fantomas 8.1.0
Prefix ReservedSee the version list below for details.
dotnet tool install --global fantomas --version 8.1.0
dotnet new tool-manifest
dotnet tool install --local fantomas --version 8.1.0
#tool dotnet:?package=fantomas&version=8.1.0
nuke :add-package fantomas --version 8.1.0
Fantomas
An opinionated F# source code formatter.
dotnet tool install fantomas
Documentation is available at https://fsprojects.github.io/fantomas/docs/
If you point a coding agent at Fantomas, give it llms.txt for an index of the documentation, or llms-full.txt for all of it in one file.
Reporting a bug
Report bugs through the online tool, which opens an issue with everything needed to reproduce it.
With a coding agent, the fantomas-report skill shrinks the file Fantomas failed on to a minimal sample and opens the same issue form for you to review:
npx skills add fsprojects/fantomas --skill fantomas-report -g
See Reporting a bug for more.
Contributing Guidelines
See the Contribution Guidelines and our contributors documentation
| Product | Versions 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. |
This package has no dependencies.
| Version | Downloads | Last Updated |
|---|---|---|
| 9.0.0-alpha-002 | 39 | 10/21/2026 |
| 9.0.0-alpha-001 | 317 | 10/15/2026 |
| 8.1.0 | 310 | 10/21/2026 |
| 8.0.10 | 9,285 | 10/14/2026 |
| 8.0.9 | 117 | 10/14/2026 |
| 8.0.8 | 4,587 | 10/9/2026 |
| 8.0.7 | 5,428 | 10/5/2026 |
| 8.0.6 | 3,567 | 10/1/2026 |
| 8.0.5 | 16,063 | 9/25/2026 |
| 8.0.4 | 2,157 | 9/23/2026 |
| 8.0.3 | 634 | 9/23/2026 |
| 8.0.2 | 4,177 | 9/22/2026 |
| 8.0.1 | 1,908 | 9/21/2026 |
| 8.0.0 | 39,428 | 9/15/2026 |
| 8.0.0-beta-003 | 1,025 | 9/12/2026 |
| 8.0.0-beta-002 | 352 | 9/8/2026 |
| 8.0.0-beta-001 | 1,366 | 9/1/2026 |
| 8.0.0-alpha-026 | 504 | 8/29/2026 |
| 8.0.0-alpha-025 | 245 | 8/28/2026 |
| 8.0.0-alpha-024 | 141 | 8/28/2026 |
### Changed
- Multiline tuple type after a cast or type annotation operator goes one level in. [#3561](https://github.com/fsprojects/fantomas/pull/3561)
- Line comment lined up with the first element of its container stays with the elements. [#3561](https://github.com/fsprojects/fantomas/pull/3561)
### Fixed
- Parenthesized function type gets an extra indent level where no outer function type needs it. [#3554](https://github.com/fsprojects/fantomas/issues/3554)
- Multiline tuple in the middle of a function type gives invalid code. [#3556](https://github.com/fsprojects/fantomas/issues/3556)
- Parenthesized function type after an arrow gives invalid code with indent_size 2. [#3557](https://github.com/fsprojects/fantomas/issues/3557)
- Long type test with :? gives invalid code. [#3558](https://github.com/fsprojects/fantomas/issues/3558)
- Line comment after the opening parenthesis of a type moves and breaks the type. [#3559](https://github.com/fsprojects/fantomas/issues/3559)
- Comment between a match pattern and its when guard gives invalid code. [#3560](https://github.com/fsprojects/fantomas/issues/3560)
- Regression: Stroustrup bracket style in anonymous record type parameter is not respected. [#3069](https://github.com/fsprojects/fantomas/issues/3069)
- Space inserted before final > in type parameter. [#2860](https://github.com/fsprojects/fantomas/issues/2860)