Fable 5.16.0

.NET 10.0 This package targets .NET 10.0. The package is compatible with this framework or higher. 
dotnet tool install --global Fable --version 5.16.0
This package contains a .NET tool you can call from the shell/command line. 
dotnet new tool-manifest
                    


                            if you are setting up this repo
                        

                    

                
dotnet tool install --local Fable --version 5.16.0
This package contains a .NET tool you can call from the shell/command line. 
#tool dotnet:?package=Fable&version=5.16.0
                    


                    

                
nuke :add-package Fable --version 5.16.0

Fable: F# |> JS

Nuget Build Join the chat at https://gitter.im/fable-compiler/Fable

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Fable is an F# to JavaScript compiler powered FSharp Compiler Services, designed to make F# a first-class citizen of the JavaScript ecosystem. Check the website for more information and if you find the project useful, don't forget to give us a star!

Fable actually uses a fork of FCS with a few tweaks. Binaries are in lib/fcs folder. See this PR for more info.

Getting started

Check this page.

Building

Requirements

Use VSCode Dev Container

You can use VSCode Dev Container to get a preconfigured environment both with requirements and VSCode extensions.

  1. You need to have docker installed and running.
  2. Install the Dev Container extension in VSCode
  3. Open the project in VSCode and click on the green button in the bottom left corner.
Use your machine

Make sure the following requirements are installed in your system:

Build

Run ./build.sh or ./build.cmd to see the build options.

When using VSCode, you can also run the build tasks from the command palette (Ctrl+Shift+P) by typing Run Task and selecting the task you want to run.

We also configured several debug configurations that you can use from the debug panel (Ctrl+Shift+D). This is useful as you can attach the debugger to the Fable compiler process to check what's going on.

Contributing

Just by using Fable you're already contributing! You can help the community a lot by sharing examples and experiences in your personal (or Fable's) blog and/or by editing the Fable Resources page.

Send bug reports (ideally with minimal code to reproduce the problem) and feature requests to this GitHub repository. To interact with the community you can use the Gitter chat but please note maintainers are not checking the chat regularly.

If you are up to contribute a fix or a feature yourself, you're more than welcome! Please send first an issue or a minimal Work In Progess PR so we can discuss the implementation details in advance.

List of changelogs

Product Compatible and additional computed target framework versions.
.NET net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

This package has no dependencies.

Version Downloads Last Updated
5.16.0 481 9/3/2026
5.15.0 1,391 8/25/2026
5.14.0 181 8/25/2026
5.13.0 18,818 7/24/2026
5.12.0 505 7/23/2026
5.11.0 1,330 7/17/2026
5.10.0 756 7/16/2026
5.9.0 4,460 7/15/2026
5.8.1 591 7/14/2026
5.8.0 949 7/11/2026
5.7.0 472 7/9/2026
5.6.0 1,545 7/5/2026
5.5.0 1,591 6/30/2026
5.4.0 2,072 6/24/2026
5.3.0 2,218 6/16/2026
5.2.0 2,515 6/11/2026
5.1.0 2,563 5/28/2026
5.0.0 37,048 4/21/2026
5.0.0-rc.7 1,428 4/7/2026
5.0.0-rc.6 421 3/31/2026
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### 🚀 Features

* *(all)* Quotations: DerivedPatterns, and captured locals as Value nodes (#4919) ([fae5093f](https://github.com/fable-compiler/Fable/commit/fae5093f2801195e865adf1acfaec63f38bbf973))
* *(python)* Support quotation derived patterns (#4928) ([f6d939a1](https://github.com/fable-compiler/Fable/commit/f6d939a14c67010cb6cc02c7994d6f56c7156dab))
* *(rust)* Observables, Events and IEnumerable (PR 6 of 7 Rust improvements) (#4789) ([20175eea](https://github.com/fable-compiler/Fable/commit/20175eea841adf14ed57c0068458fad591c8d5f4))
* *(rust)* System.Uri (PR 7 of 7 Rust improvements) (#4790) ([8a551bc9](https://github.com/fable-compiler/Fable/commit/8a551bc9b2433035fc704dffc639e5f031ca7593))

### 🐞 Bug Fixes

* Preserve project FSharp.Core reference (#4924) ([1289360a](https://github.com/fable-compiler/Fable/commit/1289360a11398387712df2769069b9c949659966))
* Report Fable's own logs from the Fable.Compiler API (#4923) ([0775c604](https://github.com/fable-compiler/Fable/commit/0775c604d319d230796da0d47817428b1da8fece))
* *(all)* Emit instance calls for virtual methods inherited from Object (#4926) ([2fb535a7](https://github.com/fable-compiler/Fable/commit/2fb535a7cd35cef501c56684f205e2dffa3c36e6))
* *(all)* Allow private inline functions to use private values (#4915) ([b0740ba9](https://github.com/fable-compiler/Fable/commit/b0740ba95859a80e7add07f21e2fc81a31c00853))
* *(python)* Emit Python names for float32 specials (#4938) ([b4c45a93](https://github.com/fable-compiler/Fable/commit/b4c45a93385f249a8586789037b0af18005786e9))
* *(python)* Compare nested options of different depth (#4940) ([5afa2948](https://github.com/fable-compiler/Fable/commit/5afa2948edd221b64aa14553509ba96028d064c5))
* *(rust)* Observables and Events cleanup (#4908) ([ca165045](https://github.com/fable-compiler/Fable/commit/ca165045703797f0558da4bc6e06cbea7af231de))
* *(rust)* Support `string` on a tuple (#4916) ([510c8a43](https://github.com/fable-compiler/Fable/commit/510c8a43c159ffb9d7d7bdc4e2ee16b84b80b28e))
* *(rust)* Decimal culture overloads, and mutables assigned in try/finally (#4918) ([58402471](https://github.com/fable-compiler/Fable/commit/584024712450d333193baddc239db977af05bd54))
* *(rust)* Let a string be enumerated (#4921) ([395c152b](https://github.com/fable-compiler/Fable/commit/395c152bd4ef0c26af7a4ff48ed44c728aa73d25))
* *(rust)* Async perf: stop the async runtime sleeping, and add Parallel (#4920) ([88135b90](https://github.com/fable-compiler/Fable/commit/88135b90382f63bd40d58dfc75c4f915cc4bb868))
* *(rust)* F# exceptions, non-exhaustive matches and obj type tests (#4917) ([28da1d76](https://github.com/fable-compiler/Fable/commit/28da1d764e63c39b96ca20e94d9a08786b3c9052))
* *(rust)* Wait for the other files instead of sleeping before the last one. (#4927) ([d329a823](https://github.com/fable-compiler/Fable/commit/d329a823298af9f934058f245d54155ccb555a69))
* *(rust)* Cleanup AsyncBuilder and TaskBuilder (#4936) ([3e6bc9bd](https://github.com/fable-compiler/Fable/commit/3e6bc9bd4d4337e901cc748f35df2a5933f0ba55))
* *(rust)* Fix interface casting, move reflection into declarations (#4939) ([04299157](https://github.com/fable-compiler/Fable/commit/042991572969e1864a160b0a0145b1d59bc77236))
* *(rust)* Support reflection for no_std (#4941) ([bf694309](https://github.com/fable-compiler/Fable/commit/bf694309ae5dbc6bb546d9acc4d091f5e35fe330))

<strong><small>[View changes on Github](https://github.com/fable-compiler/Fable/compare/b517d52df145ee30d1d3bd7e20fded1a9003ac54..bf694309ae5dbc6bb546d9acc4d091f5e35fe330)</small></strong>