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 980f94910aa..5dc81990e78 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
@@ -165,12 +165,13 @@ class KotlinKarma(override val compilation: KotlinJsCompilation) : KotlinJsTestF
             //language=ES6
             it.appendln(
                 """
-                (function() {
+                // noinspection JSUnnecessarySemicolon
+                ;(function(config) {
                     const webpack = require('webpack');
                     config.plugins.push(new webpack.SourceMapDevToolPlugin({
                         moduleFilenameTemplate: "[absolute-resource-path]"
                     }))
-                })();
+                })(config);
             """.trimIndent()
             )
 
@@ -244,16 +245,16 @@ class KotlinKarma(override val compilation: KotlinJsCompilation) : KotlinJsTestF
     private fun createAdapterJs() {
         configurators.add {
             val npmProject = compilation.npmProject
-            val files = it.nodeModulesToLoad.map { npmProject.require(it) }
+            val file = it.nodeModulesToLoad
+                .map { npmProject.require(it) }
+                .single()
 
             val adapterJs = npmProject.dir.resolve("adapter-browser.js")
             adapterJs.printWriter().use { writer ->
                 val karmaRunner = npmProject.require("kotlin-test-js-runner/kotlin-test-karma-runner.js")
                 writer.println("require(${karmaRunner.jsQuoted()})")
 
-                files.forEach { file ->
-                    writer.println("require(${file.jsQuoted()})")
-                }
+                writer.println("module.exports = require(${file.jsQuoted()})")
             }
 
             config.files.add(adapterJs.canonicalPath)
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt
index 777c41e356a..22f0a126ba3 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt
@@ -98,7 +98,7 @@ class KotlinMocha(override val compilation: KotlinJsCompilation) : KotlinJsTestF
             val adapter = npmProject.require("kotlin-test-js-runner/kotlin-test-nodejs-runner.js")
             writer.println("require(${adapter.jsQuoted()})")
 
-            writer.println("require(${file.jsQuoted()})")
+            writer.println("module.exports = require(${file.jsQuoted()})")
         }
     }
 
diff --git a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpackConfig.kt b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpackConfig.kt
index 17b37127c31..d8f010a82c9 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpackConfig.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpackConfig.kt
@@ -227,7 +227,8 @@ data class KotlinWebpackConfig(
         appendln(
             """
                 // Report progress to console
-                (function(config) {
+                // noinspection JSUnnecessarySemicolon
+                ;(function(config) {
                     const webpack = require('webpack');
                     const handler = (percentage, message, ...args) => {
                         let p = percentage * 100;