diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinTargetConfigurator.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinTargetConfigurator.kt
index 9c6fae68ab8..8f5fb587f59 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinTargetConfigurator.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinTargetConfigurator.kt
@@ -22,6 +22,7 @@ import org.gradle.api.plugins.ExtensionAware
 import org.gradle.api.plugins.JavaBasePlugin
 import org.gradle.api.tasks.Delete
 import org.gradle.api.tasks.bundling.Jar
+import org.gradle.api.tasks.bundling.Zip
 import org.gradle.language.base.plugins.LifecycleBasePlugin
 import org.gradle.language.jvm.tasks.ProcessResources
 import org.jetbrains.kotlin.gradle.dsl.KotlinCommonOptions
@@ -350,12 +351,14 @@ abstract class KotlinOnlyTargetConfigurator<KotlinCompilationType : KotlinCompil
         }
     }
 
-    /** The implementations are expected to create a [Jar] task under the name [KotlinTarget.artifactsTaskName] of the [target]. */
-    protected open fun createJarTasks(target: KotlinTargetType) {
+    /** The implementations are expected to create a [Zip] task under the name [KotlinTarget.artifactsTaskName] of the [target]. */
+    protected open fun createJarTasks(target: KotlinTargetType): Pair<String, Zip> {
         val result = target.project.tasks.create(target.artifactsTaskName, Jar::class.java)
         result.description = "Assembles a jar archive containing the main classes."
         result.group = BasePlugin.BUILD_GROUP
         result.from(target.compilations.getByName(KotlinCompilation.MAIN_COMPILATION_NAME).output.allOutputs)
+
+        return ArtifactTypeDefinition.JAR_TYPE to result
     }
 
     override fun configureArchivesAndComponent(target: KotlinTargetType) {
@@ -363,17 +366,16 @@ abstract class KotlinOnlyTargetConfigurator<KotlinCompilationType : KotlinCompil
 
         val mainCompilation = target.compilations.getByName(KotlinCompilation.MAIN_COMPILATION_NAME)
 
-        createJarTasks(target)
-        val jar = project.tasks.getByName(target.artifactsTaskName) as Jar
+        val (type, task) = createJarTasks(target)
 
-        target.disambiguationClassifier?.let { jar.appendix = it.toLowerCase() }
+        target.disambiguationClassifier?.let { task.appendix = it.toLowerCase() }
 
         // Workaround: adding the artifact during configuration seems to interfere with the Java plugin, which results into missing
         // task dependency 'assemble -> jar' if the Java plugin is applied after this steps
         project.afterEvaluate {
-            project.artifacts.add(Dependency.ARCHIVES_CONFIGURATION, jar) { jarArtifact ->
-                jarArtifact.builtBy(jar)
-                jarArtifact.type = ArtifactTypeDefinition.JAR_TYPE
+            project.artifacts.add(Dependency.ARCHIVES_CONFIGURATION, task) { jarArtifact ->
+                jarArtifact.builtBy(task)
+                jarArtifact.type = type
 
                 val apiElementsConfiguration = project.configurations.getByName(target.apiElementsConfigurationName)
                 addJar(apiElementsConfiguration, jarArtifact)
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/KotlinJsTargetConfigurator.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/KotlinJsTargetConfigurator.kt
index 7ccbfdbeaff..494d0a6658d 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/KotlinJsTargetConfigurator.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/KotlinJsTargetConfigurator.kt
@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.gradle.targets.js
 
-import org.gradle.api.tasks.bundling.Jar
 import org.gradle.language.base.plugins.LifecycleBasePlugin
 import org.jetbrains.kotlin.gradle.dsl.kotlinExtension
 import org.jetbrains.kotlin.gradle.plugin.Kotlin2JsSourceSetProcessor
@@ -13,7 +12,6 @@ import org.jetbrains.kotlin.gradle.plugin.KotlinOnlyTargetConfigurator
 import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSetProcessor
 import org.jetbrains.kotlin.gradle.plugin.KotlinTargetWithTestsConfigurator
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinJsCompilation
-import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinOnlyTarget
 import org.jetbrains.kotlin.gradle.plugin.mpp.defaultSourceSetName
 import org.jetbrains.kotlin.gradle.targets.js.ir.KotlinJsIrTargetConfigurator
 import org.jetbrains.kotlin.gradle.tasks.KotlinTasksProvider
@@ -92,15 +90,6 @@ open class KotlinJsTargetConfigurator(kotlinPluginVersion: String, val irConfigu
         }
     }
 
-    override fun createJarTasks(target: KotlinOnlyTarget<KotlinJsCompilation>) {
-        super.createJarTasks(target)
-        val jar = target.project.tasks.getByName(target.artifactsTaskName) as Jar
-
-        if (irConfigurator != null) {
-            jar.archiveAppendix.set("legacyJs")
-        }
-    }
-
     override fun configureCompilations(target: KotlinJsTarget) {
         super.configureCompilations(target)
 
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KlibType.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KlibType.kt
new file mode 100644
index 00000000000..b0ca01cbbbf
--- /dev/null
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KlibType.kt
@@ -0,0 +1,8 @@
+/*
+ * 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.gradle.targets.js.ir
+
+const val KLIB_TYPE = "klib"
\ No newline at end of file
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrTargetConfigurator.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrTargetConfigurator.kt
index 65a7952ccda..43bbacbffba 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrTargetConfigurator.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrTargetConfigurator.kt
@@ -5,11 +5,13 @@
 
 package org.jetbrains.kotlin.gradle.targets.js.ir
 
+import org.gradle.api.tasks.bundling.Zip
 import org.jetbrains.kotlin.gradle.dsl.KotlinJsOptions
 import org.jetbrains.kotlin.gradle.plugin.KotlinJsIrSourceSetProcessor
 import org.jetbrains.kotlin.gradle.plugin.KotlinOnlyTargetConfigurator
 import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSetProcessor
 import org.jetbrains.kotlin.gradle.plugin.KotlinTargetWithTestsConfigurator
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinOnlyTarget
 import org.jetbrains.kotlin.gradle.targets.js.KotlinJsIrReportAggregatingTestRun
 import org.jetbrains.kotlin.gradle.tasks.KotlinTasksProvider
 import org.jetbrains.kotlin.gradle.testing.internal.kotlinTestRegistry
@@ -21,11 +23,6 @@ open class KotlinJsIrTargetConfigurator(kotlinPluginVersion: String) :
 
     override val testRunClass: Class<KotlinJsIrReportAggregatingTestRun> get() = KotlinJsIrReportAggregatingTestRun::class.java
 
-    @Deprecated("Remove when legacy js plugin will be removed")
-    fun configureTarget(target: KotlinJsIrTarget, mixedMode: Boolean) {
-        super<KotlinOnlyTargetConfigurator>.configureTarget(target) // TODO Add tests support
-    }
-
     override fun createTestRun(
         name: String,
         target: KotlinJsIrTarget
@@ -54,6 +51,13 @@ open class KotlinJsIrTargetConfigurator(kotlinPluginVersion: String) :
         return KotlinJsIrSourceSetProcessor(compilation.target.project, tasksProvider, compilation, kotlinPluginVersion)
     }
 
+    override fun createJarTasks(target: KotlinOnlyTarget<KotlinJsIrCompilation>): Pair<String, Zip> {
+        val (_, task) = super.createJarTasks(target)
+        task.archiveExtension.set(KLIB_TYPE)
+
+        return KLIB_TYPE to task
+    }
+
     override fun configureCompilations(target: KotlinJsIrTarget) {
         super.configureCompilations(target)
 
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/metadata/KotlinMetadataTargetConfigurator.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/metadata/KotlinMetadataTargetConfigurator.kt
index 044f902a28d..4aa19ea2a2c 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/metadata/KotlinMetadataTargetConfigurator.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/metadata/KotlinMetadataTargetConfigurator.kt
@@ -14,6 +14,7 @@ import org.gradle.api.plugins.BasePlugin
 import org.gradle.api.tasks.AbstractCopyTask
 import org.gradle.api.tasks.TaskProvider
 import org.gradle.api.tasks.bundling.Jar
+import org.gradle.api.tasks.bundling.Zip
 import org.jetbrains.kotlin.gradle.dsl.KotlinCommonOptions
 import org.jetbrains.kotlin.gradle.dsl.kotlinExtension
 import org.jetbrains.kotlin.gradle.dsl.multiplatformExtension
@@ -23,8 +24,8 @@ import org.jetbrains.kotlin.gradle.plugin.sources.*
 import org.jetbrains.kotlin.gradle.plugin.statistics.KotlinBuildStatsService
 import org.jetbrains.kotlin.gradle.tasks.KotlinNativeCompile
 import org.jetbrains.kotlin.gradle.tasks.KotlinTasksProvider
-import org.jetbrains.kotlin.gradle.tasks.registerTask
 import org.jetbrains.kotlin.gradle.tasks.locateTask
+import org.jetbrains.kotlin.gradle.tasks.registerTask
 import org.jetbrains.kotlin.gradle.utils.addExtendsFromRelation
 import org.jetbrains.kotlin.gradle.utils.lowerCamelCaseName
 import org.jetbrains.kotlin.gradle.utils.setArchiveAppendixCompatible
@@ -131,8 +132,8 @@ class KotlinMetadataTargetConfigurator(kotlinPluginVersion: String) :
         override fun run() = Unit
     }
 
-    override fun createJarTasks(target: KotlinMetadataTarget) {
-        super.createJarTasks(target)
+    override fun createJarTasks(target: KotlinMetadataTarget): Pair<String, Zip> {
+        val result = super.createJarTasks(target)
 
         if (target.project.isKotlinGranularMetadataEnabled) {
             target.project.locateTask<Jar>(target.artifactsTaskName)!!.configure {
@@ -157,6 +158,8 @@ class KotlinMetadataTargetConfigurator(kotlinPluginVersion: String) :
                 }
             }
         }
+
+        return result
     }
 
     private fun setupDependencyTransformationForCommonSourceSets(target: KotlinMetadataTarget) {