Breaking

• SwiftLint now requires Swift 5.9 or higher to build.
  SimplyDanny JP Simard

Experimental

• None.

Enhancements

• Add only configuration option to todo rule which allows to specify whether the rule shall trigger on TODOs, FIXMEs or both.
  gibachan #5233

• Make unneeded_break_in_switch auto correctable.
  KS1019

• Speed up closure_parameter_position rule when there are no violations.
  Marcelo Fabri

• Rewrite cyclomatic_complexity rule using SwiftSyntax.
  Marcelo Fabri

• Rewrite redundant_void_return rule using SwiftSyntax. Also include redundant void return clauses for closures in addition to functions. This can be disabled by configuring the rule with include_closures: false.
  Marcelo Fabri JP Simard

• Rewrite discouraged_optional_collection rule using SwiftSyntax, catching more violations.
  JP Simard

• Rewrite duplicate_imports rule using SwiftSyntax.
  JP Simard

• Handle viewIsAppearing in the type_contents_order rule.
  u-abyss #5259

• Rewrite vertical_parameter_alignment_on_call rule using SwiftSyntax, fixing some false positives.
  Marcelo Fabri #3581

• Rewrite no_grouping_extension rule using SwiftSyntax.
  Marcelo Fabri

Bug Fixes

• Fix false positive in implicit_getter rule when using unknown accessors.
  kabiroberai #5300

• Fix correction of explicit_init rule by keeping significant trivia.
  BB9z #5289

• Fix invalid corrections for opaque and existential optionals in syntactic_sugar rule.
  SimplyDanny #5277

• Fix false positive in unused_import rule that triggered on @_exported imports which could break downstream modules if removed.
  jszumski #5242

• Fix false positive in unused_import rule when using a constructor defined in a transitive module.
  jszumski #5246

Using Bazel

With bzlmod:

// Pending BCR update
bazel_dep(name = "swiftlint", version = "0.54.0", repo_name = "SwiftLint")

Without bzlmod, put this in your WORKSPACE:

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "build_bazel_rules_apple",
    sha256 = "9e26307516c4d5f2ad4aee90ac01eb8cd31f9b8d6ea93619fc64b3cbc81b0944",
    url = "https://github.com/bazelbuild/rules_apple/releases/download/2.2.0/rules_apple.2.2.0.tar.gz",
)

load(
    "@build_bazel_rules_apple//apple:repositories.bzl",
    "apple_rules_dependencies",
)

apple_rules_dependencies()

load(
    "@build_bazel_rules_swift//swift:repositories.bzl",
    "swift_rules_dependencies",
)

swift_rules_dependencies()

load(
    "@build_bazel_rules_swift//swift:extras.bzl",
    "swift_rules_extra_dependencies",
)

swift_rules_extra_dependencies()

http_archive(
    name = "SwiftLint",
    sha256 = "3a97a7d225c6a39716c48aea88eee38df052f678bf6dad73f62c746a3d9cc10c",
    url = "https://github.com/realm/SwiftLint/releases/download/0.54.0/bazel.tar.gz",
)

load("@SwiftLint//bazel:repos.bzl", "swiftlint_repos")

swiftlint_repos()

load("@SwiftLint//bazel:deps.bzl", "swiftlint_deps")

swiftlint_deps()

Then you can run SwiftLint in the current directory with this command:

bazel run @SwiftLint//:swiftlint -- --help