v3.0.0

Applications upgrading from 2.x should expect a materially different default lint surface. In particular, many layout and style cops that were enabled in 2.x are now disabled, while a focused set of lint and newer style cops is enabled. Run RuboCop with the 3.0.0 configuration before upgrading CI, and review newly reported offenses and any local overrides.

Newly enabled cops

• Gemspec/AttributeAssignment
• Gemspec/DevelopmentDependencies
• Lint/AmbiguousAssignment
• Lint/ConstantReassignment
• Lint/CopDirectiveSyntax
• Lint/DataDefineOverride
• Lint/DisjunctiveAssignmentInConstructor
• Lint/DuplicateCaseCondition
• Lint/DuplicateElsifCondition
• Lint/DuplicateRegexpCharacterClassElement
• Lint/DuplicateRequire
• Lint/DuplicateRescueException
• Lint/DuplicateSetElement
• Lint/EmptyExpression
• Lint/InterpolationCheck
• Lint/MultipleComparison
• Lint/NestedPercentLiteral
• Lint/NoReturnInMemoization
• Lint/NumericOperationWithConstantResult
• Lint/OrAssignmentToConstant
• Lint/RedundantWithIndex
• Lint/RedundantWithObject
• Lint/RegexpAsCondition
• Lint/ReturnInVoidContext
• Lint/SelfAssignment
• Lint/SendWithMixinArgument
• Lint/TrailingCommaInAttributeDeclaration
• Lint/TripleQuotes
• Lint/UnreachablePatternBranch
• Lint/UselessDefaultValueArgument
• Lint/UselessOr
• Migration/DepartmentName
• Naming/BlockParameterName
• Naming/HeredocDelimiterCase
• Naming/MethodParameterName
• Style/AmbiguousEndlessMethodDefinition
• Style/ArrayCoercion
• Style/ColonMethodDefinition
• Style/CombinableDefined
• Style/DigChain
• Style/MapJoin
• Style/ModuleMemberExistenceCheck
• Style/MutableConstant
• Style/NegativeArrayIndex
• Style/ReduceToHash
• Style/RedundantArrayFlatten
• Style/RedundantMinMaxBy
• Style/ReverseFind
• Style/SelectByKind
• Style/SelectByRange
• Style/TallyMethod
• Style/TrailingBodyOnMethodDefinition
• Style/TrailingMethodEndStatement

Newly disabled cops

• Gemspec/OrderedDependencies
• Layout/ArrayAlignment
• Layout/AssignmentIndentation
• Layout/BeginEndAlignment
• Layout/BlockAlignment
• Layout/BlockEndNewline
• Layout/CaseIndentation
• Layout/ClosingHeredocIndentation
• Layout/EmptyComment
• Layout/EmptyLineAfterGuardClause
• Layout/EmptyLines
• Layout/EndAlignment
• Layout/ExtraSpacing
• Layout/FirstArgumentIndentation
• Layout/FirstArrayElementIndentation
• Layout/FirstArrayElementLineBreak
• Layout/FirstHashElementIndentation
• Layout/FirstHashElementLineBreak
• Layout/FirstMethodArgumentLineBreak
• Layout/FirstParameterIndentation
• Layout/HashAlignment
• Layout/HeredocIndentation
• Layout/LineEndStringConcatenationIndentation
• Layout/MultilineArrayBraceLayout
• Layout/MultilineArrayLineBreaks
• Layout/MultilineHashBraceLayout
• Layout/MultilineHashKeyLineBreaks
• Layout/MultilineMethodArgumentLineBreaks
• Layout/MultilineMethodCallBraceLayout
• Layout/MultilineMethodCallIndentation
• Layout/MultilineMethodDefinitionBraceLayout
• Layout/MultilineOperationIndentation
• Layout/ParameterAlignment
• Layout/RescueEnsureAlignment
• Lint/AmbiguousRegexpLiteral
• Lint/AssignmentInCondition
• Lint/FlipFlop
• Lint/FloatOutOfRange
• Lint/FormatParameterMismatch
• Lint/InheritException
• Lint/ItWithoutArgumentsInBlock
• Lint/LiteralAssignmentInCondition
• Lint/Loop
• Lint/MissingSuper
• Lint/NoReturnInBeginEndBlocks
• Lint/NonLocalExitFromIterator
• Lint/OrderedMagicComments
• Lint/PercentStringArray
• Lint/PercentSymbolArray
• Lint/RandOne
• Lint/RedundantRegexpQuantifiers
• Lint/RedundantSplatExpansion
• Lint/RequireParentheses
• Lint/RequireRangeParentheses
• Lint/RequireRelativeSelfPath
• Lint/RescueException
• Lint/ShadowedException
• Lint/SuppressedException
• Lint/UnderscorePrefixedVariableName
• Lint/UnifiedInteger
• Lint/UnreachableCode
• Lint/UnusedBlockArgument
• Lint/UselessAccessModifier
• Lint/UselessAssignment
• Lint/UselessElseWithoutRescue
• Lint/UselessRescue
• Lint/UselessRuby2Keywords
• Lint/UselessSetterCall
• Metrics/BlockNesting
• Metrics/CollectionLiteralLength
• Metrics/ParameterLists
• Naming/AccessorMethodName
• Naming/AsciiIdentifiers
• Naming/BinaryOperatorParameterName
• Naming/FileName
• Security/Eval
• Security/IoMethods
• Security/JSONLoad
• Security/Open
• Style/Alias
• Style/ArrayIntersect
• Style/ArrayJoin
• Style/BarePercentLiterals
• Style/BeginBlock
• Style/BlockDelimiters
• Style/CaseEquality
• Style/ClassAndModuleChildren
• Style/ClassCheck
• Style/CommandLiteral
• Style/CommentAnnotation
• Style/ComparableClamp
• Style/ConcatArrayLiterals
• Style/ConditionalAssignment
• Style/DataInheritance
• Style/DateTime
• Style/DirEmpty
• Style/EachForSimpleLoop
• Style/EachWithObject
• Style/EmptyCaseCondition
• Style/EmptyElse
• Style/EmptyHeredoc
• Style/EmptyLiteral
• Style/EndBlock
• Style/EvenOdd
• Style/ExactRegexpMatch
• Style/ExplicitBlockArgument
• Style/FileEmpty
• Style/For
• Style/FormatString
• Style/GlobalStdStream
• Style/IdenticalConditionalBranches
• Style/IfInsideElse
• Style/IfUnlessModifierOfIfUnless
• Style/IfWithBooleanLiteralBranches
• Style/IfWithSemicolon
• Style/InPatternThen
• Style/InfiniteLoop
• Style/InvertibleUnlessCondition
• Style/LambdaCall
• Style/LineEndConcatenation
• Style/MethodCallWithArgsParentheses
• Style/MethodCallWithoutArgsParentheses
• Style/MinMaxComparison
• Style/MissingRespondToMissing
• Style/ModuleFunction
• Style/MultilineIfThen
• Style/MultilineMemoization
• Style/MultilineTernaryOperator
• Style/NegatedIf
• Style/NegatedWhile
• Style/NestedFileDirname
• Style/NestedModifier
• Style/NestedParenthesizedCalls
• Style/NestedTernaryOperator
• Style/NilComparison
• Style/NonNilCheck
• Style/Not
• Style/NumericLiteralPrefix
• Style/OneLineConditional
• Style/OperatorMethodCall
• Style/OptionalArguments
• Style/ParallelAssignment
• Style/ParenthesesAroundCondition
• Style/PercentQLiterals
• Style/PerlBackrefs
• Style/PreferredHashMethods
• Style/Proc
• Style/QuotedSymbols
• Style/RaiseArgs
• Style/RedundantArrayConstructor
• Style/RedundantCapitalW
• Style/RedundantConstantBase
• Style/RedundantCurrentDirectoryInPath
• Style/RedundantDoubleSplatHashBraces
• Style/RedundantEach
• Style/RedundantException
• Style/RedundantFilterChain
• Style/RedundantFreeze
• Style/RedundantHeredocDelimiterQuotes
• Style/RedundantInterpolation
• Style/RedundantLineContinuation
• Style/RedundantParentheses
• Style/RedundantPercentQ
• Style/RedundantRegexpArgument
• Style/RedundantRegexpConstructor
• Style/RedundantSelf
• Style/RedundantSortBy
• Style/RedundantStringEscape
• Style/RegexpLiteral
• Style/RescueModifier
• Style/ReturnNil
• Style/ReturnNilInPredicateMethodDefinition
• Style/SafeNavigation
• Style/Sample
• Style/SelfAssignment
• Style/SignalException
• Style/SingleLineDoEndBlock
• Style/SingleLineMethods
• Style/SpecialGlobalVars
• Style/StabbyLambdaParentheses
• Style/StringLiterals
• Style/StringLiteralsInInterpolation
• Style/Strip
• Style/SuperWithArgsParentheses
• Style/SymbolArray
• Style/SymbolProc
• Style/TernaryParentheses
• Style/TrailingCommaInArguments
• Style/TrailingCommaInArrayLiteral
• Style/TrailingCommaInHashLiteral
• Style/TrivialAccessors
• Style/WhenThen
• Style/WhileUntilDo
• Style/WhileUntilModifier
• Style/WordArray
• Style/YAMLFileRead
• `Style/ZeroLengthPredicate``