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realm/SwiftLint

SwiftLint is a static analysis tool for Swift code that enforces style, performance, and best practices through a modular rule engine. It provides automated linting via build and command-line plugins, supports custom regex-based rules, and generates reports in multiple formats. The system has been refactored to use SwiftSyntax for reliable analysis, with a modernized CLI and build system supporting Windows, Bazel, and SPM.

64.5

Adequate · 3 August 2026

64k

lines of production code

Swift

primary language

3

bus factor · 500 authors in all

3

measurements over time

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How it got here

2015–2016 · Architecture overhaul and feature expansion

This period focused on a major architectural refactoring of the linting pipeline, replacing the legacy Commandant-based CLI and monolithic linter with a modular, protocol-based system supporting parallel processing and benchmarking. Concurrently, the project expanded its capabilities by introducing custom rule support, a new superfluous disable command rule, and a wide array of output reporters, while simultaneously removing obsolete build infrastructure and dependencies.

13 changes

2018–2023 · SwiftSyntax migration and architecture modernization

This period focused on migrating SwiftLint's core engine from SourceKit to SwiftSyntax, introducing a new protocol-oriented architecture with dedicated visitors, macros, and configuration models. The team also modernized the CLI with swift-argument-parser, added Bazel build support, and expanded the rule set with new style, performance, and accessibility checks.

24 changes

2024–2026 · Testing and tooling expansion

This period focused on expanding test coverage and developer tooling for SwiftLint. The team introduced new plugins for SwiftLint integration, refactored configuration handling, and added comprehensive test suites for rules, core utilities, and file system access. Additionally, an internal CLI and Windows installer were added to improve development workflows and distribution.

15 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 3 August 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit d0dac4342f — the exact code this score is about.
  • Scored under rubric rubric-2026.08.18. Score the same commit under that rubric and you get the same number.
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