FSharpLint
A static analysis tool for F# that enforces coding conventions, detects code smells, and checks formatting rules.
What is FSharpLint?
FSharpLint is a static analysis tool for F# that analyzes source code to enforce coding conventions, detect code smells, and check formatting rules. It helps developers maintain consistent code quality across F# projects by highlighting violations of configurable rules during development.
F# developers and teams who want to enforce coding standards, improve code maintainability, and catch potential issues early in their development workflow.
Developers choose FSharpLint for its deep integration with the F# ecosystem, flexible configuration via JSON and custom F# rules, and multiple usage options including command-line, MSBuild tasks, and editor integrations through Ionide and Visual Studio.
Overview
Lint tool for F#
Use Cases
Best For
- Enforcing naming conventions across F# projects
- Detecting code smells and maintainability issues in F# codebases
- Integrating linting into CI/CD pipelines via MSBuild tasks
- Maintaining consistent code structure and length limits
- Adding custom linting rules specific to team standards
- Improving code quality in editor workflows via Ionide or Visual Studio
Not Ideal For
- Projects using multiple programming languages where a F#-only linter is insufficient
- Teams needing an all-in-one tool for both linting and formatting, as FSharpLint's formatting rules are deprecated in favor of Fantomas
- Environments without supported editor integrations like Ionide or Visual Studio, requiring manual command-line setup for real-time feedback
- Beginners or teams preferring minimal configuration, due to the complexity of writing custom F# rules and JSON setup
Pros & Cons
Pros
Uses both typed and untyped syntax trees for accurate linting, as highlighted in the README, ensuring context-aware checks specific to F# language constructs.
Supports user-defined hints and custom rules written in F#, similar to Mascot and StyleCop, allowing teams to enforce project-specific standards beyond default rules.
Can be run as a dotnet tool, MSBuild task, or integrated into editors via Ionide-FSharp and Visual Studio extensions, offering versatility across development workflows.
Warns about logic indicating defects or maintainability problems, helping catch issues early, as stated in the key features for improving code quality.
Cons
Formatting checks are marked as deprecated and recommended to be handled by Fantomas, limiting FSharpLint's utility in code style enforcement without additional tools.
Creating custom rules requires F# programming knowledge and JSON configuration, which can be a barrier for teams not familiar with F# or preferring simpler, GUI-based tools.
Effective real-time linting relies heavily on editor integrations like Ionide or Visual Studio extensions, which may not be stable or available in all development environments.
Frequently Asked Questions
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