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Ionide-VSCode: FSharp

Enhanced F# Language Features for Visual Studio Code

Part of the Ionide plugin suite. Read detailed documentation at Ionide docs page.

Version Installs Rating open collective backers open collective sponsors

You can support Ionide development on Open Collective.

Open Collective


  • .NET Core SDK - .NET Core is modern, cross-platform implementation of .NET Framework. Ionide is requiring it for set of features such as project modifications or debugging. The core part of SDK is dotnet CLI tool that provides easy way to create, build and run F# projects. What's important - the dotnet tool can be used also to create applications targeting also Full Framework (like net461). For detailed instructions on installing .NET Core, visit official step-by-step installation guide.

  • VS Code C# plugin (optional, suggested) - Ionide's debugging capabilities relies on the debugger provided by Omnisharp team. To get it install C# extension from VS Code marketplace

  • F# (Windows, optional) - Easiest way to install latest versions of F# on Windows is using VS Build Tools 2017. Install .NET 4 Framework Target Pack. If you use VS 2017, make sure that you've installed workload adding F# support. Required when running net version of FSAC.

  • F# (Linux/MacOS, optional) - F# on non-Windows platform is distributed as part of the mono. Installation guide and recent version of mono can be found on the project webpage and on the F# Software Foundation "Use on Linux" page. Required when running net version of FSAC.


  • Syntax highlighting
  • Auto completions
  • Error highlighting, error list, and quick fixes based on errors
  • Tooltips
  • Method parameter hints
  • Go to Definition
  • Peek Definition
  • Find all references
  • Highlighting usages
  • Rename
  • Show symbols in file
  • Find symbol in workspace
  • Show signature in status bar
  • Show signature as CodeLens / LineLens
  • Go to MSDN help
  • Add open NAMESPACE for symbol
  • Match case generator
  • Go to #load reference
  • Generate comment for the symbol
  • Integration with F# Interactive
  • Integration with Forge (Project scaffolding and modification)
  • Integration with FSharpLint (additional hints and quick fixes)
  • Integration with MSBuild (Build, Rebuild, Clean project)
  • Solution / project explorer

How to contribute

Imposter syndrome disclaimer: I want your help. No really, I do.

There might be a little voice inside that tells you you're not ready; that you need to do one more tutorial, or learn another framework, or write a few more blog posts before you can help me with this project.

I assure you, that's not the case.

This project has some clear Contribution Guidelines and expectations that you can read here.

The contribution guidelines outline the process that you'll need to follow to get a patch merged. By making expectations and process explicit, I hope it will make it easier for you to contribute.

And you don't just have to write code. You can help out by writing documentation, tests, or even by giving feedback about this work. (And yes, that includes giving feedback about the contribution guidelines.)

Thank you for contributing!

Contributing and copyright

The project is hosted on GitHub where you can report issues, fork the project and submit pull requests.

The library is available under MIT license, which allows modification and redistribution for both commercial and non-commercial purposes.

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

Our Sponsors

Ionide couldn't be created without the support of Lambda Factory. If your company would be interested in supporting development of Ionide, or acquiring commercial support send us an email -

You can also support Ionide development on Open Collective. Open Collective




Become a sponsor and get your logo on our README on Github, description in the VSCode marketplace and on with a link to your site.

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