detekt v2.0.0-alpha.3

2.0.0-alpha.3 - 2026-04-24

This is an alpha release of Detekt 2.0.0. Is built against Kotlin 2.3.21, Gradle 9.3.1, AGP 9.1.1 and is tested against JDK 25.

As of this release, the workaround of disabling the new DSL and built-in Kotlin via gradle.properties for AGP 9.x projects is no longer required.

Notable Changes

• Bump Kotlin to v2.3.21 - #9272
• Bump AGP to v9.1.1 - #9244
• Add support for AGP 9 built-in Kotlin - #9100
• Rule UnnecessaryFullyQualifiedName now requires full mode to run - #9061
• Add new rule: UnnecessaryRun - #7428

Breaking Changes

• Remove DetektProgressListener from our public API - #9221
• Remove InvalidConfigurationError from our public API - #8994

Changelog

• UseOrEmpty - Fix AA type leaks - #9263
• ForbiddenNamedParam - Fix AA type leaks - #9262
• UnusedVariable - Fix AA type leaks - #9260
• UnnecessaryNotNullOperator - Fix AA type leaks - #9259
• Deprecation - Fix AA type leaks - #9258
• NestedScopeFunctions - Fix AA type leaks - #9257
• Suggest similar property names for misspelled config properties - #9250
• MagicNumber DslGradleRunner test fix - #9245
• Don't forbid use of java.lang.annotation.Inherited annotation by default - #9224
• Fixes #9017 - false positive with name collisions - #9223
• Optimize how we get project statistics - #9217
• Rename ProjectComplexityProcessor to ProjectCyclomaticComplexityProcessor - #9213
• Add ignoreClass config to MissingUseCall - #9205
• Remove LicenseHeaderLoaderExtension from the list of processors - #9204
• cli: Improve messages and exception types of --report - #9203
• Validate --classpath with JCommander - #9202
• System-dependent path separators - #9199
• Do not report IgnoredReturnValue on lambda invocation that returns Unit - #9192
• Point to valOrVarKeyword for reporting the issue - #9191
• Check Throwable class - #9190
• Do no report when parent has class - #9189
• Add support of indent_style in ktlint Indention rule - #9180
• Add severity to different md, html reports - #9167
• Check local class which can't be converted to interface - #9166
• Inline yaml config in the test - #9154
• Tests: Don't check compilation errors with compile-test-snippets=false - #9153
• YamlConfig.load returns YamlConfig instead of Config - #9151
• Generator: The --config flag value should be a directory or it shouldn't exist - #9131
• Fix broken test JvmSpec - #9129
• Performance improvement - consolidated KaLibraryModules - #9127
• Print cli arguments with debug = true - #9126
• MissingUseCall: Fix false negative for checkNotNull/requireNotNull - #9123
• Make functionalTest os dependent - #9098
• Fix false positive for ExplicitCollectionElementAccessMethod with lambdas - #9096
• Expose only LanguageVersionSettings instead of CompilerConfiguration - #9092
• Remove project from EnvironmentFacade - #9089
• Ensure that AA knows types of excluded files - #9082
• Updated to using Gradle's lazy APIs - #9080
• Simplify KotlinEnvironmentContainer - #9077
• Reduce calls to analyze in MapGetWithNotNullAssertionOperator - #9067
• Report MapGetWithNonNullAssertionOperator violations on MutableMaps - #9065
• Fix ExplicitCollectionElementAccessMethodSpec for unresolved types - #9059
• Allow external dependencies in analysis tests - #9051
• Improve exception handling on YamlConfig - #9048
• Remove YamlConfig.load(Path) - #9047
• Refine AbstractClassCanBeInterface treatment of open properties - #9043
• rename Claude.md to CLAUDE.md for cross-platform compatibility - #9033
• Clarify CommentOverPrivate... renames in detekt 2 - #9025
• Exclude generated sources from default sources - #9019
• fix(UnusedVariable): recognize destructured lambda parameters as used - #9015
• Replace Lifecycle.bindingProvider by a private function and rename it to validateClasspath - #9003
• Remove unnecessary interface - #9002
• Remove dependecy of :detekt-test with :detekt-core - #8987
• Move yamlConfig functions to :detekt-core - #8976
• Only print paths of reports when detektion fails - #8560

Dependency Updates

• Bump Kotlin 2.3.20 - #8959
• Bump AGP to v9.1.0 - #9110
• Add coroutinesCore Intellij to the classpath - #9176
• chore: update Kotlin 2.3.20-RC2 → 2.3.20 - #9160
• chore(deps): update plugin dev.drewhamilton.poko to v0.22.0 - #9159
• Make KotlinAnalysisApiEngine AutoCloseable - #9144
• fix(deps): update kotlin monorepo to v2.3.10 - #9037

Housekeeping & Refactorings

• Don't use paths to read files from resources/ - #9175
• Remove unnecessary test nesting - #9150

Contributors

We would like to thank the following contributors that made this release possible: @3flex, @BraisGabin, @FletchMcKee, @TWiStErRob, @UnguidedFreedom, @atulgpt, @cortinico, @fru1tworld, @jonapoul, @matejdro, @mirkoalicastro, @picklebento, @t-kameyama, @travisMiehm