diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/loops/HeaderInfo.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/loops/HeaderInfo.kt
index f8de62dbdd4..547fc9a2315 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/loops/HeaderInfo.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/loops/HeaderInfo.kt
@@ -271,25 +271,25 @@ internal abstract class HeaderInfoBuilder(context: CommonBackendContext, private
     override fun visitElement(element: IrElement, data: IrCall?): HeaderInfo? = null
 
     /** Builds a [HeaderInfo] for iterable expressions that are calls (e.g., `.reversed()`, `.indices`. */
-    override fun visitCall(iterable: IrCall, iteratorCall: IrCall?): HeaderInfo? {
+    override fun visitCall(expression: IrCall, data: IrCall?): HeaderInfo? {
         // Return the HeaderInfo from the first successful match.
         // First, try to match a `reversed()` or `withIndex()` call.
-        val callHeaderInfo = callHandlers.firstNotNullResult { it.handle(iterable, iteratorCall, null, scopeOwnerSymbol()) }
+        val callHeaderInfo = callHandlers.firstNotNullResult { it.handle(expression, data, null, scopeOwnerSymbol()) }
         if (callHeaderInfo != null)
             return callHeaderInfo
 
         // Try to match a call to build a progression (e.g., `.indices`, `downTo`).
-        val progressionType = ProgressionType.fromIrType(iterable.type, symbols)
+        val progressionType = ProgressionType.fromIrType(expression.type, symbols)
         val progressionHeaderInfo =
-            progressionType?.run { progressionHandlers.firstNotNullResult { it.handle(iterable, iteratorCall, this, scopeOwnerSymbol()) } }
+            progressionType?.run { progressionHandlers.firstNotNullResult { it.handle(expression, data, this, scopeOwnerSymbol()) } }
 
-        return progressionHeaderInfo ?: super.visitCall(iterable, iteratorCall)
+        return progressionHeaderInfo ?: super.visitCall(expression, data)
     }
 
     /** Builds a [HeaderInfo] for iterable expressions not handled in [visitCall]. */
-    override fun visitExpression(iterable: IrExpression, iteratorCall: IrCall?): HeaderInfo? {
-        return expressionHandlers.firstNotNullResult { it.handle(iterable, iteratorCall, null, scopeOwnerSymbol()) }
-            ?: super.visitExpression(iterable, iteratorCall)
+    override fun visitExpression(expression: IrExpression, data: IrCall?): HeaderInfo? {
+        return expressionHandlers.firstNotNullResult { it.handle(expression, data, null, scopeOwnerSymbol()) }
+            ?: super.visitExpression(expression, data)
     }
 }
 
@@ -339,4 +339,4 @@ internal class NestedHeaderInfoBuilderForWithIndex(context: CommonBackendContext
         DefaultIterableHandler(context),
         DefaultSequenceHandler(context),
     )
-}
\ No newline at end of file
+}
diff --git a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/DumperVerifier.kt b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/DumperVerifier.kt
index 092df66b043..db767d4bacf 100644
--- a/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/DumperVerifier.kt
+++ b/compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/phaser/DumperVerifier.kt
@@ -56,7 +56,7 @@ fun <Data, Context> makeVerifyAction(verifier: (Context, Data) -> Unit): Action<
             verifier(context, data)
     }
 
-fun dumpIrElement(actionState: ActionState, data: IrElement, context: Any?): String {
+fun dumpIrElement(actionState: ActionState, data: IrElement, @Suppress("UNUSED_PARAMETER") context: Any?): String {
     val beforeOrAfterStr = actionState.beforeOrAfter.name.toLowerCaseAsciiOnly()
 
     var dumpText: String = ""
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/MutableController.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/MutableController.kt
index 1bc3b9710bd..fb71154352f 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/MutableController.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/MutableController.kt
@@ -161,7 +161,7 @@ open class MutableController(val context: JsIrBackendContext, val lowerings: Lis
     private var restricted: Boolean = false
     private var declarationListsRestricted = false
 
-    private inline fun <T> (() -> T).withRestrictions(
+    private fun <T> (() -> T).withRestrictions(
         newRestrictedToDeclaration: IrDeclaration? = null,
         newBodiesEnabled: Boolean? = null,
         newRestricted: Boolean? = null,
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/export/ExportModelGenerator.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/export/ExportModelGenerator.kt
index 2cee7929dc6..01147df89b9 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/export/ExportModelGenerator.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/export/ExportModelGenerator.kt
@@ -140,7 +140,7 @@ class ExportModelGenerator(val context: JsIrBackendContext) {
         klass: IrClass
     ): ExportedDeclaration? {
         when (val exportability = classExportability(klass)) {
-            is Exportability.Prohibited -> return error(exportability.reason)
+            is Exportability.Prohibited -> error(exportability.reason)
             is Exportability.NotNeeded -> return null
         }
 
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/CallableReferenceLowering.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/CallableReferenceLowering.kt
index 44de8ad3a2a..bbab07db60b 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/CallableReferenceLowering.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/CallableReferenceLowering.kt
@@ -357,7 +357,7 @@ class CallableReferenceLowering(private val context: CommonBackendContext) : Bod
         fun build(): Pair<IrClass, IrConstructor> {
             val clazz = buildReferenceClass()
             val ctor = createConstructor(clazz)
-            val invoke = createInvokeMethod(clazz)
+            createInvokeMethod(clazz)
             createNameProperty(clazz)
             // TODO: create name property for KFunction*
 
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/EnumClassLowering.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/EnumClassLowering.kt
index 1cdc682116a..b502f2a3993 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/EnumClassLowering.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/EnumClassLowering.kt
@@ -44,7 +44,7 @@ class EnumUsageLowering(val context: JsIrBackendContext) : BodyLoweringPass {
             override fun visitGetEnumValue(expression: IrGetEnumValue): IrExpression {
                 val enumEntry = expression.symbol.owner
                 val klass = enumEntry.parent as IrClass
-                return if (klass.isExternal) lowerExternalEnumEntry(enumEntry, klass) else lowerEnumEntry(enumEntry, klass)
+                return if (klass.isExternal) lowerExternalEnumEntry(enumEntry, klass) else lowerEnumEntry(enumEntry)
             }
         })
     }
@@ -78,7 +78,7 @@ class EnumUsageLowering(val context: JsIrBackendContext) : BodyLoweringPass {
             }
         }
 
-    private fun lowerEnumEntry(enumEntry: IrEnumEntry, klass: IrClass) =
+    private fun lowerEnumEntry(enumEntry: IrEnumEntry) =
         enumEntry.getInstanceFun!!.run { JsIrBuilder.buildCall(symbol) }
 }
 
@@ -350,7 +350,7 @@ class EnumEntryInstancesBodyLowering(val context: JsIrBackendContext) : BodyLowe
                 val index = (irBody as IrBlockBody).statements
                     .indexOfFirst { it is IrTypeOperatorCall && it.argument is IrDelegatingConstructorCall } + 1
 
-                (irBody as IrBlockBody).statements.add(index, context.createIrBuilder(container.symbol).run {
+                irBody.statements.add(index, context.createIrBuilder(container.symbol).run {
                     irSetField(null, entry.correspondingField!!, irGet(entryClass.thisReceiver!!))
                 })
             }
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/coroutines/AbstractSuspendFunctionsLowering.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/coroutines/AbstractSuspendFunctionsLowering.kt
index 553ae408248..65cff8f7a51 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/coroutines/AbstractSuspendFunctionsLowering.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/coroutines/AbstractSuspendFunctionsLowering.kt
@@ -52,6 +52,7 @@ abstract class AbstractSuspendFunctionsLowering<C : CommonBackendContext>(val co
 
     protected abstract fun IrBlockBodyBuilder.generateCoroutineStart(invokeSuspendFunction: IrFunction, receiver: IrExpression)
 
+    @Suppress("UNUSED_PARAMETER")
     protected fun initializeStateMachine(coroutineConstructors: List<IrConstructor>, coroutineClassThis: IrValueDeclaration) {
         // Do nothing by default
         // TODO find out if Kotlin/Native needs this method.
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/JsIntrinsicTransformers.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/JsIntrinsicTransformers.kt
index cea27d32e76..4c4070c8700 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/JsIntrinsicTransformers.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/JsIntrinsicTransformers.kt
@@ -187,7 +187,7 @@ class JsIntrinsicTransformers(backendContext: JsIrBackendContext) {
             }
 
             add(intrinsics.jsBoxIntrinsic) { call, context ->
-                val arg = translateCallArguments(call as IrCall, context).single()
+                val arg = translateCallArguments(call, context).single()
                 val inlineClass = call.getTypeArgument(0)!!.getInlinedClass()!!
                 val constructor = inlineClass.declarations.filterIsInstance<IrConstructor>().single { it.isPrimary }
                 JsNew(context.getNameForConstructor(constructor).makeRef(), listOf(arg))
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt
index f90504251e3..b13c5755714 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt
@@ -324,9 +324,6 @@ class NameTables(
             return sanitizeName(field.name.asString()) + "__error"
         }
 
-        require(name != null) {
-            "Can't find name for member field ${field.render()}"
-        }
         return name
     }
 
@@ -340,10 +337,6 @@ class NameTables(
             return sanitizeName(function.name.asString()) + "__error" // TODO one case is a virtual method of an abstract class with no implementation
         }
 
-        // TODO report backend error
-        require(name != null) {
-            "Can't find name for member function ${function.render()}"
-        }
         return name
     }
 
diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt
index 77654d0060f..3eb37a203a3 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt
@@ -631,6 +631,7 @@ class ExpressionCodegen(
 
     private fun handlePlusMinus(expression: IrSetVariable, value: IrExpression?, isMinus: Boolean): Boolean {
         if (value is IrConst<*> && value.kind == IrConstKind.Int) {
+            @Suppress("UNCHECKED_CAST")
             val delta = (value as IrConst<Int>).value
             val upperBound = Byte.MAX_VALUE.toInt() + (if (isMinus) 1 else 0)
             val lowerBound = Byte.MIN_VALUE.toInt() + (if (isMinus) 1 else 0)
diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/FunctionReferenceLowering.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/FunctionReferenceLowering.kt
index ac315a028bc..45b75db80e5 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/FunctionReferenceLowering.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/FunctionReferenceLowering.kt
@@ -249,7 +249,7 @@ internal class FunctionReferenceLowering(private val context: JvmBackendContext)
                 return
             }
 
-            SamEqualsHashCodeMethodsGenerator(backendContext, functionReferenceClass, samSuperType) { receiver ->
+            SamEqualsHashCodeMethodsGenerator(backendContext, functionReferenceClass, samSuperType) {
                 val internalClass = when {
                     isAdaptedReference -> backendContext.ir.symbols.adaptedFunctionReference
                     else -> backendContext.ir.symbols.functionReferenceImpl
diff --git a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/JvmOptimizationLowering.kt b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/JvmOptimizationLowering.kt
index 3916b621fb4..1921b36ef52 100644
--- a/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/JvmOptimizationLowering.kt
+++ b/compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/JvmOptimizationLowering.kt
@@ -78,25 +78,25 @@ class JvmOptimizationLowering(val context: JvmBackendContext) : FileLoweringPass
             // in another class then the one it is nested under in the IR.
             // TODO: Loosen this up for local functions for lambdas passed as an inline lambda
             // argument to an inline function. In that case the code does end up in the current class.
-            override fun visitFunction(declaration: IrFunction, currentClass: IrClass?): IrStatement {
+            override fun visitFunction(declaration: IrFunction, data: IrClass?): IrStatement {
                 val codeMightBeGeneratedInDifferentClass = declaration.isSuspend ||
                         declaration.isInline ||
                         declaration.origin == IrDeclarationOrigin.LOCAL_FUNCTION_FOR_LAMBDA
-                declaration.transformChildren(this, currentClass.takeUnless { codeMightBeGeneratedInDifferentClass })
+                declaration.transformChildren(this, data.takeUnless { codeMightBeGeneratedInDifferentClass })
                 return declaration
             }
 
-            override fun visitCall(expression: IrCall, currentClass: IrClass?): IrExpression {
-                expression.transformChildren(this, currentClass)
+            override fun visitCall(expression: IrCall, data: IrClass?): IrExpression {
+                expression.transformChildren(this, data)
 
                 removeIntTypeSafeCastsForEquality(expression)
 
                 if (expression.symbol.owner.origin == IrDeclarationOrigin.DEFAULT_PROPERTY_ACCESSOR) {
-                    if (currentClass == null) return expression
+                    if (data == null) return expression
                     val simpleFunction = (expression.symbol.owner as? IrSimpleFunction) ?: return expression
                     val property = simpleFunction.correspondingPropertySymbol?.owner ?: return expression
                     if (property.isLateinit) return expression
-                    return optimizePropertyAccess(expression, simpleFunction, property, currentClass)
+                    return optimizePropertyAccess(expression, simpleFunction, property, data)
                 }
 
                 if (isNegation(expression, context) && isNegation(expression.dispatchReceiver!!, context)) {
@@ -185,9 +185,9 @@ class JvmOptimizationLowering(val context: JvmBackendContext) : FileLoweringPass
                 return expression
             }
 
-            override fun visitWhen(expression: IrWhen, currentClass: IrClass?): IrExpression {
+            override fun visitWhen(expression: IrWhen, data: IrClass?): IrExpression {
                 val isCompilerGenerated = expression.origin == null
-                expression.transformChildren(this, currentClass)
+                expression.transformChildren(this, data)
                 // Remove all branches with constant false condition.
                 expression.branches.removeIf {
                     it.condition.isFalseConst() && isCompilerGenerated
@@ -329,19 +329,19 @@ class JvmOptimizationLowering(val context: JvmBackendContext) : FileLoweringPass
                 }
             }
 
-            override fun visitBlockBody(body: IrBlockBody, currentClass: IrClass?): IrBody {
-                body.transformChildren(this, currentClass)
+            override fun visitBlockBody(body: IrBlockBody, data: IrClass?): IrBody {
+                body.transformChildren(this, data)
                 removeUnnecessaryTemporaryVariables(body.statements)
                 return body
             }
 
-            override fun visitContainerExpression(expression: IrContainerExpression, currentClass: IrClass?): IrExpression {
-                expression.transformChildren(this, currentClass)
+            override fun visitContainerExpression(expression: IrContainerExpression, data: IrClass?): IrExpression {
+                expression.transformChildren(this, data)
                 removeUnnecessaryTemporaryVariables(expression.statements)
                 return expression
             }
 
-            override fun visitGetValue(expression: IrGetValue, currentClass: IrClass?): IrExpression {
+            override fun visitGetValue(expression: IrGetValue, data: IrClass?): IrExpression {
                 // Replace IrGetValue of an immutable temporary variable with a constant
                 // initializer with the constant initializer.
                 val variable = expression.symbol.owner
diff --git a/compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmBackendContext.kt b/compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmBackendContext.kt
index ef7f4678a1f..8b297aec694 100644
--- a/compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmBackendContext.kt
+++ b/compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmBackendContext.kt
@@ -9,9 +9,7 @@ import org.jetbrains.kotlin.backend.common.ir.Ir
 import org.jetbrains.kotlin.backend.common.ir.Symbols
 import org.jetbrains.kotlin.config.CompilerConfiguration
 import org.jetbrains.kotlin.descriptors.ModuleDescriptor
-import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
 import org.jetbrains.kotlin.ir.IrElement
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.backend.js.JsCommonBackendContext
 import org.jetbrains.kotlin.ir.backend.js.JsMapping
 import org.jetbrains.kotlin.ir.backend.js.JsSharedVariablesManager
@@ -21,19 +19,17 @@ import org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl
 import org.jetbrains.kotlin.ir.declarations.persistent.PersistentIrFactory
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
-import org.jetbrains.kotlin.ir.symbols.IrExternalPackageFragmentSymbol
 import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.impl.DescriptorlessExternalPackageFragmentSymbol
-import org.jetbrains.kotlin.ir.util.IdSignature
 import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.name.FqName
 
 class WasmBackendContext(
     val module: ModuleDescriptor,
     override val irBuiltIns: IrBuiltIns,
-    symbolTable: SymbolTable,
-    irModuleFragment: IrModuleFragment,
+    @Suppress("UNUSED_PARAMETER") symbolTable: SymbolTable,
+    @Suppress("UNUSED_PARAMETER") irModuleFragment: IrModuleFragment,
     val additionalExportedDeclarations: Set<FqName>,
     override val configuration: CompilerConfiguration
 ) : JsCommonBackendContext {
@@ -81,4 +77,4 @@ class WasmBackendContext(
         /*TODO*/
         print(message)
     }
-}
\ No newline at end of file
+}
diff --git a/compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/codegen/ExpressionTransformer.kt b/compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/codegen/ExpressionTransformer.kt
index 1f5ddfb3efd..dad1e9a5a83 100644
--- a/compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/codegen/ExpressionTransformer.kt
+++ b/compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/codegen/ExpressionTransformer.kt
@@ -106,8 +106,8 @@ class ExpressionTransformer : BaseTransformer<WasmInstruction, WasmCodegenContex
 
     override fun visitTypeOperator(expression: IrTypeOperatorCall, data: WasmCodegenContext): WasmInstruction {
         val wasmArgument = expressionToWasmInstruction(expression.argument, data)
-        when (expression.operator) {
-            IrTypeOperator.IMPLICIT_COERCION_TO_UNIT -> return wasmArgument
+        if (expression.operator == IrTypeOperator.IMPLICIT_COERCION_TO_UNIT) {
+            return wasmArgument
         }
         TODO("IrTypeOperatorCall:\n ${expression.dump()}")
     }
diff --git a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ArgumentsGenerationUtils.kt b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ArgumentsGenerationUtils.kt
index 2fd8dae8aff..98daabc6f35 100644
--- a/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ArgumentsGenerationUtils.kt
+++ b/compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/generators/ArgumentsGenerationUtils.kt
@@ -245,7 +245,7 @@ private fun StatementGenerator.generateReceiverForCalleeImportedFromObject(
 private fun StatementGenerator.generateVarargExpressionUsing(
     varargArgument: VarargValueArgument,
     valueParameter: ValueParameterDescriptor,
-    resolvedCall: ResolvedCall<*>, // TODO resolvedCall is required for suspend conversions, see KT-38604
+    @Suppress("UNUSED_PARAMETER") resolvedCall: ResolvedCall<*>, // TODO resolvedCall is required for suspend conversions, see KT-38604
     generateArgumentExpression: (KtExpression) -> IrExpression?
 ): IrExpression? {
     if (varargArgument.arguments.isEmpty()) {
diff --git a/compiler/ir/ir.tree.persistent/src/org/jetbrains/kotlin/ir/declarations/persistent/PersistentIrDeclarationBase.kt b/compiler/ir/ir.tree.persistent/src/org/jetbrains/kotlin/ir/declarations/persistent/PersistentIrDeclarationBase.kt
index 0d123eb3362..ee6c3eea510 100644
--- a/compiler/ir/ir.tree.persistent/src/org/jetbrains/kotlin/ir/declarations/persistent/PersistentIrDeclarationBase.kt
+++ b/compiler/ir/ir.tree.persistent/src/org/jetbrains/kotlin/ir/declarations/persistent/PersistentIrDeclarationBase.kt
@@ -74,6 +74,7 @@ interface PersistentIrElementBase<T : Carrier> : IrElement, Carrier {
 
     fun ensureLowered()
 
+    @Suppress("UNCHECKED_CAST")
     fun getCarrier(): T {
         stageController.currentStage.let { stage ->
             ensureLowered()
@@ -104,6 +105,7 @@ interface PersistentIrElementBase<T : Carrier> : IrElement, Carrier {
     }
 
     // TODO naming? e.g. `mutableCarrier`
+    @Suppress("UNCHECKED_CAST")
     fun setCarrier(): T {
         val stage = stageController.currentStage
 
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrFunctionFactory.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrFunctionFactory.kt
index 80c251a3fb8..495c0950cac 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrFunctionFactory.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrFunctionFactory.kt
@@ -293,7 +293,7 @@ class IrFunctionFactory(private val irBuiltIns: IrBuiltIns, private val symbolTa
         }
     }
 
-    private fun IrClass.createMembers(isK: Boolean, isSuspend: Boolean, arity: Int, name: String, descriptorFactory: FunctionDescriptorFactory) {
+    private fun IrClass.createMembers(isK: Boolean, isSuspend: Boolean, descriptorFactory: FunctionDescriptorFactory) {
         if (!isK) {
             val invokeSymbol = descriptorFactory.memberDescriptor("invoke") {
                 val returnType = with(IrSimpleTypeBuilder()) {
@@ -461,7 +461,7 @@ class IrFunctionFactory(private val irBuiltIns: IrBuiltIns, private val symbolTa
         klass.parent = packageFragment
         packageFragment.declarations += klass
 
-        klass.createMembers(isK, isSuspend, n, klass.name.identifier, descriptorFactory)
+        klass.createMembers(isK, isSuspend, descriptorFactory)
 
         return klass
     }
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DumpIrTree.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DumpIrTree.kt
index b26cb78b63c..5216430cbff 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DumpIrTree.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DumpIrTree.kt
@@ -216,7 +216,7 @@ class DumpIrTreeVisitor(
     }
 
     private fun IrMemberAccessExpression<*>.getTypeParameterNames(expectedCount: Int): List<String> =
-        if (this is IrDeclarationReference && symbol.isBound)
+        if (symbol.isBound)
             symbol.owner.getTypeParameterNames(expectedCount)
         else
             getPlaceholderParameterNames(expectedCount)
diff --git a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/SymbolTable.kt b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/SymbolTable.kt
index ebe6be25bf5..fc2f361fd58 100644
--- a/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/SymbolTable.kt
+++ b/compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/SymbolTable.kt
@@ -206,7 +206,9 @@ class SymbolTable(
                 }
             } else {
                 if (d.isBound()) {
-                    ((d.owner as? IrSymbolDeclaration<*>)?.symbol ?: descriptorToSymbol[d]) as S?
+                    val result = (d.owner as? IrSymbolDeclaration<*>)?.symbol ?: descriptorToSymbol[d]
+                    @Suppress("UNCHECKED_CAST")
+                    result as S?
                 } else {
                     descriptorToSymbol[d]
                 }
diff --git a/compiler/ir/serialization.common/build.gradle.kts b/compiler/ir/serialization.common/build.gradle.kts
index 5abbf6c1c83..382efb587cd 100644
--- a/compiler/ir/serialization.common/build.gradle.kts
+++ b/compiler/ir/serialization.common/build.gradle.kts
@@ -11,13 +11,12 @@ dependencies {
     compile(project(":compiler:serialization"))
     compile(project(":kotlin-util-klib"))
     compile(project(":kotlin-util-klib-metadata"))
-
     compile(project(":compiler:util"))
     compile(project(":compiler:ir.psi2ir"))
     compile(project(":compiler:ir.backend.common"))
+    compileOnly(project(":kotlin-reflect-api"))
 
     compileOnly(intellijCoreDep()) { includeJars("intellij-core") }
-
 }
 
 sourceSets {
@@ -29,7 +28,7 @@ tasks {
     val compileKotlin by existing(org.jetbrains.kotlin.gradle.tasks.KotlinCompile::class) {
         kotlinOptions {
             freeCompilerArgs += "-Xopt-in=org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI"
+            freeCompilerArgs += "-Xinline-classes"
         }
     }
 }
-
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrOverridingUtil.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrOverridingUtil.kt
index 6ddce727b01..bab60067057 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrOverridingUtil.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrOverridingUtil.kt
@@ -100,6 +100,7 @@ class IrOverridingUtil(
     fun buildFakeOverridesForClass(clazz: IrClass) {
         val superTypes = allPublicApiSuperTypesOrAny(clazz)
 
+        @Suppress("UNCHECKED_CAST")
         val fromCurrent = clazz.declarations.filter { it is IrOverridableMember && it.symbol.isPublicApi } as List<IrOverridableMember>
 
         val allFromSuper = superTypes.flatMap { superType ->
@@ -190,10 +191,7 @@ class IrOverridingUtil(
         }
     }
 
-    private fun filterVisibleFakeOverrides(
-        current: IrClass,
-        toFilter: Collection<IrOverridableMember>
-    ): Collection<IrOverridableMember> {
+    private fun filterVisibleFakeOverrides(toFilter: Collection<IrOverridableMember>): Collection<IrOverridableMember> {
         return toFilter.filter { member: IrOverridableMember ->
             !Visibilities.isPrivate(member.visibility)
         }
@@ -296,7 +294,7 @@ class IrOverridingUtil(
         overridables: Collection<IrOverridableMember>,
         current: IrClass
     ) {
-        val effectiveOverridden = filterVisibleFakeOverrides(current, overridables)
+        val effectiveOverridden = filterVisibleFakeOverrides(overridables)
 
         // The descriptor based algorithm goes further building invisible fakes here,
         // but we don't use invisible fakes in IR
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrVisibilityUtil.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrVisibilityUtil.kt
index 69ff50e52c5..f5a9757687e 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrVisibilityUtil.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/overrides/IrVisibilityUtil.kt
@@ -1,18 +1,19 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
 package org.jetbrains.kotlin.backend.common.overrides
 
-import org.jetbrains.kotlin.backend.common.lower.parents
 import org.jetbrains.kotlin.descriptors.Visibilities
-import org.jetbrains.kotlin.ir.declarations.IrDeclaration
 import org.jetbrains.kotlin.ir.declarations.IrDeclarationWithVisibility
 import org.jetbrains.kotlin.ir.declarations.IrOverridableMember
-import org.jetbrains.kotlin.ir.util.module
-import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValue
 
 // The contents of this file is from VisibilityUtil.kt adapted to IR.
 // TODO: The code would better be commonized for descriptors, ir and fir.
 
 fun isVisibleForOverride(
-    overriding: IrOverridableMember,
+    @Suppress("UNUSED_PARAMETER") overriding: IrOverridableMember,
     fromSuper: IrOverridableMember
 ): Boolean {
     return !Visibilities.isPrivate((fromSuper as IrDeclarationWithVisibility).visibility)
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/CityHash.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/CityHash.kt
index b5362f13580..5e968b9ac63 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/CityHash.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/CityHash.kt
@@ -4,6 +4,7 @@
  */
 
 @file:OptIn(ExperimentalUnsignedTypes::class)
+@file:Suppress("NAME_SHADOWING")
 
 package org.jetbrains.kotlin.backend.common.serialization
 
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/ExpectActualTable.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/ExpectActualTable.kt
index 644f8c3690b..7b9fd41d089 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/ExpectActualTable.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/ExpectActualTable.kt
@@ -106,9 +106,9 @@ class ExpectActualTable(val expectDescriptorToSymbol: MutableMap<DeclarationDesc
         }
 
         val expects: List<MemberDescriptor> = if (descriptor is ClassConstructorDescriptor && descriptor.isPrimary) {
-            (descriptor.containingDeclaration.findExpects() as List<ClassDescriptor>).map {
-                it.unsubstitutedPrimaryConstructor
-            }.filterNotNull()
+            descriptor.containingDeclaration.findExpects().mapNotNull {
+                (it as ClassDescriptor).unsubstitutedPrimaryConstructor
+            }
         } else {
             descriptor.findExpects()
         }
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFileDeserializer.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFileDeserializer.kt
index d11ab6ae8fb..100a0e38ce2 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFileDeserializer.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFileDeserializer.kt
@@ -435,7 +435,6 @@ abstract class IrFileDeserializer(
         proto: ProtoEnumConstructorCall,
         start: Int,
         end: Int,
-        type: IrType
     ): IrEnumConstructorCall {
         val symbol = deserializeIrSymbolAndRemap(proto.symbol) as IrConstructorSymbol
         val call = IrEnumConstructorCallImpl(
@@ -587,7 +586,7 @@ abstract class IrFileDeserializer(
         return callable
     }
 
-    private fun deserializeReturn(proto: ProtoReturn, start: Int, end: Int, type: IrType): IrReturn {
+    private fun deserializeReturn(proto: ProtoReturn, start: Int, end: Int): IrReturn {
         val symbol = deserializeIrSymbolAndRemap(proto.returnTarget) as IrReturnTargetSymbol
         val value = deserializeExpression(proto.value)
         return IrReturnImpl(start, end, builtIns.nothingType, symbol, value)
@@ -631,7 +630,7 @@ abstract class IrFileDeserializer(
         return IrStringConcatenationImpl(start, end, type, arguments)
     }
 
-    private fun deserializeThrow(proto: ProtoThrow, start: Int, end: Int, type: IrType): IrThrowImpl {
+    private fun deserializeThrow(proto: ProtoThrow, start: Int, end: Int): IrThrowImpl {
         return IrThrowImpl(start, end, builtIns.nothingType, deserializeExpression(proto.value))
     }
 
@@ -868,7 +867,7 @@ abstract class IrFileDeserializer(
             CONTINUE -> deserializeContinue(proto.`continue`, start, end, type)
             DELEGATING_CONSTRUCTOR_CALL -> deserializeDelegatingConstructorCall(proto.delegatingConstructorCall, start, end)
             DO_WHILE -> deserializeDoWhile(proto.doWhile, start, end, type)
-            ENUM_CONSTRUCTOR_CALL -> deserializeEnumConstructorCall(proto.enumConstructorCall, start, end, type)
+            ENUM_CONSTRUCTOR_CALL -> deserializeEnumConstructorCall(proto.enumConstructorCall, start, end)
             FUNCTION_REFERENCE -> deserializeFunctionReference(proto.functionReference, start, end, type)
             GET_ENUM_VALUE -> deserializeGetEnumValue(proto.getEnumValue, start, end, type)
             GET_CLASS -> deserializeGetClass(proto.getClass, start, end, type)
@@ -878,11 +877,11 @@ abstract class IrFileDeserializer(
             LOCAL_DELEGATED_PROPERTY_REFERENCE -> deserializeIrLocalDelegatedPropertyReference(proto.localDelegatedPropertyReference, start, end, type)
             INSTANCE_INITIALIZER_CALL -> deserializeInstanceInitializerCall(proto.instanceInitializerCall, start, end)
             PROPERTY_REFERENCE -> deserializePropertyReference(proto.propertyReference, start, end, type)
-            RETURN -> deserializeReturn(proto.`return`, start, end, type)
+            RETURN -> deserializeReturn(proto.`return`, start, end)
             SET_FIELD -> deserializeSetField(proto.setField, start, end)
             SET_VARIABLE -> deserializeSetVariable(proto.setVariable, start, end)
             STRING_CONCAT -> deserializeStringConcat(proto.stringConcat, start, end, type)
-            THROW -> deserializeThrow(proto.`throw`, start, end, type)
+            THROW -> deserializeThrow(proto.`throw`, start, end)
             TRY -> deserializeTry(proto.`try`, start, end, type)
             TYPE_OP -> deserializeTypeOp(proto.typeOp, start, end, type)
             VARARG -> deserializeVararg(proto.vararg, start, end, type)
diff --git a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/metadata/KlibMetadataSerializer.kt b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/metadata/KlibMetadataSerializer.kt
index 56f6e50fd26..b67c21f1b7a 100644
--- a/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/metadata/KlibMetadataSerializer.kt
+++ b/compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/metadata/KlibMetadataSerializer.kt
@@ -145,12 +145,12 @@ abstract class KlibMetadataSerializer(
 
     protected fun serializeDescriptors(
         fqName: FqName,
-        classifierDescriptors: List<DeclarationDescriptor>,
-        topLevelDescriptors: List<DeclarationDescriptor>
+        allClassifierDescriptors: List<DeclarationDescriptor>,
+        allTopLevelDescriptors: List<DeclarationDescriptor>
     ): List<ProtoBuf.PackageFragment> {
 
-        val classifierDescriptors = classifierDescriptors.filterOutExpects()
-        val topLevelDescriptors = topLevelDescriptors.filterOutExpects()
+        val classifierDescriptors = allClassifierDescriptors.filterOutExpects()
+        val topLevelDescriptors = allTopLevelDescriptors.filterOutExpects()
 
         if (TOP_LEVEL_CLASS_DECLARATION_COUNT_PER_FILE == null &&
             TOP_LEVEL_DECLARATION_COUNT_PER_FILE == null) {
diff --git a/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/klib.kt b/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/klib.kt
index 911b9be1d69..6bb42a09432 100644
--- a/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/klib.kt
+++ b/compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/klib.kt
@@ -158,7 +158,7 @@ fun generateKLib(
         deserializeFakeOverrides
     )
 
-    val deserializedModuleFragments = sortDependencies(allDependencies.getFullList(), depsDescriptors.descriptors).map {
+    sortDependencies(allDependencies.getFullList(), depsDescriptors.descriptors).map {
         irLinker.deserializeOnlyHeaderModule(depsDescriptors.getModuleDescriptor(it), it)
     }
 
diff --git a/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryLayoutImpl.kt b/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryLayoutImpl.kt
index 16fec7caef1..976b7c6ebcb 100644
--- a/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryLayoutImpl.kt
+++ b/compiler/util-klib/src/org/jetbrains/kotlin/library/impl/KotlinLibraryLayoutImpl.kt
@@ -52,6 +52,7 @@ class IrLibraryLayoutImpl(klib: File, component: String) : KotlinLibraryLayoutIm
         FromZipIrLibraryImpl(this, zipFileSystem)
 }
 
+@Suppress("UNCHECKED_CAST")
 open class BaseLibraryAccess<L : KotlinLibraryLayout>(val klib: File, component: String?) {
     open val layout = KotlinLibraryLayoutImpl(klib, component)
 
diff --git a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/AndroidLayoutXmlFileManager.kt b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/AndroidLayoutXmlFileManager.kt
index b9865fb42fd..0db69967a4f 100644
--- a/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/AndroidLayoutXmlFileManager.kt
+++ b/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/AndroidLayoutXmlFileManager.kt
@@ -17,7 +17,6 @@
 package org.jetbrains.kotlin.android.synthetic.res
 
 import com.intellij.openapi.module.Module
-import com.intellij.openapi.module.ModuleServiceManager
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.openapi.vfs.VirtualFileManager
@@ -145,7 +144,8 @@ abstract class AndroidLayoutXmlFileManager(val project: Project) {
 
     companion object {
         fun getInstance(module: Module): AndroidLayoutXmlFileManager? {
-            val service = ModuleServiceManager.getService(module, AndroidLayoutXmlFileManager::class.java)
+            @Suppress("DEPRECATION")
+            val service = com.intellij.openapi.module.ModuleServiceManager.getService(module, AndroidLayoutXmlFileManager::class.java)
             return service ?: module.getComponent(AndroidLayoutXmlFileManager::class.java)
         }
     }
diff --git a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/GeneratorHelpers.kt b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/GeneratorHelpers.kt
index 5fe4acea9d1..0f36012c16d 100644
--- a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/GeneratorHelpers.kt
+++ b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/GeneratorHelpers.kt
@@ -90,7 +90,7 @@ interface IrBuilderExtension {
         irInvoke(
             dispatchReceiver,
             callee,
-            args = *valueArguments.toTypedArray(),
+            args = valueArguments.toTypedArray(),
             typeHint = returnTypeHint
         ).also { call -> typeArguments.forEachIndexed(call::putTypeArgument) }
 
@@ -500,11 +500,10 @@ interface IrBuilderExtension {
             property.type,
             genericIndex = property.genericIndex
         )
-            ?.let { expr -> wrapWithNullableSerializerIfNeeded(property.module, property.type, expr, nullableSerClass) }
+            ?.let { expr -> wrapWithNullableSerializerIfNeeded(property.type, expr, nullableSerClass) }
     }
 
     private fun IrBuilderWithScope.wrapWithNullableSerializerIfNeeded(
-        module: ModuleDescriptor,
         type: KotlinType,
         expression: IrExpression,
         nullableSerializerClass: IrClassSymbol
@@ -582,7 +581,7 @@ interface IrBuilderExtension {
                 type.genericIndex,
                 genericGetter
             ) ?: return null
-            return wrapWithNullableSerializerIfNeeded(module, type, expr, nullableSerClass)
+            return wrapWithNullableSerializerIfNeeded(type, expr, nullableSerClass)
         }
 
         var serializerClass = serializerClassOriginal
@@ -661,7 +660,7 @@ interface IrBuilderExtension {
                                         (genericType.constructor.declarationDescriptor as TypeParameterDescriptor).representativeUpperBound
                                     )!!
                                 }!!
-                                wrapWithNullableSerializerIfNeeded(module, type, expr, nullableSerClass)
+                                wrapWithNullableSerializerIfNeeded(type, expr, nullableSerClass)
                             }
                         )
                     )
diff --git a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializableCompanionJsTranslator.kt b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializableCompanionJsTranslator.kt
index 450e9f9a8ef..9f2dcb78123 100644
--- a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializableCompanionJsTranslator.kt
+++ b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializableCompanionJsTranslator.kt
@@ -22,7 +22,6 @@ import org.jetbrains.kotlin.js.backend.ast.JsNameRef
 import org.jetbrains.kotlin.js.backend.ast.JsReturn
 import org.jetbrains.kotlin.js.translate.context.TranslationContext
 import org.jetbrains.kotlin.js.translate.declaration.DeclarationBodyVisitor
-import org.jetbrains.kotlin.psi.KtPureClassOrObject
 import org.jetbrains.kotlin.resolve.descriptorUtil.module
 import org.jetbrains.kotlinx.serialization.compiler.backend.common.SerializableCompanionCodegen
 import org.jetbrains.kotlinx.serialization.compiler.backend.common.findTypeSerializer
@@ -62,7 +61,7 @@ class SerializableCompanionJsTranslator(
     }
 
     companion object {
-        fun translate(declaration: KtPureClassOrObject, descriptor: ClassDescriptor, translator: DeclarationBodyVisitor, context: TranslationContext) {
+        fun translate(descriptor: ClassDescriptor, translator: DeclarationBodyVisitor, context: TranslationContext) {
             val serializableClass = getSerializableClassDescriptorByCompanion(descriptor) ?: return
             if (serializableClass.shouldHaveGeneratedMethodsInCompanion)
                 SerializableCompanionJsTranslator(descriptor, translator, context).generate()
diff --git a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializableJsTranslator.kt b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializableJsTranslator.kt
index 0b0f269933d..e0726e7a51d 100644
--- a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializableJsTranslator.kt
+++ b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializableJsTranslator.kt
@@ -26,7 +26,6 @@ import org.jetbrains.kotlin.js.backend.ast.*
 import org.jetbrains.kotlin.js.resolve.diagnostics.findPsi
 import org.jetbrains.kotlin.js.translate.context.Namer
 import org.jetbrains.kotlin.js.translate.context.TranslationContext
-import org.jetbrains.kotlin.js.translate.declaration.DeclarationBodyVisitor
 import org.jetbrains.kotlin.js.translate.general.Translation
 import org.jetbrains.kotlin.js.translate.utils.JsAstUtils
 import org.jetbrains.kotlin.js.translate.utils.TranslationUtils
@@ -160,7 +159,6 @@ class SerializableJsTranslator(
         fun translate(
             declaration: KtPureClassOrObject,
             serializableClass: ClassDescriptor,
-            translator: DeclarationBodyVisitor,
             context: TranslationContext
         ) {
             if (serializableClass.isInternalSerializable)
diff --git a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializerJsTranslator.kt b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializerJsTranslator.kt
index 4d4b28231ff..d056deb019f 100644
--- a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializerJsTranslator.kt
+++ b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/backend/js/SerializerJsTranslator.kt
@@ -23,7 +23,6 @@ import org.jetbrains.kotlin.js.translate.utils.TranslationUtils
 import org.jetbrains.kotlin.psi.KtExpression
 import org.jetbrains.kotlin.psi.KtPureClassOrObject
 import org.jetbrains.kotlin.resolve.descriptorUtil.getSuperClassNotAny
-import org.jetbrains.kotlin.types.typeUtil.builtIns
 import org.jetbrains.kotlinx.serialization.compiler.backend.common.SerializerCodegen
 import org.jetbrains.kotlinx.serialization.compiler.backend.common.getSerialTypeInfo
 import org.jetbrains.kotlinx.serialization.compiler.resolve.*
@@ -362,7 +361,6 @@ open class SerializerJsTranslator(
 
     companion object {
         fun translate(
-            declaration: KtPureClassOrObject,
             descriptor: ClassDescriptor,
             translator: DeclarationBodyVisitor,
             context: TranslationContext
diff --git a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/extensions/SerializationJsExtension.kt b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/extensions/SerializationJsExtension.kt
index 445ee49cd31..c73e5e8f763 100644
--- a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/extensions/SerializationJsExtension.kt
+++ b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/extensions/SerializationJsExtension.kt
@@ -27,8 +27,8 @@ import org.jetbrains.kotlinx.serialization.compiler.backend.js.SerializerJsTrans
 
 open class SerializationJsExtension: JsSyntheticTranslateExtension {
     override fun generateClassSyntheticParts(declaration: KtPureClassOrObject, descriptor: ClassDescriptor, translator: DeclarationBodyVisitor, context: TranslationContext) {
-        SerializerJsTranslator.translate(declaration, descriptor, translator, context)
-        SerializableJsTranslator.translate(declaration, descriptor, translator, context)
-        SerializableCompanionJsTranslator.translate(declaration, descriptor, translator, context)
+        SerializerJsTranslator.translate(descriptor, translator, context)
+        SerializableJsTranslator.translate(declaration, descriptor, context)
+        SerializableCompanionJsTranslator.translate(descriptor, translator, context)
     }
 }
\ No newline at end of file