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
"Pure-F# training/inference workflow around Qwen3-4B with NVFP4" by @ingted.bsky.social #fsharp github.com/ingted/Qwen3...
Seen your post, asked codex to implement a type provider for FScript... and boom, 40 minutes later it's done. What a world we live in.
github.com/MagnusOpera/...
Ha yes, @tarmil.mastodon.tarmil.fr.ap.brid.gy did a bridge for that github.com/Tarmil/FShar...
That’s strange. Codex is happy to write F# and stay in the line.
Hey you can try FScript too 😇 REPL, vscode extension, purely interpreted, embeddable & no .net sdk !
github.com/MagnusOpera/...
I just miss an LSP and syntax coloration for VSCode now.
Probably it's the next thing to come 😇
For the curious, here are the extensions written for Terrabuild in FScript.
github.com/MagnusOpera/...
fscript is a demo host to play with the language but the real thing is to embed the language in your .net app !
For example, Terrabuild has been successfully adapted to use FScript for extensions: no more .net sdk dependency and no need to compile extensions with F#. Just write a script now !
FScript has grown a lot ! It's now a fully fledge embeddable functional language with nice features:
- tuples, records, unions, lists, options, map
- great matching ergonomics
- standard library for types
- embeddable with clear sandbox model
Enjoy !
Link to tutorial: github.com/MagnusOpera/...
My goal is to remove dependencies on .net SDK and to allow script execution in a sandboxed environment. I bet there are a lot of use cases for that - at least I have few ideas for that 🙂
It misses a lot to be call a mini-F#. It’s just inspired by F# and goals are different of course. No obj support, no interface, limited types support. Pure functional lang with no mutability. Side fx (print, read file…) are host responsibilities.
Integration in Terrabuild is mostly done for extensions! Next is to focus on extension distribution (local and http) and documentation generator. Needless to say this will be a major improvement for Terrabuild. Really happy about FScript capabilities. Hope you will like it too !
- Built-in support for list, option, map, records with support runtime library.
- Pattern matching covers list-cons, tuple, option, record, and union-case patterns.
- Extensibility model is host-first and typed.
I'm really happy with current state of FScript:
- F#/ML-style scripting focused on safe embedding: strong type inference, explicit host extensibility, and sandboxed execution.
- Hindley–Milner inference with optional parameter annotations.
github.com/MagnusOpera/...
😅 haha you are too fast @sergeytihon.com
I bet you have an automated repositories scanner 😃
It's alpha software of course - developed in 1 day with Codex but it has quite great test coverage. And it's working pretty well indeed. Check the examples ! That's the incredible story 😊
I'm planning to use FScript to replace extensions in Terrabuild: using F# scripts requires installation of .net SDK - it's a bit heavy so I need to remove this dependency. FScript will also allow execution sandboxing. In next weeks, Terrabuild will have great security and full extensibility. Nice.
Trend is to generate a compiler using LLM... So here is my contribution: FScript, an embeddable #fsharp lang inspired interpreter. Entirely developed with Codex, no shame 😃
Execution is sandboxed and extensible, also support structural record annotation (think Typescript).
github.com/MagnusOpera/...
This is how I've implemented string interpolation in Terrabuild last year - it's easy once you understand lexer needs to be context sensitive (kind of aha moment) - at least with FsLexYacc. Link to implementation in #fsharp, as there are few simple materials on the topic.
github.com/MagnusOpera/...
Parenthood is hard 🙂
It's been a while I shall have completed FSharp.MongoDB - but literally had no time to spend on fixing a stack overflow.
Now it is feature complete and fully supports NRT 🎉
Enjoy F# + MongoDB ! #fsharp #mongodb
github.com/fsprojects/F...
It’s not fair to compare list with array. Until we have RFC 1094, I do not think there is much to brag about.
I love ChatGPT I must say for the brainstorming and everything I can learn from. It’s amazing how much “yes but” is encouraging to explore new ideas/pov just for fun without judgment. Can relate the “private” labeling 🤗
I love when ChatGPT writes "production-ready" code 😏
the return of the ini files 😱
Man, why the fuck are you hanging there ? Come back managing F# and why not C#.
GitHub merge queues are a great tool but such a pita to configure and terribly buggy. Go in Hell @github.com 🤬
The best thing I did last week was to disable copilot. For PR it’s useful but as a tool to get things done in IDE, what a waste of time. I just want smart completion based on my types, not this shit that understands nothing to what I’m doing. Unfortunately it seems IntelliSense is no more.
