diff --git a/libraries/scripting/js-test/build.gradle.kts b/libraries/scripting/js-test/build.gradle.kts
new file mode 100644
index 00000000000..1f536ed2b9c
--- /dev/null
+++ b/libraries/scripting/js-test/build.gradle.kts
@@ -0,0 +1,32 @@
+
+plugins {
+    kotlin("jvm")
+}
+
+jvmTarget = "1.6"
+
+val embeddableTestRuntime by configurations.creating
+
+dependencies {
+    testCompile(commonDep("junit"))
+
+    testCompile(project(":kotlin-scripting-js"))
+    testCompile(project(":compiler:plugin-api"))
+    testCompile(project(":kotlin-scripting-compiler"))
+    testCompile(project(":compiler:cli"))
+    testCompile(project(":compiler:backend.js"))
+    testCompile(project(":js:js.engines"))
+    testCompile(intellijCoreDep()) { includeJars("intellij-core") }
+    testRuntimeOnly(intellijCoreDep()) { includeJars("intellij-core") }
+    testRuntimeOnly(intellijDep()) { includeJars("openapi", "idea", "idea_rt", "log4j", "picocontainer-1.2", "guava-25.1-jre", "jdom") }
+    testRuntimeOnly(commonDep("org.jetbrains.intellij.deps", "trove4j"))
+}
+
+sourceSets {
+    "main" {}
+    "test" { projectDefault() }
+}
+
+projectTest(parallel = true) {
+    workingDir = rootDir
+}
diff --git a/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/AbstractJsReplTest.kt b/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/AbstractJsReplTest.kt
new file mode 100644
index 00000000000..bced0deb78e
--- /dev/null
+++ b/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/AbstractJsReplTest.kt
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2010-2019 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.scripting.repl.js.test
+
+import com.intellij.openapi.util.Disposer
+import org.jetbrains.kotlin.cli.common.CLIConfigurationKeys
+import org.jetbrains.kotlin.cli.common.messages.MessageCollector
+import org.jetbrains.kotlin.cli.common.repl.ReplCodeLine
+import org.jetbrains.kotlin.cli.common.repl.ReplCompileResult
+import org.jetbrains.kotlin.cli.common.repl.ReplCompiler
+import org.jetbrains.kotlin.cli.common.repl.ReplEvalResult
+import org.jetbrains.kotlin.cli.jvm.compiler.EnvironmentConfigFiles
+import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
+import org.jetbrains.kotlin.compiler.plugin.ComponentRegistrar
+import org.jetbrains.kotlin.config.CommonConfigurationKeys
+import org.jetbrains.kotlin.config.CompilerConfiguration
+import org.jetbrains.kotlin.scripting.compiler.plugin.ScriptingCompilerConfigurationComponentRegistrar
+import org.jetbrains.kotlin.scripting.configuration.ScriptingConfigurationKeys
+import org.jetbrains.kotlin.scripting.definitions.ScriptDefinition
+import org.jetbrains.kotlin.scripting.definitions.platform
+import org.jetbrains.kotlin.scripting.repl.js.JsReplEvaluator
+import org.jetbrains.kotlin.scripting.repl.js.ReplMessageCollector
+import java.io.Closeable
+import kotlin.script.experimental.api.ScriptCompilationConfiguration
+import kotlin.script.experimental.api.baseClass
+import kotlin.script.experimental.api.dependencies
+import kotlin.script.experimental.host.ScriptingHostConfiguration
+import kotlin.script.experimental.jvm.JsDependency
+
+abstract class AbstractJsReplTest : Closeable {
+    abstract fun createCompiler(): ReplCompiler
+    abstract fun preprocessEvaluation()
+
+    fun compile(codeLine: ReplCodeLine): ReplCompileResult {
+        return compiler.compile(compiler.createState(), codeLine)
+    }
+
+    fun evaluate(compileResult: ReplCompileResult.CompiledClasses): ReplEvalResult {
+        return jsEvaluator.eval(jsEvaluator.createState(), compileResult)
+    }
+
+    fun reset() {
+        collector.clear()
+        compiler = createCompiler()
+        jsEvaluator = JsReplEvaluator()
+        preprocessEvaluation()
+    }
+
+    private val collector: MessageCollector = ReplMessageCollector()
+    protected val disposable = Disposer.newDisposable()
+    protected val environment = KotlinCoreEnvironment.createForProduction(
+        disposable, loadConfiguration(), EnvironmentConfigFiles.JS_CONFIG_FILES
+    )
+
+    lateinit var compiler: ReplCompiler
+    lateinit var jsEvaluator: JsReplEvaluator
+
+    private var snippetId: Int = 1 //index 0 for klib
+    fun newSnippetId(): Int = snippetId++
+
+    private fun loadConfiguration(): CompilerConfiguration {
+        val configuration = CompilerConfiguration()
+        configuration.add(ComponentRegistrar.PLUGIN_COMPONENT_REGISTRARS, ScriptingCompilerConfigurationComponentRegistrar())
+        configuration.put(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY, collector)
+        configuration.put(CommonConfigurationKeys.MODULE_NAME, "repl.kts")
+        val scriptConfiguration = ScriptCompilationConfiguration {
+            baseClass("kotlin.Any")
+            dependencies.append(JsDependency("compiler/ir/serialization.js/build/fullRuntime/klib"))
+            platform.put("JS")
+        }
+        configuration.add(
+            ScriptingConfigurationKeys.SCRIPT_DEFINITIONS,
+            ScriptDefinition.FromConfigurations(ScriptingHostConfiguration(), scriptConfiguration, null)
+        )
+        return configuration
+    }
+}
diff --git a/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/JsReplTestAgainstBinaries.kt b/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/JsReplTestAgainstBinaries.kt
new file mode 100644
index 00000000000..ed562e45de5
--- /dev/null
+++ b/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/JsReplTestAgainstBinaries.kt
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2019 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.scripting.repl.js.test
+
+import org.jetbrains.kotlin.cli.common.repl.ReplCompiler
+import org.jetbrains.kotlin.ir.backend.js.utils.NameTables
+import org.jetbrains.kotlin.scripting.repl.js.*
+
+class JsReplTestAgainstBinaries : AbstractJsReplTest() {
+    private val dependencyLoader = DependencyLoader()
+
+    private val runtimeBinary: String
+    private val nameTable: NameTables
+
+    init {
+        val dependencies = readLibrariesFromConfiguration(environment.configuration)
+        val compiler = ScriptDependencyCompiler(environment)
+
+        val result = compiler.compile(dependencies)
+        runtimeBinary = result.first
+        nameTable = result.second
+
+        dependencyLoader.saveScriptDependencyBinary(runtimeBinary)
+        dependencyLoader.saveNames(nameTable)
+    }
+
+    override fun createCompiler(): ReplCompiler {
+        return JsDebuggerCompiler(environment, dependencyLoader.loadNames())
+    }
+
+    override fun preprocessEvaluation() {
+        jsEvaluator.eval(
+            jsEvaluator.createState(),
+            createCompileResult(dependencyLoader.loadScriptDependencyBinary())
+        )
+    }
+
+    override fun close() {
+        //do nothing
+    }
+}
diff --git a/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/JsReplTestAgainstKlib.kt b/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/JsReplTestAgainstKlib.kt
new file mode 100644
index 00000000000..e2f51b0d68e
--- /dev/null
+++ b/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/JsReplTestAgainstKlib.kt
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2010-2019 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.scripting.repl.js.test
+
+import com.intellij.openapi.util.Disposer
+import org.jetbrains.kotlin.cli.common.repl.ReplCompiler
+import org.jetbrains.kotlin.scripting.repl.js.*
+
+class JsReplTestAgainstKlib : AbstractJsReplTest() {
+    override fun createCompiler(): ReplCompiler = JsReplCompiler(environment)
+
+    override fun preprocessEvaluation() {
+        val scriptDependencyBinary = (compiler as JsReplCompiler).scriptDependencyBinary
+
+        jsEvaluator.eval(
+            jsEvaluator.createState(),
+            createCompileResult(scriptDependencyBinary)
+        )
+    }
+
+    override fun close() {
+        Disposer.dispose(disposable)
+    }
+}
diff --git a/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/ReplTest.kt b/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/ReplTest.kt
new file mode 100644
index 00000000000..d523de80c17
--- /dev/null
+++ b/libraries/scripting/js-test/test/org/jetbrains/kotlin/scripting/repl/js/test/ReplTest.kt
@@ -0,0 +1,243 @@
+/*
+ * Copyright 2010-2019 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.scripting.repl.js.test
+
+import junit.framework.TestCase
+import org.jetbrains.kotlin.cli.common.repl.ReplCompileResult
+import org.junit.Assert
+import org.junit.Test
+import org.jetbrains.kotlin.cli.common.repl.ReplEvalResult
+import org.jetbrains.kotlin.scripting.repl.js.makeReplCodeLine
+
+abstract class AbstractReplTestRunner : TestCase() {
+    abstract fun getTester(): AbstractJsReplTest
+
+    @Test
+    fun testIndependentLines() {
+        val lines = listOf(
+            "var x = 38",
+            "var y = 99",
+            "4 + 1"
+        )
+        Assert.assertEquals(5, compileAndEval(lines))
+    }
+
+    @Test
+    fun testDependentLines() {
+        val lines = listOf(
+            "var x = 7",
+            "var y = 32",
+            "x + y"
+        )
+        Assert.assertEquals(39, compileAndEval(lines))
+    }
+
+    @Test
+    fun testFunctionCall() {
+        val lines = listOf(
+            "var x = 2",
+            "var y = 3",
+            "fun foo(x: Int, unused: Int) = x + y",
+            "foo(x, x) * foo(y, y)"
+        )
+        Assert.assertEquals(30, compileAndEval(lines))
+    }
+
+    @Test
+    fun testList() {
+        val lines = listOf(
+            "var a = 4",
+            "var b = 6",
+            "listOf(a, 5, b).last()"
+        )
+        Assert.assertEquals(6, compileAndEval(lines))
+    }
+
+    @Test
+    fun testMatchingNames() {
+        val lines = listOf(
+            "fun foo(i: Int) = i + 2",
+            "fun foo(s: String) = s",
+            "class C {fun foo(s: String) = s + s}",
+            "foo(\"x\") + foo(2) + C().foo(\"class\")"
+        )
+        Assert.assertEquals("x4classclass", compileAndEval(lines))
+    }
+
+    @Test
+    fun testInline() {
+        val lines = listOf(
+            "inline fun foo(i : Int) = if (i % 2 == 0) {} else i",
+            """
+            fun box(): String {
+                val a = foo(1)
+                if (a != 1) return "fail1: ${'$'}a"
+
+                val b = foo(2)
+                if (b != Unit) return "fail2: ${'$'}b"
+
+                return "OK"
+            },
+            box()
+            """
+        )
+        Assert.assertEquals("OK", compileAndEval(lines))
+    }
+
+    @Test
+    fun testAnonymous() {
+        val lines = listOf(
+            """
+            inline fun foo(f: () -> String): () -> String {
+                val result = f()
+                return { result }
+            }
+            """,
+            "fun bar(f: () -> String) = foo(f)()",
+            "fun box(): String = bar { \"OK\" }",
+            "box()"
+        )
+        Assert.assertEquals("OK", compileAndEval(lines))
+    }
+
+    @Test
+    fun testNoneLocalReturn() {
+        val lines = listOf(
+            """
+            inline fun f(ignored: () -> Any): Any {
+                return ignored()
+            }
+            """,
+            """
+            fun test(): String {
+                f { return "OK" };
+                return "error"
+            }
+            """,
+            "test()"
+        )
+        Assert.assertEquals("OK", compileAndEval(lines))
+    }
+
+    @Test
+    fun testInstanceOf() {
+        val lines = listOf(
+            """
+            val list = listOf(1, 2, 3)
+            val f: Boolean = list is List<Int>
+            """,
+            "val s = list is List<Int>",
+            "f.toString() + s.toString()"
+        )
+        Assert.assertEquals("truetrue", compileAndEval(lines))
+    }
+
+    @Test
+    fun testScopes() {
+        val lines = listOf(
+            """
+            fun foo(): Int {
+                var t = 2 * 2
+                class A(val value: Int = 5) {
+                    fun bar(): Int {
+                        var q = 4
+                        var w = 1
+                        return q + w
+                    }
+                }
+
+                return A().bar() * 2
+            }
+            foo()
+            """
+        )
+        Assert.assertEquals(10, compileAndEval(lines))
+    }
+
+    @Test
+    fun testEvaluateFunctionName() {
+        val lines = listOf(
+            "fun evaluateScript() = 5",
+            "fun foo(i: Int) = i + evaluateScript()",
+            "foo(5)"
+        )
+        Assert.assertEquals(10, compileAndEval(lines))
+    }
+
+    @Test
+    fun testMemberDeclarations() {
+        val lines = listOf(
+            """
+            val a = listOf(1, 2, 3, 4, 5)
+            val str = "" + kotlin.math.PI
+            str + a.subList(2, 3).toString() + a.lastIndexOf(4)
+            """
+        )
+        Assert.assertEquals("3.141592653589793[3]3", compileAndEval(lines))
+    }
+
+    @Test
+    fun testInitializeScriptFunction() {
+        val lines = listOf(
+            """
+            var result = ""
+            
+            class Class(val x: Int = 10)
+            result += Class().x
+            
+            fun function() = "#$@"
+            result += function()
+            
+            val field = 123456
+            result += field
+            
+            val sq: (x: Int) -> Int = { x -> x * x }
+            result += "_" + sq(9)
+            
+            result += if (sq(5) % 2 == 0) {
+                class I(val x: Int = 100)
+                I().x 
+            } else {
+                class I(val x: String = "goo")
+                I().x
+            }
+            
+            result
+            """
+        )
+        Assert.assertEquals("10#$@123456_81goo", compileAndEval(lines))
+    }
+
+    private fun compileAndEval(lines: List<String>): Any? {
+        var result: Any? = null
+        getTester().use { tester ->
+            tester.reset()
+
+            lines.forEach { line ->
+                val compileResult = tester.compile(makeReplCodeLine(tester.newSnippetId(), line))
+                if (compileResult !is ReplCompileResult.CompiledClasses) return compileResult.toString()
+
+                val evalResult = tester.evaluate(compileResult)
+                if (evalResult !is ReplEvalResult.ValueResult) return evalResult.toString()
+
+                result = evalResult.value
+            }
+        }
+        return result
+    }
+}
+
+class ReplTestRunnerAgainstKLib : AbstractReplTestRunner() {
+    override fun getTester(): AbstractJsReplTest = JsReplTestAgainstKlib()
+}
+
+class ReplTestRunnerAgainstBinaries : AbstractReplTestRunner() {
+    override fun getTester(): AbstractJsReplTest = tester
+
+    companion object {
+        private val tester = JsReplTestAgainstBinaries()
+    }
+}
diff --git a/plugins/scripting/scripting-compiler-impl/src/org/jetbrains/kotlin/scripting/definitions/ScriptDefinition.kt b/plugins/scripting/scripting-compiler-impl/src/org/jetbrains/kotlin/scripting/definitions/ScriptDefinition.kt
index 6ba3a7651a8..6cc6f29ee39 100644
--- a/plugins/scripting/scripting-compiler-impl/src/org/jetbrains/kotlin/scripting/definitions/ScriptDefinition.kt
+++ b/plugins/scripting/scripting-compiler-impl/src/org/jetbrains/kotlin/scripting/definitions/ScriptDefinition.kt
@@ -149,6 +149,9 @@ abstract class ScriptDefinition : UserDataHolderBase() {
                 ?: hostConfiguration[ScriptingHostConfiguration.jvm.baseClassLoader]
         }
 
+        override val platform: String
+            get() = compilationConfiguration[ScriptCompilationConfiguration.platform] ?: super.platform
+
         override val baseClassType: KotlinType
             get() = compilationConfiguration[ScriptCompilationConfiguration.baseClass]!!