got a Major Upgrade – Visual Studio Blog
• Bring Your Own Model is now generally available in Visual Studio – Visual Studio Blog
• Announcing PowerShell 7.7 GA Release – PowerShell Team

🚀 Announcing .NET 11!

This release brings C# 15 union types, faster developer tools, hundreds of performance improvements, and new capabilities for web, mobile, desktop, and AI apps.

See what’s new and get started: https://t.co/GEpvJqG3Vd

— .NET (@dotnet) November 10, 2026

Videos

• Cultures of Programming by Tomas Petricek
  • 1. History of programming and why it matters today
  • 2. Hackers, engineers, managers, mathematicians and humanists
  • 3. The invention of a programming language
  • 4. Mathematical science of computation and structured programming
  • 5. Fundamental limits of proofs of programs
• .NET Conf 2026 – Day 1
• .NET Conf 2026 – Day 2
• .NET Conf 2026 Keynote – .NET 11 Launch
• What’s new in C#
• C# Dev Kit 11: Faster Foundations for .NET Development—and What Comes Next
• .NET Runtime vNext: Memory Safety and Runtime Async
• More Processes, More Problems – how to speed up your builds with Multithreaded MSBuild
• Blazor Server in .NET 11: Fast, resilient, and scalable
• Modern web development with ASP.NET Core & Blazor in .NET 11
• Building the future of agentic UI with Blazor
• What’s new in the MCP C# SDK
• System.Text.Json in .NET 11
• Moving `dotnet` Ahead (of Time)!
• The .NET AI Stack: What’s New, What’s Next, and How It Fits Together
• What’s New in Aspire for .NET Developers
• C# File-based apps turned up to 11!

Blogs

• Study notes: automatic differentiation (part 3) · Mathias Brandewinder blog
• ThreeBody and Rational Dimensions – Clef Programming Language

F# Interactive, next to your code.
▶ Run a snippet and see the result inline.
▶ Run to here runs everything above it.
New in Guide Coding 1.0.18 🎬 #fsharp https://t.co/NbUipAewAS pic.twitter.com/zWXvmI4u8T

— Novian.Works (@OnurGumusDev) November 8, 2026

Highlighted projects

• giraffe-fsharp/Giraffe: A native functional ASP.NET Core web framework for F# developers.
• fsprojects/Paket: A dependency manager for .NET with support for NuGet packages and Git repositories.
• soweli-p/FsiX: A better REPL for F# with project/solution support and hot reloading.
• Neftedollar/FsLangMCP: Semantic F# for AI coding agents (Claude Code · Cursor · Copilot · Codex) — an MCP server that gives LLMs real FCS/FSAC compiler intelligence (find, check, types, rename) instead of grepping F#.
• GarryPatchett/QuickData.FSharp: Public repository for the QuickData.FSharp packages.
• GarryPatchett/QuickVectors.FSharp: Public repository for the QuickVectors.FSharp packages.

New Releases

• fable-compiler/Fable 5.27.0
• fsprojects/Paket 12.0.0
• giraffe-fsharp/Giraffe v8.4.0
• soweli-p/FsiX v0.1.3
• Neftedollar/FsLangMCP v0.20.0
• G-Research/fsharp-analyzers v0.27.0
• ASC-Community/AngouriMath v2.7.0
• kerams/EpubFs v0.5.1

Rider 2026.3 is out, and it's 🔥🔥 Day-one .NET 11 support, inc. C# 15 & Runtime Async debugging.🔥 JetBrains Air: Run your coding agents in the IDE & review changes in one place.🔥 New Home screen: Edit files, use terminal, or attach the debugger w/o opening a solutionTry it now: jb.gg/rd-263-bs

— JetBrains Rider (@rider.jetbrains.com) 2026-11-10T19:10:30.630Z

That’s all for now. Have a great week.

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

• Serde.FS 1.0 is out
• FSharp.CloudEdge

Microsoft News

• Get Ready for .NET Conf 2026!
• Help Shape the Future of .NET: Take the 2026 .NET Developer Survey
• Delivering Skills in NuGet packages
• Modernize your .NET apps for Windows Arm64 with GitHub Copilot
• GitHub Copilot in JetBrains Air: Plugin vs. Agent
• Publish Visual Studio Marketplace extensions securely with Trusted Publishing
• Intelligent Terminal Sidebar Brings New Capabilities

Videos

• My F# Server Is #2 Out of 98 in the $12 Server Challenge – YouTube
• F# basics: let bindings, immutability and expressions – YouTube
• Getting Started with SharpLsp | F# & C# in VS Code – YouTube
• F# Programming in VS Code | SharpLsp .NET Language Support – YouTube

Blogs

• Study notes: automatic differentiation (part 3) · Mathias Brandewinder blog
• Kentaro Inomata: Effect handlers in F#, despite no delimited continuations, GADTs, HKTs or row polymorphism. Ported from Koka, Effekt, Unison, OCaml, Polysem

Highlighted projects

• dotnet-websharper/core: WebSharper – Full-stack, functional, reactive web apps and microservices in F# and C#
• serde-fs/Serde.FS: A deterministic, reflection‑free serialization and RPC platform for F#. Powered by Serde‑style source generation for .NET and (soon) Fable.
• cmeeren/BatchIt: Call batched functions as normal functions
• l0ng-ai/openidea: The IDE you know, rebuilt in Rust.

For those of you who work with #fsharp and #dotnet and want to have a good @cloudflare-dev.bsky.social experience, FSharp.CloudEdge was just bumped to 0.1.1 with Pi Agents support.

— Braidpoint (@braidpoint.bsky.social) 2026-10-29T14:18:24.314Z

New Releases

• Fable 5.27.0
• WebSharper 10.1.10.687
• SQLProvider 1.5.30
• fsprojects/fantomas v8.1.1
• dotnet-fsharplint 0.27.2
• SageFs 0.6.938
• BatchIt 2.0.0
• Serde.FS 1.0.1

That’s all for now. Have a great week.

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

• F# Advent Calendar in English 2026
• Paket support on renovate merged 🎉

F# Advent Calendar in English 2026 #fsharp #FsAdvent sergeytihon.com/2026/10/25/f…

— Sergey Tihon 🦔🦀 (@sergeytihon.com) 2026-10-25T08:56:57.400Z

Microsoft News

• Blazor Welcomes Open-Source Contributions from Syncfusion
• Blazor Welcomes Open-Source Contributions from Infragistics
• .NET October 2026 Out-of-Band Security Updates
• Visual Studio October Update – Compare Commits to Your Code, Resolve Conflicts in Bulk, Keep Coding – Visual Studio Blog
• Publish Visual Studio Marketplace extensions securely with Trusted Publishing – Microsoft for Developers
• Introducing the Microsoft Copilot harness in Foundry Agent Service | Microsoft Foundry Blog
• Visual Studio October Update – Compare Commits to Your Code, Resolve Conflicts in Bulk, Keep Coding – Visual Studio Blog

Videos

• Everything announced at GitHub Universe 2026: opening keynote recap – YouTube
• .NET + Foundry, Better Together: Decision Models in Action – YouTube
• Blazor Community Standup: Free Syncfusion Toolkit for Blazor
• Blazor Community Standup: Free Blazor components with Ignite UI
• .NET AI Community Standup: Data Ingestion with .NET

Blogs

• F# Advent Calendar in English 2026 – Sergey Tihon’s Blog

Highlighted projects

• plotly/Plotly.NET: Interactive graphing library for .NET programming languages :chart_with_upwards_trend
• fsprojects/FSharp.CloudEdge: A complete binding set for Cloudflare Services in F#
• CompositionalIT/farmer: Repeatable Azure deployments with ARM templates – made easy!
• AngelMunoz/DevNull.Client: A client and library for https://dev-null.sh

New Releases

• Fable 5.26.0
• Plotly.NET 6.0.0
• Farmer 1.9.36
• G-Research.FSharp.Analyzers 0.26.0
• SqlHydra.Query 5.1.1
• WebSharper 10.1.9.686
• Fable.Lit 2.0.0
• Sharpino 6.2.7

⚡️ Fable 5.25.0 is out!14 perf improvements for JS/TS:• Union hash 36 → 5 ns, 0 alloc• Dictionary lookup 39 → 30 ns, 0 alloc• Record hash 15-20% faster• List ops 15-30% fasterContributors aligned behavior with .NET. Thanks goswinr, Leo Conforti, cabboose!#fsharp #fablecompiler

— Maxime (@mangelmaxime.bsky.social) 2026-10-29T19:02:26.752Z

That’s all for now. Have a great week.

Welcome to F# Weekly,

A roundup of F# content from this past week:

Microsoft News

• Bring Your Own Model to the GitHub Copilot SDK with C#
• Get Your .NET MAUI App Ready for Xcode 27
• Compare today’s code with an earlier commit – Visual Studio Blog
• Announcing TypeScript 7.1 Beta – TypeScript
• Visual Studio Code 1.143

Videos

• Introducing F#: Bringing the Simplicity of ML Programming to the World of .NET – Don Syme – 2004/12 – YouTube
• Gien Verschatse – Playing nice together how to use F# in a brownfield project – NewCrafts 2017 – YouTube
• Evelina Gabasova – Machine learning The F# way – NewCrafts 2015 – YouTube
• Krzysztof Cieslak – Hacking F# in JS ecosystem – NewCrafts 2017 – YouTube
• Mathias Brandewinder – Serverless F# with Azure Functions – NewCrafts 2017 – YouTube
• $12 Server vs Expert Developers

Look what I've found #fsharphttps://t.co/dwEQ25N4Fj

Courtesy of @_h0x0d_

— Vlæd Zá 🤡 (@vzarytovskii) October 23, 2026

Blogs

• Study notes: automatic differentiation (part 2) · Mathias Brandewinder blog
• Event Sourcing: Is our Projection Code fast enough? – Urs Enzler
• How does Fable 5.1 hide messages in images? — LessWrong

Highlighted projects

• fsprojects/fantomas: FSharp source code formatter
• fscheck/FsCheck: Random Testing for .NET
• giuliohome/DnsAutoSwitch: Windows service that keeps your LAN DNS on a primary server (AdGuard Home, Pi-hole) while it answers, and on a fallback otherwise. F#, .NET 10.
• AngelMunoz/Navs: A set of libraries that allow Router-like experiences for general purpose F# Apps

Fable 5.22 is out. Since 5.16:- Opt-in Temporal dates / times for JS- Implicit conversion to U2..U9- Cold builds: project cracking 7.7s to 2.3s 🏎️- Compilation up to 2.9x faster (server GC + JIT tuning) 🎉- Faster watch: incremental inline exprs- Many BEAM and Rust fixes#fsharp #fablecompiler

— Maxime (@mangelmaxime.bsky.social) 2026-10-20T09:11:44.122Z

New Releases

• Ionide 8.0
• Fable.Core 5.6.0
• SageFs 0.6.927
• Fable 5.24.0
• fsharp-analyzers 0.41.0
• Farmer 1.9.34

A Free .NET Profiler for VS Code: CPU, Memory and Leaks in C# and F#buff.ly/Et9QscC#dotnet #vscode #csharp #fsharp #profiler #debugging #devtools

— Alvin Ashcraft (@alvinashcraft.com) 2026-10-19T18:01:22.680Z

That’s all for now. Have a great week.

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

• F# in .NET 11 RC 2 – Release Notes
• Performance improvements in the F# 11 compiler

Microsoft News

• Introducing dotnetup: A toolchain manager for .NET
• Announcing .NET 11 Release Candidate 2
• Durable Task in the Real World: What Problems Does It Actually Solve?
• Stop waiting on a failed build – Visual Studio Blog
• What’s new in Microsoft Foundry | September 2026 | Microsoft Foundry Blog

Wow, what is an update: F# in .NET 11 RC 2 #fsharp github.com/dotnet/core/…

— Sergey Tihon 🦔🦀 (@sergeytihon.com) 2026-10-16T07:31:35.927Z

Videos

• .NET Unboxed: .NET 11 Release Candidate 2
• Houston Haynes – The Clef Programming Language – A Ship of Theseus Story – YouTube
• .NET + Foundry, better together
• .NET AI Community Standup: Build agentic experiences with the Blazor AI Components – YouTube

Blogs

• Event Sourcing: A close look at the projector for values – planetgeek.ch

Many #fsharp goodies inside, again.

Particularly happy about the allocation and kept-memory improvements. Deserved a separate sub post – https://t.co/ZR9IHfna42 .

Especially held memory was a stream of great work by @auduchinok – thank him in these hard RAM-economy times :-)) https://t.co/ANSIum7Mzi

— Tomáš Grošup (@tomasgrosup) October 14, 2026

Highlighted projects

• AngelMunoz/MVUish.Avalonia – lightweight, performant Model-View-Update (MVU) library for Avalonia, designed for both C# and F#.
• EluciusFTW/SpectreTuff: A thin, opinionated wrapper around Spectre.Tui in F#.
• WillEhrendreich/SageFs: Sage Mode for F# development — REPL with solution or project loading, Live Testing for FREE, Hot Reload, and session management.
• TheAngryByrd/fsharp-skills – Reusable instructions for AI agents working on F# code

New Releases

• Fable 5.22.0
• NBomber 6.7.1
• SageFs 0.6.908
• FsUnit 8.0.0
• Expecto 11.1.1
• Thoth.Json 10.5.2
• Farmer 1.9.33
• WebSharper 10.1.6.678
• MVUish.Avalonia 1.0.1

That’s all for now. Have a great week.

Welcome to F# Weekly,

A roundup of F# content from this past week:

News

• Paket 11
• Firelight: Web Components for F#

Microsoft News

• A faster, lighter C# Dev Kit
• Build Agentic UI with the new Blazor AI components
• UWP and WinUI 3 apps: UI testing with MSTest
• Adding persistence to the Aspire dashboard | Aspire Blog
• Bringing Native AOT to the Aspire dashboard | Aspire Blog
• UWP and WinUI 3 apps: UI testing with MSTest – .NET Blog
• Introducing WinDbg MCP: Debug with natural language, grounded in evidence – Performance and Diagnostics
• From Spec-First to Enterprise-Ready: Extending GitHub Spec Kit – Microsoft for Developers

New release of Paket (/! last version with legacy mode) github.com/fsprojects/P… #fsharp

— (@fpellet.bsky.social) 2026-10-05T17:14:00.482Z

Videos

• Felienne Hermans – Using F# and genetic programming to play computer bridge – NewCrafts 2016
• Blazor Community Standup: Build agentic experiences with the Blazor AI Components
• .NET MAUI Community Standup: Inside GnollHack: Cross-Platform Game Development with .NET MAUI
• Let’s Learn GitHub Copilot SDK – .NET Edition

Blogs

• Study notes: automatic differentiation (part 1) – Mathias Brandewinder
• Event Sourcing: fun with bi-temporal timelines – Urs Enzler
• We Shape Our Tools: Why Functional Programming? – DEV Community

Highlighted projects

• roboz0r/Firelight: Web Components for F#. Powered by Lit · GitHub
• shayanhabibi/Ranvier: Fine-grained reactive computation for .NET · GitHub

New Releases

• Paket 11.0.0
• NBomber.Contracts 6.4.0
• fantomas 8.0.8
• SageFs 0.6.906
• Expecto 11.1.1
• Pulsar.Client 3.19.8
• Fable 5.20.0
• Farmer 1.9.33
• SwaggerProvider 4.2.1
• Prime 11.5.5
• Fabulous 10.0.3
• SqlHydra.Query 5.1.0
• Felicity 0.25.0
• Funogram 3.0.6
• Dmx.GslCore 0.6.0
• Xake 3.5.0.23
• telplin 0.17.1
• Fesh 0.34.0
• Fuaran.Core.Wire 0.36.0
• PersistedConcurrentSortedList 10.1.401
• Swate.Components 2.5.0
• Oxpecker.Htmx 4.1.0
• TestPrune.Core 13.3.3
• FsLangMcp 0.19.0
• Mibo.Templates 6.0.0
• fsharp-refactor 0.8.42
• CommandTree 0.13.0
• FsLiveDocs 0.13.0
• Axial 0.10.0
• Fuuga 1.0.36
• Earcut 3.2.41
• ConstructStyleSheetsPolyfill.Unofficial 2.21.3
• zest 0.9.0
• Lit.Server.Unofficial 2.21.3
• Falco.UnionRoutes 0.3.5
• Numerics.NET.FSharp 10.8.0
• FunStripe.Core 3.0.0
• SvgPath 3.0.0
• VersionControlService.Abstractions 0.2.1
• ArgyleConcepts.FSharp.Actor 1.0.0
• Beardmouse.Thoth.Json.Core 0.9.1
• Frostlake.FSharp 0.2.0
• FsForge 0.0.1
• Scowalt.NoCommentsAnalyzer 0.1.2
• tsr-StackedFlow 1.0.0

Another finding of the F# discord"Firelight: Web Components for F#"> Firelight is a set of F# bindings for Lit, compiled with Fableroboz0r.github.io/Firelight/#dotnet #fsharp #webdev

— Angel Munoz (@tunaxor.me) 2026-10-05T03:08:09.157Z

That’s all for now. Have a great week.

Welcome to F# Weekly,

A roundup of F# content from this past week:

Microsoft New

• Build Agentic UI with the new Blazor AI components
• Aspire 13.6: Your dashboard gets memory | Aspire Blog
• Bringing rich terminal experiences to Aspire | Aspire Blog
• Visual Studio September Update – Power Your Workflow with Your Model – Visual Studio Blog
• Get started with the GitHub Copilot app: a free, hands-on course – Microsoft for Developers

For #fsharp, #dotnet, #fablecompiler and @cloudflare-dev.bsky.social folks there's a new project for building agentic AI in the cloud. We're excited to make this a community project that anyone can use, modify, profit and contribute! It's still early days yet… fsprojects.github.io/FSharp.Cloud…

— Braidpoint (@braidpoint.bsky.social) 2026-09-30T12:26:14.672Z

Videos

• Blazor Community Standup: Build agentic experiences with the Blazor AI Components
• Let’s Learn GitHub Copilot SDK – .NET Edition
• .NET AI Community Standup: Interview Coach Evolves: MAF + GitHub Copilot SDK
• .NET MAUI Community Standup: Inside GnollHack: Cross-Platform Game Development with .NET MAUI – YouTube
• How to Create an F# Project in Visual Studio – Hacked

Blogs

• Event Sourcing: two ways to enable accept/reject workflows – Urs Enzler

Highlighted projects

• fsprojects/FSharp.CloudEdge: A complete binding set for Cloudflare Services in F#
• shayanhabibi/Ranvier: Fine-grained reactive computation for .NET
• goswinr/Fesh: F# scripting editor for Windows
• teo-tsirpanis/Farkle: The most advanced LR(1) parsing library for C# and F#
• EluciusFTW/tuisweeper: This is an implementation of the classic MineSweeper in the terminal written in F# using SpectreTuff

New Releases

• Fable.Core 5.3.0
• fantomas 8.0.6
• SageFs 0.6.883
• Pulsar.Client 3.19.6
• Farmer 1.9.31
• FsLexYacc.Runtime 13.0.0
• Fabulous 10.0.3
• SqlHydra.Query 5.1.0
• FSharp.Interop.Dynamic 7.0.0
• Myriad.Core 1.1.0

That’s all for now. Have a great week.

Welcome to F# Weekly,

A roundup of F# content from this past week:

Microsoft News

• Microsoft is updating its author-signing certificate starting September 23, 2026
• AG-UI Protocol now has a first-class .NET SDK
• Creating a memory dump in C#

New #oxpecker beta release! #fsharpmedium.com/@Lanayx/oxpe…

— Vladimir Shchur (@lanayx.bsky.social) 2026-09-27T01:17:23.418Z

Videos

• .NET Data Community Standup: You won’t believe what Chris is doing with EF interceptors 🤯
• Production Ready: Observability, Governance and Deployment – YouTube

Blogs

• Oxpecker 3. As you might have guessed from the… | by Vladimir Shchur | Sep, 2026 | Medium

Highlighted projects

• fsprojects/FsLexYacc: Lexer and parser generators for F#
• adz/FsLiveDocs: F# Live Docs generator – api docs, live snippets, x-refs, markdown pages, FSI transcript execution and snapshot tested, and AI-ready output. If the examples don’t compile, the build fails.
• byzantine-systems/automata: A typed state-machine library for F# (and .NET), with Polly integrations and PostgreSQL/SQLite as an optional durable store

New Releases

• Fable 5.18.0
• fantomas 8.0.5
• FsLexYacc 13.0.0
• Equinox.Tool 4.1.4
• FSharp.Analyzers.SDK 0.39.2
• Myriad 1.1.0
• WebSharper.FSharp 10.1.6.677
• FsLiveDocs 0.9.0
• Fable.Lit.Dsl 2.0.0
• ByzantineSystems.Automata.Core 0.5.0
• FSharp.HotChocolate 1.0.4
• FS-GG/FsQuint v0.1.0
• krymtkts/SnippetPredictor v0.8.0

Some screenshots from my Stylised-first F# #fsharp game engine. #gamedevhttps://t.co/RDZOx7DWSI pic.twitter.com/h9OY6VOOoJ

— Adrian Sieradzki (@adisiera) September 25, 2026

That’s all for now. Have a great week.