Breaking

• Rewrite SwiftLintBuildToolPlugin using BUILD_WORKSPACE_DIRECTORY without relying on the --config option.
  Garric Nahapetian

• Introduce SwiftLintCommandPlugin. Rename SwiftLintBuildToolPlugin. Add Swift Package Manager installation instructions.
  garricn

• Fix Code Climate reporter output by having lower case severity values to comply with the Code Climate specification.
  waitButY

• The superfluous_disable_command rule will now be enabled for the analyze command, unless it has been disabled, and will warn about superfluous disablement of analyzer rules.
  Martin Redington #4792

• With the introduction of the consider_default_literal_types_redundant option to the redundant_type_annotation rule, Bool literals will no longer be considered redundant by default. Set this option to true to preserve the previous behavior.
  Garric Nahapetian

Experimental

• Add two new options to the lint and analyze commands: --write-baseline to save a baseline to disk, and --baseline to read a saved baseline and use it to filter out detected pre-existing violations. A new baseline command uses the reporters to print the violations in a baseline.
  Martin Redington #5475 #3421

Enhancements

• Add a reporter that outputs violations in the Static Analysis Results Interchange Format (SARIF).
  waitButY

• Ignore absence of a non-initial local config instead of falling back to default.
  kohtenko

• Add new option ignore_typealiases_and_associatedtypes to nesting rule. It excludes typealias and associatedtype declarations from the analysis. marunomi #3183

• Prevent from compiling SwiftLint target when only using SwiftLintPlugin on macOS.
  Julien Baillon #5372

• Allow to set the severity of rules (if they have one) in the short form rule_name: warning|error provided that no other attributes need to be configured.
  SimplyDanny

• Add new ignore_one_liners option to switch_case_alignment rule to ignore switch statements written in a single line.
  tonell-m #5373

• Add new shorthand_argument rule that triggers on shorthand arguments like $0, $1, etc. in closures if they are too far away from the beginning of the closure. Options allow further cases to always trigger.
  SimplyDanny #70

• Warn when --fix comes together with --strict or --lenient as only --fix takes effect then.
  SimplyDanny #5387

• Add new one_declaration_per_file rule that allows only a single class/struct/enum/protocol declaration per file. Extensions are an exception; more than one is allowed.
  Muhammad Zeeshan #2802

• Add new ignore_attributes option to redundant_type_annotation rule that allows disabling the rule for properties that are marked with at least one of the configured attributes.
  tonell-m #5366

• Rewrite the following rules with SwiftSyntax:

  • explicit_acl
  • extension_access_modifier
  • identifier_name
  • let_var_whitespace
  • mark
  • multiline_literal_brackets
  • nesting
  • nimble_operator
  • opening_brace
  • orphaned_doc_comment
  • redundant_type_annotation
  • trailing_closure
  • void_return

  SimplyDanny
  kishikawakatsumi
  Marcelo Fabri
  swiftty
  KS1019
  tonell-m

• Print invalid keys when configuration parsing fails.
  SimplyDanny #5347

• Add new final_test_case rule that triggers on non-final test classes.
  SimplyDanny

• Make superfluous_else rule auto-correctable.
  SimplyDanny

• Support other scope-exiting statements continue, break and throw in superfluous_else rule.
  SimplyDanny

• Trigger on -> () return signatures in return_value_from_void_function rule. Moreover, support automatic fixes for obvious cases.
  SimplyDanny

• Refine violation position of trailing_closure rule.
  SimplyDanny

• Trigger on the declaration keyword (i.e. let, var, func, subscript) instead of the static or class keywords in the explicit_acl rule.
  SimplyDanny

• Allow to configure more operators in identifier_name rule. The new option is named additional_operators. Use it to add more operators to the list of default operators known to the rule.
  SimplyDanny #1762

• Stop triggering no_magic_numbers rule on literals used in range expressions assigned to variables.
  SimplyDanny #5430

• Add affect_initializers option to allow unneeded_override rule to affect initializers.
  leonardosrodrigues0 #5265

• Respect scattered disable commands in auto-correction of duplicate_imports rule.
  SimplyDanny #5418

• Add new non_optional_string_data_conversion rule to enforce non-failable conversions of UTF-8 String <-> Data.
  Ben P #5263

• Refine violation position of superfluous_else rule.
  SimplyDanny

• Make sorted_enum_cases rule's comparison case-insensitive to avoid unexpected ordering.
  Oleg Kokhtenko

• Add excluded_lines_patterns to line_length to avoid linting lines that contain one of the patterns.
  kasrababaei

• Make empty_count auto-correctable.
  KS1019

• Make private_swiftui_state auto-correctable.
  mt00chikin

• Make trailing_closure correctable.
  KS1019

• Add new static_over_final_class rule to prefer static over final class declaration.
  phlippieb #5471

• Extends unused_enumerated rule to cover closure parameters, to detect cases like list.enumerated().map { idx, _ in idx } and list.enumerated().map { $1 }.
  Martin Redington #5470

• Include Double, Int and String to the exiting redundant type validation check of Bool in the redundant_type_annotation rule. Add consider_default_literal_types_redundant option supporting Bool, Double, Int and String. Setting this option to true lets the rule consider said types in declarations like let i: Int = 1 or let s: String = "" as redundant.
  Garric Nahapetian

Bug Fixes

• Invalid keys in a configuration don't lead to the default configuration being used anymore. The invalid key will just be reported but otherwise ignored.
  SimplyDanny #5565

• Fix version comparison algorithm which caused some version-dependent rules to misbehave with Swift 5.10.
  chandlerwall #5517

• Silence discarded_notification_center_observer rule in closures. Furthermore, handle get and set accessors correctly and consider implicit returns.
  SimplyDanny #4801

• Fix some false positives in let_var_whitespace rule that would happen when attributes attached to declarations were spread over multiple lines.
  SimplyDanny #4801

• Support private_over_fileprivate rule for actors.
  SimplyDanny #5489

• Ensure that declarations referenced only as extended types do not count as used by means of the unused_declaration rule.
  SimplyDanny #5550

• Fix some false positives in multiline_literal_brackets rule that would happen when comments are present.
  Marcelo Fabri

• Fix some false positives in the opening_brace rule.
  kishikawakatsumi SimplyDanny
  #4610 #5114 #3470 #3574 #2632 #3476 #3756 #3690

• Ignore overridden functions with default parameters in the unneeded_override rule as they might change behavior.
  SimplyDanny #5355

• Trigger nsobject_prefer_isequal and redundant_self_in_closure even in case the surrounding declaration is nested in an extension.
  SimplyDanny

• Fixed false positives for the no_magic_numbers rule, when they are defined in a tuple like let (a, b) = (5, 10) or let a = (2, 3).
  Martin Redington #5305

• Take array and nested types into account in redundant_type_annotation rule.
  SimplyDanny #3141 #3146

• Silence pattern_matching_keywords rule when an identifier is referenced in the argument list of a matching enum case.
  SimplyDanny #3852

• Don't trigger the return_value_from_void_function warning from initializers.
  mrbkap

• Fixes superfluous warnings about configurations for rules that were not enabled, when the rules were enabled in a parent configuration.
  Martin Redington #4858

• Add all pseudo-rule for analyzer_rules - enables all analyzer rules that are not listed in disabled_rules.
  woxtu Martin Redington #4999

• Updates the reasons provided by violations of the blanket_disable_command to omit language about the end of the file, and to direct users to re-enable the rule as soon as possible.
  Martin Redington #5450

Using Bazel

With bzlmod:

// Pending BCR update
bazel_dep(name = "swiftlint", version = "0.55.0", 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 = "e69564e8a0e0b9f0695d398f076f125af86666223c1dd6a88ae213e5334ebffc",
    url = "https://github.com/realm/SwiftLint/releases/download/0.55.0/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