Open ConfigurationError up to be used more broadly (#5005)

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/AttributesConfiguration.swift

@@ -18,7 +18,7 @@ struct AttributesConfiguration: SeverityBasedRuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let attributesWithArgumentsAlwaysOnNewLine

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/BlanketDisableCommandConfiguration.swift

@@ -17,7 +17,7 @@ public struct BlanketDisableCommandConfiguration: SeverityBasedRuleConfiguration
 
     public mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration["severity"] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/CollectionAlignmentConfiguration.swift

@@ -10,7 +10,7 @@ struct CollectionAlignmentConfiguration: SeverityBasedRuleConfiguration, Equatab
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         alignColons = configuration["align_colons"] as? Bool ?? false

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ColonConfiguration.swift

@@ -11,7 +11,7 @@ struct ColonConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         flexibleRightSpacing = configuration["flexible_right_spacing"] as? Bool == true

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ComputedAccessorsOrderRuleConfiguration.swift

@@ -14,7 +14,7 @@ struct ComputedAccessorsOrderRuleConfiguration: SeverityBasedRuleConfiguration,
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let orderString = configuration["order"] as? String,

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ConditionalReturnsOnNewlineConfiguration.swift

@@ -8,7 +8,7 @@ struct ConditionalReturnsOnNewlineConfiguration: SeverityBasedRuleConfiguration,
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         ifOnly = configuration["if_only"] as? Bool ?? false

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/CyclomaticComplexityConfiguration.swift

@@ -55,7 +55,7 @@ struct CyclomaticComplexityConfiguration: RuleConfiguration, Equatable {
         } else if let configDict = configuration as? [String: Any], configDict.isNotEmpty {
             for (string, value) in configDict {
                 guard let key = ConfigurationKey(rawValue: string) else {
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
                 switch (key, value) {
                 case (.error, let intValue as Int):
@@ -65,11 +65,11 @@ struct CyclomaticComplexityConfiguration: RuleConfiguration, Equatable {
                 case (.ignoresCaseStatements, let boolValue as Bool):
                     ignoresCaseStatements = boolValue
                 default:
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
             }
         } else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
     }
 }

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/DeploymentTargetConfiguration.swift

@@ -60,7 +60,7 @@ struct DeploymentTargetConfiguration: SeverityBasedRuleConfiguration, Equatable
         private static func parseVersion(string: String) throws -> (Int, Int, Int) {
             func parseNumber(_ string: String) throws -> Int {
                 guard let number = Int(string) else {
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
                 return number
             }
@@ -68,7 +68,7 @@ struct DeploymentTargetConfiguration: SeverityBasedRuleConfiguration, Equatable
             let parts = string.components(separatedBy: ".")
             switch parts.count {
             case 0:
-                throw ConfigurationError.unknownConfiguration
+                throw Issue.unknownConfiguration
             case 1:
                 return (try parseNumber(parts[0]), 0, 0)
             case 2:
@@ -128,7 +128,7 @@ struct DeploymentTargetConfiguration: SeverityBasedRuleConfiguration, Equatable
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
         for (key, value) in configuration {
             if key == "severity", let value = value as? String {
@@ -136,7 +136,7 @@ struct DeploymentTargetConfiguration: SeverityBasedRuleConfiguration, Equatable
                 continue
             }
             guard let target = targets[key] else {
-                throw ConfigurationError.unknownConfiguration
+                throw Issue.unknownConfiguration
             }
             try target.update(using: value)
             if let extensionConfigurationKey = target.platform.appExtensionCounterpart?.configurationKey,

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/DiscouragedDirectInitConfiguration.swift

@@ -25,7 +25,7 @@ struct DiscouragedDirectInitConfiguration: SeverityBasedRuleConfiguration, Equat
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration["severity"] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/EmptyCountConfiguration.swift

@@ -14,7 +14,7 @@ struct EmptyCountConfiguration: SeverityBasedRuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration[ConfigurationKey.severity.rawValue] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ExpiringTodoConfiguration.swift

@@ -59,7 +59,7 @@ struct ExpiringTodoConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let approachingExpiryConfiguration = configurationDict["approaching_expiry_severity"] {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ExplicitTypeInterfaceConfiguration.swift

@@ -25,7 +25,7 @@ struct ExplicitTypeInterfaceConfiguration: SeverityBasedRuleConfiguration, Equat
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
         for (key, value) in configuration {
             switch (key, value) {
@@ -36,7 +36,7 @@ struct ExplicitTypeInterfaceConfiguration: SeverityBasedRuleConfiguration, Equat
             case ("allow_redundancy", let allowRedundancy as Bool):
                 self.allowRedundancy = allowRedundancy
             default:
-                throw ConfigurationError.unknownConfiguration
+                throw Issue.unknownConfiguration
             }
         }
     }

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/FileHeaderConfiguration.swift

@@ -35,7 +35,7 @@ struct FileHeaderConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: String] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         // Cache the created regexes if possible.

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/FileLengthRuleConfiguration.swift

@@ -27,7 +27,7 @@ struct FileLengthRuleConfiguration: RuleConfiguration, Equatable {
         } else if let configDict = configuration as? [String: Any], configDict.isNotEmpty {
             for (string, value) in configDict {
                 guard let key = ConfigurationKey(rawValue: string) else {
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
                 switch (key, value) {
                 case (.error, let intValue as Int):
@@ -37,11 +37,11 @@ struct FileLengthRuleConfiguration: RuleConfiguration, Equatable {
                 case (.ignoreCommentOnlyLines, let boolValue as Bool):
                     ignoreCommentOnlyLines = boolValue
                 default:
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
             }
         } else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
     }
 }

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/FileNameConfiguration.swift

@@ -24,7 +24,7 @@ struct FileNameConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityConfiguration = configurationDict["severity"] {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/FileNameNoSpaceConfiguration.swift

@@ -14,7 +14,7 @@ struct FileNameNoSpaceConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityConfiguration = configurationDict["severity"] {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/FileTypesOrderConfiguration.swift

@@ -23,7 +23,7 @@ struct FileTypesOrderConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         var customOrder = [[FileType]]()

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ForWhereRuleConfiguration.swift

@@ -8,7 +8,7 @@ struct ForWhereRuleConfiguration: SeverityBasedRuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         allowForAsFilter = configuration["allow_for_as_filter"] as? Bool ?? false

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/FunctionParameterCountConfiguration.swift

@@ -27,7 +27,7 @@ struct FunctionParameterCountConfiguration: RuleConfiguration, Equatable {
         } else if let configDict = configuration as? [String: Any], configDict.isNotEmpty {
             for (string, value) in configDict {
                 guard let key = ConfigurationKey(rawValue: string) else {
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
                 switch (key, value) {
                 case (.error, let intValue as Int):
@@ -37,11 +37,11 @@ struct FunctionParameterCountConfiguration: RuleConfiguration, Equatable {
                 case (.ignoresDefaultParameters, let boolValue as Bool):
                     ignoresDefaultParameters = boolValue
                 default:
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
             }
         } else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
     }
 }

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ImplicitReturnConfiguration.swift

@@ -23,13 +23,13 @@ struct ImplicitReturnConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let includedKinds = configuration["included"] as? [String] {
             self.includedKinds = try Set(includedKinds.map {
                 guard let kind = ReturnKind(rawValue: $0) else {
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
 
                 return kind

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ImplicitlyUnwrappedOptionalConfiguration.swift

@@ -8,7 +8,7 @@ enum ImplicitlyUnwrappedOptionalModeConfiguration: String {
             let value = Self(rawValue: string) {
             self = value
         } else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
     }
 }
@@ -29,7 +29,7 @@ struct ImplicitlyUnwrappedOptionalConfiguration: SeverityBasedRuleConfiguration,
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let modeString = configuration["mode"] {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/InclusiveLanguageConfiguration.swift

@@ -38,7 +38,7 @@ struct InclusiveLanguageConfiguration: SeverityBasedRuleConfiguration, Equatable
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration[ConfigurationKey.severity.rawValue] {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/IndentationWidthConfiguration.swift

@@ -29,7 +29,7 @@ struct IndentationWidthConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let config = configurationDict["severity"] {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/LineLengthConfiguration.swift

@@ -77,7 +77,7 @@ struct LineLengthConfiguration: RuleConfiguration, Equatable {
     ///
     /// - throws: Throws if the configuration value isn't properly formatted.
     private mutating func applyDictionary(configuration: Any) throws {
-        let error = ConfigurationError.unknownConfiguration
+        let error = Issue.unknownConfiguration
         guard let configDict = configuration as? [String: Any],
             configDict.isNotEmpty else {
             throw error

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/MissingDocsRuleConfiguration.swift

@@ -32,7 +32,7 @@ struct MissingDocsRuleConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let dict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let shouldExcludeExtensions = dict["excludes_extensions"] as? Bool {
@@ -64,7 +64,7 @@ struct MissingDocsRuleConfiguration: RuleConfiguration, Equatable {
                 let rules: [RuleParameter<AccessControlLevel>] = try array
                     .map { val -> RuleParameter<AccessControlLevel> in
                         guard let acl = AccessControlLevel(description: val) else {
-                            throw ConfigurationError.unknownConfiguration
+                            throw Issue.unknownConfiguration
                         }
                         return RuleParameter<AccessControlLevel>(severity: severity, value: acl)
                     }
@@ -78,7 +78,7 @@ struct MissingDocsRuleConfiguration: RuleConfiguration, Equatable {
         }
 
         guard parameters.count == parameters.map({ $0.value }).unique.count else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         return parameters.isNotEmpty ? parameters : nil

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ModifierOrderConfiguration.swift

@@ -19,14 +19,14 @@ struct ModifierOrderConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let preferredModifierOrder = configuration["preferred_modifier_order"] as? [String] {
             self.preferredModifierOrder = try preferredModifierOrder.map {
                 guard let modifierGroup = SwiftDeclarationAttributeKind.ModifierGroup(rawValue: $0),
                       modifierGroup != .atPrefixed else {
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
 
                 return modifierGroup

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/MultilineArgumentsConfiguration.swift

@@ -14,7 +14,7 @@ struct MultilineArgumentsConfiguration: RuleConfiguration, SeverityBasedRuleConf
             guard
                 let string = (value as? String)?.lowercased(),
                 let value = Self(rawValue: string) else {
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
             }
 
             self = value
@@ -33,7 +33,7 @@ struct MultilineArgumentsConfiguration: RuleConfiguration, SeverityBasedRuleConf
     }
 
     mutating func apply(configuration: Any) throws {
-        let error = ConfigurationError.unknownConfiguration
+        let error = Issue.unknownConfiguration
 
         guard let configuration = configuration as? [String: Any] else {
             throw error

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/MultilineParametersConfiguration.swift

@@ -9,7 +9,7 @@ struct MultilineParametersConfiguration: SeverityBasedRuleConfiguration, Equatab
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         allowsSingleLine = configuration["allows_single_line"] as? Bool ?? true

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/NameConfiguration.swift

@@ -48,7 +48,7 @@ struct NameConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let minLengthConfiguration = configurationDict["min_length"] {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/NestingConfiguration.swift

@@ -25,7 +25,7 @@ struct NestingConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let typeLevelConfiguration = configurationDict["type_level"] {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/NumberSeparatorConfiguration.swift

@@ -24,7 +24,7 @@ struct NumberSeparatorConfiguration: SeverityBasedRuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let minimumLength = configuration["minimum_length"] as? Int {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ObjectLiteralConfiguration.swift

@@ -11,7 +11,7 @@ struct ObjectLiteralConfiguration: SeverityBasedRuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         imageLiteral = configuration["image_literal"] as? Bool ?? true

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/OpeningBraceConfiguration.swift

@@ -14,7 +14,7 @@ struct OpeningBraceConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration[ConfigurationKey.severity.rawValue] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/OperatorUsageWhitespaceConfiguration.swift

@@ -13,7 +13,7 @@ struct OperatorUsageWhitespaceConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         linesLookAround = configuration["lines_look_around"] as? Int ?? 2

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/OverriddenSuperCallConfiguration.swift

@@ -47,7 +47,7 @@ struct OverriddenSuperCallConfiguration: SeverityBasedRuleConfiguration, Equatab
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration["severity"] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/PrefixedConstantRuleConfiguration.swift

@@ -12,7 +12,7 @@ struct PrefixedConstantRuleConfiguration: SeverityBasedRuleConfiguration, Equata
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         onlyPrivateMembers = (configuration["only_private"] as? Bool == true)

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/PrivateOutletRuleConfiguration.swift

@@ -12,7 +12,7 @@ struct PrivateOutletRuleConfiguration: SeverityBasedRuleConfiguration, Equatable
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         allowPrivateSet = (configuration["allow_private_set"] as? Bool == true)

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/PrivateOverFilePrivateRuleConfiguration.swift

@@ -10,7 +10,7 @@ struct PrivateOverFilePrivateRuleConfiguration: SeverityBasedRuleConfiguration,
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration["severity"] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/PrivateUnitTestConfiguration.swift

@@ -34,7 +34,7 @@ struct PrivateUnitTestConfiguration: SeverityBasedRuleConfiguration, Equatable,
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
         if let regexString = configurationDict["regex"] as? String {
             regex = try .cached(pattern: regexString)

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/ProhibitedSuperConfiguration.swift

@@ -24,7 +24,7 @@ struct ProhibitedSuperConfiguration: SeverityBasedRuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration["severity"] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/RequiredEnumCaseRuleConfiguration.swift

@@ -32,7 +32,7 @@ struct RequiredEnumCaseRuleConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let config = configuration as? [String: [String: String]] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         register(protocols: config)

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/SelfBindingConfiguration.swift

@@ -14,7 +14,7 @@ struct SelfBindingConfiguration: SeverityBasedRuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration[ConfigurationKey.severity.rawValue] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/StatementModeConfiguration.swift

@@ -7,7 +7,7 @@ enum StatementModeConfiguration: String {
             let value = Self(rawValue: string) {
             self = value
         } else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
     }
 }
@@ -23,7 +23,7 @@ struct StatementConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
         if let statementModeConfiguration = configurationDict["statement_mode"] {
             try statementMode = StatementModeConfiguration(value: statementModeConfiguration)

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/SwitchCaseAlignmentConfiguration.swift

@@ -10,7 +10,7 @@ struct SwitchCaseAlignmentConfiguration: SeverityBasedRuleConfiguration, Equatab
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         indentedCases = configuration["indented_cases"] as? Bool ?? false

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/TestCaseAccessibilityConfiguration.swift

@@ -11,7 +11,7 @@ struct TestCaseAccessibilityConfiguration: SeverityBasedRuleConfiguration, Equat
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration["severity"] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/TrailingClosureConfiguration.swift

@@ -13,7 +13,7 @@ struct TrailingClosureConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         onlySingleMutedParameter = (configuration["only_single_muted_parameter"] as? Bool == true)

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/TrailingCommaConfiguration.swift

@@ -12,7 +12,7 @@ struct TrailingCommaConfiguration: SeverityBasedRuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         mandatoryComma = (configuration["mandatory_comma"] as? Bool == true)

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/TrailingWhitespaceConfiguration.swift

@@ -16,7 +16,7 @@ struct TrailingWhitespaceConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         ignoresEmptyLines = (configuration["ignores_empty_lines"] as? Bool == true)

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/TypeContentsOrderConfiguration.swift

@@ -42,7 +42,7 @@ struct TypeContentsOrderConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         var customOrder = [[TypeContent]]()

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/TypeNameRuleConfiguration.swift

@@ -11,7 +11,7 @@ struct TypeNameRuleConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
         try nameConfiguration.apply(configuration: configuration)
 

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/UnitTestRuleConfiguration.swift

@@ -14,7 +14,7 @@ struct UnitTestRuleConfiguration: SeverityBasedRuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration["severity"] as? String {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/UnusedDeclarationConfiguration.swift

@@ -23,12 +23,12 @@ struct UnusedDeclarationConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configDict = configuration as? [String: Any], configDict.isNotEmpty else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         for (string, value) in configDict {
             guard let key = ConfigurationKey(rawValue: string) else {
-                throw ConfigurationError.unknownConfiguration
+                throw Issue.unknownConfiguration
             }
             switch (key, value) {
             case (.severity, let stringValue as String):
@@ -39,10 +39,10 @@ struct UnusedDeclarationConfiguration: RuleConfiguration, Equatable {
                 if let usrs = [String].array(of: value) {
                     relatedUSRsToSkip.formUnion(usrs)
                 } else {
-                    throw ConfigurationError.unknownConfiguration
+                    throw Issue.unknownConfiguration
                 }
             default:
-                throw ConfigurationError.unknownConfiguration
+                throw Issue.unknownConfiguration
             }
         }
     }

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/UnusedImportConfiguration.swift

@@ -12,7 +12,7 @@ struct TransitiveModuleConfiguration: Equatable {
             let importedModule = configurationDict["module"] as? String,
             let transitivelyImportedModules = configurationDict["allowed_transitive_imports"] as? [String]
         else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
         self.importedModule = importedModule
         self.transitivelyImportedModules = transitivelyImportedModules
@@ -46,7 +46,7 @@ struct UnusedImportConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityConfiguration = configurationDict["severity"] {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/UnusedOptionalBindingConfiguration.swift

@@ -12,7 +12,7 @@ struct UnusedOptionalBindingConfiguration: SeverityBasedRuleConfiguration, Equat
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let ignoreOptionalTry = configuration["ignore_optional_try"] as? Bool {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/VerticalWhitespaceClosingBracesConfiguration.swift

@@ -15,12 +15,12 @@ struct VerticalWhitespaceClosingBracesConfiguration: RuleConfiguration, Equatabl
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         for (string, value) in configuration {
             guard let key = ConfigurationKey(rawValue: string) else {
-                throw ConfigurationError.unknownConfiguration
+                throw Issue.unknownConfiguration
             }
 
             switch (key, value) {
@@ -29,7 +29,7 @@ struct VerticalWhitespaceClosingBracesConfiguration: RuleConfiguration, Equatabl
             case (.onlyEnforceBeforeTrivialLines, let boolValue as Bool):
                 onlyEnforceBeforeTrivialLines = boolValue
             default:
-                throw ConfigurationError.unknownConfiguration
+                throw Issue.unknownConfiguration
             }
         }
     }

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/VerticalWhitespaceConfiguration.swift

@@ -12,7 +12,7 @@ struct VerticalWhitespaceConfiguration: RuleConfiguration, Equatable {
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let maxEmptyLines = configuration["max_empty_lines"] as? Int {

Source/SwiftLintBuiltInRules/Rules/RuleConfigurations/XCTSpecificMatcherRuleConfiguration.swift

@@ -21,7 +21,7 @@ struct XCTSpecificMatcherRuleConfiguration: SeverityBasedRuleConfiguration, Equa
 
     mutating func apply(configuration: Any) throws {
         guard let configuration = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         if let severityString = configuration[ConfigurationKey.severity.rawValue] as? String {

Source/SwiftLintCore/Extensions/Configuration+FileGraph.swift

@@ -120,7 +120,7 @@ public extension Configuration {
                 // Local vertices are allowed to have local / remote references
                 // Remote vertices are only allowed to have remote references
                 if vertix.originatesFromRemote && !referencedVertix.originatesFromRemote {
-                    throw ConfigurationError.generic("Remote configs are not allowed to reference local configs.")
+                    throw Issue.genericWarning("Remote configs are not allowed to reference local configs.")
                 } else {
                     let existingVertix = findPossiblyExistingVertix(sameAs: referencedVertix)
                     let existingVertixCopy = existingVertix.map { $0.copy(withNewRootDirectory: rootDirectory) }
@@ -169,7 +169,7 @@ public extension Configuration {
                 // Please note that the equality check (`==`), not the identity check (`===`) is used
                 let children = edges.filter { $0.parent == stack.last }.map { $0.child! }
                 if stack.contains(where: children.contains) {
-                    throw ConfigurationError.generic("There's a cycle of child / parent config references. "
+                    throw Issue.genericWarning("There's a cycle of child / parent config references. "
                         + "Please check the hierarchy of configuration files passed via the command line "
                         + "and the childConfig / parentConfig entries within them.")
                 }
@@ -180,13 +180,13 @@ public extension Configuration {
 
             // Detect ambiguities
             if (edges.contains { edge in edges.filter { $0.parent == edge.parent }.count > 1 }) {
-                throw ConfigurationError.generic("There's an ambiguity in the child / parent configuration tree: "
+                throw Issue.genericWarning("There's an ambiguity in the child / parent configuration tree: "
                     + "More than one parent is declared for a specific configuration, "
                     + "where there should only be exactly one.")
             }
 
             if (edges.contains { edge in edges.filter { $0.child == edge.child }.count > 1 }) {
-                throw ConfigurationError.generic("There's an ambiguity in the child / parent configuration tree: "
+                throw Issue.genericWarning("There's an ambiguity in the child / parent configuration tree: "
                     + "More than one child is declared for a specific configuration, "
                     + "where there should only be exactly one.")
             }
@@ -196,7 +196,7 @@ public extension Configuration {
                 let startingVertix = (vertices.first { vertix in !edges.contains { $0.child == vertix } })
             else {
                 guard vertices.isEmpty else {
-                    throw ConfigurationError.generic("Unknown Configuration Error")
+                    throw Issue.genericWarning("Unknown Configuration Error")
                 }
 
                 return []
@@ -206,7 +206,7 @@ public extension Configuration {
             while let vertix = (edges.first { $0.parent == verticesToMerge.last }?.child) {
                 guard !verticesToMerge.contains(vertix) else {
                     // This shouldn't happen on a cycle free graph but let's safeguard
-                    throw ConfigurationError.generic("Unknown Configuration Error")
+                    throw Issue.genericWarning("Unknown Configuration Error")
                 }
 
                 verticesToMerge.append(vertix)

Source/SwiftLintCore/Extensions/Configuration+FileGraphSubtypes.swift

@@ -74,8 +74,8 @@ internal extension Configuration.FileGraph {
         private func read(at path: String) throws -> String {
             guard !path.isEmpty && FileManager.default.fileExists(atPath: path) else {
                 throw isInitialVertix ?
-                    ConfigurationError.initialFileNotFound(path: path) :
+                    Issue.initialFileNotFound(path: path) :
-                    ConfigurationError.generic("File \(path) can't be found.")
+                    Issue.genericWarning("File \(path) can't be found.")
             }
 
             return try String(contentsOfFile: path, encoding: .utf8)

Source/SwiftLintCore/Extensions/Configuration+Parsing.swift

@@ -60,7 +60,7 @@ extension Configuration {
         } catch let RuleListError.duplicatedConfigurations(ruleType) {
             let aliases = ruleType.description.deprecatedAliases.map { "'\($0)'" }.joined(separator: ", ")
             let identifier = ruleType.description.identifier
-            throw ConfigurationError.generic(
+            throw Issue.genericWarning(
                 "Multiple configurations found for '\(identifier)'. Check for any aliases: \(aliases)."
             )
         }

Source/SwiftLintCore/Extensions/Configuration+Remote.swift

@@ -65,7 +65,7 @@ internal extension Configuration.FileGraph.FilePath {
 
             // Handle wrong url format
             guard let url = URL(string: urlString) else {
-                throw ConfigurationError.generic("Invalid configuration entry: \"\(urlString)\" isn't a valid url.")
+                throw Issue.genericWarning("Invalid configuration entry: \"\(urlString)\" isn't a valid url.")
             }
 
             // Load from url
@@ -126,7 +126,7 @@ internal extension Configuration.FileGraph.FilePath {
             self = .existing(path: cachedFilePath)
             return cachedFilePath
         } else {
-            throw ConfigurationError.generic(
+            throw Issue.genericWarning(
                 "No internet connectivity: Unable to load remote config from \"\(urlString)\". "
                     + "Also didn't found cached version to fallback to."
             )
@@ -155,12 +155,12 @@ internal extension Configuration.FileGraph.FilePath {
             return cachedFilePath
         } else {
             if taskDone {
-                throw ConfigurationError.generic(
+                throw Issue.genericWarning(
                     "Unable to load remote config from \"\(urlString)\". "
                         + "Also didn't found cached version to fallback to."
                 )
             } else {
-                throw ConfigurationError.generic(
+                throw Issue.genericWarning(
                     "Timeout (\(timeout) sec): Unable to load remote config from \"\(urlString)\". "
                         + "Also didn't found cached version to fallback to."
                 )
@@ -176,7 +176,7 @@ internal extension Configuration.FileGraph.FilePath {
             self = .existing(path: cachedFilePath)
             return cachedFilePath
         } else {
-            throw ConfigurationError.generic(
+            throw Issue.genericWarning(
                 "Unable to cache remote config from \"\(urlString)\". Also didn't found cached version to fallback to."
             )
         }
@@ -261,7 +261,7 @@ internal extension Configuration.FileGraph.FilePath {
                 contents: Data(newGitignoreAppendix.utf8),
                 attributes: [:]
             ) else {
-                throw ConfigurationError.generic("Issue maintaining remote config cache.")
+                throw Issue.genericWarning("Issue maintaining remote config cache.")
             }
         } else {
             var contents = try String(contentsOfFile: Configuration.FileGraph.FilePath.gitignorePath, encoding: .utf8)

Source/SwiftLintCore/Extensions/Configuration+RulesMode.swift

@@ -50,7 +50,7 @@ public extension Configuration {
                 self = .allEnabled
             } else if onlyRules.isNotEmpty {
                 if disabledRules.isNotEmpty || optInRules.isNotEmpty {
-                    throw ConfigurationError.generic(
+                    throw Issue.genericWarning(
                         "'\(Configuration.Key.disabledRules.rawValue)' or " +
                             "'\(Configuration.Key.optInRules.rawValue)' cannot be used in combination " +
                         "with '\(Configuration.Key.onlyRules.rawValue)'"

Source/SwiftLintCore/Extensions/SyntaxKind+SwiftLint.swift

@@ -4,7 +4,7 @@ public extension SyntaxKind {
     init(shortName: Swift.String) throws {
         let prefix = "source.lang.swift.syntaxtype."
         guard let kind = SyntaxKind(rawValue: prefix + shortName.lowercased()) else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
         self = kind
     }

Source/SwiftLintCore/Models/Configuration.swift

@@ -262,7 +262,7 @@ private enum FileGraphInitializationResult {
 
     init(error: Error, hasCustomConfigurationFiles: Bool) {
         switch error {
-        case let ConfigurationError.initialFileNotFound(path):
+        case let Issue.initialFileNotFound(path):
             if hasCustomConfigurationFiles {
                 self = .error(message: "SwiftLint Configuration Error: Could not read file at path: \(path)")
             } else {
@@ -270,9 +270,9 @@ private enum FileGraphInitializationResult {
                 // -> don't handle as error
                 self = .initialImplicitFileNotFound
             }
-        case let ConfigurationError.generic(message):
+        case let Issue.genericWarning(message):
             self = .error(message: "SwiftLint Configuration Error: \(message)")
-        case let YamlParserError.yamlParsing(message):
+        case let Issue.yamlParsing(message):
             self = .error(message: "YML Parsing Error: \(message)")
         default:
             self = .error(message: error.localizedDescription)

Source/SwiftLintCore/Models/ConfigurationError.swift

@@ -1,14 +0,0 @@
-/// All possible configuration errors.
-public enum ConfigurationError: Error, Equatable {
-    /// The configuration didn't match internal expectations.
-    case unknownConfiguration
-
-    /// The configuration had both `match_kind` and `excluded_match_kind` parameters.
-    case ambiguousMatchKindParameters
-
-    /// A generic configuration error specified by a string.
-    case generic(String)
-
-    /// The initial configuration file was not found.
-    case initialFileNotFound(path: String)
-}

Source/SwiftLintCore/Models/Issue.swift

@@ -0,0 +1,47 @@
+import Foundation
+
+/// All possible SwiftLint issues which are printed as warnings by default.
+public enum Issue: LocalizedError, Equatable {
+    /// The configuration didn't match internal expectations.
+    case unknownConfiguration
+
+    /// A generic warning specified by a string.
+    case genericWarning(String)
+
+    /// A deprecation warning for a rule.
+    case deprecation(ruleID: String)
+
+    /// The initial configuration file was not found.
+    case initialFileNotFound(path: String)
+
+    /// An error that occurred when parsing YAML.
+    case yamlParsing(String)
+
+    /// The issues description which is ready to be printed to the console.
+    var errorDescription: String {
+        switch self {
+        case .genericWarning:
+            return "warning: \(message)"
+        default:
+            return Self.genericWarning(message).errorDescription
+        }
+    }
+
+    private var message: String {
+        switch self {
+        case .unknownConfiguration:
+            return "Invalid configuration. Falling back to default."
+        case .genericWarning(let message):
+            return "\(message)"
+        case .deprecation(let ruleID):
+            return """
+                The `\(ruleID)` rule is now deprecated and will be \
+                completely removed in a future release.
+                """
+        case .initialFileNotFound(let path):
+            return "Could not read file at path \(path)."
+        case .yamlParsing(let message):
+            return "Cannot parse YAML file: \(message)"
+        }
+    }
+}

Source/SwiftLintCore/Models/SeverityConfiguration.swift

@@ -27,7 +27,7 @@ public struct SeverityConfiguration: SeverityBasedRuleConfiguration, Equatable {
         let configDict = configuration as? [String: Any]
         guard let severityString: String = configString ?? configDict?["severity"] as? String,
             let severity = ViolationSeverity(rawValue: severityString.lowercased()) else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
         self.severity = severity
     }

Source/SwiftLintCore/Models/YamlParser.swift

@@ -1,12 +1,6 @@
 import Foundation
 import Yams
 
-// MARK: - YamlParsingError
-
-internal enum YamlParserError: Error, Equatable {
-    case yamlParsing(String)
-}
-
 // MARK: - YamlParser
 
 /// An interface for parsing YAML.
@@ -25,7 +19,7 @@ public struct YamlParser {
             return try Yams.load(yaml: yaml, .default,
                                  .swiftlintConstructor(env: env)) as? [String: Any] ?? [:]
         } catch {
-            throw YamlParserError.yamlParsing("\(error)")
+            throw Issue.yamlParsing("\(error)")
         }
     }
 }

Source/SwiftLintCore/RuleConfigurations/RegexConfiguration.swift

@@ -61,7 +61,7 @@ public struct RegexConfiguration: SeverityBasedRuleConfiguration, Hashable, Cach
     public mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any],
             let regexString = configurationDict["regex"] as? String else {
-                throw ConfigurationError.unknownConfiguration
+                throw Issue.unknownConfiguration
         }
 
         regex = try .cached(pattern: regexString)
@@ -93,7 +93,7 @@ public struct RegexConfiguration: SeverityBasedRuleConfiguration, Hashable, Cach
         }
         if let captureGroup = configurationDict["capture_group"] as? Int {
             guard (0 ... regex.numberOfCaptureGroups).contains(captureGroup) else {
-                throw ConfigurationError.unknownConfiguration
+                throw Issue.unknownConfiguration
             }
             self.captureGroup = captureGroup
         }
@@ -133,7 +133,9 @@ public struct RegexConfiguration: SeverityBasedRuleConfiguration, Hashable, Cach
         case (nil, nil):
             return .init()
         case (.some, .some):
-            throw ConfigurationError.ambiguousMatchKindParameters
+            throw Issue.genericWarning(
+                "The configuration keys 'match_kinds' and 'excluded_match_kinds' cannot appear at the same time."
+            )
         }
     }
 }

Source/SwiftLintCore/RuleConfigurations/SeverityLevelsConfiguration.swift

@@ -50,7 +50,7 @@ public struct SeverityLevelsConfiguration: RuleConfiguration, Equatable {
             warning = (configDict["warning"] as? Int) ?? warning
             error = configDict["error"] as? Int
         } else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
     }
 }

Source/SwiftLintCore/Rules/CustomRules.swift

@@ -14,7 +14,7 @@ struct CustomRulesConfiguration: RuleConfiguration, Equatable, CacheDescriptionP
 
     mutating func apply(configuration: Any) throws {
         guard let configurationDict = configuration as? [String: Any] else {
-            throw ConfigurationError.unknownConfiguration
+            throw Issue.unknownConfiguration
         }
 
         for (key, value) in configurationDict {

Tests/SwiftLintFrameworkTests/CustomRulesTests.swift

@@ -60,7 +60,7 @@ class CustomRulesTests: SwiftLintTestCase {
     func testCustomRuleConfigurationThrows() {
         let config = 17
         var customRulesConfig = CustomRulesConfiguration()
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try customRulesConfig.apply(configuration: config)
         }
     }
@@ -76,7 +76,10 @@ class CustomRulesTests: SwiftLintTestCase {
         ]
 
         var configuration = RegexConfiguration(identifier: "my_custom_rule")
-        checkError(ConfigurationError.ambiguousMatchKindParameters) {
+        let expectedError = Issue.genericWarning(
+            "The configuration keys 'match_kinds' and 'excluded_match_kinds' cannot appear at the same time."
+        )
+        checkError(expectedError) {
             try configuration.apply(configuration: configDict)
         }
     }

Tests/SwiftLintFrameworkTests/CyclomaticComplexityConfigurationTests.swift

@@ -61,7 +61,7 @@ class CyclomaticComplexityConfigurationTests: SwiftLintTestCase {
 
         for badConfig in badConfigs {
             var configuration = CyclomaticComplexityConfiguration(warning: 100, error: 150)
-            checkError(ConfigurationError.unknownConfiguration) {
+            checkError(Issue.unknownConfiguration) {
                 try configuration.apply(configuration: badConfig)
             }
         }

Tests/SwiftLintFrameworkTests/DeploymentTargetConfigurationTests.swift

@@ -137,7 +137,7 @@ class DeploymentTargetConfigurationTests: SwiftLintTestCase {
 
         for badConfig in badConfigs {
             var configuration = DeploymentTargetConfiguration()
-            checkError(ConfigurationError.unknownConfiguration) {
+            checkError(Issue.unknownConfiguration) {
                 try configuration.apply(configuration: badConfig)
             }
         }

Tests/SwiftLintFrameworkTests/ExplicitTypeInterfaceConfigurationTests.swift

@@ -20,21 +20,21 @@ class ExplicitTypeInterfaceConfigurationTests: SwiftLintTestCase {
 
     func testInvalidKeyInCustomConfiguration() {
         var config = ExplicitTypeInterfaceConfiguration()
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try config.apply(configuration: ["invalidKey": "error"])
         }
     }
 
     func testInvalidTypeOfCustomConfiguration() {
         var config = ExplicitTypeInterfaceConfiguration()
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try config.apply(configuration: "invalidKey")
         }
     }
 
     func testInvalidTypeOfValueInCustomConfiguration() {
         var config = ExplicitTypeInterfaceConfiguration()
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try config.apply(configuration: ["severity": 1])
         }
     }

Tests/SwiftLintFrameworkTests/ImplicitReturnConfigurationTests.swift

@@ -27,7 +27,7 @@ class ImplicitReturnConfigurationTests: SwiftLintTestCase {
         var configuration = ImplicitReturnConfiguration()
         let config = ["included": ["foreach"]] as [String: Any]
 
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try configuration.apply(configuration: config)
         }
     }

Tests/SwiftLintFrameworkTests/ImplicitlyUnwrappedOptionalConfigurationTests.swift

@@ -39,7 +39,7 @@ class ImplicitlyUnwrappedOptionalConfigurationTests: SwiftLintTestCase {
                 severityConfiguration: SeverityConfiguration(.warning)
             )
 
-            checkError(ConfigurationError.unknownConfiguration) {
+            checkError(Issue.unknownConfiguration) {
                 try configuration.apply(configuration: badConfig)
             }
         }

Tests/SwiftLintFrameworkTests/LineLengthConfigurationTests.swift

@@ -83,7 +83,7 @@ class LineLengthConfigurationTests: SwiftLintTestCase {
     func testLineLengthConfigurationThrowsOnBadConfig() {
         let config = "unknown"
         var configuration = LineLengthConfiguration(warning: 100, error: 150)
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try configuration.apply(configuration: config)
         }
     }
@@ -97,7 +97,7 @@ class LineLengthConfigurationTests: SwiftLintTestCase {
 
         for badConfig in badConfigs {
             var configuration = LineLengthConfiguration(warning: 100, error: 150)
-            checkError(ConfigurationError.unknownConfiguration) {
+            checkError(Issue.unknownConfiguration) {
                 try configuration.apply(configuration: badConfig)
             }
         }

Tests/SwiftLintFrameworkTests/NameConfigurationTests.swift

@@ -48,7 +48,7 @@ class NameConfigurationTests: SwiftLintTestCase {
                                            minLengthError: 0,
                                            maxLengthWarning: 0,
                                            maxLengthError: 0)
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try nameConfig.apply(configuration: config)
         }
     }

Tests/SwiftLintFrameworkTests/RuleConfigurationTests.swift

@@ -38,7 +38,7 @@ class RuleConfigurationTests: SwiftLintTestCase {
                                                  typeLevelError: nil,
                                                  functionLevelWarning: 0,
                                                  functionLevelError: nil)
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try nestingConfig.apply(configuration: config)
         }
     }
@@ -70,7 +70,7 @@ class RuleConfigurationTests: SwiftLintTestCase {
     func testSeverityConfigurationThrowsOnBadConfig() {
         let config = 17
         var severityConfig = SeverityConfiguration(.warning)
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try severityConfig.apply(configuration: config)
         }
     }
@@ -101,7 +101,7 @@ class RuleConfigurationTests: SwiftLintTestCase {
     func testRegexConfigurationThrows() {
         let config = 17
         var regexConfig = RegexConfiguration(identifier: "")
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try regexConfig.apply(configuration: config)
         }
     }
@@ -121,7 +121,7 @@ class RuleConfigurationTests: SwiftLintTestCase {
         let config = "unknown"
         var configuration = TrailingWhitespaceConfiguration(ignoresEmptyLines: false,
                                                             ignoresComments: true)
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try configuration.apply(configuration: config)
         }
     }
@@ -303,7 +303,7 @@ class RuleConfigurationTests: SwiftLintTestCase {
         var configuration = ModifierOrderConfiguration()
         let config = ["severity": "warning", "preferred_modifier_order": ["specialize"]]  as [String: Any]
 
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try configuration.apply(configuration: config)
         }
     }
@@ -311,7 +311,7 @@ class RuleConfigurationTests: SwiftLintTestCase {
     func testModifierOrderConfigurationThrowsOnNonModifiableGroup() {
         var configuration = ModifierOrderConfiguration()
         let config = ["severity": "warning", "preferred_modifier_order": ["atPrefixed"]]  as [String: Any]
-        checkError(ConfigurationError.unknownConfiguration) {
+        checkError(Issue.unknownConfiguration) {
             try configuration.apply(configuration: config)
         }
     }

Tests/SwiftLintFrameworkTests/YamlParserTests.swift

@@ -49,7 +49,7 @@ class YamlParserTests: SwiftLintTestCase {
     }
 
     func testParseInvalidStringThrows() {
-        checkError(YamlParserError.yamlParsing("2:1: error: parser: did not find expected <document start>:\na\n^")) {
+        checkError(Issue.yamlParsing("2:1: error: parser: did not find expected <document start>:\na\n^")) {
             _ = try YamlParser.parse("|\na", env: [:])
         }
     }