Fable 4.25.0

There is a newer prerelease version of this package available.
See the version list below for details.
dotnet tool install --global Fable --version 4.25.0
                    
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 4.25.0
                    
This package contains a .NET tool you can call from the shell/command line.
#tool dotnet:?package=Fable&version=4.25.0
                    
nuke :add-package Fable --version 4.25.0
                    

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 net6.0 is compatible.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  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
5.0.0-alpha.14 318 7/25/2025
5.0.0-alpha.13 1,816 5/4/2025
5.0.0-alpha.12 1,419 3/14/2025
5.0.0-alpha.11 760 3/3/2025
5.0.0-alpha.10 1,028 2/16/2025
5.0.0-alpha.9 1,132 1/28/2025
5.0.0-alpha.8 167 1/27/2025
5.0.0-alpha.7 406 1/23/2025
5.0.0-alpha.6 140 1/23/2025
5.0.0-alpha.5 802 1/9/2025
5.0.0-alpha.4 199 1/3/2025
5.0.0-alpha.3 605 12/18/2024
5.0.0-alpha.2 277 11/26/2024
5.0.0-alpha.1 135 11/24/2024
4.25.0 3,941 4/26/2025
4.24.0 28,856 11/19/2024
4.23.0 6,350 10/28/2024
4.22.0 9,965 10/2/2024
4.21.0 4,871 9/19/2024
4.20.0 4,040 9/4/2024
4.19.3 28,149 6/17/2024
4.19.2 464 6/13/2024
4.19.1 256 6/13/2024
4.19.0 1,903 6/10/2024
4.18.0 2,292 5/23/2024
4.17.0 13,853 4/23/2024
4.16.0 11,035 3/20/2024
4.15.0 1,023 3/18/2024
4.14.0 12,943 3/1/2024
4.13.0 4,834 2/20/2024
4.12.2 18,128 2/13/2024
4.12.1 837 2/13/2024
4.11.0 5,975 1/30/2024
4.10.0 18,905 1/25/2024
4.9.0 29,981 12/14/2023
4.8.1 1,621 12/12/2023
4.8.0 740 12/12/2023
4.7.0 9,001 12/6/2023
4.6.0 11,998 11/27/2023
4.5.0 25,872 11/7/2023
4.4.1 2,939 10/25/2023
4.4.0 20,117 10/24/2023
4.3.0 4,929 10/18/2023
4.2.2 4,192 10/14/2023
4.2.1 14,137 9/29/2023
4.1.4 52,547 5/16/2023
4.1.3 8,086 4/28/2023
4.1.2 4,059 4/22/2023
4.1.1 688 4/22/2023
4.1.0 1,106 4/18/2023
4.1.0-beta-001 697 4/16/2023
4.0.5 2,046 4/8/2023
4.0.4 2,302 4/4/2023
4.0.3 2,274 3/30/2023
4.0.2 1,144 3/27/2023
4.0.1 23,058 3/18/2023
4.0.0 6,821 3/14/2023
4.0.0-theta-018 55,196 11/19/2022
4.0.0-theta-017 645 11/16/2022
4.0.0-theta-016 797 11/13/2022
4.0.0-theta-015 619 11/5/2022
4.0.0-theta-014 427 10/31/2022
4.0.0-theta-012 1,219 10/14/2022
4.0.0-theta-011 997 10/4/2022
4.0.0-theta-010 447 9/28/2022
4.0.0-theta-009 446 9/28/2022
4.0.0-theta-008 479 9/22/2022
4.0.0-theta-007 420 9/21/2022
4.0.0-theta-006 464 9/18/2022
4.0.0-theta-005 397 9/17/2022
4.0.0-theta-004 520 9/14/2022
4.0.0-theta-003 359 9/12/2022
4.0.0-theta-002 315 9/11/2022
4.0.0-theta-001 402 9/9/2022
4.0.0-snake-island-alpha-026 433 9/8/2022
4.0.0-snake-island-alpha-025 411 9/6/2022
4.0.0-snake-island-alpha-024 557 9/2/2022
4.0.0-snake-island-alpha-023 365 8/30/2022
4.0.0-snake-island-alpha-021 945 8/21/2022
4.0.0-snake-island-alpha-020 449 8/14/2022
4.0.0-snake-island-alpha-019 506 7/31/2022
4.0.0-snake-island-alpha-018 354 7/30/2022
4.0.0-snake-island-alpha-017 391 7/27/2022
4.0.0-snake-island-alpha-016 358 7/26/2022
4.0.0-snake-island-alpha-015 326 7/26/2022
4.0.0-snake-island-alpha-014 369 7/25/2022
4.0.0-snake-island-alpha-013 352 7/25/2022
4.0.0-snake-island-alpha-012 487 7/12/2022
4.0.0-snake-island-alpha-011 355 6/23/2022
4.0.0-snake-island-alpha-010 363 6/3/2022
4.0.0-snake-island-alpha-009 317 6/2/2022
4.0.0-snake-island-alpha-008 342 6/1/2022
4.0.0-snake-island-alpha-007 363 5/25/2022
4.0.0-snake-island-alpha-006 321 5/24/2022
4.0.0-snake-island-alpha-005 352 5/23/2022
4.0.0-snake-island-alpha-004 328 5/21/2022
4.0.0-snake-island-alpha-003 347 5/20/2022
4.0.0-snake-island-alpha-002 319 5/19/2022
4.0.0-snake-island-alpha-001 350 5/11/2022
3.7.22 4,035 5/11/2023
3.7.21 293 5/11/2023
3.7.20 37,459 9/27/2022
3.7.19 598 9/27/2022
3.7.18 8,453 8/16/2022
3.7.17 6,989 7/21/2022
3.7.16 4,456 7/5/2022
3.7.15 994 6/29/2022
3.7.14 4,621 6/14/2022
3.7.12 3,845 5/27/2022
3.7.11 7,088 5/1/2022
3.7.10 845 4/29/2022
3.7.9 10,165 4/1/2022
3.7.8 1,811 3/24/2022
3.7.7 5,427 3/22/2022
3.7.6 3,009 3/16/2022
3.7.5 24,219 3/1/2022
3.7.4 1,000 2/25/2022
3.7.3 4,765 2/23/2022
3.7.2 1,439 2/22/2022
3.7.1 6,271 2/17/2022
3.7.0 8,781 2/7/2022
3.7.0-beta-015 1,294 1/26/2022
3.7.0-beta-014 383 1/24/2022
3.7.0-beta-012 434 1/18/2022
3.7.0-beta-011 368 1/14/2022
3.7.0-beta-010 332 1/14/2022
3.7.0-beta-009 340 1/12/2022
3.7.0-beta-008 321 1/11/2022
3.7.0-beta-007 350 1/11/2022
3.7.0-beta-006 333 1/11/2022
3.7.0-beta-005 354 1/7/2022
3.7.0-beta-004 334 1/5/2022
3.7.0-beta-003 396 1/4/2022
3.7.0-beta-002 320 12/28/2021
3.7.0-beta-001 335 12/20/2021
3.6.3 19,498 12/1/2021
3.6.2 8,858 11/26/2021
3.6.1 12,175 11/23/2021
3.6.0 1,783 11/19/2021
3.6.0-beta-003 467 11/17/2021
3.6.0-beta-002 317 11/15/2021
3.6.0-beta-001 344 11/14/2021
3.4.10 1,495 11/8/2021
3.4.9 2,588 11/5/2021
3.4.8 583 11/4/2021
3.4.7 1,710 10/28/2021
3.4.6 1,167 10/26/2021
3.4.5 826 10/21/2021
3.4.4 973 10/20/2021
3.4.3 20,663 10/14/2021
3.4.2 1,372 10/5/2021
3.4.1 609 10/4/2021
3.4.0 948 10/1/2021
3.3.1 1,815 9/27/2021
3.3.0 3,590 9/16/2021
3.3.0-beta-002 527 8/28/2021
3.3.0-beta-001 312 8/27/2021
3.2.14 1,452 9/11/2021
3.2.12 4,901 8/26/2021
3.2.11 6,228 8/19/2021
3.2.10 2,943 8/2/2021
3.2.9 47,339 7/8/2021
3.2.8 2,627 6/26/2021
3.2.7 588 6/25/2021
3.2.6 2,796 6/22/2021
3.2.5 949 6/21/2021
3.2.4 805 6/16/2021
3.2.3 855 6/11/2021
3.2.2 1,025 6/3/2021
3.2.1 19,297 5/28/2021
3.2.0 637 5/28/2021
3.1.16 7,777 5/14/2021
3.1.15 6,881 4/16/2021
3.1.14 5,055 4/9/2021
3.1.12 3,300 3/23/2021
3.1.11 5,035 3/17/2021
3.1.10 1,312 3/16/2021
3.1.9 2,854 3/15/2021
3.1.8 606 3/15/2021
3.1.7 1,099 3/11/2021
3.1.6 670 3/11/2021
3.1.5 7,081 2/18/2021
3.1.4 1,026 2/12/2021
3.1.3 606 2/12/2021
3.1.2 10,609 1/25/2021
3.1.1 6,241 1/13/2021
3.1.0 1,070 1/11/2021
3.1.0-beta-001 472 1/8/2021
3.0.5 2,121 12/22/2020
3.0.4 1,351 12/19/2020
3.0.3 698 12/18/2020
3.0.2 1,226 12/16/2020
3.0.1 1,385 12/11/2020
3.0.0 3,504 12/4/2020
3.0.0-nagareyama-rc-011 710 12/2/2020
3.0.0-nagareyama-rc-010 592 11/28/2020
3.0.0-nagareyama-rc-009 1,140 11/25/2020
3.0.0-nagareyama-rc-008 665 11/19/2020
3.0.0-nagareyama-rc-007 888 11/15/2020
3.0.0-nagareyama-rc-006 680 11/13/2020
3.0.0-nagareyama-rc-005 501 11/12/2020
3.0.0-nagareyama-rc-004 563 11/10/2020
3.0.0-nagareyama-rc-003 529 11/9/2020
3.0.0-nagareyama-rc-002 628 11/8/2020
3.0.0-nagareyama-rc-001 613 11/7/2020
3.0.0-nagareyama-beta-005 548 10/31/2020
3.0.0-nagareyama-beta-004 699 10/27/2020
3.0.0-nagareyama-beta-003 531 10/25/2020
3.0.0-nagareyama-beta-002 659 10/23/2020
3.0.0-nagareyama-beta-001 496 10/23/2020
3.0.0-nagareyama-alpha-017 471 10/22/2020
3.0.0-nagareyama-alpha-016 476 10/22/2020
3.0.0-nagareyama-alpha-015 533 10/19/2020
3.0.0-nagareyama-alpha-014 555 10/18/2020
3.0.0-nagareyama-alpha-012 506 10/15/2020
3.0.0-nagareyama-alpha-011 498 10/15/2020
3.0.0-nagareyama-alpha-010 518 10/13/2020
3.0.0-nagareyama-alpha-009 533 10/11/2020
3.0.0-nagareyama-alpha-008 607 10/5/2020
3.0.0-nagareyama-alpha-007 534 10/2/2020
3.0.0-nagareyama-alpha-006 517 9/30/2020
3.0.0-nagareyama-alpha-005 467 9/29/2020
3.0.0-nagareyama-alpha-004 541 9/28/2020
3.0.0-nagareyama-alpha-003 512 9/14/2020
3.0.0-nagareyama-alpha-002 487 9/13/2020
3.0.0-nagareyama-alpha-001 614 9/13/2020

## Fixed

- [JS/TS] Propagate non-captured exception when running `Async.Start` or `Async.StartImmediate` (by @MangelMaxime)
- [JS/TS] Report an error at compilation time when trying to use `Async.RunSynchronously` (by @MangelMaxime)