The official repository for the F# compiler, core library, language service, and Visual Studio tooling.
F# is a functional-first, cross-platform, open-source programming language that runs on the .NET platform. It provides the compiler, core library, and tooling necessary to develop applications with an emphasis on correctness, simplicity, and performance. This repository is the official source for these core components and their ongoing development.
Developers interested in functional programming on .NET, contributors to the F# language ecosystem, and those building tools or integrations for F#.
Developers choose F# for its strong type system, immutability by default, and seamless interoperability with the entire .NET ecosystem. This repository offers direct access to the language's core implementation and the opportunity to shape its future.
The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio
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The project has clear contribution guidelines, help-wanted labels, and active community channels like FSSF Slack, making it highly accessible for contributors and transparent in its evolution.
Supports builds on any OS with .NET, using build.cmd for Windows and build.sh for Linux/macOS, as documented in the README, enabling development without platform lock-in.
Includes FSharp.Compiler.Service for editor features like IntelliSense and refactoring, plus Visual Studio tooling, providing a full development experience out of the box.
Follows a formal RFC process via the fslang-design repository, ensuring community involvement and transparent decision-making for language changes, as highlighted in the documentation.
Default builds on Windows require Visual Studio installation, and while -noVisualStudio flag exists, full tooling integration is tied to VS, limiting users of alternative IDEs.
The README admits the codebase can feel daunting for beginners, with contributions requiring deep understanding of compiler architecture and F# specifics, as noted in the Compiler Documentation.
NuGet releases are synched with SDK releases, delaying access to latest features from the main branch, and nightly packages are only available via Azure feeds, not mainstream NuGet.