State of the Union Nicola Corti @cortinico 

Nicola Corti Kotlin GDE Detekt Maintainer twitter.com/cortinico github.com/cortinico ncorti.com The Developers’ Bakery Podcast thebakery.dev 

What is ? 

What is ? 

What is ? 

220 Rules 

Rulesets 

Rulesets • comments AbsentOrWrongFileLicense CommentOverPrivateFunction CommentOverPrivateProperty DeprecatedBlockTag EndOfSentenceFormat UndocumentedPublicClass UndocumentedPublicFunction UndocumentedPublicProperty 

Rulesets • comments • complexity ComplexCondition ComplexInterface ComplexMethod LabeledExpression LargeClass LongMethod LongParameterList MethodOverloading NamedArguments NestedBlockDepth ReplaceSafeCallChainWithRun StringLiteralDuplication TooManyFunctions 

Rulesets • comments • complexity • coroutines GlobalCoroutineUsage RedundantSuspendModifier SleepInsteadOfDelay SuspendFunWith"FlowReturnType 

Rulesets • comments • complexity • coroutines • empty-blocks EmptyCatchBlock EmptyClassBlock EmptyDefaultConstructor EmptyDoWhileBlock EmptyElseBlock EmptyFinallyBlock EmptyForBlock EmptyFunctionBlock EmptyIfBlock EmptyInitBlock EmptyKtFile EmptySecondaryConstructor EmptyTryBlock EmptyWhenBlock EmptyWhileBlock 

Rulesets • comments • complexity • coroutines • empty-blocks • exceptions ExceptionRaisedInUnexpectedLocation InstanceOfCheckForException NotImplementedDeclaration ObjectExtendsThrowable PrintStackTrace RethrowCaughtException ReturnFromFinally SwallowedException ThrowingExceptionFromFinally ThrowingExceptionInMain ThrowingExceptionsWithoutMessage ThrowingNewInstanceOfSameException TooGenericExceptionCaught TooGenericExceptionThrown 

Rulesets • comments • complexity • coroutines • empty-blocks • exceptions • naming ClassNaming ConstructorParameterNaming EnumNaming ForbiddenClassName FunctionMaxLength FunctionMinLength FunctionNaming FunctionParameterNaming InvalidPackageDeclaration MatchingDeclarationName MemberNameEqualsClassName NoNameShadowing NonBooleanPropertyPrefixedWithIs ObjectPropertyNaming PackageNaming TopLevelPropertyNaming VariableMaxLength VariableMinLength VariableNaming 

Rulesets • comments • complexity • coroutines • empty-blocks • exceptions • naming • performance ArrayPrimitive ForEachOnRange SpreadOperator UnnecessaryTemporaryInstantiation 

Rulesets • comments • complexity • coroutines • empty-blocks • exceptions • naming • performance • potential-bugs CastToNullableType Deprecation DontDowncastCollectionTypes DoubleMutabilityForCollection DuplicateCaseInWhenExpression EqualsAlwaysReturnsTrueOrFalse EqualsWithHashCodeExist ExitOutsideMain ExplicitGarbageCollectionCall HasPlatformType IgnoredReturnValue ImplicitDefaultLocale ImplicitUnitReturnType InvalidRange IteratorHasNextCallsNextMethod IteratorNotThrowingNoSuchElementException LateinitUsage MapGetWithNotNullAssertionOperator MissingWhenCase NullableToStringCall RedundantElseInWhen UnconditionalJumpStatementInLoop UnnecessaryNotNullOperator UnnecessarySafeCall UnreachableCatchBlock UnreachableCode UnsafeCallOnNullableType UnsafeCast UnusedUnaryOperator UselessPostfixExpression WrongEqualsTypeParameter 

Rulesets • comments • complexity • coroutines • empty-blocks • exceptions • naming • performance • potential-bugs • style ClassOrdering CollapsibleIfStatements DataClassContainsFunctions DataClassShouldBeImmutable DestructuringDeclarationWithTooManyEntries EqualsNullCall EqualsOnSignatureLine ExplicitCollectionElementAccessMethod ExplicitItLambdaParameter ExpressionBodySyntax ForbiddenComment ForbiddenImport ForbiddenMethodCall ForbiddenPublicDataClass ForbiddenVoid FunctionOnlyReturningConstant LibraryCodeMustSpecifyReturnType LibraryEntitiesShouldNotBePublic LoopWithTooManyJumpStatements MagicNumber MandatoryBracesIfStatements MandatoryBracesLoops MaxLineLength MayBeConst ModifierOrder MultilineLambdaItParameter NestedClassesVisibility NewLineAtEndOfFile NoTabs ObjectLiteralToLambda OptionalAbstractKeyword OptionalUnit OptionalWhenBraces PreferToOverPairSyntax ProtectedMemberInFinalClass RedundantExplicitType RedundantHigherOrderMapUsage RedundantVisibilityModifierRule ReturnCount SafeCast SerialVersionUIDInSerializableClass SpacingBetweenPackageAndImports ThrowsCount TrailingWhitespace UnderscoresInNumericLiterals UnnecessaryAbstractClass UnnecessaryAnnotationUseSiteTarget UnnecessaryApply UnnecessaryFilter UnnecessaryInheritance UnnecessaryLet UnnecessaryParentheses UntilInsteadOfRangeTo UnusedImports UnusedPrivateClass UnusedPrivateMember UseArrayLiteralsInAnnotations UseCheckNotNull UseCheckOrError UseDataClass UseEmptyCounterpart UseIfEmptyOrIfBlank UseIfInsteadOfWhen UseIsNullOrEmpty UseOrEmpty UseRequire UseRequireNotNull UselessCallOnNotNull UtilityClassWithPublicConstructor VarCouldBeVal WildcardImport 

UnusedPrivateMember 

UnusedPrivateMember class Sample { private val aMember = "^^" private val anotherMember = "U.U" } 

UnusedPrivateMember class Sample { private val aMember = "^^" private val anotherMember = "U.U" fun main() { println(aMember) } } Private property `anotherMember` is unused. 

MagicNumber 

MagicNumber fun main() { } 

MagicNumber fun main() { if (Random.nextInt() > 42) { println("🐋") } } This expression contains a magic number. Consider defining it to a well named constant. 

Documentation 

Documentation /** * This rule detects and reports usages of magic numbers in the code. * Prefer defining constants with clear names * describing what the magic number means. * 

Documentation /** * This rule detects and reports usages of magic numbers in the code. * Prefer defining constants with clear names * describing what the magic number means. * * * class User { * * fun checkName(name: String) { * if (name.length > 42) { * throw IllegalArgumentException("username is too long") * } * // ... * } * } * 

Documentation /** * This rule detects and reports usages of magic numbers in the code. * Prefer defining constants with clear names * describing what the magic number means. * * * class User { * * fun checkName(name: String) { * if (name.length > 42) { * throw IllegalArgumentException("username is too long") * } * // ... * } * } * 

* if (name.length > 42) { * throw IllegalArgumentException("username is too long") * } * // ... * } * } * * * * * class User { * * fun checkName(name: String) { * if (name.length > MAX_USERNAME_SIZE) { * throw IllegalArgumentException("username is too long") * } * // ... * } * * companion object { * private const val MAX_USERNAME_SIZE = 42 * } * } * */ 

* } * } * * * * * class User { * * fun checkName(name: String) { * if (name.length > MAX_USERNAME_SIZE) { * throw IllegalArgumentException("username is too long") * } * // ... * } * * companion object { * private const val MAX_USERNAME_SIZE = 42 * } * } * */ @Suppress("TooManyFunctions") @ActiveByDefault(since = "1.0.0") class MagicNumber(config: Config = Config.empty) : Rule(config) { 

* } * } * * * * * class User { * * fun checkName(name: String) { * if (name.length > MAX_USERNAME_SIZE) { * throw IllegalArgumentException("username is too long") * } * // ... * } * * companion object { * private const val MAX_USERNAME_SIZE = 42 * } * } * */ @Suppress("TooManyFunctions") @ActiveByDefault(since = "1.0.0") class MagicNumber(config: Config = Config.empty) : Rule(config) { 

Documentation 

Documentation 

Documentation 

Documentation 

detekt.yml 

build: maxIssues: 0 excludeCorrectable: false weights: # complexity: 2 # LongParameterList: 1 # style: 1 # comments: 1 config: validation: true warningsAsErrors: false # when writing own rules with new properties, exclude the property path e.g.: 'my_rule_set,."*>."*>[my_property]' excludes: '' processors: active: true exclude: - 'DetektProgressListener' # - 'KtFileCountProcessor' # - 'PackageCountProcessor' # - 'ClassCountProcessor' # - 'FunctionCountProcessor' # - 'PropertyCountProcessor' detekt.yml 

excludes: ['"**'] LibraryEntitiesShouldNotBePublic: active: true excludes: ['"**'] LoopWithTooManyJumpStatements: active: true maxJumpCount: 1 MagicNumber: active: true excludes: ['**/test/**', '**/androidTest/**', '**/commonTest/**', '**/jvmTest/**', '**/jsTest/**', '**/ iosTest/**'] ignoreNumbers: ['-1', '0', '1', '2'] ignoreHashCodeFunction: true ignorePropertyDeclaration: false ignoreLocalVariableDeclaration: false ignoreConstantDeclaration: true ignoreCompanionObjectPropertyDeclaration: true ignoreAnnotation: false ignoreNamedArgument: true ignoreEnums: false ignoreRanges: false ignoreExtensionFunctions: true MandatoryBracesIfStatements: active: false MandatoryBracesLoops: active: false detekt.yml 

excludes: ['"**'] LibraryEntitiesShouldNotBePublic: active: true excludes: ['"**'] LoopWithTooManyJumpStatements: active: true maxJumpCount: 1 MagicNumber: active: true excludes: ['**/test/**', '**/androidTest/**', '**/commonTest/**', '**/jvmTest/**', '**/jsTest/**', '**/ iosTest/**'] ignoreNumbers: ['-1', '0', '1', '2'] ignoreHashCodeFunction: true ignorePropertyDeclaration: false ignoreLocalVariableDeclaration: false ignoreConstantDeclaration: true ignoreCompanionObjectPropertyDeclaration: true ignoreAnnotation: false ignoreNamedArgument: true ignoreEnums: false ignoreRanges: false ignoreExtensionFunctions: true MandatoryBracesIfStatements: active: false MandatoryBracesLoops: active: false detekt.yml 

UnnecessaryNotNullOperator 

UnnecessaryNotNullOperator val zero = 0 val answer = zero.plus(42) 

UnnecessaryNotNullOperator val zero = 0 val answer = zero""!!.plus(42) 

UnnecessaryNotNullOperator val zero = 0 val answer = zero""!!.plus(42) : Int 

UnnecessaryNotNullOperator val zero = 0 val answer = zero""!!.plus(42) `zero"!!` contains an unnecessary not-null ("!!) operators 

DoubleMutabilityForCollection 

DoubleMutabilityForCollection fun main() { var hobbits = mutableListOf("Frodo", "Sam", "Merry", "Pippin") } Variable `hobbits` is declared as `var` with a mutable type `kotlin.collections.MutableList`. Consider using `val` or an immutable collection type 

ForbiddenMethodCall 

ForbiddenMethodCall style: ForbiddenMethodCall: active: false methods: ['kotlin.io.println', 'kotlin.io.print'] 

ForbiddenMethodCall style: ForbiddenMethodCall: active: true methods: ['kotlin.io.println', 'kotlin.io.print'] 

ForbiddenMethodCall class Sample { private val aMember = "^^" private val anotherMember = "U.U" } style: ForbiddenMethodCall: active: true methods: ['kotlin.io.println', 'kotlin.io.print'] 

ForbiddenMethodCall class Sample { private val aMember = "^^" private val anotherMember = "U.U" fun main() { println(aMember) } } style: ForbiddenMethodCall: active: true methods: ['kotlin.io.println', 'kotlin.io.print'] The method kotlin.io.println(String) has been forbidden in the Detekt config. 

Suppressing 

Suppressing fun main() { if (Random.nextInt() > 42) { println("🐋") } } 

Suppressing fun main() { @Suppress("MagicNumber") if (Random.nextInt() > 42) { println("🐋") } } 

Suppressing @Suppress("MagicNumber") fun main() { if (Random.nextInt() > 42) { println("🐋") } } 

Suppressing @file:Suppress(“MagicNumber”) fun main() { if (Random.nextInt() > 42) { println("🐋") } } 

Detekt CLI 

Custom Rules 

• Ktlint Wrapper • Offered as Custom rules (formatting) • Only rules offering autoCorrection formatting: android: false autoCorrect: true AnnotationOnSeparateLine: AnnotationSpacing: ArgumentListWrapping: ChainWrapping: CommentSpacing: EnumEntryNameCase: Filename: FinalNewline: ImportOrdering: Indentation: MaximumLineLength: ModifierOrdering: MultiLineIfElse: NoBlankLineBeforeRbrace: NoConsecutiveBlankLines: NoEmptyClassBody: NoEmptyFirstLineInMethodBlock: NoLineBreakAfterElse: NoLineBreakBeforeAssignment: NoMultipleSpaces: NoSemicolons: NoTrailingSpaces: NoUnitReturn: NoUnusedImports: NoWildcardImports: PackageName: ParameterListWrapping: SpacingAroundAngleBrackets: SpacingAroundColon: SpacingAroundComma: SpacingAroundCurly: SpacingAroundDot: SpacingAroundDoubleColon: SpacingAroundKeyword: SpacingAroundOperators: SpacingAroundParens: SpacingAroundRangeOperator: SpacingAroundUnaryOperator: SpacingBetweenDeclarationsWithAnnotations: SpacingBetweenDeclarationsWithComments: StringTemplate: 

• Ktlint Wrapper • Offered as Custom rules (formatting) • Only rules offering autoCorrection formatting: android: false autoCorrect: true AnnotationOnSeparateLine: AnnotationSpacing: ArgumentListWrapping: ChainWrapping: CommentSpacing: EnumEntryNameCase: Filename: FinalNewline: ImportOrdering: 

formatting: active: true NoWildcardImports: active: true NoUnusedImports: active: true style: WildcardImport: active: true excludeImports: [‘java.util.*'] UnusedImports: active: false 

formatting: active: true NoWildcardImports: active: true NoUnusedImports: active: true style: WildcardImport: active: true excludeImports: [‘java.util.*'] UnusedImports: active: false 

formatting: active: true NoWildcardImports: active: true NoUnusedImports: active: true autoCorrect: true style: WildcardImport: active: true excludeImports: [‘java.util.*'] UnusedImports: active: false 

Custom Rules 

Custom Rules class MyCustomRuleSetProvider : RuleSetProvider { override val ruleSetId = "my-rules" override fun instance(config: Config) = RuleSet( ruleSetId, listOf(MyCustomRule(config)) ) } com.example.MyCustomRuleSetProvider class MyCustomRule( config: Config = Config.empty ) : Rule(config) { override val issue = Issue( "//… ) } 

Custom Rules 

Integrations 

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SARIF - Static Analysis Result Interchange Format https://sarifweb.azurewebsites.net/ 

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Type Resolution 

Type Resolution fun main() { if (Random.nextInt() > 42) { println("🐋") } } val zero = 0 val answer = zero""!!.plus(42) UnnecessaryNotNullOperator MagicNumber 

Type Resolution fun main() { if (Random.nextInt() > 42) { println("🐋") } } val zero = getANumber() val answer = zero""!!.plus(42) UnnecessaryNotNullOperator MagicNumber 

Type Resolution fun main() { if (Random.nextInt() > 42) { println("🐋") } } val zero = getANumber() val answer = zero""!!.plus(42) UnnecessaryNotNullOperator MagicNumber : Int? : Int UnnecessaryNotNullOperator needs to know the return type of getANumber() 

Rules w/ Type Resolution 

Rules w/ Type Resolution /** * Reports unnecessary not-null operator usage ("!!) that can be removed by the user. * * * val a = 1 * val b = a"!! * " * * * val a = 1 * val b = a * " "*/ @RequiresTypeResolution @ActiveByDefault(since = "1.16.0") class UnnecessaryNotNullOperator(config: Config = Config.empty) : Rule(config) { 

Rules w/ Type Resolution @ActiveByDefault(since = "1.16.0") class UnnecessaryNotNullOperator(config: Config = Config.empty) : Rule(config) { override val issue: Issue = Issue( "UnnecessaryNotNullOperator", Severity.Defect, "Unnecessary not-null unary operator ("!!) detected.", Debt.FIVE_MINS ) override fun visitUnaryExpression(expression: KtUnaryExpression) { super.visitUnaryExpression(expression) if (bindingContext "== BindingContext.EMPTY) return "// Type Resolution is enabled here } } 

Rules w/ Type Resolution @ActiveByDefault(since = "1.16.0") class UnnecessaryNotNullOperator(config: Config = Config.empty) : Rule(config) { override val issue: Issue = Issue( "UnnecessaryNotNullOperator", Severity.Defect, "Unnecessary not-null unary operator ("!!) detected.", Debt.FIVE_MINS ) override fun visitUnaryExpression(expression: KtUnaryExpression) { super.visitUnaryExpression(expression) if (bindingContext "== BindingContext.EMPTY) return "// Type Resolution is enabled here } } 

Rules w/ Type Resolution 

Using Type Resolution 

Using Type Resolution 

Using Type Resolution 

Gradle 

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plugins { id("io.gitlab.arturbosch.detekt") version "1.17.1" } 

plugins { id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } 

plugins { id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } 

plugins { id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } $ ./gradlew tasks | grep detekt detekt detektBaseline detektGenerateConfig 

plugins { id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } $ ./gradlew tasks | grep detekt detekt detektBaseline detektGenerateConfig 

plugins { id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } $ ./gradlew tasks | grep detekt detekt detektBaseline detektGenerateConfig 

plugins { id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } $ ./gradlew tasks | grep detekt detekt detektBaseline detektGenerateConfig 

plugins { kotlin("jvm") id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } 

$ ./gradlew tasks | grep detekt detekt detektBaseline detektBaselineMain detektBaselineTest detektGenerateConfig detektMain detektTest plugins { kotlin("jvm") id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } 

$ ./gradlew tasks | grep detekt detekt detektBaseline detektBaselineMain detektBaselineTest detektGenerateConfig detektMain detektTest plugins { kotlin("jvm") id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } 

$ ./gradlew tasks | grep detekt detekt detektBaseline detektBaselineMain detektBaselineTest detektGenerateConfig detektMain detektTest plugins { kotlin("jvm") id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } 

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plugins { kotlin(“android") id(“com.android.application”) id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } 

plugins { kotlin(“android") id(“com.android.application”) id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } $ ./gradlew tasks | grep detekt app:detekt app:detektBaseline app:detektBaselineDebug app:detektBaselineDebugAndroidTest app:detektBaselineDebugUnitTest app:detektBaselineMain app:detektBaselineRelease app:detektBaselineReleaseUnitTest app:detektBaselineTest app:detektDebug app:detektDebugAndroidTest app:detektDebugUnitTest app:detektGenerateConfig app:detektMain app:detektRelease app:detektReleaseUnitTest app:detektTest 

plugins { kotlin(“android") id(“com.android.application”) id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } $ ./gradlew tasks | grep detekt app:detekt app:detektBaseline app:detektBaselineDebug app:detektBaselineDebugAndroidTest app:detektBaselineDebugUnitTest app:detektBaselineMain app:detektBaselineRelease app:detektBaselineReleaseUnitTest app:detektBaselineTest app:detektDebug app:detektDebugAndroidTest app:detektDebugUnitTest app:detektGenerateConfig app:detektMain app:detektRelease app:detektReleaseUnitTest app:detektTest 

plugins { kotlin(“android") id(“com.android.application”) id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } $ ./gradlew tasks | grep detekt app:detekt app:detektBaseline app:detektBaselineDebug app:detektBaselineDebugAndroidTest app:detektBaselineDebugUnitTest app:detektBaselineMain app:detektBaselineRelease app:detektBaselineReleaseUnitTest app:detektBaselineTest app:detektDebug app:detektDebugAndroidTest app:detektDebugUnitTest app:detektGenerateConfig app:detektMain app:detektRelease app:detektReleaseUnitTest app:detektTest 

plugins { kotlin(“android") id(“com.android.application”) id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } $ ./gradlew tasks | grep detekt app:detekt app:detektBaseline app:detektBaselineDebug app:detektBaselineDebugAndroidTest app:detektBaselineDebugUnitTest app:detektBaselineMain app:detektBaselineRelease app:detektBaselineReleaseUnitTest app:detektBaselineTest app:detektDebug app:detektDebugAndroidTest app:detektDebugUnitTest app:detektGenerateConfig app:detektMain app:detektRelease app:detektReleaseUnitTest app:detektTest 

Multiplatform 

Multiplatform plugins { kotlin(“multiplatform") id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } 

Multiplatform plugins { kotlin(“multiplatform") id("io.gitlab.arturbosch.detekt") version "1.17.1" } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } kotlin { jvm() android() ios() js() } 

Multiplatform $ ./gradlew tasks | grep detekt detekt detektAndroidDebug detektAndroidDebugAndroidTest detektAndroidDebugUnitTest detektAndroidRelease detektAndroidReleaseUnitTest detektBaseline detektBaselineAndroidDebug detektBaselineAndroidDebugAndroidTest detektBaselineAndroidDebugUnitTest detektBaselineAndroidRelease detektBaselineAndroidReleaseUnitTest detektBaselineIosArm64Main detektBaselineIosArm64Test detektBaselineIosX64Main detektBaselineIosX64Test detektBaselineJsMain detektBaselineJsTest detektBaselineJvmMain detektBaselineJvmTest detektBaselineMetadataCommonMain detektBaselineMetadataIosMain detektBaselineMetadataMain detektGenerateConfig detektIosArm64Main detektIosArm64Test detektIosX64Main detektIosX64Test detektJsMain detektJsTest detektJvmMain detektJvmTest detektMetadataCommonMain detektMetadataIosMain detektMetadataMain 

The Future 

./gradlew check detekt (no Type Resolution) compileKotlin 

detektMain (w/ Type Resolution) compileKotlin Runs another compilation Internally to resolve types ./gradlew check • Running two compilations is bad for performances • Misaligned compiler flags • Harder to get the correct class path every time (ViewBinding, etc.) 

detekt-compiler-plugin 

detekt-compiler-plugin plugins { kotlin("jvm") id("io.gitlab.arturbosch.detekt") version “…” } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } 

detekt-compiler-plugin plugins { kotlin("jvm") id("io.github.detekt.gradle.compiler-plugin") version “…” } repositories { mavenCentral() } detekt { config = files(“config/detekt/detekt.yml”) } 

compileKotlin Runs detekt during the compilation ./gradlew check • No more double compilation • Types Resolution close to the production code • No more custom tasks for every source set 

detekt-compiler-plugin 

detekt-compiler-plugin $ ./gradlew assemble 

detekt-compiler-plugin $ ./gradlew assemble > Task :compileKotlin FAILED w: Build failed with 1 weighted issues. e: warnings found and -Werror specified w: /Users/ncorti/oss/detekt-compiler-plugin/src/main/java/Sample.kt: (3, 21): MagicNumber: This expression contains a magic number. Consider defining it to a well named constant. FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':compileKotlin'. > Compilation error. See log for more details BUILD FAILED in 1s 1 actionable task: 1 executed 

detekt-compiler-plugin $ ./gradlew assemble > Task :compileKotlin FAILED w: Build failed with 1 weighted issues. e: warnings found and -Werror specified w: /Users/ncorti/oss/detekt-compiler-plugin/src/main/java/Sample.kt: (3, 21): MagicNumber: This expression contains a magic number. Consider defining it to a well named constant. FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':compileKotlin'. > Compilation error. See log for more details BUILD FAILED in 1s 1 actionable task: 1 executed 

The Community ❤ 

Where is ? • github.com/detekt/detekt • #detekt on KotlinLang • detekt.github.io/ • Discussions & Github Issues 

• Search for • Update documentation • Add more tests • Submit new rules ideas • Fix false positives/false negatives • Help with integrations • Test new versions (-SNAPSHOT) • Help with branding How to ? 

Who is ? 

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Thank you & Contribs are Welcome 🙏 Nicola Corti @cortinico