I recently changed my project to 1.9.20-Beta2, att...

# k2-adopters

[Andrey Tabakov]

I recently changed my project to 1.9.20-Beta2, attempted to start compileProductionExecutableKotlinJs gradle task, and then received this error (see comment for full stacktrace):

java.lang.ClassCastException: class org.jetbrains.kotlin.ir.declarations.impl.IrTypeParameterImpl cannot be cast to class org.jetbrains.kotlin.ir.declarations.IrClass (org.jetbrains.kotlin.ir.declarations.impl.IrTypeParameterImpl and org.jetbrains.kotlin.ir.declarations.IrClass are in unnamed module of loader 'app')

it worked perfectly with 1.9.10, any workaround?

[Andrey Tabakov]

java.lang.ClassCastException: class org.jetbrains.kotlin.ir.declarations.impl.IrTypeParameterImpl cannot be cast to class org.jetbrains.kotlin.ir.declarations.IrClass (org.jetbrains.kotlin.ir.declarations.impl.IrTypeParameterImpl and org.jetbrains.kotlin.ir.declarations.IrClass are in unnamed module of loader 'app')
	at org.jetbrains.kotlin.ir.backend.js.dce.JsUsefulDeclarationProcessor$bodyVisitor$1.visitCall(JsUsefulDeclarationProcessor.kt:74)
	at org.jetbrains.kotlin.ir.backend.js.dce.JsUsefulDeclarationProcessor$bodyVisitor$1.visitCall(JsUsefulDeclarationProcessor.kt:32)
	at org.jetbrains.kotlin.ir.expressions.IrCall.accept(IrCall.kt:26)
	at org.jetbrains.kotlin.ir.expressions.IrReturn.acceptChildren(IrReturn.kt:29)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitElement(UsefulDeclarationProcessor.kt:43)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitElement(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.visitors.IrElementVisitor$DefaultImpls.visitExpression(IrElementVisitor.kt:156)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitExpression(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitExpression(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.visitors.IrElementVisitor$DefaultImpls.visitReturn(IrElementVisitor.kt:282)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitReturn(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitReturn(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.expressions.IrReturn.accept(IrReturn.kt:26)
	at org.jetbrains.kotlin.ir.expressions.IrBlockBody.acceptChildren(IrBlockBody.kt:28)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitElement(UsefulDeclarationProcessor.kt:43)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitElement(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.visitors.IrElementVisitor$DefaultImpls.visitBody(IrElementVisitor.kt:159)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitBody(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitBody(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.visitors.IrElementVisitor$DefaultImpls.visitBlockBody(IrElementVisitor.kt:163)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitBlockBody(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor$BodyVisitorBase.visitBlockBody(UsefulDeclarationProcessor.kt:36)
	at org.jetbrains.kotlin.ir.expressions.IrBlockBody.accept(IrBlockBody.kt:25)
	at org.jetbrains.kotlin.ir.backend.js.dce.UsefulDeclarationProcessor.collectDeclarations(UsefulDeclarationProcessor.kt:262)
	at org.jetbrains.kotlin.ir.backend.js.dce.DceKt.eliminateDeadDeclarations(Dce.kt:35)
	at org.jetbrains.kotlin.ir.backend.js.OptimizationsKt.optimizeProgramByIr(optimizations.kt:26)
	at org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer.makeJsCodeGenerator(IrModuleToJsTransformer.kt:201)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.makeJsCodeGenerator(K2JsIrCompiler.kt:130)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler$Ir2JsTransformer.compileAndTransformIrNew(K2JsIrCompiler.kt:134)
	at org.jetbrains.kotlin.cli.js.K2JsIrCompiler.doExecute(K2JsIrCompiler.kt:391)
	at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:181)
	at org.jetbrains.kotlin.cli.js.K2JSCompiler.doExecute(K2JSCompiler.java:72)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:104)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:48)
	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1523)

[Andrey Tabakov]

it fails even with:

js(IR) {
    browser {
        dceTask{
            this.dceOptions.devMode = true
        }
    }
}

[anton.bannykh]

cc @Artem Kobzar

[Ilya Goncharov [JB]]

BTW, dceTask is senseless with IR compiler. It worked only with legacy compiler.
For IR you can manage via development or production task,
production task run with DCE and minification of member names

[andylamax]

@Ilya Goncharov [JB] does production run with DCE even for binaries.libraries()?

[Ilya Goncharov [JB]]

@andylamax Yes, DCE works for all compileProduction*KotlinJs