diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/dsl/KotlinJsTargetDsl.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/dsl/KotlinJsTargetDsl.kt
index 67b401248b8..437c496e549 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/dsl/KotlinJsTargetDsl.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/dsl/KotlinJsTargetDsl.kt
@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.gradle.targets.js.dsl
 
+import groovy.lang.Closure
 import org.jetbrains.kotlin.gradle.targets.js.nodejs.NodeJsExec
 import org.jetbrains.kotlin.gradle.targets.js.testing.KotlinJsTest
 import org.jetbrains.kotlin.gradle.targets.js.webpack.KotlinWebpack
@@ -12,18 +13,49 @@ import org.jetbrains.kotlin.gradle.targets.js.webpack.KotlinWebpack
 interface KotlinJsTargetDsl {
     fun browser() = browser { }
     fun browser(body: KotlinJsBrowserDsl.() -> Unit)
+    fun browser(fn: Closure<*>) {
+        browser {
+            fn.delegate = this
+            fn.call()
+        }
+    }
 
     fun nodejs() = nodejs { }
     fun nodejs(body: KotlinJsNodeDsl.() -> Unit)
+    fun nodejs(fn: Closure<*>) {
+        nodejs {
+            fn.delegate = this
+            fn.call()
+        }
+    }
 }
 
 interface KotlinJsSubTargetDsl {
     fun testTask(body: KotlinJsTest.() -> Unit)
+    fun testTask(fn: Closure<*>) {
+        testTask {
+            fn.delegate = this
+            fn.call()
+        }
+    }
 }
 
 interface KotlinJsBrowserDsl : KotlinJsSubTargetDsl {
     fun runTask(body: KotlinWebpack.() -> Unit)
+    fun runTask(fn: Closure<*>) {
+        runTask {
+            fn.delegate = this
+            fn.call()
+        }
+    }
+
     fun webpackTask(body: KotlinWebpack.() -> Unit)
+    fun webpackTask(fn: Closure<*>) {
+        testTask {
+            fn.delegate = this
+            fn.call()
+        }
+    }
 }
 
 interface KotlinJsNodeDsl : KotlinJsSubTargetDsl {
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/subtargets/KotlinBrowserJs.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/subtargets/KotlinBrowserJs.kt
index 1899a43b4af..0e26d478a89 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/subtargets/KotlinBrowserJs.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/subtargets/KotlinBrowserJs.kt
@@ -25,8 +25,6 @@ class KotlinBrowserJs(target: KotlinJsTarget) :
 
     override fun configureDefaultTestFramework(it: KotlinJsTest) {
         it.useKarma {
-            useMocha()
-            useWebpack()
             useChromeHeadless()
         }
     }
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/KotlinJsTest.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/KotlinJsTest.kt
index 8d717ec792f..26ddb19f883 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/KotlinJsTest.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/KotlinJsTest.kt
@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.gradle.targets.js.testing
 
+import groovy.lang.Closure
 import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.Internal
 import org.gradle.api.tasks.SkipWhenEmpty
@@ -34,10 +35,28 @@ open class KotlinJsTest : KotlinTest(), RequiresNpmDependencies {
         get() = testFramework!!.requiredNpmDependencies
 
     fun useNodeJs(body: KotlinNodeJsTestRunner.() -> Unit) = use(KotlinNodeJsTestRunner(project), body)
+    fun useNodeJs(fn: Closure<*>) {
+        useNodeJs {
+            fn.delegate = this
+            fn.call()
+        }
+    }
 
     fun useMocha(body: KotlinMocha.() -> Unit) = use(KotlinMocha(project), body)
+    fun useMocha(fn: Closure<*>) {
+        useMocha {
+            fn.delegate = this
+            fn.call()
+        }
+    }
 
     fun useKarma(body: KotlinKarma.() -> Unit) = use(KotlinKarma(project), body)
+    fun useKarma(fn: Closure<*>) {
+        useKarma {
+            fn.delegate = this
+            fn.call()
+        }
+    }
 
     private inline fun <T : KotlinJsTestFramework> use(runner: T, body: T.() -> Unit): T {
         check(testFramework == null) {
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt
index 20290383483..38a51780612 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/karma/KotlinKarma.kt
@@ -44,6 +44,8 @@ class KotlinKarma(val project: Project) : KotlinJsTestFramework {
         requiredDependencies.add(versions.karma)
 
         useTeamcityReporter()
+        useMocha()
+        useWebpack()
 
         config.singleRun = true
     }
@@ -78,13 +80,13 @@ class KotlinKarma(val project: Project) : KotlinJsTestFramework {
         requiredDependencies.add(dependency)
     }
 
-    fun useMocha() {
+    private fun useMocha() {
         requiredDependencies.add(versions.karmaMocha)
         requiredDependencies.add(versions.mocha)
         config.frameworks.add("mocha")
     }
 
-    fun useWebpack() {
+    private fun useWebpack() {
         requiredDependencies.add(versions.karmaWebpack)
 
         addPreprocessor("webpack")