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URL: https://www.nuget.org/packages/Fable

⇱ NuGet Gallery | Fable 5.3.0



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 Fable 5.3.0 

dotnet tool install --global Fable --version 5.3.0
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 5.3.0
This package contains a .NET tool you can call from the shell/command line. 
#tool dotnet:?package=Fable&version=5.3.0
The NuGet Team does not provide support for this client. Please contact its maintainers for support. 
nuke :add-package Fable --version 5.3.0
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

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. 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 Versions Compatible and additional computed target framework versions.
.NET net10.0 net10.0 is compatible.  net10.0-android net10.0-android was computed.  net10.0-browser net10.0-browser was computed.  net10.0-ios net10.0-ios was computed.  net10.0-maccatalyst net10.0-maccatalyst was computed.  net10.0-macos net10.0-macos was computed.  net10.0-tvos net10.0-tvos was computed.  net10.0-windows 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
5.3.0 305 6/16/2026
5.2.0 707 6/11/2026
5.1.0 1,251 5/28/2026
5.0.0 14,760 4/21/2026
5.0.0-rc.7 854 4/7/2026
5.0.0-rc.6 376 3/31/2026
5.0.0-rc.5 1,725 3/20/2026
5.0.0-rc.4 158 3/19/2026
5.0.0-rc.3 770 3/10/2026
5.0.0-rc.2 360 3/3/2026
5.0.0-rc.1 317 2/26/2026
5.0.0-alpha.24 1,356 2/13/2026
5.0.0-alpha.23 707 2/3/2026
5.0.0-alpha.22 6,438 12/26/2025
5.0.0-alpha.21 4,032 12/15/2025
5.0.0-alpha.20 1,586 12/8/2025
5.0.0-alpha.19 626 12/4/2025
5.0.0-alpha.18 782 12/3/2025
5.0.0-alpha.17 826 11/27/2025
4.29.0 19,020 2/13/2026
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### 🚀 Features

* *(beam)* Add !^ erased-cast operator to BeamInterop (#4659) ([206776b](https://github.com/fable-compiler/Fable/commit/206776bfcc7068f9953bf6e70aafcc24c4082248))

### 🐞 Bug Fixes

* Add type specifiers to interpolated strings (#4646) ([512ae4d](https://github.com/fable-compiler/Fable/commit/512ae4d1901d6ed3c4c10bb5b4f99e73c49a2056))
* *(all)* Cli fable clean command crash when output directory doesn't exist (#4651) ([de379e8](https://github.com/fable-compiler/Fable/commit/de379e8f189257135498c4932f46815ef179d87e))
* *(all)* Align `invalidArg` error message with .NET format (#4662) ([e672eb7](https://github.com/fable-compiler/Fable/commit/e672eb7ff6c38e15bada7520142024456b0dbb61))
* *(beam)* Preserve element type through Option.Value for interface dispatch (#4661) ([e5521b6](https://github.com/fable-compiler/Fable/commit/e5521b63f70ea25c3b42447ef4327f95245002da))
* *(python)* Emit wildcard default for union or-patterns (#4649) (#4653) ([c96f0ec](https://github.com/fable-compiler/Fable/commit/c96f0ecfe40d6be0fe8d95766ba279c3be4f6f7b))

<strong><small>[View changes on Github](https://github.com/fable-compiler/Fable/compare/15eb83ed36657f75073fb0e1b4cac677e24fc9bb..477b8c693d948f74d8d2d5c38ac4d8e1f9287a51)</small></strong>