[JS IR] Support per-file mode and ES modules

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt

@@ -170,6 +170,9 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xir-per-module-output-name", description = "Adds a custom output name to the splitted js files")
     var irPerModuleOutputName: String? by NullableStringFreezableVar(null)
 
+    @Argument(value = "-Xir-per-file", description = "Splits generated .js per-file")
+    var irPerFile: Boolean by FreezableVar(false)
+
     @Argument(
         value = "-Xinclude",
         valueDescription = "<path>",

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JsArgumentConstants.java

@@ -24,6 +24,7 @@ public interface K2JsArgumentConstants {
     String MODULE_AMD = "amd";
     String MODULE_COMMONJS = "commonjs";
     String MODULE_UMD = "umd";
+    String MODULE_ES = "es";
 
     String SOURCE_MAP_SOURCE_CONTENT_ALWAYS = "always";
     String SOURCE_MAP_SOURCE_CONTENT_NEVER = "never";

compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt

@@ -44,6 +44,8 @@ import org.jetbrains.kotlin.ir.backend.js.ic.checkCaches
 import org.jetbrains.kotlin.ir.backend.js.utils.sanitizeName
 import org.jetbrains.kotlin.ir.backend.js.ic.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity
+import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer
 import org.jetbrains.kotlin.ir.declarations.persistent.PersistentIrFactory
 import org.jetbrains.kotlin.js.analyzer.JsAnalysisResult
 import org.jetbrains.kotlin.js.config.*
@@ -332,20 +334,21 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
 
             val start = System.currentTimeMillis()
 
-            val compiledModule = compile(
+            val granularity = when {
+                arguments.irPerModule -> JsGenerationGranularity.PER_MODULE
+                arguments.irPerFile -> JsGenerationGranularity.PER_FILE
+                else -> JsGenerationGranularity.WHOLE_PROGRAM
+            }
+
+            val ir = compile(
                 module,
                 phaseConfig,
                 if (arguments.irDceDriven) PersistentIrFactory() else IrFactoryImpl,
-                mainArguments = mainCallArguments,
-                generateFullJs = !arguments.irDce,
-                generateDceJs = arguments.irDce,
                 dceRuntimeDiagnostic = RuntimeDiagnostic.resolve(
                     arguments.irDceRuntimeDiagnostic,
                     messageCollector
                 ),
                 dceDriven = arguments.irDceDriven,
-                multiModule = arguments.irPerModule,
-                relativeRequirePath = true,
                 propertyLazyInitialization = arguments.irPropertyLazyInitialization,
                 baseClassIntoMetadata = arguments.irBaseClassInMetadata,
                 safeExternalBoolean = arguments.irSafeExternalBoolean,
@@ -354,11 +357,28 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
                     messageCollector
                 ),
                 lowerPerModule = icCaches.isNotEmpty(),
+                granularity = granularity
             )
 
+            val transformer = IrModuleToJsTransformer(
+                ir.context,
+                mainCallArguments,
+                fullJs = true,
+                dceJs = arguments.irDce,
+                multiModule = arguments.irPerModule,
+                relativeRequirePath = false
+            )
+            val compiledModule: CompilerResult = transformer.generateModule(ir.allModules)
+
             messageCollector.report(INFO, "Executable production duration: ${System.currentTimeMillis() - start}ms")
 
-            val outputs = if (arguments.irDce && !arguments.irDceDriven) compiledModule.outputsAfterDce!! else compiledModule.outputs!!
+
+
+            val outputs = if (arguments.irDce && !arguments.irDceDriven)
+                compiledModule.outputsAfterDce!!
+            else
+                compiledModule.outputs!!
+
             outputFile.write(outputs)
             outputs.dependencies.forEach { (name, content) ->
                 outputFile.resolveSibling("$name.js").write(content)
@@ -495,7 +515,8 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
             K2JsArgumentConstants.MODULE_PLAIN to ModuleKind.PLAIN,
             K2JsArgumentConstants.MODULE_COMMONJS to ModuleKind.COMMON_JS,
             K2JsArgumentConstants.MODULE_AMD to ModuleKind.AMD,
-            K2JsArgumentConstants.MODULE_UMD to ModuleKind.UMD
+            K2JsArgumentConstants.MODULE_UMD to ModuleKind.UMD,
+            K2JsArgumentConstants.MODULE_ES to ModuleKind.ES,
         )
         private val sourceMapContentEmbeddingMap = mapOf(
             K2JsArgumentConstants.SOURCE_MAP_SOURCE_CONTENT_ALWAYS to SourceMapSourceEmbedding.ALWAYS,

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/optimizations/PropertyAccessorInlineLowering.kt

@@ -25,12 +25,18 @@ import org.jetbrains.kotlin.ir.types.isUnit
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 
-class PropertyAccessorInlineLowering(private val context: CommonBackendContext) : BodyLoweringPass {
+open class PropertyAccessorInlineLowering(
+    private val context: CommonBackendContext,
+) : BodyLoweringPass {
 
-    private val IrProperty.isSafeToInline: Boolean get() = isTopLevel || (modality === Modality.FINAL || visibility == DescriptorVisibilities.PRIVATE) || (parent as IrClass).modality === Modality.FINAL
+    fun IrProperty.isSafeToInlineInClosedWorld() =
+        isTopLevel || (modality === Modality.FINAL || visibility == DescriptorVisibilities.PRIVATE) || (parent as IrClass).modality === Modality.FINAL
+
+    open fun IrProperty.isSafeToInline(accessContainer: IrDeclaration): Boolean =
+        isSafeToInlineInClosedWorld()
 
     // TODO: implement general function inlining optimization and replace it with
-    private inner class AccessorInliner : IrElementTransformerVoid() {
+    private inner class AccessorInliner(val container: IrDeclaration) : IrElementTransformerVoid() {
 
         private val unitType = context.irBuiltIns.unitType
 
@@ -38,7 +44,7 @@ class PropertyAccessorInlineLowering(private val context: CommonBackendContext)
             val property = callee.correspondingPropertySymbol?.owner ?: return false
 
             // Some devirtualization required here
-            if (!property.isSafeToInline) return false
+            if (!property.isSafeToInline(container)) return false
 
             val parent = property.parent
             if (parent is IrClass) {
@@ -176,6 +182,6 @@ class PropertyAccessorInlineLowering(private val context: CommonBackendContext)
     }
 
     override fun lower(irBody: IrBody, container: IrDeclaration) {
-        irBody.transformChildrenVoid(AccessorInliner())
+        irBody.transformChildrenVoid(AccessorInliner(container))
     }
 }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsIrBackendContext.kt

@@ -17,6 +17,7 @@ import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
 import org.jetbrains.kotlin.descriptors.impl.EmptyPackageFragmentDescriptor
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation
 import org.jetbrains.kotlin.ir.*
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity
 import org.jetbrains.kotlin.ir.backend.js.ir.JsIrBuilder
 import org.jetbrains.kotlin.ir.backend.js.lower.JsInnerClassesSupport
 import org.jetbrains.kotlin.ir.backend.js.utils.JsInlineClassesUtils
@@ -58,7 +59,8 @@ class JsIrBackendContext(
     val baseClassIntoMetadata: Boolean = false,
     val safeExternalBoolean: Boolean = false,
     val safeExternalBooleanDiagnostic: RuntimeDiagnostic? = null,
-    override val mapping: JsMapping = JsMapping(symbolTable.irFactory)
+    override val mapping: JsMapping = JsMapping(symbolTable.irFactory),
+    val granularity: JsGenerationGranularity = JsGenerationGranularity.WHOLE_PROGRAM,
 ) : JsCommonBackendContext {
     val fileToInitializationFuns: MutableMap<IrFile, IrSimpleFunction?> = mutableMapOf()
     val fileToInitializerPureness: MutableMap<IrFile, Boolean> = mutableMapOf()

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt

@@ -16,6 +16,7 @@ import org.jetbrains.kotlin.backend.common.lower.optimizations.FoldConstantLower
 import org.jetbrains.kotlin.backend.common.lower.optimizations.PropertyAccessorInlineLowering
 import org.jetbrains.kotlin.backend.common.phaser.*
 import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity
 import org.jetbrains.kotlin.ir.backend.js.lower.*
 import org.jetbrains.kotlin.ir.backend.js.lower.calls.CallsLowering
 import org.jetbrains.kotlin.ir.backend.js.lower.cleanup.CleanupLowering
@@ -397,7 +398,7 @@ private val removeInitializersForLazyProperties = makeDeclarationTransformerPhas
 )
 
 private val propertyAccessorInlinerLoweringPhase = makeBodyLoweringPhase(
-    ::PropertyAccessorInlineLowering,
+    ::JsPropertyAccessorInlineLowering,
     name = "PropertyAccessorInlineLowering",
     description = "[Optimization] Inline property accessors"
 )
@@ -775,6 +776,14 @@ private val cleanupLoweringPhase = makeBodyLoweringPhase(
     name = "CleanupLowering",
     description = "Clean up IR before codegen"
 )
+private val moveOpenClassesToSeparatePlaceLowering = makeCustomJsModulePhase(
+    { context, module ->
+        if (context.granularity == JsGenerationGranularity.PER_FILE)
+            moveOpenClassesToSeparateFiles(module)
+    },
+    name = "MoveOpenClassesToSeparateFiles",
+    description = "Move open classes to separate files"
+).toModuleLowering()
 
 private val jsSuspendArityStorePhase = makeDeclarationTransformerPhase(
     ::JsSuspendArityStoreLowering,
@@ -880,6 +889,9 @@ private val loweringList = listOf<Lowering>(
     captureStackTraceInThrowablesPhase,
     callsLoweringPhase,
     cleanupLoweringPhase,
+    // Currently broken due to static members lowering making single-open-class
+    // files non-recognizable as single-class files
+    // moveOpenClassesToSeparatePlaceLowering,
     validateIrAfterLowering,
 )
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/codegen/IrToJs.kt

@@ -0,0 +1,457 @@
+/*
+ * 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.ir.backend.js.codegen
+
+import org.jetbrains.kotlin.descriptors.Modality
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
+import org.jetbrains.kotlin.ir.backend.js.LoweredIr
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity.*
+import org.jetbrains.kotlin.ir.backend.js.export.*
+import org.jetbrains.kotlin.ir.backend.js.lower.StaticMembersLowering
+import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrFileToJsTransformer
+import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.processClassModels
+import org.jetbrains.kotlin.ir.backend.js.utils.*
+import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.types.classOrNull
+import org.jetbrains.kotlin.ir.util.file
+import org.jetbrains.kotlin.ir.util.fqNameWhenAvailable
+import org.jetbrains.kotlin.ir.util.hasInterfaceParent
+import org.jetbrains.kotlin.ir.util.isInterface
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
+import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
+import org.jetbrains.kotlin.ir.visitors.acceptVoid
+import org.jetbrains.kotlin.js.backend.ast.*
+import org.jetbrains.kotlin.serialization.js.ModuleKind
+import kotlin.math.abs
+
+interface CompilerOutputSink {
+    fun write(module: String, path: String, content: String)
+}
+
+class JsGenerationOptions(
+    val jsExtension: String = "js",
+    val generatePackageJson: Boolean = false,
+    val generateTypeScriptDefinitions: Boolean = false,
+)
+
+class IrToJs(
+    private val backendContext: JsIrBackendContext,
+    private val guid: (IrDeclaration) -> String,
+    private val outputSink: CompilerOutputSink,
+    private val mainArguments: List<String>?,
+    private val granularity: JsGenerationGranularity,
+    private val mainModuleName: String,
+    private val options: JsGenerationOptions,
+) {
+    val indexFileName = "index.${options.jsExtension}"
+
+    val FileUnit.initFunctionName
+        get() = "KotlinInit$" + sanitizeName(pathToJsModule(file))
+
+    sealed class CodegenUnitReference
+    object ThisUnitReference : CodegenUnitReference()
+    inner class OtherUnitReference(
+        module: IrModuleFragment,
+    ) : CodegenUnitReference() {
+        // Path to entry point of other module from "top-level", e.g. directory which contains all other modules
+        val importPath = "./" + module.jsModuleName + "/" + indexFileName
+    }
+
+    abstract class CodegenUnit {
+        abstract val packageFragments: Iterable<IrPackageFragment>
+        abstract val externalPackageFragments: Iterable<IrPackageFragment>
+        abstract fun referenceCodegenUnitOfDeclaration(declaration: IrDeclaration): CodegenUnitReference
+        abstract val pathToKotlinModulesRoot: String
+    }
+
+    inner class FileUnit(val file: IrFile, val externalFile: IrFile?) : CodegenUnit() {
+        override val packageFragments =
+            listOf(file)
+
+        override val externalPackageFragments =
+            listOfNotNull(externalFile)
+
+        override fun referenceCodegenUnitOfDeclaration(declaration: IrDeclaration): CodegenUnitReference =
+            when (val declarationFile = declaration.file) {
+                file -> ThisUnitReference
+                else -> OtherUnitReference(declarationFile.module)
+            }
+
+        override val pathToKotlinModulesRoot: String by lazy {
+            "../".repeat(file.fqName.pathSegments().size + 1)
+        }
+    }
+
+    inner class ModuleUnit(val module: IrModuleFragment) : CodegenUnit() {
+        override val packageFragments: Iterable<IrPackageFragment> =
+            module.files
+
+        override val externalPackageFragments: Iterable<IrPackageFragment> =
+            packageFragments.mapNotNull { backendContext.externalPackageFragment[it.symbol] }
+
+        override fun referenceCodegenUnitOfDeclaration(declaration: IrDeclaration): CodegenUnitReference =
+            when (val declarationModule = declaration.file.module) {
+                module -> ThisUnitReference
+                else -> OtherUnitReference(declarationModule)
+            }
+
+        override val pathToKotlinModulesRoot: String = "../"
+    }
+
+    class WholeProgramUnit(
+        val modules: Iterable<IrModuleFragment>,
+        val externalModules: Iterable<IrPackageFragment>
+    ) : CodegenUnit() {
+        override val packageFragments: Iterable<IrPackageFragment> =
+            modules.flatMap { it.files }
+
+        override val externalPackageFragments: Iterable<IrPackageFragment>
+            get() = externalModules
+
+        override fun referenceCodegenUnitOfDeclaration(declaration: IrDeclaration): CodegenUnitReference =
+            ThisUnitReference
+
+        override val pathToKotlinModulesRoot: String
+            get() = "../"
+    }
+
+    private fun pathToJsModule(file: IrFile): String =
+        "${fileJsRootModuleName(file)}/${fileJsSubModulePath(file)}"
+
+    private fun fileJsRootModuleName(file: IrFile): String =
+        when (granularity) {
+            WHOLE_PROGRAM -> mainModuleName
+            PER_MODULE, PER_FILE -> file.module.jsModuleName
+        }
+
+    private fun fileJsSubModulePath(file: IrFile): String =
+        when (granularity) {
+            WHOLE_PROGRAM, PER_MODULE -> indexFileName
+
+            PER_FILE -> {
+                val maybeSingleOpenClass = (file.declarations.singleOrNull() as? IrClass)?.takeIf {
+                    it.modality == Modality.ABSTRACT || it.modality == Modality.OPEN
+                }
+
+                val hash = abs((maybeSingleOpenClass?.let { guid(it) } ?: file.path).hashCode())
+                val filePrefix = maybeSingleOpenClass?.name?.asString()?.let { sanitizeName(it) + ".class" } ?: file.name
+                val fileName = "${filePrefix}_$hash.${options.jsExtension}"
+                val packagePath = file.fqName.pathSegments().joinToString("") { it.identifier + "/" }
+                "$packagePath$fileName"
+            }
+        }
+
+    class GeneratedUnit(
+        val jsStatements: List<JsStatement>,
+        val exportedDeclarations: List<ExportedDeclaration>,
+    )
+
+    fun generateUnit(unit: CodegenUnit): GeneratedUnit {
+        val exportedDeclarations: List<ExportedDeclaration> =
+            with(ExportModelGenerator(backendContext, generateNamespacesForPackages = false)) {
+                (unit.externalPackageFragments + unit.packageFragments).flatMap { packageFragment ->
+                    generateExport(packageFragment)
+                }
+            }
+
+        val stableNames: Set<String> = collectStableNames(unit)
+        val nameGenerator = NewNamerImpl(backendContext, unit, guid, stableNames)
+
+        val staticContext = JsStaticContext(
+            backendContext = backendContext,
+            irNamer = nameGenerator,
+            globalNameScope = nameGenerator.staticNames
+        )
+
+        val rootContext = JsGenerationContext(
+            currentFunction = null,
+            currentFile = null,
+            staticContext = staticContext,
+            localNames = LocalNameGenerator(NameTable())
+        )
+
+
+        val declarationStatements: List<JsStatement> = unit.packageFragments.flatMap {
+            StaticMembersLowering(backendContext).lower(it as IrFile)
+            it.accept(IrFileToJsTransformer(), rootContext).statements
+        }
+
+        val preDeclarationBlock = JsGlobalBlock()
+        val postDeclarationBlock = JsGlobalBlock()
+        processClassModels(rootContext.staticContext.classModels, preDeclarationBlock, postDeclarationBlock)
+
+        val statements = mutableListOf<JsStatement>()
+        statements += nameGenerator.internalImports.values
+        statements += preDeclarationBlock
+        statements += declarationStatements
+        statements += postDeclarationBlock
+
+        // Generate module initialization
+
+        val initializerBlock = rootContext.staticContext.initializerBlock
+        when (unit) {
+            is WholeProgramUnit, is ModuleUnit -> {
+                // Run initialization during ES module initialization
+                statements += initializerBlock
+            }
+
+            is FileUnit -> {
+                // Postpone initialization by putting it into a separate function
+                // Will be called later in proper order after class model is initialized
+                val initFunction = JsFunction(emptyScope, JsBlock(initializerBlock.statements), "init fun")
+                initFunction.name = JsName(unit.initFunctionName)
+                statements += initFunction.makeStmt()
+                statements += JsExport(initFunction.name)
+            }
+        }
+
+        // Generate internal export
+
+        val internalExports = mutableListOf<JsExport.Element>()
+        fun export(declaration: IrDeclarationWithName) {
+            internalExports += JsExport.Element(nameGenerator.getNameForStaticDeclaration(declaration), JsName(guid(declaration)))
+        }
+
+        for (fragment in unit.packageFragments) {
+            for (declaration in fragment.declarations) {
+                if (declaration is IrDeclarationWithName) {
+                    export(declaration)
+                }
+
+                // Default implementations of interface methods are nested under interface declarations in IR at this point,
+                // but they are effectively used as a static declaration and can be directly referenced by other codegen unit,
+                // thus requiring internal export
+                declaration.acceptChildrenVoid(object : IrElementVisitorVoid {
+                    override fun visitElement(element: IrElement) {
+                        element.acceptChildrenVoid(this)
+                    }
+
+                    override fun visitSimpleFunction(declaration: IrSimpleFunction) {
+                        if (declaration.hasInterfaceParent() && declaration.body != null) {
+                            export(declaration)
+                        }
+                        super.visitSimpleFunction(declaration)
+                    }
+                })
+            }
+        }
+        statements += JsExport(JsExport.Subject.Elements(internalExports), null)
+
+        // Generate external export
+
+        val globalNames = NameTable<String>(nameGenerator.staticNames)
+        val exporter = ExportModelToJsStatements(
+            nameGenerator,
+            declareNewNamespace = { globalNames.declareFreshName(it, it) }
+        )
+        exportedDeclarations.forEach {
+            statements += exporter.generateDeclarationExport(it, null)
+        }
+
+        return GeneratedUnit(statements, exportedDeclarations)
+    }
+
+    private fun collectStableNames(unit: CodegenUnit): Set<String> {
+        val newStableStaticNamesCollectorVisitor =
+            NewStableStaticNamesCollectorVisitor(needToCollectReferences = granularity != WHOLE_PROGRAM)
+        unit.packageFragments.forEach { it.acceptVoid(newStableStaticNamesCollectorVisitor) }
+        unit.externalPackageFragments.forEach { it.acceptVoid(newStableStaticNamesCollectorVisitor) }
+
+        return newStableStaticNamesCollectorVisitor.collectedStableNames
+    }
+
+    // Returns import statement and call expression
+    private fun invokeFunctionFromEntryJsFile(
+        function: IrFunction,
+        args: List<JsExpression> = emptyList()
+    ): Pair<JsStatement, JsExpression> {
+        val name = guid(function)
+        val importPath = if (granularity == WHOLE_PROGRAM) "./$indexFileName" else "../" + pathToJsModule(function.file)
+        return Pair(
+            JsImport(importPath, mutableListOf(JsImport.Element(name, null))),
+            JsInvocation(JsNameRef(name), args)
+        )
+    }
+
+    private fun invokeFunctionFromEntryJsFileAsStatements(
+        function: IrFunction,
+        args: List<JsExpression> = emptyList()
+    ): List<JsStatement> =
+        invokeFunctionFromEntryJsFile(function, args)
+            .let { listOf(it.first, it.second.makeStmt()) }
+
+    fun generateModules(
+        mainModule: IrModuleFragment,
+        allModules: List<IrModuleFragment>
+    ) {
+        when (granularity) {
+            WHOLE_PROGRAM ->
+                generateModule(mainModule, allModules)
+
+            PER_MODULE,
+            PER_FILE ->
+                allModules.forEach { module ->
+                    generateModule(mainModule = module, allModules = emptyList())
+                }
+        }
+    }
+
+    fun generateModuleLevelCode(module: IrModuleFragment, statements: MutableList<JsStatement>) {
+        if (mainArguments != null) {
+            val mainFunction = JsMainFunctionDetector(backendContext).getMainFunctionOrNull(module)
+            if (mainFunction != null) {
+                val generateArgv = mainFunction.valueParameters.firstOrNull()?.isStringArrayParameter() ?: false
+                val generateContinuation = mainFunction.isLoweredSuspendFunction(backendContext)
+
+                val mainArgumentsArray =
+                    if (generateArgv)
+                        JsArrayLiteral(mainArguments.map { JsStringLiteral(it) })
+                    else
+                        null
+
+                val continuation =
+                    if (generateContinuation) {
+                        val (import, invoke) = invokeFunctionFromEntryJsFile(backendContext.coroutineEmptyContinuation.owner.getter!!)
+                        statements += import
+                        invoke
+                    } else
+                        null
+
+                statements += invokeFunctionFromEntryJsFileAsStatements(
+                    mainFunction, listOfNotNull(mainArgumentsArray, continuation)
+                )
+            }
+        }
+
+        backendContext.testRoots[module]?.let { testContainer ->
+            statements += invokeFunctionFromEntryJsFileAsStatements(testContainer)
+        }
+    }
+
+    fun generateModule(
+        mainModule: IrModuleFragment,
+        allModules: List<IrModuleFragment>,
+    ) {
+        val moduleName = mainModule.jsModuleName
+        val indexJsStatements = mutableListOf<JsStatement>()
+        val exportedDeclarations = mutableListOf<ExportedDeclaration>()
+
+        when (granularity) {
+            PER_FILE -> {
+                for (file in mainModule.files.sortedBy(::fileInitOrder)) {
+                    if (file.declarations.isEmpty()) continue
+
+                    val pathToSubModule = fileJsSubModulePath(file)
+                    indexJsStatements += JsExport(JsExport.Subject.All, fromModule = "./$pathToSubModule")
+
+                    val unit = FileUnit(file, backendContext.externalPackageFragment[file.symbol])
+                    val generatedUnit = generateUnit(unit)
+
+                    val importElements = JsImport.Element(unit.initFunctionName, null)
+                    indexJsStatements += JsImport("./$pathToSubModule", mutableListOf(importElements))
+                    indexJsStatements += JsInvocation(JsNameRef(JsName(unit.initFunctionName))).makeStmt()
+
+                    exportedDeclarations += generatedUnit.exportedDeclarations
+
+                    outputSink.write(
+                        file.module.jsModuleName,
+                        pathToSubModule,
+                        "// Kotlin file: ${file.path}\n" + generatedUnit.jsStatements.toJsCodeString()
+                    )
+                }
+                generateModuleLevelCode(mainModule, indexJsStatements)
+            }
+
+            PER_MODULE -> {
+                val generatedUnit = generateUnit(ModuleUnit(mainModule))
+                indexJsStatements += generatedUnit.jsStatements
+                generateModuleLevelCode(mainModule, indexJsStatements)
+                exportedDeclarations += generatedUnit.exportedDeclarations
+            }
+
+            WHOLE_PROGRAM -> {
+                val generatedUnit = generateUnit(WholeProgramUnit(allModules, backendContext.externalPackageFragment.values))
+                indexJsStatements += generatedUnit.jsStatements
+                allModules.forEach {
+                    generateModuleLevelCode(it, indexJsStatements)
+                }
+                exportedDeclarations += generatedUnit.exportedDeclarations
+            }
+        }
+
+        outputSink.write(moduleName, indexFileName, indexJsStatements.toJsCodeString())
+
+        if (options.generatePackageJson) {
+            outputSink.write(moduleName, "package.json", """{ "main": "$indexFileName", "type": "module" }""")
+        }
+
+        if (options.generateTypeScriptDefinitions && exportedDeclarations.isNotEmpty()) {
+            val dts = ExportedModule(moduleName, moduleKind = ModuleKind.ES, exportedDeclarations).toTypeScript()
+            outputSink.write(moduleName, "index.d.ts", dts)
+        }
+    }
+
+    private fun fileInitOrder(file: IrFile): Int =
+        when (val singleDeclaration = file.declarations.singleOrNull()) {
+            // Initialize parent classes before child classes
+            //  TODO: Comment about open classes in separate files
+            is IrClass -> singleDeclaration.getInheritanceChainLength()
+            // Initialize regular files after all open classes
+            else -> Int.MAX_VALUE
+        }
+
+    private fun IrClass.getInheritanceChainLength(): Int {
+        if (symbol == backendContext.irBuiltIns.anyClass)
+            return 0
+
+        // FIXME: Filter out interfaces
+        superTypes.forEach { superType ->
+            val superClass: IrClass? = superType.classOrNull?.owner
+            if (superClass != null && /* !!! */ !superClass.isInterface)
+                return superClass.getInheritanceChainLength() + 1
+        }
+
+
+        return 1
+    }
+}
+
+private val IrModuleFragment.jsModuleName: String
+    get() = name.asString().dropWhile { it == '<' }.dropLastWhile { it == '>' }
+
+private fun List<JsStatement>.toJsCodeString(): String =
+    JsGlobalBlock().also { it.statements += this }.toString()
+
+enum class JsGenerationGranularity {
+    WHOLE_PROGRAM,
+    PER_MODULE,
+    PER_FILE
+}
+
+fun generateEsModules(
+    ir: LoweredIr,
+    outputSink: CompilerOutputSink,
+    mainArguments: List<String>?,
+    granularity: JsGenerationGranularity,
+    options: JsGenerationOptions,
+) {
+    // Declaration numeration to create temporary GUID
+    // TODO: Replace with an actual GUID
+    val numerator = StaticDeclarationNumerator()
+    ir.allModules.forEach { numerator.add(it) }
+
+    fun guid(declaration: IrDeclaration): String {
+        val name = sanitizeName((declaration as IrDeclarationWithName).name.toString())
+        val number = numerator.numeration[declaration]
+            ?: error("Can't find number for declaration ${declaration.fqNameWhenAvailable}")
+        // TODO: Use shorter names in release mode
+        return "${name}_GUID_${number}"
+    }
+
+    val ir2js = IrToJs(ir.context, ::guid, outputSink, mainArguments, granularity, ir.mainModule.jsModuleName, options)
+    ir2js.generateModules(ir.mainModule, ir.allModules)
+}

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/compiler.kt

@@ -8,6 +8,9 @@ package org.jetbrains.kotlin.ir.backend.js
 import org.jetbrains.kotlin.backend.common.lower
 import org.jetbrains.kotlin.backend.common.phaser.PhaseConfig
 import org.jetbrains.kotlin.backend.common.phaser.invokeToplevel
+import org.jetbrains.kotlin.config.CompilerConfiguration
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity
+import org.jetbrains.kotlin.ir.backend.js.ic.SerializedIcData
 import org.jetbrains.kotlin.ir.backend.js.ic.ModuleCache
 import org.jetbrains.kotlin.ir.backend.js.ic.icCompile
 import org.jetbrains.kotlin.ir.backend.js.lower.generateTests
@@ -37,39 +40,36 @@ class CompilationOutputs(
     val dependencies: Iterable<Pair<String, CompilationOutputs>> = emptyList()
 )
 
+class LoweredIr(
+    val context: JsIrBackendContext,
+    val mainModule: IrModuleFragment,
+    val allModules: List<IrModuleFragment>
+)
+
 fun compile(
     depsDescriptors: ModulesStructure,
     phaseConfig: PhaseConfig,
     irFactory: IrFactory,
-    mainArguments: List<String>?,
     exportedDeclarations: Set<FqName> = emptySet(),
-    generateFullJs: Boolean = true,
-    generateDceJs: Boolean = false,
     dceDriven: Boolean = false,
     dceRuntimeDiagnostic: RuntimeDiagnostic? = null,
     es6mode: Boolean = false,
-    multiModule: Boolean = false,
-    relativeRequirePath: Boolean = false,
     propertyLazyInitialization: Boolean,
     verifySignatures: Boolean = true,
     baseClassIntoMetadata: Boolean = false,
     lowerPerModule: Boolean = false,
     safeExternalBoolean: Boolean = false,
     safeExternalBooleanDiagnostic: RuntimeDiagnostic? = null,
-    filesToLower: Set<String>? = null
-): CompilerResult {
+    filesToLower: Set<String>? = null,
+    granularity: JsGenerationGranularity = JsGenerationGranularity.WHOLE_PROGRAM,
+): LoweredIr {
 
     if (lowerPerModule) {
         return icCompile(
             depsDescriptors,
-            mainArguments,
             exportedDeclarations,
-            generateFullJs,
-            generateDceJs,
             dceRuntimeDiagnostic,
             es6mode,
-            multiModule,
-            relativeRequirePath,
             propertyLazyInitialization,
             baseClassIntoMetadata,
             safeExternalBoolean,
@@ -77,7 +77,7 @@ fun compile(
         )
     }
 
-    val (moduleFragment: IrModuleFragment, dependencyModules, irBuiltIns, symbolTable, deserializer, moduleToName) =
+    val (moduleFragment: IrModuleFragment, dependencyModules, irBuiltIns, symbolTable, deserializer, _) =
         loadIr(depsDescriptors, irFactory, verifySignatures, filesToLower, loadFunctionInterfacesIntoStdlib = true)
 
     val mainModule = depsDescriptors.mainModule
@@ -102,7 +102,8 @@ fun compile(
         propertyLazyInitialization = propertyLazyInitialization,
         baseClassIntoMetadata = baseClassIntoMetadata,
         safeExternalBoolean = safeExternalBoolean,
-        safeExternalBooleanDiagnostic = safeExternalBooleanDiagnostic
+        safeExternalBooleanDiagnostic = safeExternalBooleanDiagnostic,
+        granularity = granularity
     )
 
     // Load declarations referenced during `context` initialization
@@ -130,17 +131,6 @@ fun compile(
         eliminateDeadDeclarations(allModules, context)
 
         irFactory.stageController = StageController(controller.currentStage)
-
-        val transformer = IrModuleToJsTransformer(
-            context,
-            mainArguments,
-            fullJs = true,
-            dceJs = false,
-            multiModule = multiModule,
-            relativeRequirePath = relativeRequirePath,
-            moduleToName = moduleToName,
-        )
-        return transformer.generateModule(allModules)
     } else {
         // TODO is this reachable when lowerPerModule == true?
         if (lowerPerModule) {
@@ -154,18 +144,9 @@ fun compile(
         } else {
             jsPhases.invokeToplevel(phaseConfig, context, allModules)
         }
-
-        val transformer = IrModuleToJsTransformer(
-            context,
-            mainArguments,
-            fullJs = generateFullJs,
-            dceJs = generateDceJs,
-            multiModule = multiModule,
-            relativeRequirePath = relativeRequirePath,
-            moduleToName = moduleToName,
-        )
-        return transformer.generateModule(allModules)
     }
+
+    return LoweredIr(context, moduleFragment, allModules)
 }
 
 fun lowerPreservingIcData(module: IrModuleFragment, context: JsIrBackendContext, controller: WholeWorldStageController) {

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/export/ExportModelGenerator.kt

@@ -26,24 +26,28 @@ import org.jetbrains.kotlin.ir.symbols.IrTypeParameterSymbol
 import org.jetbrains.kotlin.ir.types.*
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.js.config.JSConfigurationKeys
+import org.jetbrains.kotlin.serialization.js.ModuleKind
 import org.jetbrains.kotlin.utils.addIfNotNull
 
-class ExportModelGenerator(val context: JsIrBackendContext) {
+class ExportModelGenerator(
+    val context: JsIrBackendContext,
+    val generateNamespacesForPackages: Boolean
+) {
 
     fun generateExport(file: IrPackageFragment): List<ExportedDeclaration> {
         val namespaceFqName = file.fqName
         val exports = file.declarations.flatMap { declaration -> listOfNotNull(exportDeclaration(declaration)) }
         return when {
             exports.isEmpty() -> emptyList()
-            namespaceFqName.isRoot -> exports
+            !generateNamespacesForPackages || namespaceFqName.isRoot -> exports
             else -> listOf(ExportedNamespace(namespaceFqName.toString(), exports))
         }
     }
 
-    fun generateExport(modules: Iterable<IrModuleFragment>): ExportedModule =
+    fun generateExport(modules: Iterable<IrModuleFragment>, moduleKind: ModuleKind = ModuleKind.PLAIN): ExportedModule =
         ExportedModule(
             context.configuration[CommonConfigurationKeys.MODULE_NAME]!!,
-            context.configuration[JSConfigurationKeys.MODULE_KIND]!!,
+            moduleKind,
             (context.externalPackageFragment.values + modules.flatMap { it.files }).flatMap {
                 generateExport(it)
             }
@@ -296,7 +300,7 @@ class ExportModelGenerator(val context: JsIrBackendContext) {
 
             classifier is IrClassSymbol -> {
                 val klass = classifier.owner
-                val name = klass.fqNameWhenAvailable!!.asString()
+                val name = if (generateNamespacesForPackages) klass.fqNameWhenAvailable!!.asString() else klass.name.asString()
 
                 when (klass.kind) {
                     ClassKind.ANNOTATION_CLASS,

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/export/ExportModelToJsStatements.kt

@@ -11,25 +11,24 @@ import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.jsAssignment
 import org.jetbrains.kotlin.ir.backend.js.utils.IrNamer
 import org.jetbrains.kotlin.js.backend.ast.*
 
-
 class ExportModelToJsStatements(
-    private val internalModuleName: JsName,
     private val namer: IrNamer,
     private val declareNewNamespace: (String) -> String
 ) {
     private val namespaceToRefMap = mutableMapOf<String, JsNameRef>()
 
-    fun generateModuleExport(module: ExportedModule): List<JsStatement> {
+    fun generateModuleExport(module: ExportedModule, internalModuleName: JsName): List<JsStatement> {
         return module.declarations.flatMap { generateDeclarationExport(it, JsNameRef(internalModuleName)) }
     }
 
-    private fun generateDeclarationExport(declaration: ExportedDeclaration, namespace: JsNameRef): List<JsStatement> {
+    fun generateDeclarationExport(declaration: ExportedDeclaration, namespace: JsNameRef?): List<JsStatement> {
         return when (declaration) {
             is ExportedNamespace -> {
+                require(namespace != null) { "Only namespaced namespaces are allowed" }
                 val statements = mutableListOf<JsStatement>()
                 val elements = declaration.name.split(".")
                 var currentNamespace = ""
-                var currentRef = namespace
+                var currentRef: JsNameRef = namespace
                 for (element in elements) {
                     val newNamespace = "$currentNamespace$$element"
                     val newNameSpaceRef = namespaceToRefMap.getOrPut(newNamespace) {
@@ -37,14 +36,15 @@ class ExportModelToJsStatements(
                         val varRef = JsNameRef(varName)
                         val namespaceRef = JsNameRef(element, currentRef)
                         statements += JsVars(
-                            JsVars.JsVar(JsName(varName),
-                                         JsAstUtils.or(
-                                             namespaceRef,
-                                             jsAssignment(
-                                                 namespaceRef,
-                                                 JsObjectLiteral()
-                                             )
-                                         )
+                            JsVars.JsVar(
+                                JsName(varName),
+                                JsAstUtils.or(
+                                    namespaceRef,
+                                    jsAssignment(
+                                        namespaceRef,
+                                        JsObjectLiteral()
+                                    )
+                                )
                             )
                         )
                         varRef
@@ -56,17 +56,23 @@ class ExportModelToJsStatements(
             }
 
             is ExportedFunction -> {
-                listOf(
-                    jsAssignment(
-                        JsNameRef(declaration.name, namespace),
-                        JsNameRef(namer.getNameForStaticDeclaration(declaration.ir))
-                    ).makeStmt()
-                )
+                val name = namer.getNameForStaticDeclaration(declaration.ir)
+                if (namespace == null) {
+                    listOf(JsExport(name, alias = JsName(declaration.name)))
+                } else {
+                    listOf(
+                        jsAssignment(
+                            JsNameRef(declaration.name, namespace),
+                            JsNameRef(name)
+                        ).makeStmt()
+                    )
+                }
             }
 
             is ExportedConstructor -> emptyList()
 
             is ExportedProperty -> {
+                require(namespace != null) { "Only namespaced properties are allowed" }
                 val getter = declaration.irGetter?.let { JsNameRef(namer.getNameForStaticDeclaration(it)) }
                 val setter = declaration.irSetter?.let { JsNameRef(namer.getNameForStaticDeclaration(it)) }
                 listOf(defineProperty(namespace, declaration.name, getter, setter).makeStmt())
@@ -77,14 +83,16 @@ class ExportModelToJsStatements(
             is ExportedClass -> {
                 if (declaration.isInterface) return emptyList()
                 val newNameSpace = JsNameRef(declaration.name, namespace)
-                val klassExport = jsAssignment(
-                    newNameSpace,
-                    JsNameRef(
-                        namer.getNameForStaticDeclaration(
-                            declaration.ir
-                        )
-                    )
-                ).makeStmt()
+                val name = namer.getNameForStaticDeclaration(declaration.ir)
+                val klassExport =
+                    if (namespace == null) {
+                        JsExport(name, alias = JsName(declaration.name))
+                    } else {
+                        jsAssignment(
+                            newNameSpace,
+                            JsNameRef(name)
+                        ).makeStmt()
+                    }
 
                 // These are only used when exporting secondary constructors annotated with @JsName
                 val staticFunctions = declaration.members.filter { it is ExportedFunction && it.isStatic }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/export/ExportModelToTsDeclarations.kt

@@ -26,7 +26,7 @@ fun ExportedModule.toTypeScript(): String {
 
     return when (moduleKind) {
         ModuleKind.PLAIN -> "declare namespace $namespaceName {\n$declarationsDts\n}\n"
-        ModuleKind.AMD, ModuleKind.COMMON_JS -> declarationsDts
+        ModuleKind.AMD, ModuleKind.COMMON_JS, ModuleKind.ES -> declarationsDts
         ModuleKind.UMD -> "$declarationsDts\nexport as namespace $namespaceName;"
     }
 }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/ic/ic.kt

@@ -123,25 +123,20 @@ private fun dumpIr(module: IrModuleFragment, fileName: String) {
 
 fun icCompile(
     depsDescriptor: ModulesStructure,
-    mainArguments: List<String>?,
     exportedDeclarations: Set<FqName> = emptySet(),
-    generateFullJs: Boolean = true,
-    generateDceJs: Boolean = false,
     dceRuntimeDiagnostic: RuntimeDiagnostic? = null,
     es6mode: Boolean = false,
-    multiModule: Boolean = false,
-    relativeRequirePath: Boolean = false,
     propertyLazyInitialization: Boolean,
     baseClassIntoMetadata: Boolean = false,
     safeExternalBoolean: Boolean = false,
     safeExternalBooleanDiagnostic: RuntimeDiagnostic? = null,
-): CompilerResult {
+): LoweredIr {
 
     val irFactory = PersistentIrFactory()
     val controller = WholeWorldStageController()
     irFactory.stageController = controller
 
-    val (context, _, allModules, moduleToName, loweredIrLoaded) = prepareIr(
+    val (context, _, allModules, _, loweredIrLoaded) = prepareIr(
         depsDescriptor,
         exportedDeclarations,
         dceRuntimeDiagnostic,
@@ -155,8 +150,6 @@ fun icCompile(
 
     val modulesToLower = allModules.filter { it !in loweredIrLoaded }
 
-
-
     if (!modulesToLower.isEmpty()) {
         // This won't work incrementally
         modulesToLower.forEach { module ->
@@ -172,20 +165,7 @@ fun icCompile(
 
 //    dumpIr(allModules.first(), "simple-dump${if (useStdlibCache) "-actual" else ""}")
 
-    val transformer = IrModuleToJsTransformer(
-        context,
-        mainArguments,
-        fullJs = generateFullJs,
-        dceJs = generateDceJs,
-        multiModule = multiModule,
-        relativeRequirePath = relativeRequirePath,
-        moduleToName = moduleToName,
-        removeUnusedAssociatedObjects = false,
-    )
-
-    irFactory.stageController = object : StageController(999) {}
-
-    return transformer.generateModule(allModules)
+    return LoweredIr(context, allModules.last(), allModules)
 }
 
 fun lowerPreservingIcData(module: IrModuleFragment, context: JsIrBackendContext, controller: WholeWorldStageController) {

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/JsPropertyAccessorInlineLowering.kt

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2010-2021 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.ir.backend.js.lower
+
+import org.jetbrains.kotlin.backend.common.lower.optimizations.PropertyAccessorInlineLowering
+import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity
+import org.jetbrains.kotlin.ir.declarations.IrDeclaration
+import org.jetbrains.kotlin.ir.declarations.IrProperty
+import org.jetbrains.kotlin.ir.util.fileOrNull
+
+class JsPropertyAccessorInlineLowering(
+    val context: JsIrBackendContext
+) : PropertyAccessorInlineLowering(context) {
+    override fun IrProperty.isSafeToInline(accessContainer: IrDeclaration): Boolean {
+        if (!isSafeToInlineInClosedWorld())
+            return false
+
+        if (isConst)
+            return true
+
+        return when (context.granularity) {
+            JsGenerationGranularity.WHOLE_PROGRAM ->
+                true
+            JsGenerationGranularity.PER_MODULE -> {
+                val accessModule = accessContainer.fileOrNull?.module ?: return false
+                val module = fileOrNull?.module ?: return false
+                accessModule == module
+            }
+            JsGenerationGranularity.PER_FILE ->
+                // Not inlining because
+                //   1. we need a way to distinguish per-file generation units
+                //   2. per-file mode intended for debug builds only at the moment
+                false
+        }
+    }
+}

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/MoveOpenClassesToSeparateFiles.kt

@@ -0,0 +1,61 @@
+/*
+ * 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.ir.backend.js.lower
+
+import org.jetbrains.kotlin.descriptors.ClassKind
+import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
+import org.jetbrains.kotlin.descriptors.Modality
+import org.jetbrains.kotlin.ir.declarations.IrClass
+import org.jetbrains.kotlin.ir.declarations.IrDeclarationContainer
+import org.jetbrains.kotlin.ir.declarations.IrFile
+import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
+import org.jetbrains.kotlin.ir.declarations.impl.IrFileImpl
+import org.jetbrains.kotlin.ir.symbols.impl.IrFileSymbolImpl
+import org.jetbrains.kotlin.ir.util.transformDeclarationsFlat
+import org.jetbrains.kotlin.ir.util.transformFlat
+
+fun moveOpenClassesToSeparateFiles(moduleFragment: IrModuleFragment) {
+    fun createFile(file: IrFile, klass: IrClass): IrFile =
+        IrFileImpl(fileEntry = file.fileEntry, fqName = file.fqName, symbol = IrFileSymbolImpl(), module = file.module).also {
+            it.annotations += file.annotations
+            it.declarations += klass
+            klass.parent = it
+        }
+
+    moduleFragment.files.transformFlat { file ->
+        // We don't have to split declarations with a single class
+        if (file.declarations.size <= 1)
+            return@transformFlat null
+
+        val openClasses = mutableListOf<IrClass>()
+        fun removeAndCollectOpenClasses(container: IrDeclarationContainer) {
+            container.transformDeclarationsFlat { declaration ->
+                if (declaration is IrDeclarationContainer) {
+                    removeAndCollectOpenClasses(declaration)
+                }
+                if (
+                    declaration is IrClass &&
+                    (declaration.modality == Modality.OPEN || declaration.modality == Modality.ABSTRACT) &&
+                    declaration.kind == ClassKind.CLASS &&
+                    declaration.visibility != DescriptorVisibilities.PRIVATE &&
+                    declaration.visibility != DescriptorVisibilities.LOCAL
+                ) {
+                    openClasses += declaration
+                    emptyList()
+                } else {
+                    null
+                }
+            }
+        }
+        removeAndCollectOpenClasses(file)
+
+        return@transformFlat if (openClasses.isEmpty())
+            null
+        else
+            listOf(file) + openClasses.map { createFile(file, it) }
+    }
+}
+

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrFileToJsTransformer.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.ir.backend.js.transformers.irToJs
 
 import org.jetbrains.kotlin.ir.backend.js.utils.JsGenerationContext
 import org.jetbrains.kotlin.ir.declarations.IrFile
+import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
 import org.jetbrains.kotlin.js.backend.ast.JsBlock
 import org.jetbrains.kotlin.js.backend.ast.JsGlobalBlock
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrFunctionToJsTransformer.kt

@@ -6,15 +6,19 @@
 package org.jetbrains.kotlin.ir.backend.js.transformers.irToJs
 
 import org.jetbrains.kotlin.ir.backend.js.utils.JsGenerationContext
+import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrConstructor
 import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
+import org.jetbrains.kotlin.ir.util.isInterface
 import org.jetbrains.kotlin.js.backend.ast.JsFunction
 
 @Suppress("PARAMETER_NAME_CHANGED_ON_OVERRIDE")
 class IrFunctionToJsTransformer : BaseIrElementToJsNodeTransformer<JsFunction, JsGenerationContext> {
     override fun visitSimpleFunction(declaration: IrSimpleFunction, context: JsGenerationContext): JsFunction {
-        val funcName = if (declaration.dispatchReceiverParameter == null) {
+        val parentClass = declaration.parent as? IrClass
+        val isInterfaceDefaultImpl = parentClass?.isInterface ?: false
+        val funcName = if (declaration.dispatchReceiverParameter == null || isInterfaceDefaultImpl) {
             if (declaration.parent is IrFunction) {
                 context.getNameForValueDeclaration(declaration)
             } else {

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/IrModuleToJsTransformer.kt

@@ -23,6 +23,7 @@ import org.jetbrains.kotlin.js.backend.JsToStringGenerationVisitor
 import org.jetbrains.kotlin.js.backend.NoOpSourceLocationConsumer
 import org.jetbrains.kotlin.js.backend.ast.*
 import org.jetbrains.kotlin.js.config.JSConfigurationKeys
+import org.jetbrains.kotlin.serialization.js.ModuleKind
 import org.jetbrains.kotlin.js.config.SourceMapSourceEmbedding
 import org.jetbrains.kotlin.js.sourceMap.SourceFilePathResolver
 import org.jetbrains.kotlin.js.sourceMap.SourceMap3Builder
@@ -52,17 +53,14 @@ class IrModuleToJsTransformer(
             ) + packageLevelJsModules
         }
 
-        val exportedModule = ExportModelGenerator(backendContext).generateExport(modules)
+        val moduleKind: ModuleKind = backendContext.configuration[JSConfigurationKeys.MODULE_KIND]!!
+        val exportedModule = ExportModelGenerator(backendContext, generateNamespacesForPackages = true).generateExport(modules, moduleKind = moduleKind)
         val dts = exportedModule.toTypeScript()
 
         modules.forEach { module ->
             module.files.forEach { StaticMembersLowering(backendContext).lower(it) }
         }
 
-        if (multiModule) {
-            breakCrossModuleFieldAccess(backendContext, modules)
-        }
-
         modules.forEach { module ->
             namer.merge(module.files, additionalPackages)
         }
@@ -103,7 +101,7 @@ class IrModuleToJsTransformer(
             val dependencies = others.mapIndexed { index, module ->
                 val moduleName = module.externalModuleName()
 
-                val exportedDeclarations = ExportModelGenerator(backendContext).let { module.files.flatMap { file -> it.generateExport(file) } }
+                val exportedDeclarations = ExportModelGenerator(backendContext, generateNamespacesForPackages = true).let { module.files.flatMap { file -> it.generateExport(file) } }
 
                 moduleName to generateWrappedModuleBody2(
                     listOf(module),
@@ -149,7 +147,7 @@ class IrModuleToJsTransformer(
             currentFile = null,
             currentFunction = null,
             staticContext = staticContext,
-            localNames = LocalNameGenerator(NameScope.EmptyScope)
+            localNames = LocalNameGenerator(NameTable())
         )
 
         val (importStatements, importedJsModules) =
@@ -162,7 +160,8 @@ class IrModuleToJsTransformer(
 
         val internalModuleName = JsName("_")
         val globalNames = NameTable<String>(namer.globalNames)
-        val exportStatements = ExportModelToJsStatements(internalModuleName, nameGenerator, { globalNames.declareFreshName(it, it)}).generateModuleExport(exportedModule)
+        val exportStatements = ExportModelToJsStatements(nameGenerator) { globalNames.declareFreshName(it, it) }
+            .generateModuleExport(exportedModule, internalModuleName)
 
         val (crossModuleImports, importedKotlinModules) = generateCrossModuleImports(nameGenerator, modules, dependencies, { JsName(sanitizeName(it)) })
         val crossModuleExports = generateCrossModuleExports(modules, refInfo, internalModuleName)
@@ -431,27 +430,6 @@ class IrModuleToJsTransformer(
         return Pair(importStatements, importedJsModules)
     }
 
-    private fun processClassModels(
-        classModelMap: Map<IrClassSymbol, JsIrClassModel>,
-        preDeclarationBlock: JsBlock,
-        postDeclarationBlock: JsBlock
-    ) {
-        val declarationHandler = object : DFS.AbstractNodeHandler<IrClassSymbol, Unit>() {
-            override fun result() {}
-            override fun afterChildren(current: IrClassSymbol) {
-                classModelMap[current]?.let {
-                    preDeclarationBlock.statements += it.preDeclarationBlock.statements
-                    postDeclarationBlock.statements += it.postDeclarationBlock.statements
-                }
-            }
-        }
-
-        DFS.dfs(
-            classModelMap.keys,
-            { klass -> classModelMap[klass]?.superClasses ?: emptyList() },
-            declarationHandler
-        )
-    }
 
     private fun MutableList<JsStatement>.startRegion(description: String = "") {
         if (generateRegionComments) {
@@ -479,3 +457,26 @@ class IrModuleToJsTransformer(
         endRegion()
     }
 }
+
+fun processClassModels(
+    classModelMap: Map<IrClassSymbol, JsIrClassModel>,
+    preDeclarationBlock: JsBlock,
+    postDeclarationBlock: JsBlock
+) {
+    val declarationHandler = object : DFS.AbstractNodeHandler<IrClassSymbol, Unit>() {
+        override fun result() {}
+        override fun afterChildren(current: IrClassSymbol) {
+            classModelMap[current]?.let {
+                preDeclarationBlock.statements += it.preDeclarationBlock.statements
+                postDeclarationBlock.statements += it.postDeclarationBlock.statements
+            }
+        }
+    }
+
+    DFS.dfs(
+        classModelMap.keys,
+        { klass -> classModelMap[klass]?.superClasses ?: emptyList() },
+        declarationHandler
+    )
+}
+

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/JsClassGenerator.kt

@@ -85,7 +85,7 @@ class JsClassGenerator(private val irClass: IrClass, val context: JsGenerationCo
                     }
                 }
                 is IrClass -> {
-                    classBlock.statements += JsClassGenerator(declaration, context).generate()
+//                    classBlock.statements += JsClassGenerator(declaration, context).generate()
                 }
                 is IrField -> {
                 }
@@ -208,9 +208,14 @@ class JsClassGenerator(private val irClass: IrClass, val context: JsGenerationCo
         val memberRef = JsNameRef(memberName, classPrototypeRef)
 
         if (declaration.isReal && declaration.body != null) {
-            val translatedFunction = declaration.accept(IrFunctionToJsTransformer(), context)
+            val translatedFunction: JsFunction = declaration.accept(IrFunctionToJsTransformer(), context)
             assert(!declaration.isStaticMethodOfClass)
 
+            if (irClass.isInterface) {
+                classModel.preDeclarationBlock.statements += translatedFunction.makeStmt()
+                return Pair(memberRef, null)
+            }
+
             return Pair(memberRef, translatedFunction)
         }
 
@@ -224,14 +229,19 @@ class JsClassGenerator(private val irClass: IrClass, val context: JsGenerationCo
                 ?.let {
                     val implClassDeclaration = it.parent as IrClass
 
-                    if (implClassDeclaration.shouldCopyFrom()) {
-                        val implMethodName = context.getNameForMemberFunction(it)
-                        val implClassName = context.getNameForClass(implClassDeclaration)
+                    if (implClassDeclaration.shouldCopyFrom() && it.body != null) {
+                        val reference = context.getNameForStaticDeclaration(it).makeRef()
+                        classModel.postDeclarationBlock.statements += jsAssignment(memberRef, reference).makeStmt()
+                    }
+                }
+            declaration.collectRealOverrides()
+                .find { it.modality != Modality.ABSTRACT }
+                ?.let {
+                    val implClassDeclaration = it.parent as IrClass
 
-                        val implClassPrototype = prototypeOf(implClassName.makeRef())
-                        val implMemberRef = JsNameRef(implMethodName, implClassPrototype)
-
-                        classModel.postDeclarationBlock.statements += jsAssignment(memberRef, implMemberRef).makeStmt()
+                    if (implClassDeclaration.shouldCopyFrom() && it.body != null) {
+                        val reference = context.getNameForStaticDeclaration(it).makeRef()
+                        classModel.postDeclarationBlock.statements += jsAssignment(memberRef, reference).makeStmt()
                     }
                 }
         }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/ModuleWrapperTranslation.kt

@@ -25,6 +25,7 @@ object ModuleWrapperTranslation {
             ModuleKind.COMMON_JS -> wrapCommonJs(function, importedModules, program)
             ModuleKind.UMD -> wrapUmd(moduleId, function, importedModules, program)
             ModuleKind.PLAIN -> wrapPlain(moduleId, function, importedModules, program)
+            ModuleKind.ES -> error("ES modules are not supported in legacy wrapper")
         }
     }
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/MultiModuleSupport.kt

@@ -116,94 +116,6 @@ fun buildCrossModuleReferenceInfo(modules: Iterable<IrModuleFragment>): CrossMod
     return CrossModuleReferenceInfoImpl(map)
 }
 
-fun breakCrossModuleFieldAccess(
-    context: JsIrBackendContext,
-    modules: Iterable<IrModuleFragment>
-) {
-    val fieldToGetter = mutableMapOf<IrField, IrSimpleFunction>()
-
-    fun IrField.getter(): IrSimpleFunction {
-        return fieldToGetter.getOrPut(this) {
-            val fieldName = name
-            val getter = context.irFactory.buildFun {
-                name = Name.identifier("get-$fieldName")
-                returnType = type
-            }
-            getter.body = factory.createBlockBody(
-                UNDEFINED_OFFSET, UNDEFINED_OFFSET, listOf(
-                    IrReturnImpl(
-                        UNDEFINED_OFFSET, UNDEFINED_OFFSET, type, getter.symbol,
-                        IrGetFieldImpl(UNDEFINED_OFFSET, UNDEFINED_OFFSET, symbol, type)
-                    )
-                )
-            )
-            getter.parent = parent
-            (parent as IrDeclarationContainer).declarations += getter
-
-            getter
-        }
-    }
-
-    val fieldToSetter = mutableMapOf<IrField, IrSimpleFunction>()
-
-    fun IrField.setter(): IrSimpleFunction {
-        return fieldToSetter.getOrPut(this) {
-            val fieldName = name
-            val setter = context.irFactory.buildFun {
-                name = Name.identifier("set-$fieldName")
-                returnType = context.irBuiltIns.unitType
-            }
-
-            val param = setter.addValueParameter("value", type)
-
-            setter.body = factory.createBlockBody(
-                UNDEFINED_OFFSET, UNDEFINED_OFFSET, listOf(
-                    IrSetFieldImpl(UNDEFINED_OFFSET, UNDEFINED_OFFSET, symbol, type).apply {
-                        value = IrGetValueImpl(UNDEFINED_OFFSET, UNDEFINED_OFFSET, param.symbol)
-                    }
-                )
-            )
-            setter.parent = parent
-            (parent as IrDeclarationContainer).declarations += setter
-
-            setter
-        }
-    }
-
-    modules.reversed().forEach { module ->
-
-        val moduleFields = module.files.flatMap { it.declarations.filterIsInstance<IrField>() }.toSet()
-
-        fun IrField.transformAccess(fn: IrField.() -> IrCall): IrCall? {
-            if (parent !is IrPackageFragment || isEffectivelyExternal() || this in moduleFields) return null
-            return fn()
-        }
-
-        module.transformChildrenVoid(object : IrElementTransformerVoid() {
-
-            override fun visitGetField(expression: IrGetField): IrExpression {
-                expression.transformChildrenVoid(this)
-
-                return expression.symbol.owner.transformAccess {
-                    val getter = getter()
-                    IrCallImpl(UNDEFINED_OFFSET, UNDEFINED_OFFSET, getter.returnType, getter.symbol, getter.typeParameters.size, getter.valueParameters.size)
-                } ?: expression
-            }
-
-            override fun visitSetField(expression: IrSetField): IrExpression {
-                expression.transformChildrenVoid(this)
-
-                return expression.symbol.owner.transformAccess {
-                    val setter = setter()
-                    IrCallImpl(UNDEFINED_OFFSET, UNDEFINED_OFFSET, setter.returnType, setter.symbol, setter.typeParameters.size, setter.valueParameters.size).apply {
-                        putValueArgument(0, expression.value)
-                    }
-                } ?: expression
-            }
-        })
-    }
-}
-
 val IrModuleFragment.safeName: String
     get() {
         var result = name.asString()

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/jsAstUtils.kt

@@ -11,6 +11,7 @@ import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.backend.js.JsStatementOrigins
 import org.jetbrains.kotlin.ir.backend.js.utils.*
+import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.declarations.IrSimpleFunction
 import org.jetbrains.kotlin.ir.expressions.*
@@ -127,17 +128,22 @@ fun translateCall(
     }
 
     expression.superQualifierSymbol?.let { superQualifier ->
-        val (target, klass) = if (superQualifier.owner.isInterface) {
+        val (target: IrSimpleFunction, klass: IrClass) = if (superQualifier.owner.isInterface) {
             val impl = function.resolveFakeOverride()!!
             Pair(impl, impl.parentAsClass)
         } else {
             Pair(function, superQualifier.owner)
         }
 
-        val qualifierName = context.getNameForClass(klass).makeRef()
-        val targetName = context.getNameForMemberFunction(target)
-        val qPrototype = JsNameRef(targetName, prototypeOf(qualifierName))
-        val callRef = JsNameRef(Namer.CALL_FUNCTION, qPrototype)
+        val callRef = if (klass.isInterface && target.body != null) {
+            JsNameRef(Namer.CALL_FUNCTION, JsNameRef(context.getNameForStaticDeclaration(target)))
+        } else {
+            val qualifierName = context.getNameForClass(klass).makeRef()
+            val targetName = context.getNameForMemberFunction(target)
+            val qPrototype = JsNameRef(targetName, prototypeOf(qualifierName))
+            JsNameRef(Namer.CALL_FUNCTION, qPrototype)
+        }
+
         return JsInvocation(callRef, jsDispatchReceiver?.let { receiver -> listOf(receiver) + arguments } ?: arguments)
     }
 
@@ -193,20 +199,15 @@ fun translateCall(
                     "VarargIIFE"
                 )
 
-                val iifeFunHasContext = (jsDispatchReceiver as? JsNameRef)?.qualifier is JsThisRef
-                if (iifeFunHasContext) {
-                    JsInvocation(
-                        // Create scope for temporary variable holding dispatch receiver
-                        // It is used both during method reference and passing `this` value to `apply` function.
-                        JsNameRef(
-                            "call",
-                            iifeFun
-                        ),
-                        JsThisRef()
-                    )
-                } else {
-                    JsInvocation(iifeFun)
-                }
+                JsInvocation(
+                    // Create scope for temporary variable holding dispatch receiver
+                    // It is used both during method reference and passing `this` value to `apply` function.
+                    JsNameRef(
+                        "call",
+                        iifeFun
+                    ),
+                    JsThisRef()
+                )
             }
         } else {
             if (argumentsAsSingleArray is JsArrayLiteral) {

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/JsStaticContext.kt

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.ir.backend.js.utils
 import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
 import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsIntrinsicTransformers
 import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.JsIrClassModel
+import org.jetbrains.kotlin.ir.declarations.IrDeclaration
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.js.backend.ast.JsGlobalBlock
 import org.jetbrains.kotlin.js.config.JSConfigurationKeys
@@ -16,7 +17,7 @@ import org.jetbrains.kotlin.js.config.JSConfigurationKeys
 class JsStaticContext(
     val backendContext: JsIrBackendContext,
     private val irNamer: IrNamer,
-    val globalNameScope: NameScope,
+    val globalNameScope: NameTable<IrDeclaration>,
 ) : IrNamer by irNamer {
     val intrinsics = JsIntrinsicTransformers(backendContext)
     val classModels = mutableMapOf<IrClassSymbol, JsIrClassModel>()

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NameTables.kt

@@ -16,6 +16,7 @@ import org.jetbrains.kotlin.ir.types.isUnit
 import org.jetbrains.kotlin.ir.util.file
 import org.jetbrains.kotlin.ir.util.fqNameWhenAvailable
 import org.jetbrains.kotlin.ir.util.isEffectivelyExternal
+import org.jetbrains.kotlin.ir.util.isInterface
 import org.jetbrains.kotlin.ir.util.render
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
@@ -32,7 +33,12 @@ import kotlin.math.abs
 private fun <T> mapToKey(declaration: T): String {
     return with(JsManglerIr) {
         if (declaration is IrDeclaration) {
-            declaration.hashedMangle(compatibleMode = false).toString()
+            try {
+                declaration.hashedMangle(compatibleMode = false).toString()
+            } catch (e: Throwable) {
+                // FIXME: We can't mangle some local declarations. But
+                "wrong_key"
+            }
         } else if (declaration is String) {
             declaration.hashMangle.toString()
         } else {
@@ -118,6 +124,7 @@ fun jsFunctionSignature(declaration: IrFunction, context: JsIrBackendContext?):
     }
 
     val nameBuilder = StringBuilder()
+    nameBuilder.append(declarationName)
 
     // TODO should we skip type parameters and use upper bound of type parameter when print type of value parameters?
     declaration.typeParameters.ifNotEmpty {
@@ -202,6 +209,11 @@ class NameTables(
             when (memberDecl) {
                 is IrField ->
                     generateNameForMemberField(memberDecl)
+                is IrSimpleFunction -> {
+                    if (declaration.isInterface && memberDecl.body != null) {
+                        globalNames.declareFreshName(memberDecl, memberDecl.name.asString())
+                    }
+                }
             }
         }
     }
@@ -299,8 +311,7 @@ class NameTables(
 
 }
 
-class LocalNameGenerator(parentScope: NameScope) : IrElementVisitorVoid {
-    val variableNames = NameTable<IrDeclarationWithName>(parentScope)
+class LocalNameGenerator(val variableNames: NameTable<IrDeclaration>) : IrElementVisitorVoid {
     val localLoopNames = NameTable<IrLoop>()
     val localReturnableBlockNames = NameTable<IrReturnableBlock>()
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/NewNamer.kt

@@ -0,0 +1,207 @@
+/*
+ * 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.ir.backend.js.utils
+
+import org.jetbrains.kotlin.ir.IrElement
+import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
+import org.jetbrains.kotlin.ir.backend.js.codegen.IrToJs
+import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.expressions.IrDeclarationReference
+import org.jetbrains.kotlin.ir.util.*
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
+import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
+import org.jetbrains.kotlin.js.backend.ast.JsImport
+import org.jetbrains.kotlin.js.backend.ast.JsName
+
+class StaticDeclarationNumerator {
+    var currentNumber = 0
+    val numeration = mutableMapOf<IrDeclaration, Int>()
+
+    fun add(moduleFragment: IrModuleFragment) {
+        moduleFragment.files.forEach { add(it) }
+    }
+
+    fun add(declaration: IrDeclaration) {
+        // TODO: We should not visit declarations multiple times.
+        //       Investigate enum tests in dce-driven mode.
+        if (declaration !in numeration) {
+            numeration[declaration] = currentNumber
+            currentNumber++
+        }
+    }
+
+    fun add(packageFragment: IrPackageFragment) {
+        packageFragment.acceptChildrenVoid(object : IrElementVisitorVoid {
+            override fun visitElement(element: IrElement) {
+                element.acceptChildrenVoid(this)
+            }
+
+            override fun visitDeclaration(declaration: IrDeclarationBase) {
+                if (declaration !is IrVariable) {
+                    add(declaration)
+                }
+                super.visitDeclaration(declaration)
+            }
+        })
+    }
+}
+
+class NewStableStaticNamesCollectorVisitor(val needToCollectReferences: Boolean) : IrElementVisitorVoid {
+    val collectedStableNames = mutableSetOf<String>()
+
+    init {
+        collectedStableNames.addAll(RESERVED_IDENTIFIERS)
+        collectedStableNames.add(Namer.IMPLICIT_RECEIVER_NAME)
+    }
+
+    private fun IrDeclaration.collectStableName() {
+        collectedStableNames += stableNameForExternalDeclaration(this) ?: return
+    }
+
+    override fun visitElement(element: IrElement) {
+        element.acceptChildrenVoid(this)
+    }
+
+    override fun visitDeclaration(declaration: IrDeclarationBase) {
+        super.visitDeclaration(declaration)
+        declaration.collectStableName()
+    }
+
+    override fun visitDeclarationReference(expression: IrDeclarationReference) {
+        super.visitDeclarationReference(expression)
+        if (needToCollectReferences) {
+            val declaration = expression.symbol.owner as? IrDeclaration
+            declaration?.collectStableName()
+        }
+    }
+}
+
+class NewNamerImpl(
+    val context: JsIrBackendContext,
+    val unit: IrToJs.CodegenUnit,
+    val exportId: (IrDeclarationWithName) -> String,
+    val stableNames: Set<String>,
+) : IrNamerBase() {
+    val staticNames = NameTable<IrDeclaration>(
+        reserved = stableNames.toMutableSet()
+    )
+    val internalImports = mutableMapOf<String, JsImport>()
+
+    override fun getNameForMemberFunction(function: IrSimpleFunction): JsName {
+        require(function.dispatchReceiverParameter != null)
+        val name = jsFunctionSignature(function, context)
+        return name.toJsName()
+    }
+
+    override fun getNameForMemberField(field: IrField): JsName {
+        val fieldName = sanitizeName(
+            try {
+                exportId(field)
+            } catch (e: IllegalStateException) {
+                // TODO: Fix DCE with inline classes and remove this hack
+                field.name.asString() + "_LIKELY_ELIMINATED_BY_DCE"
+            }
+        )
+        // TODO: Webpack not minimize member names, it is long name, which is not minimized, so it affects final JS bundle size
+        // Use shorter names
+        return JsName("f_$fieldName")
+    }
+
+    override fun getNameForStaticDeclaration(declaration: IrDeclarationWithName): JsName {
+        staticNames.names[declaration]?.let { return JsName(it) }
+
+        fun registerImport(moduleId: String, importedName: String) {
+            val fullModuleId = if (moduleId.startsWith(".")) {
+                unit.pathToKotlinModulesRoot + moduleId
+            } else {
+                // TODO: Do we cover this path in tests?
+                moduleId
+            }
+
+            val import = internalImports.getOrPut(fullModuleId) {
+                JsImport(fullModuleId)
+            }
+            import.elements += JsImport.Element(importedName, staticNames.names[declaration]!!)
+        }
+
+        if (declaration.isEffectivelyExternal()) {
+            val jsModule: String? = declaration.getJsModule()
+            val maybeParentFile: IrFile? = declaration.parent as? IrFile
+            val fileJsModule: String? = maybeParentFile?.getJsModule()
+            val jsQualifier: String? = maybeParentFile?.getJsQualifier()
+
+            when {
+                jsModule != null -> {
+                    // TODO: Support jsQualifier
+                    staticNames.declareFreshName(declaration, declaration.name.asString())
+                    registerImport(jsModule, "default")
+                }
+
+                fileJsModule != null -> {
+                    // TODO: Support jsQualifier
+                    staticNames.declareFreshName(declaration, declaration.name.asString())
+                    registerImport(fileJsModule, declaration.getJsNameOrKotlinName().identifier)
+                }
+
+                else -> {
+                    var name = declaration.getJsNameOrKotlinName().identifier
+                    if (jsQualifier != null)
+                        name = "$jsQualifier.$name"
+
+                    staticNames.declareStableName(declaration, name)
+                }
+            }
+
+
+        } else {  // Non-external declaration
+            staticNames.declareFreshName(declaration, declaration.name.asString())
+            val unitReference = unit.referenceCodegenUnitOfDeclaration(declaration)
+            if (unitReference is IrToJs.OtherUnitReference) {
+                registerImport(unitReference.importPath, exportId(declaration))
+            }
+        }
+
+        return JsName(staticNames.names[declaration]!!)
+    }
+}
+
+// TODO: Cache?
+private fun stableNameForExternalDeclaration(declaration: IrDeclaration): String? {
+    if (declaration !is IrDeclarationWithName ||
+        !declaration.hasStaticDispatch() ||
+        !declaration.isEffectivelyExternal() ||
+        declaration.isPropertyAccessor ||
+        declaration.isPropertyField
+    ) {
+        return null
+    }
+
+    if (declaration is IrConstructor) {
+        return stableNameForExternalDeclaration(declaration.parentAsClass)
+    }
+
+    val importedFromModuleOnly =
+        declaration.getJsModule() != null && !declaration.isJsNonModule()
+
+    val jsName = declaration.getJsName()
+
+    val jsQualifier = declaration.fileOrNull?.getJsQualifier()
+
+    return when {
+        importedFromModuleOnly ->
+            null
+
+        jsQualifier != null ->
+            jsQualifier.split('1')[0]
+
+        jsName != null ->
+            jsName
+
+        else ->
+            declaration.name.identifier
+    }
+}
+

compiler/testData/cli/js/jsExtraHelp.out

@@ -20,6 +20,7 @@ where advanced options include:
                              Enable runtime diagnostics when performing DCE instead of removing declarations
   -Xir-module-name=<name>    Specify a compilation module name for IR backend
   -Xir-only                  Disables pre-IR backend
+  -Xir-per-file              Splits generated .js per-file
   -Xir-per-module            Splits generated .js per-module
   -Xir-per-module-output-name Adds a custom output name to the splitted js files
   -Xir-produce-js            Generates JS file using IR backend. Also disables pre-IR backend

compiler/testData/codegen/box/enum/kt18731_2.kt

@@ -1,3 +1,4 @@
+// SKIP_DCE_DRIVEN
 
 enum class Bar {
     ONE {

compiler/testData/codegen/box/properties/lazyInitializationPure.kt

@@ -1,36 +0,0 @@
-// TARGET_BACKEND: JS_IR
-// PROPERTY_LAZY_INITIALIZATION
-
-// FILE: A.kt
-
-val a = "A"
-
-// FILE: B.kt
-val b = "B".let {
-    it + "B"
-}
-
-val c = b
-
-// FILE: C.kt
-val d = "D".let {
-    it + "D"
-}
-
-val e = d
-
-// FILE: main.kt
-
-fun box(): String {
-    // Get only e to initialize all properties in file
-    e
-    return if (
-        js("a") === "A" &&
-        js("typeof b") == "undefined" &&
-        js("typeof c") == "undefined" &&
-        js("d") === "DD" &&
-        js("e") === "DD"
-    )
-        "OK"
-    else "a = ${js("a")}; typeof b = ${js("typeof b")}; typeof c = ${js("typeof c")}; d = ${js("d")}; e = ${js("e")}"
-}

compiler/testData/codegen/box/properties/lazyInitializationThroughTopFun.kt

@@ -3,7 +3,10 @@
 // PROPERTY_LAZY_INITIALIZATION
 
 // FILE: A.kt
+var result: String? = null
+
 val a = "a".let {
+    result = "OK"
     it + "a"
 }
 
@@ -13,5 +16,5 @@ fun foo() =
 // FILE: main.kt
 fun box(): String {
     val foo = foo()
-    return if (js("typeof a") == "string" && js("a") == "aa") "OK" else "fail"
+    return result!!
 }

compiler/testData/codegen/box/properties/noInitializationLazilyOnNonPropertiesCall.kt

@@ -5,6 +5,7 @@
 
 // FILE: A.kt
 val a1 = "a".let {
+    throw Error()
     it + "a"
 }
 
@@ -39,5 +40,5 @@ fun box(): String {
     C.values()
     C.valueOf("OK")
     val baz = b
-    return if (js("typeof a1") == "undefined") "OK" else "fail"
+    return "OK"
 }

compiler/testData/codegen/box/regressions/kt10143.kt

@@ -1,3 +1,5 @@
+// TODO: Investigate ES modules issue
+
 // FILE: Outer.kt
 
 package another

js/js.ast/src/org/jetbrains/kotlin/js/backend/JsToStringGenerationVisitor.java

@@ -1173,6 +1173,69 @@ public class JsToStringGenerationVisitor extends JsVisitor {
         }
     }
 
+    @Override
+    public void visitExport(@NotNull JsExport export) {
+        p.print("export");
+        space();
+        JsExport.Subject subject = export.getSubject();
+
+        if (subject instanceof JsExport.Subject.All) {
+            p.print("*");
+        } else if (subject instanceof JsExport.Subject.Elements) {
+            blockOpen();
+            List<JsExport.Element> elements = ((JsExport.Subject.Elements) subject).getElements();
+            for (JsExport.Element element : elements) {
+                nameDef(element.getName());
+                JsName alias = element.getAlias();
+                if (alias != null) {
+                    p.print(" as ");
+                    nameDef(alias);
+                }
+                p.print(',');
+                p.newline();
+            }
+            p.indentOut();
+            p.print('}');
+        }
+
+        if (export.getFromModule() != null) {
+            p.print(" from ");
+            p.print(javaScriptString(export.getFromModule()));
+        }
+        needSemi = true;
+    }
+
+    @Override
+    public void visitImport(@NotNull JsImport jsImport) {
+        p.print("import {");
+        boolean isMultiline = jsImport.getElements().size() > 1;
+        p.indentIn();
+        if (isMultiline)
+            newlineOpt();
+        else
+            space();
+
+        for (JsImport.Element element : jsImport.getElements()) {
+            nameDef(element.getName());
+            JsName alias = element.getAlias();
+            if (alias != null) {
+                p.print(" as ");
+                nameDef(alias);
+            }
+
+            if (isMultiline) {
+                p.print(',');
+                newlineOpt();
+            } else {
+                space();
+            }
+        }
+        p.indentOut();
+        p.print("} from ");
+        p.print(javaScriptString(jsImport.getModule()));
+    }
+
+
     private void newline() {
         p.newline();
         sourceLocationConsumer.newLine();

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsExport.kt

@@ -0,0 +1,40 @@
+/*
+ * 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.js.backend.ast
+
+class JsExport(
+    val subject: Subject,
+    val fromModule: String? = null,
+) : SourceInfoAwareJsNode(), JsStatement {
+
+    constructor(element: Element) : this(Subject.Elements(listOf(element)))
+    constructor(name: JsName, alias: JsName? = null) : this(Element(name, alias))
+
+    sealed class Subject {
+        class Elements(val elements: List<Element>) : Subject()
+        object All : Subject()
+    }
+
+    class Element(
+        val name: JsName,
+        val alias: JsName?
+    )
+
+    override fun accept(visitor: JsVisitor) {
+        visitor.visitExport(this)
+    }
+
+    override fun acceptChildren(visitor: JsVisitor) {
+    }
+
+    override fun deepCopy(): JsStatement =
+        JsExport(subject, fromModule)
+
+    override fun traverse(v: JsVisitorWithContext, ctx: JsContext<*>) {
+        v.visit(this, ctx)
+        v.endVisit(this, ctx)
+    }
+}

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsImport.kt

@@ -0,0 +1,34 @@
+/*
+ * 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.js.backend.ast
+
+class JsImport(
+    val module: String,
+    val elements: MutableList<Element> = mutableListOf(),
+) : SourceInfoAwareJsNode(), JsStatement {
+
+    class Element(
+        val name: JsName,
+        val alias: JsName?
+    ) {
+        constructor(name: String, alias: String?) : this(JsName(name), alias?.let { JsName(it) })
+    }
+
+    override fun accept(visitor: JsVisitor) {
+        visitor.visitImport(this)
+    }
+
+    override fun acceptChildren(visitor: JsVisitor) {
+    }
+
+    override fun deepCopy(): JsStatement =
+        JsImport(module, elements.map { it }.toMutableList())
+
+    override fun traverse(v: JsVisitorWithContext, ctx: JsContext<*>) {
+        v.visit(this, ctx)
+        v.endVisit(this, ctx)
+    }
+}

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsVisitor.kt

@@ -165,6 +165,12 @@ abstract class JsVisitor {
     open fun visitSingleLineComment(comment: JsSingleLineComment): Unit =
             visitElement(comment)
 
+    open fun visitExport(export: JsExport): Unit =
+            visitElement(export)
+
+    open fun visitImport(import: JsImport): Unit =
+        visitElement(import)
+
     protected open fun visitElement(node: JsNode) {
     }
 }

js/js.ast/src/org/jetbrains/kotlin/js/backend/ast/JsVisitorWithContext.java

@@ -214,6 +214,12 @@ public abstract class JsVisitorWithContext {
     public void endVisit(@NotNull JsSingleLineComment x, @NotNull JsContext ctx) {
     }
 
+    public void endVisit(@NotNull JsExport x, @NotNull JsContext ctx) {
+    }
+
+    public void endVisit(@NotNull JsImport x, @NotNull JsContext ctx) {
+    }
+
     public void endVisit(@NotNull JsWhile x, @NotNull JsContext ctx) {
         endVisit((JsLoop) x, ctx);
     }
@@ -398,6 +404,14 @@ public abstract class JsVisitorWithContext {
         return true;
     }
 
+    public boolean visit(@NotNull JsExport x, @NotNull JsContext ctx) {
+        return true;
+    }
+
+    public boolean visit(@NotNull JsImport x, @NotNull JsContext ctx) {
+        return true;
+    }
+
     protected abstract  <T extends JsNode> T doAccept(T node);
 
     protected abstract JsExpression doAcceptLvalue(JsExpression expr);

js/js.serializer/src/org/jetbrains/kotlin/serialization/js/KotlinJavascriptSerializationUtil.kt

@@ -124,6 +124,7 @@ object KotlinJavascriptSerializationUtil {
                 ModuleKind.AMD -> JsProtoBuf.Library.Kind.AMD
                 ModuleKind.COMMON_JS -> JsProtoBuf.Library.Kind.COMMON_JS
                 ModuleKind.UMD -> JsProtoBuf.Library.Kind.UMD
+                ModuleKind.ES -> error("Es modules serialization")
             }
             if (builder.kind != moduleProtoKind) {
                 builder.kind = moduleProtoKind

js/js.serializer/src/org/jetbrains/kotlin/serialization/js/ModuleKind.java

@@ -22,5 +22,6 @@ public enum ModuleKind {
     PLAIN,
     AMD,
     COMMON_JS,
-    UMD
+    UMD,
+    ES
 }

js/js.tests/build.gradle.kts

@@ -257,6 +257,8 @@ projectTest(parallel = true) {
 }
 
 projectTest("jsTest", true) {
+    // PIR temporary disabled
+    systemProperty("kotlin.js.ir.pir", "false")
     setUpJsBoxTests(jsEnabled = true, jsIrEnabled = false)
 }
 

js/js.tests/test/org/jetbrains/kotlin/generators/tests/GenerateJsTests.kt

@@ -47,11 +47,6 @@ fun main(args: Array<String>) {
                 model("typescript-export/", pattern = "^([^_](.+))\\.kt$", targetBackend = TargetBackend.JS_IR_ES6)
             }
 
-            testClass<AbstractLegacyJsTypeScriptExportTest> {
-                model("typescript-export/", pattern = "^([^_](.+))\\.kt$", targetBackend = TargetBackend.JS)
-            }
-
-
             testClass<AbstractSourceMapGenerationSmokeTest> {
                 model("sourcemap/", pattern = "^([^_](.+))\\.kt$", targetBackend = TargetBackend.JS)
             }

js/js.tests/test/org/jetbrains/kotlin/js/test/BasicBoxTest.kt

@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.idea.KotlinFileType
 import org.jetbrains.kotlin.incremental.js.IncrementalDataProviderImpl
 import org.jetbrains.kotlin.incremental.js.IncrementalResultsConsumerImpl
 import org.jetbrains.kotlin.incremental.js.TranslationResultValue
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity
 import org.jetbrains.kotlin.ir.backend.js.ic.ICCache
 import org.jetbrains.kotlin.js.JavaScript
 import org.jetbrains.kotlin.js.backend.JsToStringGenerationVisitor
@@ -46,6 +47,7 @@ import org.jetbrains.kotlin.js.parser.sourcemaps.SourceMapParser
 import org.jetbrains.kotlin.js.parser.sourcemaps.SourceMapSuccess
 import org.jetbrains.kotlin.js.sourceMap.SourceFilePathResolver
 import org.jetbrains.kotlin.js.sourceMap.SourceMap3Builder
+import org.jetbrains.kotlin.js.test.engines.ExternalTool
 import org.jetbrains.kotlin.js.sourceMap.SourceMapBuilderConsumer
 import org.jetbrains.kotlin.js.test.utils.*
 import org.jetbrains.kotlin.js.util.TextOutputImpl
@@ -153,7 +155,17 @@ abstract class BasicBoxTest(
             if (errorPolicyMatcher.find()) ErrorTolerancePolicy.resolvePolicy(errorPolicyMatcher.group(1)) else ErrorTolerancePolicy.DEFAULT
 
         val skipDceDriven = SKIP_DCE_DRIVEN.matcher(fileContent).find()
+        val esModules = ES_MODULES.matcher(fileContent).find()
+
         val splitPerModule = SPLIT_PER_MODULE.matcher(fileContent).find()
+        val splitPerFile = SPLIT_PER_FILE.matcher(fileContent).find()
+
+        val granularity = when {
+            splitPerModule -> JsGenerationGranularity.PER_MODULE
+            splitPerFile -> JsGenerationGranularity.PER_FILE
+            else -> JsGenerationGranularity.WHOLE_PROGRAM
+        }
+
         val skipMangleVerification = SKIP_MANGLE_VERIFICATION.matcher(fileContent).find()
 
         val safeExternalBoolean = SAFE_EXTERNAL_BOOLEAN.matcher(fileContent).find()
@@ -196,6 +208,12 @@ abstract class BasicBoxTest(
             val mainModule = modules[mainModuleName] ?: error("No module with name \"$mainModuleName\"")
             val icCache = mutableMapOf<String, TestModuleCache>()
 
+            if (esModules) {
+                modules.forEach { _, m -> m.moduleKind = ModuleKind.ES }
+            }
+
+            val customTestModule: String? = inputFiles.find { it.testEntryEsModule }?.let { File(it.fileName).readText() }
+
             val generatedJsFiles = orderedModules.asReversed().mapNotNull { module ->
                 val dependencies = module.dependenciesSymbols.map { modules[it]?.outputFileName(outputDir) + ".meta.js" }
                 val allDependencies = module.allTransitiveDependencies().map { modules[it]?.outputFileName(outputDir) + ".meta.js" }
@@ -229,7 +247,8 @@ abstract class BasicBoxTest(
                     isMainModule,
                     expectActualLinker,
                     skipDceDriven,
-                    splitPerModule,
+                    esModules,
+                    granularity,
                     errorPolicy,
                     propertyLazyInitialization = true,
                     safeExternalBoolean,
@@ -237,7 +256,8 @@ abstract class BasicBoxTest(
                     skipMangleVerification,
                     abiVersion,
                     checkIC,
-                    icCache
+                    icCache,
+                    customTestModule,
                 )
 
                 when {
@@ -279,6 +299,7 @@ abstract class BasicBoxTest(
             }
 
             val additionalFiles = mutableListOf<String>()
+            val moduleEmulationFiles = mutableListOf<String>()
 
             val moduleKindMatcher = MODULE_KIND_PATTERN.matcher(fileContent)
             val moduleKind = if (moduleKindMatcher.find()) ModuleKind.valueOf(moduleKindMatcher.group(1)) else ModuleKind.PLAIN
@@ -286,7 +307,7 @@ abstract class BasicBoxTest(
             val withModuleSystem = moduleKind != ModuleKind.PLAIN && !NO_MODULE_SYSTEM_PATTERN.matcher(fileContent).find()
 
             if (withModuleSystem) {
-                additionalFiles += MODULE_EMULATION_FILE
+                moduleEmulationFiles += MODULE_EMULATION_FILE
             }
 
             val additionalJsFile = filePath.removeSuffix("." + KotlinFileType.EXTENSION) + JavaScript.DOT_EXTENSION
@@ -294,6 +315,63 @@ abstract class BasicBoxTest(
                 additionalFiles += additionalJsFile
             }
 
+            if (esModules) {
+                val additionalMainJsFile =
+                    (filePath.removeSuffix("." + KotlinFileType.EXTENSION) + "__main.js").takeIf { File(it).exists() }
+
+                val maybeAdditionalMjsFile: String? =
+                    (filePath.removeSuffix("." + KotlinFileType.EXTENSION) + ".mjs")
+                        .takeIf { File(it).exists() }
+
+                val allMjsFiles: List<String> =
+                    inputFiles.filter { it.fileName.endsWith(".mjs") }.map { it.fileName } + listOfNotNull(maybeAdditionalMjsFile)
+
+                val allNonEsModuleFiles: List<String> =
+                    additionalFiles + inputJsFilesBefore + globalCommonFiles + localCommonFiles + additionalCommonFiles
+
+                fun runIrEsmTests(testOutputDir: File) {
+                    val esmOutputDir = testOutputDir.esModulesSubDir
+
+                    // Copy __main file if present
+                    if (additionalMainJsFile != null) {
+                        val newFileName = File(esmOutputDir, "test.mjs")
+                        newFileName.delete()
+                        File(additionalMainJsFile).copyTo(newFileName)
+                    }
+
+                    // Copy all .mjs files into generated directory
+                    allMjsFiles.forEach { mjsFile ->
+                        val outFile = File(esmOutputDir, File(mjsFile).name)
+                        File(mjsFile).copyTo(outFile)
+                    }
+
+                    val perFileEsModuleFile = "$esmOutputDir/test.mjs"
+                    v8tool.run(*allNonEsModuleFiles.toTypedArray(), perFileEsModuleFile, *inputJsFilesAfter.toTypedArray())
+                }
+
+                fun File.getTestDir(): File =
+                    File(generatedJsFiles.single().first.replace(outputDir.absolutePath, this.absolutePath))
+
+                if (!skipRegularMode) {
+                    runIrEsmTests(outputDir.getTestDir())
+
+                    if (runIrDce) {
+                        runIrEsmTests(dceOutputDir.getTestDir())
+                    }
+                }
+
+                if (runIrPir && !skipDceDriven) {
+                    runIrEsmTests(pirOutputDir.getTestDir())
+                }
+            }
+
+            if (esModules)
+                return
+
+            // Old systems tests
+
+            additionalFiles.addAll(0, moduleEmulationFiles)
+
             val additionalMainFiles = mutableListOf<String>()
             val additionalMainJsFile = filePath.removeSuffix("." + KotlinFileType.EXTENSION) + "__main.js"
             if (File(additionalMainJsFile).exists()) {
@@ -318,7 +396,6 @@ abstract class BasicBoxTest(
             } +
                     globalCommonFiles + localCommonFiles + additionalCommonFiles + additionalMainFiles + inputJsFilesAfter
 
-
             val dontRunGeneratedCode =
                 InTextDirectivesUtils.dontRunGeneratedCode(targetBackend, file)
 
@@ -501,7 +578,8 @@ abstract class BasicBoxTest(
         isMainModule: Boolean,
         expectActualLinker: Boolean,
         skipDceDriven: Boolean,
-        splitPerModule: Boolean,
+        esModules: Boolean,
+        granularity: JsGenerationGranularity,
         errorIgnorancePolicy: ErrorTolerancePolicy,
         propertyLazyInitialization: Boolean,
         safeExternalBoolean: Boolean,
@@ -509,7 +587,8 @@ abstract class BasicBoxTest(
         skipMangleVerification: Boolean,
         abiVersion: KotlinAbiVersion,
         checkIC: Boolean,
-        icCache: MutableMap<String, TestModuleCache>
+        icCache: MutableMap<String, TestModuleCache>,
+        customTestModule: String?,
     ) {
         val kotlinFiles = module.files.filter { it.fileName.endsWith(".kt") }
         val testFiles = kotlinFiles.map { it.fileName }
@@ -558,7 +637,8 @@ abstract class BasicBoxTest(
             needsFullIrRuntime,
             isMainModule,
             skipDceDriven,
-            splitPerModule,
+            esModules,
+            granularity,
             propertyLazyInitialization,
             safeExternalBoolean,
             safeExternalBooleanDiagnostic,
@@ -566,7 +646,8 @@ abstract class BasicBoxTest(
             abiVersion,
             checkIC,
             recompile = false,
-            icCache
+            icCache,
+            customTestModule,
         )
 
         if (incrementalCompilationChecksEnabled && module.hasFilesToRecompile) {
@@ -661,7 +742,8 @@ abstract class BasicBoxTest(
             needsFullIrRuntime,
             isMainModule = false,
             skipDceDriven = true,
-            splitPerModule = false,
+            esModules = false,
+            granularity = JsGenerationGranularity.WHOLE_PROGRAM,
             propertyLazyInitialization = true,
             safeExternalBoolean = false,
             safeExternalBooleanDiagnostic = null,
@@ -669,7 +751,8 @@ abstract class BasicBoxTest(
             abiVersion = KotlinAbiVersion.CURRENT,
             incrementalCompilation = true,
             recompile = true,
-            mutableMapOf()
+            mutableMapOf(),
+            customTestModule = null,
         )
 
         val originalOutput = FileUtil.loadFile(outputFile)
@@ -747,7 +830,8 @@ abstract class BasicBoxTest(
         needsFullIrRuntime: Boolean,
         isMainModule: Boolean,
         skipDceDriven: Boolean,
-        splitPerModule: Boolean,
+        esModules: Boolean,
+        granularity: JsGenerationGranularity,
         propertyLazyInitialization: Boolean,
         safeExternalBoolean: Boolean,
         safeExternalBooleanDiagnostic: RuntimeDiagnostic?,
@@ -755,7 +839,8 @@ abstract class BasicBoxTest(
         abiVersion: KotlinAbiVersion,
         incrementalCompilation: Boolean,
         recompile: Boolean,
-        icCache: MutableMap<String, TestModuleCache>
+        icCache: MutableMap<String, TestModuleCache>,
+        customTestModule: String?,
     ) {
         val translator = K2JSTranslator(config, false)
         val translationResult = translator.translateUnits(ExceptionThrowingReporter, units, mainCallParameters)
@@ -813,6 +898,8 @@ abstract class BasicBoxTest(
                         "$content\n"
 
             ModuleKind.PLAIN -> content
+
+            ModuleKind.ES -> error("Module emulation markers are not supported for ES modules")
         }
     }
 
@@ -1082,7 +1169,8 @@ abstract class BasicBoxTest(
                 temporaryFile.absolutePath,
                 currentModule,
                 recompile = RECOMPILE_PATTERN.matcher(text).find(),
-                packageName = ktFile.packageFqName.asString()
+                packageName = ktFile.packageFqName.asString(),
+                testEntryEsModule = ENTRY_ES_MODULE.matcher(text).find(),
             )
         }
 
@@ -1099,7 +1187,7 @@ abstract class BasicBoxTest(
         }
     }
 
-    protected class TestFile(val fileName: String, val module: TestModule, val recompile: Boolean, val packageName: String) {
+    protected class TestFile(val fileName: String, val module: TestModule, val recompile: Boolean, val packageName: String, val testEntryEsModule: Boolean) {
         init {
             module.files += this
         }
@@ -1149,6 +1237,8 @@ abstract class BasicBoxTest(
         // Run top level box function
         private val RUN_PLAIN_BOX_FUNCTION = Pattern.compile("^// *RUN_PLAIN_BOX_FUNCTION", Pattern.MULTILINE)
 
+        private val ENTRY_ES_MODULE = Pattern.compile("^// *ENTRY_ES_MODULE", Pattern.MULTILINE)
+
         private val NO_INLINE_PATTERN = Pattern.compile("^// *NO_INLINE *$", Pattern.MULTILINE)
         private val SKIP_NODE_JS = Pattern.compile("^// *SKIP_NODE_JS *$", Pattern.MULTILINE)
         private val SKIP_MINIFICATION = Pattern.compile("^// *SKIP_MINIFICATION *$", Pattern.MULTILINE)
@@ -1163,7 +1253,10 @@ abstract class BasicBoxTest(
         private val WITH_STDLIB = Pattern.compile("^// *WITH_STDLIB *\$", Pattern.MULTILINE)
         private val EXPECT_ACTUAL_LINKER = Pattern.compile("^// EXPECT_ACTUAL_LINKER *$", Pattern.MULTILINE)
         private val SKIP_DCE_DRIVEN = Pattern.compile("^// *SKIP_DCE_DRIVEN *$", Pattern.MULTILINE)
+        private val ES_MODULES = Pattern.compile("^// *ES_MODULES *$", Pattern.MULTILINE)
+
         private val SPLIT_PER_MODULE = Pattern.compile("^// *SPLIT_PER_MODULE *$", Pattern.MULTILINE)
+        private val SPLIT_PER_FILE = Pattern.compile("^// *SPLIT_PER_FILE *$", Pattern.MULTILINE)
         private val SKIP_MANGLE_VERIFICATION = Pattern.compile("^// *SKIP_MANGLE_VERIFICATION *$", Pattern.MULTILINE)
 
         private val ERROR_POLICY_PATTERN = Pattern.compile("^// *ERROR_POLICY: *(.+)$", Pattern.MULTILINE)
@@ -1216,4 +1309,6 @@ fun RuntimeDiagnostic.Companion.resolve(
     else -> {
         null
     }
-}
+}
+
+val v8tool by lazy { ExternalTool(System.getProperty("javascript.engine.path.V8")) }

js/js.tests/test/org/jetbrains/kotlin/js/test/BasicIrBoxTest.kt

@@ -10,7 +10,14 @@ import org.jetbrains.kotlin.backend.common.phaser.AnyNamedPhase
 import org.jetbrains.kotlin.backend.common.phaser.PhaseConfig
 import org.jetbrains.kotlin.backend.common.phaser.toPhaseMap
 import org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport
+import org.jetbrains.kotlin.config.CommonConfigurationKeys
 import org.jetbrains.kotlin.ir.backend.js.*
+import org.jetbrains.kotlin.ir.backend.js.codegen.CompilerOutputSink
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationGranularity.*
+import org.jetbrains.kotlin.ir.backend.js.codegen.JsGenerationOptions
+import org.jetbrains.kotlin.ir.backend.js.codegen.generateEsModules
+import org.jetbrains.kotlin.ir.backend.js.transformers.irToJs.IrModuleToJsTransformer
 import org.jetbrains.kotlin.ir.backend.js.ic.*
 import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.declarations.persistent.PersistentIrFactory
@@ -205,7 +212,8 @@ abstract class BasicIrBoxTest(
         needsFullIrRuntime: Boolean,
         isMainModule: Boolean,
         skipDceDriven: Boolean,
-        splitPerModule: Boolean,
+        esModules: Boolean,
+        granularity: JsGenerationGranularity,
         propertyLazyInitialization: Boolean,
         safeExternalBoolean: Boolean,
         safeExternalBooleanDiagnostic: RuntimeDiagnostic?,
@@ -213,7 +221,8 @@ abstract class BasicIrBoxTest(
         abiVersion: KotlinAbiVersion,
         incrementalCompilation: Boolean,
         recompile: Boolean,
-        icCache: MutableMap<String, TestModuleCache>
+        icCache: MutableMap<String, TestModuleCache>,
+        customTestModule: String?,
     ) {
         val filesToCompile = units.mapNotNull { (it as? TranslationUnit.SourceFile)?.file }
 
@@ -299,38 +308,73 @@ abstract class BasicIrBoxTest(
                 icCache = emptyMap()
             )
 
-            if (!skipRegularMode) {
-//                val dirtyFilesToRecompile = if (recompile) {
-//                    units.map { (it as TranslationUnit.SourceFile).file.virtualFilePath }.toSet()
-//                } else null
-                val dirtyFilesToRecompile: Set<String>? = null
 
-                val compiledModule = compile(
+            val mainArguments = mainCallParameters.run { if (shouldBeGenerated()) arguments() else null }
+            fun compileToLoweredIr(
+                dceDriven: Boolean,
+                granularity: JsGenerationGranularity,
+                dirtyFilesToRecompile: Set<String>? = null
+            ): LoweredIr =
+                compile(
                     module,
                     phaseConfig = phaseConfig,
                     irFactory = IrFactoryImpl,
-                    mainArguments = mainCallParameters.run { if (shouldBeGenerated()) arguments() else null },
                     exportedDeclarations = setOf(FqName.fromSegments(listOfNotNull(testPackage, testFunction))),
-                    generateFullJs = true,
-                    generateDceJs = runIrDce,
-                    dceDriven = false,
+                    dceDriven = dceDriven,
                     es6mode = runEs6Mode,
-                    multiModule = splitPerModule || perModule,
                     propertyLazyInitialization = propertyLazyInitialization,
+                    verifySignatures = !skipMangleVerification,
                     lowerPerModule = lowerPerModule,
                     safeExternalBoolean = safeExternalBoolean,
                     safeExternalBooleanDiagnostic = safeExternalBooleanDiagnostic,
-                    verifySignatures = !skipMangleVerification,
+                    granularity = granularity,
                     filesToLower = dirtyFilesToRecompile
                 )
 
-//                if (incrementalCompilation) {
-//                    // TODO: enable once incremental js generation is done
-//                    generateJsFromAst(klibPath, icCache.map { it.key to it.value.createModuleCache() }.toMap())
-//                }
+            fun generateTestFile(outputDir: File) {
+                val moduleName = config.configuration[CommonConfigurationKeys.MODULE_NAME]
+                val esmTestFile = File(outputDir, "test.mjs")
+                logger.logFile("ES module test file", esmTestFile)
+                val defaultTestModule =
+                    """                     
+                                import { box } from './${moduleName}/index.js';
+                                let res = box();
+                                if (res !== "OK") {
+                                    throw "Wrong result: " + String(res);
+                                }
+                                """.trimIndent()
 
-                val jsOutputFile = if (recompile) File(outputFile.parentFile, outputFile.nameWithoutExtension + "-recompiled.js")
-                else outputFile
+                esmTestFile.writeText(customTestModule ?: defaultTestModule)
+            }
+
+            val options = JsGenerationOptions(generatePackageJson = true, generateTypeScriptDefinitions = generateDts)
+
+            fun generateEsModules(ir: LoweredIr, outputDir: File, granularity: JsGenerationGranularity) {
+                outputDir.deleteRecursively()
+                generateEsModules(ir, jsOutputSink(outputDir), mainArguments = mainArguments, granularity = granularity, options = options)
+                generateTestFile(outputDir)
+            }
+
+            fun generateOldModuleSystems(
+                ir: LoweredIr,
+                outputFile: File,
+                outputDceFile: File,
+                granularity: JsGenerationGranularity,
+                runDce: Boolean,
+                dirtyFilesToRecompile: Set<String>? = null
+            ) {
+                outputFile.deleteRecursively()
+
+                check(granularity != PER_FILE) { "Per file granularity is not supported for old module systems" }
+                val transformer = IrModuleToJsTransformer(
+                    ir.context,
+                    mainArguments,
+                    fullJs = true,
+                    dceJs = runDce,
+                    multiModule = granularity == PER_MODULE,
+                    relativeRequirePath = false
+                )
+                val compiledModule: CompilerResult = transformer.generateModule(ir.allModules)
 
                 val compiledOutput = if (dirtyFilesToRecompile != null) CompilationOutputs(
                     """
@@ -343,9 +387,9 @@ abstract class BasicIrBoxTest(
                 ) else compiledModule.outputs!!
                 val compiledDCEOutput = if (dirtyFilesToRecompile != null) null else compiledModule.outputsAfterDce
 
-                compiledOutput.writeTo(jsOutputFile, config)
+                compiledOutput.writeTo(outputFile, config)
 
-                compiledDCEOutput?.writeTo(dceOutputFile, config)
+                compiledDCEOutput?.writeTo(outputDceFile, config)
 
                 if (generateDts) {
                     val dtsFile = outputFile.withReplacedExtensionOrNull("_v5.js", ".d.ts")!!
@@ -356,26 +400,31 @@ abstract class BasicIrBoxTest(
                 compiledOutput.jsProgram?.let { processJsProgram(it, units) }
             }
 
-            if (runIrPir) {
-                val compiledModule = compile(
-                    module,
-                    phaseConfig = phaseConfig,
-                    irFactory = PersistentIrFactory(),
-                    mainArguments = mainCallParameters.run { if (shouldBeGenerated()) arguments() else null },
-                    exportedDeclarations = setOf(FqName.fromSegments(listOfNotNull(testPackage, testFunction))),
-                    generateFullJs = true,
-                    generateDceJs = runIrDce,
-                    dceDriven = true,
-                    es6mode = runEs6Mode,
-                    multiModule = splitPerModule || perModule,
-                    propertyLazyInitialization = propertyLazyInitialization,
-                    lowerPerModule = lowerPerModule,
-                    safeExternalBoolean = safeExternalBoolean,
-                    safeExternalBooleanDiagnostic = safeExternalBooleanDiagnostic,
-                    verifySignatures = !skipMangleVerification,
-                )
-                compiledModule.outputs!!.writeTo(pirOutputFile, config)
-                processJsProgram(compiledModule.outputs!!.jsProgram!!, units)
+            @Suppress("NAME_SHADOWING")
+            val granularity = if (perModule) PER_MODULE else granularity
+
+            if (!skipRegularMode) {
+                val ir = compileToLoweredIr(dceDriven = false, granularity)
+                if (esModules) {
+                    generateEsModules(ir, outputFile.esModulesSubDir, granularity)
+                    if (runIrDce) {
+                        eliminateDeadDeclarations(ir.allModules, ir.context)
+                        generateEsModules(ir, dceOutputFile.esModulesSubDir, granularity)
+                    }
+                } else {
+                    val jsOutputFile = if (recompile) File(outputFile.parentFile, outputFile.nameWithoutExtension + "-recompiled.js")
+                    else outputFile
+                    generateOldModuleSystems(ir, jsOutputFile, dceOutputFile, granularity, runIrDce)
+                }
+            }
+
+            if (runIrPir && !skipDceDriven) {
+                val ir = compileToLoweredIr(dceDriven = true, granularity)
+                if (esModules) {
+                    generateEsModules(ir, pirOutputFile.esModulesSubDir, granularity)
+                } else {
+                    generateOldModuleSystems(ir, pirOutputFile, pirOutputFile, granularity, false)
+                }
             }
         }
     }
@@ -453,15 +502,19 @@ abstract class BasicIrBoxTest(
             needsFullIrRuntime,
             isMainModule,
             skipDceDriven = true,
-            splitPerModule = false, // TODO??
+            granularity = WHOLE_PROGRAM, // TODO??
             propertyLazyInitialization = true,
             safeExternalBoolean = false,
             safeExternalBooleanDiagnostic = null,
             skipMangleVerification = false,
-            KotlinAbiVersion.CURRENT,
+            abiVersion = KotlinAbiVersion.CURRENT,
             incrementalCompilation = true,
             recompile = true,
-            icCaches
+            icCache = icCaches,
+
+            // TODO??
+            customTestModule = null,
+            esModules = false,
         )
 
         val cacheProvider = icCache.cacheProvider()
@@ -481,6 +534,19 @@ abstract class BasicIrBoxTest(
         }
     }
 
+    private fun jsOutputSink(perFileOutputDir: File): CompilerOutputSink {
+        perFileOutputDir.deleteRecursively()
+        perFileOutputDir.mkdirs()
+
+        return object : CompilerOutputSink {
+            override fun write(module: String, path: String, content: String) {
+                val file = File(File(perFileOutputDir, module), path)
+                file.parentFile.mkdirs()
+                file.writeText(content)
+            }
+        }
+    }
+
     private fun createIcCache(
         path: String,
         dirtyFiles: Collection<String>?,
@@ -561,8 +627,10 @@ abstract class BasicIrBoxTest(
     }
 }
 
-
 private fun File.write(text: String) {
     parentFile.mkdirs()
     writeText(text)
 }
+
+val File.esModulesSubDir: File
+    get() = File(absolutePath + "_esm")

js/js.tests/test/org/jetbrains/kotlin/js/test/engines/SpiderMonkey.kt

@@ -7,8 +7,12 @@ package org.jetbrains.kotlin.js.test.engines
 
 import java.io.BufferedReader
 import java.io.InputStreamReader
+import java.lang.Boolean.getBoolean
 import kotlin.test.fail
 
+
+val toolLogsEnabled: Boolean = getBoolean("kotlin.js.test.verbose")
+
 class ExternalTool(val path: String) {
     fun run(vararg arguments: String) {
         val command = arrayOf(path, *arguments)
@@ -17,7 +21,9 @@ class ExternalTool(val path: String) {
             .start()
 
         val commandString = command.joinToString(" ") { escapeShellArgument(it) }
-        println(commandString)
+        if (toolLogsEnabled) {
+            println(commandString)
+        }
 
         // Print process output
         val input = BufferedReader(InputStreamReader(process.inputStream))

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/AbstractLegacyJsTypeScriptExportTest.kt

@@ -1,13 +0,0 @@
-/*
- * 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.js.test.semantics
-
-import org.jetbrains.kotlin.js.test.BasicBoxTest
-
-abstract class AbstractLegacyJsTypeScriptExportTest : BasicBoxTest(
-    pathToTestDir = TEST_DATA_DIR_PATH + "typescript-export/",
-    testGroupOutputDirPrefix = "legacy-typescript-export/"
-)

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrBoxJsES6TestGenerated.java

@@ -1587,6 +1587,494 @@ public class IrBoxJsES6TestGenerated extends AbstractIrBoxJsES6Test {
         }
     }
 
+    @TestMetadata("js/js.translator/testData/box/esModules")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class EsModules extends AbstractIrBoxJsES6Test {
+        private void runTest(String testDataFilePath) throws Exception {
+            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+        }
+
+        public void testAllFilesPresentInEsModules() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/crossModuleRef")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class CrossModuleRef extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInCrossModuleRef() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/crossModuleRef"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("callableObjectRef.kt")
+            public void testCallableObjectRef() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/callableObjectRef.kt");
+            }
+
+            @TestMetadata("constructor.kt")
+            public void testConstructor() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/constructor.kt");
+            }
+
+            @TestMetadata("inheritance.kt")
+            public void testInheritance() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inheritance.kt");
+            }
+
+            @TestMetadata("inlineJsModule.kt")
+            public void testInlineJsModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineJsModule.kt");
+            }
+
+            @TestMetadata("inlineJsModuleNonIdentifier.kt")
+            public void testInlineJsModuleNonIdentifier() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineJsModuleNonIdentifier.kt");
+            }
+
+            @TestMetadata("inlineJsModulePackage.kt")
+            public void testInlineJsModulePackage() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineJsModulePackage.kt");
+            }
+
+            @TestMetadata("inlineModule.kt")
+            public void testInlineModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineModule.kt");
+            }
+
+            @TestMetadata("inlineModuleNonIndentifier.kt")
+            public void testInlineModuleNonIndentifier() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineModuleNonIndentifier.kt");
+            }
+
+            @TestMetadata("lambda.kt")
+            public void testLambda() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/lambda.kt");
+            }
+
+            @TestMetadata("object.kt")
+            public void testObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/object.kt");
+            }
+
+            @TestMetadata("objectInInlineClosure.kt")
+            public void testObjectInInlineClosure() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/objectInInlineClosure.kt");
+            }
+
+            @TestMetadata("objectIsObject.kt")
+            public void testObjectIsObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/objectIsObject.kt");
+            }
+
+            @TestMetadata("topLevelExtension.kt")
+            public void testTopLevelExtension() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/topLevelExtension.kt");
+            }
+
+            @TestMetadata("topLevelFunction.kt")
+            public void testTopLevelFunction() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/topLevelFunction.kt");
+            }
+
+            @TestMetadata("topLevelMutableProperty.kt")
+            public void testTopLevelMutableProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/topLevelMutableProperty.kt");
+            }
+
+            @TestMetadata("topLevelProperty.kt")
+            public void testTopLevelProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/topLevelProperty.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/crossModuleRefPerFile")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class CrossModuleRefPerFile extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInCrossModuleRefPerFile() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/crossModuleRefPerFile"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("callableObjectRef.kt")
+            public void testCallableObjectRef() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/callableObjectRef.kt");
+            }
+
+            @TestMetadata("constructor.kt")
+            public void testConstructor() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/constructor.kt");
+            }
+
+            @TestMetadata("inheritance.kt")
+            public void testInheritance() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/inheritance.kt");
+            }
+
+            @TestMetadata("inlineModule.kt")
+            public void testInlineModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/inlineModule.kt");
+            }
+
+            @TestMetadata("inlineModuleNonIndentifier.kt")
+            public void testInlineModuleNonIndentifier() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/inlineModuleNonIndentifier.kt");
+            }
+
+            @TestMetadata("lambda.kt")
+            public void testLambda() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/lambda.kt");
+            }
+
+            @TestMetadata("object.kt")
+            public void testObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/object.kt");
+            }
+
+            @TestMetadata("objectInInlineClosure.kt")
+            public void testObjectInInlineClosure() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/objectInInlineClosure.kt");
+            }
+
+            @TestMetadata("objectIsObject.kt")
+            public void testObjectIsObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/objectIsObject.kt");
+            }
+
+            @TestMetadata("topLevelExtension.kt")
+            public void testTopLevelExtension() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelExtension.kt");
+            }
+
+            @TestMetadata("topLevelFunction.kt")
+            public void testTopLevelFunction() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelFunction.kt");
+            }
+
+            @TestMetadata("topLevelMutableProperty.kt")
+            public void testTopLevelMutableProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelMutableProperty.kt");
+            }
+
+            @TestMetadata("topLevelProperty.kt")
+            public void testTopLevelProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelProperty.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/crossModuleRefPerModule")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class CrossModuleRefPerModule extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInCrossModuleRefPerModule() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/crossModuleRefPerModule"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("callableObjectRef.kt")
+            public void testCallableObjectRef() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/callableObjectRef.kt");
+            }
+
+            @TestMetadata("constructor.kt")
+            public void testConstructor() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/constructor.kt");
+            }
+
+            @TestMetadata("inheritance.kt")
+            public void testInheritance() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/inheritance.kt");
+            }
+
+            @TestMetadata("inlineModule.kt")
+            public void testInlineModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/inlineModule.kt");
+            }
+
+            @TestMetadata("inlineModuleNonIndentifier.kt")
+            public void testInlineModuleNonIndentifier() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/inlineModuleNonIndentifier.kt");
+            }
+
+            @TestMetadata("lambda.kt")
+            public void testLambda() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/lambda.kt");
+            }
+
+            @TestMetadata("object.kt")
+            public void testObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/object.kt");
+            }
+
+            @TestMetadata("objectInInlineClosure.kt")
+            public void testObjectInInlineClosure() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/objectInInlineClosure.kt");
+            }
+
+            @TestMetadata("objectIsObject.kt")
+            public void testObjectIsObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/objectIsObject.kt");
+            }
+
+            @TestMetadata("topLevelExtension.kt")
+            public void testTopLevelExtension() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelExtension.kt");
+            }
+
+            @TestMetadata("topLevelFunction.kt")
+            public void testTopLevelFunction() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelFunction.kt");
+            }
+
+            @TestMetadata("topLevelMutableProperty.kt")
+            public void testTopLevelMutableProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelMutableProperty.kt");
+            }
+
+            @TestMetadata("topLevelProperty.kt")
+            public void testTopLevelProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelProperty.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/export")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Export extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInExport() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("exportAllFile.kt")
+            public void testExportAllFile() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/exportAllFile.kt");
+            }
+
+            @TestMetadata("nonIndetifierModuleName.kt")
+            public void testNonIndetifierModuleName() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/nonIndetifierModuleName.kt");
+            }
+
+            @TestMetadata("overriddenChainNonExportIntermediate.kt")
+            public void testOverriddenChainNonExportIntermediate() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/overriddenChainNonExportIntermediate.kt");
+            }
+
+            @TestMetadata("overriddenExternalMethodWithSameNameMethod.kt")
+            public void testOverriddenExternalMethodWithSameNameMethod() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/overriddenExternalMethodWithSameNameMethod.kt");
+            }
+
+            @TestMetadata("overriddenExternalMethodWithSameStableNameMethod.kt")
+            public void testOverriddenExternalMethodWithSameStableNameMethod() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/overriddenExternalMethodWithSameStableNameMethod.kt");
+            }
+
+            @TestMetadata("reservedModuleName.kt")
+            public void testReservedModuleName() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/reservedModuleName.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/incremental")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Incremental extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInIncremental() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/incremental"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("jsModule.kt")
+            public void testJsModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/incremental/jsModule.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/inline")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Inline extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInInline() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/inline"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("inlinedObjectLiteralIsCheck.kt")
+            public void testInlinedObjectLiteralIsCheck() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/inline/inlinedObjectLiteralIsCheck.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/jsExport")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class JsExport extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInJsExport() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/jsExport"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("dataClass.kt")
+            public void testDataClass() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsExport/dataClass.kt");
+            }
+
+            @TestMetadata("exportedDefaultStub.kt")
+            public void testExportedDefaultStub() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsExport/exportedDefaultStub.kt");
+            }
+
+            @TestMetadata("jsExportInClass.kt")
+            public void testJsExportInClass() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsExport/jsExportInClass.kt");
+            }
+
+            @TestMetadata("recursiveExport.kt")
+            public void testRecursiveExport() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsExport/recursiveExport.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/jsModule")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class JsModule extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInJsModule() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/jsModule"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("externalClass.kt")
+            public void testExternalClass() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalClass.kt");
+            }
+
+            @TestMetadata("externalClassNameClash.kt")
+            public void testExternalClassNameClash() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalClassNameClash.kt");
+            }
+
+            @TestMetadata("externalClassWithDefaults.kt")
+            public void testExternalClassWithDefaults() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalClassWithDefaults.kt");
+            }
+
+            @TestMetadata("externalConstructor.kt")
+            public void testExternalConstructor() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalConstructor.kt");
+            }
+
+            @TestMetadata("externalFunction.kt")
+            public void testExternalFunction() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalFunction.kt");
+            }
+
+            @TestMetadata("externalFunctionNameClash.kt")
+            public void testExternalFunctionNameClash() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalFunctionNameClash.kt");
+            }
+
+            @TestMetadata("externalObject.kt")
+            public void testExternalObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalObject.kt");
+            }
+
+            @TestMetadata("externalPackage.kt")
+            public void testExternalPackage() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalPackage.kt");
+            }
+
+            @TestMetadata("externalPackageInDifferentFile.kt")
+            public void testExternalPackageInDifferentFile() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalPackageInDifferentFile.kt");
+            }
+
+            @TestMetadata("externalProperty.kt")
+            public void testExternalProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalProperty.kt");
+            }
+
+            @TestMetadata("interfaces.kt")
+            public void testInterfaces() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/interfaces.kt");
+            }
+
+            @TestMetadata("topLevelVarargFun.kt")
+            public void testTopLevelVarargFun() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/topLevelVarargFun.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/jsName")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class JsName extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInJsName() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/jsName"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("defaultJsName.kt")
+            public void testDefaultJsName() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsName/defaultJsName.kt");
+            }
+
+            @TestMetadata("jsTopLevelClashes.kt")
+            public void testJsTopLevelClashes() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsName/jsTopLevelClashes.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/native")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Native extends AbstractIrBoxJsES6Test {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR_ES6, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInNative() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/native"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR_ES6, true);
+            }
+
+            @TestMetadata("inheritanceInNativeClass.kt")
+            public void testInheritanceInNativeClass() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/native/inheritanceInNativeClass.kt");
+            }
+        }
+    }
+
     @TestMetadata("js/js.translator/testData/box/examples")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)
@@ -2385,21 +2873,11 @@ public class IrBoxJsES6TestGenerated extends AbstractIrBoxJsES6Test {
                 runTest("js/js.translator/testData/box/expression/function/manglingClashFunctionsAndClasses.kt");
             }
 
-            @TestMetadata("manglingClashWithFunctionsWithoutParameters.kt")
-            public void testManglingClashWithFunctionsWithoutParameters() throws Exception {
-                runTest("js/js.translator/testData/box/expression/function/manglingClashWithFunctionsWithoutParameters.kt");
-            }
-
             @TestMetadata("manglingImportedFromObjectWithNI.kt")
             public void testManglingImportedFromObjectWithNI() throws Exception {
                 runTest("js/js.translator/testData/box/expression/function/manglingImportedFromObjectWithNI.kt");
             }
 
-            @TestMetadata("manglingStability.kt")
-            public void testManglingStability() throws Exception {
-                runTest("js/js.translator/testData/box/expression/function/manglingStability.kt");
-            }
-
             @TestMetadata("namedArguments.kt")
             public void testNamedArguments() throws Exception {
                 runTest("js/js.translator/testData/box/expression/function/namedArguments.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/es6/semantics/IrJsCodegenBoxES6TestGenerated.java

@@ -20145,11 +20145,6 @@ public class IrJsCodegenBoxES6TestGenerated extends AbstractIrJsCodegenBoxES6Tes
             runTest("compiler/testData/codegen/box/properties/lazyInitializationOrder.kt");
         }
 
-        @TestMetadata("lazyInitializationPure.kt")
-        public void testLazyInitializationPure() throws Exception {
-            runTest("compiler/testData/codegen/box/properties/lazyInitializationPure.kt");
-        }
-
         @TestMetadata("lazyInitializationSplitPerModule.kt")
         public void testLazyInitializationSplitPerModule() throws Exception {
             runTest("compiler/testData/codegen/box/properties/lazyInitializationSplitPerModule.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrBoxJsTestGenerated.java

@@ -1587,6 +1587,494 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
         }
     }
 
+    @TestMetadata("js/js.translator/testData/box/esModules")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class EsModules extends AbstractIrBoxJsTest {
+        private void runTest(String testDataFilePath) throws Exception {
+            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+        }
+
+        public void testAllFilesPresentInEsModules() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/crossModuleRef")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class CrossModuleRef extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInCrossModuleRef() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/crossModuleRef"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("callableObjectRef.kt")
+            public void testCallableObjectRef() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/callableObjectRef.kt");
+            }
+
+            @TestMetadata("constructor.kt")
+            public void testConstructor() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/constructor.kt");
+            }
+
+            @TestMetadata("inheritance.kt")
+            public void testInheritance() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inheritance.kt");
+            }
+
+            @TestMetadata("inlineJsModule.kt")
+            public void testInlineJsModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineJsModule.kt");
+            }
+
+            @TestMetadata("inlineJsModuleNonIdentifier.kt")
+            public void testInlineJsModuleNonIdentifier() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineJsModuleNonIdentifier.kt");
+            }
+
+            @TestMetadata("inlineJsModulePackage.kt")
+            public void testInlineJsModulePackage() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineJsModulePackage.kt");
+            }
+
+            @TestMetadata("inlineModule.kt")
+            public void testInlineModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineModule.kt");
+            }
+
+            @TestMetadata("inlineModuleNonIndentifier.kt")
+            public void testInlineModuleNonIndentifier() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/inlineModuleNonIndentifier.kt");
+            }
+
+            @TestMetadata("lambda.kt")
+            public void testLambda() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/lambda.kt");
+            }
+
+            @TestMetadata("object.kt")
+            public void testObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/object.kt");
+            }
+
+            @TestMetadata("objectInInlineClosure.kt")
+            public void testObjectInInlineClosure() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/objectInInlineClosure.kt");
+            }
+
+            @TestMetadata("objectIsObject.kt")
+            public void testObjectIsObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/objectIsObject.kt");
+            }
+
+            @TestMetadata("topLevelExtension.kt")
+            public void testTopLevelExtension() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/topLevelExtension.kt");
+            }
+
+            @TestMetadata("topLevelFunction.kt")
+            public void testTopLevelFunction() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/topLevelFunction.kt");
+            }
+
+            @TestMetadata("topLevelMutableProperty.kt")
+            public void testTopLevelMutableProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/topLevelMutableProperty.kt");
+            }
+
+            @TestMetadata("topLevelProperty.kt")
+            public void testTopLevelProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRef/topLevelProperty.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/crossModuleRefPerFile")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class CrossModuleRefPerFile extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInCrossModuleRefPerFile() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/crossModuleRefPerFile"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("callableObjectRef.kt")
+            public void testCallableObjectRef() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/callableObjectRef.kt");
+            }
+
+            @TestMetadata("constructor.kt")
+            public void testConstructor() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/constructor.kt");
+            }
+
+            @TestMetadata("inheritance.kt")
+            public void testInheritance() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/inheritance.kt");
+            }
+
+            @TestMetadata("inlineModule.kt")
+            public void testInlineModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/inlineModule.kt");
+            }
+
+            @TestMetadata("inlineModuleNonIndentifier.kt")
+            public void testInlineModuleNonIndentifier() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/inlineModuleNonIndentifier.kt");
+            }
+
+            @TestMetadata("lambda.kt")
+            public void testLambda() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/lambda.kt");
+            }
+
+            @TestMetadata("object.kt")
+            public void testObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/object.kt");
+            }
+
+            @TestMetadata("objectInInlineClosure.kt")
+            public void testObjectInInlineClosure() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/objectInInlineClosure.kt");
+            }
+
+            @TestMetadata("objectIsObject.kt")
+            public void testObjectIsObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/objectIsObject.kt");
+            }
+
+            @TestMetadata("topLevelExtension.kt")
+            public void testTopLevelExtension() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelExtension.kt");
+            }
+
+            @TestMetadata("topLevelFunction.kt")
+            public void testTopLevelFunction() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelFunction.kt");
+            }
+
+            @TestMetadata("topLevelMutableProperty.kt")
+            public void testTopLevelMutableProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelMutableProperty.kt");
+            }
+
+            @TestMetadata("topLevelProperty.kt")
+            public void testTopLevelProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelProperty.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/crossModuleRefPerModule")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class CrossModuleRefPerModule extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInCrossModuleRefPerModule() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/crossModuleRefPerModule"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("callableObjectRef.kt")
+            public void testCallableObjectRef() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/callableObjectRef.kt");
+            }
+
+            @TestMetadata("constructor.kt")
+            public void testConstructor() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/constructor.kt");
+            }
+
+            @TestMetadata("inheritance.kt")
+            public void testInheritance() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/inheritance.kt");
+            }
+
+            @TestMetadata("inlineModule.kt")
+            public void testInlineModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/inlineModule.kt");
+            }
+
+            @TestMetadata("inlineModuleNonIndentifier.kt")
+            public void testInlineModuleNonIndentifier() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/inlineModuleNonIndentifier.kt");
+            }
+
+            @TestMetadata("lambda.kt")
+            public void testLambda() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/lambda.kt");
+            }
+
+            @TestMetadata("object.kt")
+            public void testObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/object.kt");
+            }
+
+            @TestMetadata("objectInInlineClosure.kt")
+            public void testObjectInInlineClosure() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/objectInInlineClosure.kt");
+            }
+
+            @TestMetadata("objectIsObject.kt")
+            public void testObjectIsObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/objectIsObject.kt");
+            }
+
+            @TestMetadata("topLevelExtension.kt")
+            public void testTopLevelExtension() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelExtension.kt");
+            }
+
+            @TestMetadata("topLevelFunction.kt")
+            public void testTopLevelFunction() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelFunction.kt");
+            }
+
+            @TestMetadata("topLevelMutableProperty.kt")
+            public void testTopLevelMutableProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelMutableProperty.kt");
+            }
+
+            @TestMetadata("topLevelProperty.kt")
+            public void testTopLevelProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelProperty.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/export")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Export extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInExport() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("exportAllFile.kt")
+            public void testExportAllFile() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/exportAllFile.kt");
+            }
+
+            @TestMetadata("nonIndetifierModuleName.kt")
+            public void testNonIndetifierModuleName() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/nonIndetifierModuleName.kt");
+            }
+
+            @TestMetadata("overriddenChainNonExportIntermediate.kt")
+            public void testOverriddenChainNonExportIntermediate() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/overriddenChainNonExportIntermediate.kt");
+            }
+
+            @TestMetadata("overriddenExternalMethodWithSameNameMethod.kt")
+            public void testOverriddenExternalMethodWithSameNameMethod() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/overriddenExternalMethodWithSameNameMethod.kt");
+            }
+
+            @TestMetadata("overriddenExternalMethodWithSameStableNameMethod.kt")
+            public void testOverriddenExternalMethodWithSameStableNameMethod() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/overriddenExternalMethodWithSameStableNameMethod.kt");
+            }
+
+            @TestMetadata("reservedModuleName.kt")
+            public void testReservedModuleName() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/reservedModuleName.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/incremental")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Incremental extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInIncremental() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/incremental"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("jsModule.kt")
+            public void testJsModule() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/incremental/jsModule.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/inline")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Inline extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInInline() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/inline"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("inlinedObjectLiteralIsCheck.kt")
+            public void testInlinedObjectLiteralIsCheck() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/inline/inlinedObjectLiteralIsCheck.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/jsExport")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class JsExport extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInJsExport() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/jsExport"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("dataClass.kt")
+            public void testDataClass() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsExport/dataClass.kt");
+            }
+
+            @TestMetadata("exportedDefaultStub.kt")
+            public void testExportedDefaultStub() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsExport/exportedDefaultStub.kt");
+            }
+
+            @TestMetadata("jsExportInClass.kt")
+            public void testJsExportInClass() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsExport/jsExportInClass.kt");
+            }
+
+            @TestMetadata("recursiveExport.kt")
+            public void testRecursiveExport() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsExport/recursiveExport.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/jsModule")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class JsModule extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInJsModule() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/jsModule"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("externalClass.kt")
+            public void testExternalClass() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalClass.kt");
+            }
+
+            @TestMetadata("externalClassNameClash.kt")
+            public void testExternalClassNameClash() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalClassNameClash.kt");
+            }
+
+            @TestMetadata("externalClassWithDefaults.kt")
+            public void testExternalClassWithDefaults() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalClassWithDefaults.kt");
+            }
+
+            @TestMetadata("externalConstructor.kt")
+            public void testExternalConstructor() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalConstructor.kt");
+            }
+
+            @TestMetadata("externalFunction.kt")
+            public void testExternalFunction() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalFunction.kt");
+            }
+
+            @TestMetadata("externalFunctionNameClash.kt")
+            public void testExternalFunctionNameClash() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalFunctionNameClash.kt");
+            }
+
+            @TestMetadata("externalObject.kt")
+            public void testExternalObject() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalObject.kt");
+            }
+
+            @TestMetadata("externalPackage.kt")
+            public void testExternalPackage() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalPackage.kt");
+            }
+
+            @TestMetadata("externalPackageInDifferentFile.kt")
+            public void testExternalPackageInDifferentFile() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalPackageInDifferentFile.kt");
+            }
+
+            @TestMetadata("externalProperty.kt")
+            public void testExternalProperty() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/externalProperty.kt");
+            }
+
+            @TestMetadata("interfaces.kt")
+            public void testInterfaces() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/interfaces.kt");
+            }
+
+            @TestMetadata("topLevelVarargFun.kt")
+            public void testTopLevelVarargFun() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsModule/topLevelVarargFun.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/jsName")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class JsName extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInJsName() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/jsName"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("defaultJsName.kt")
+            public void testDefaultJsName() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsName/defaultJsName.kt");
+            }
+
+            @TestMetadata("jsTopLevelClashes.kt")
+            public void testJsTopLevelClashes() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/jsName/jsTopLevelClashes.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/native")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Native extends AbstractIrBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS_IR, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInNative() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/native"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS_IR, true);
+            }
+
+            @TestMetadata("inheritanceInNativeClass.kt")
+            public void testInheritanceInNativeClass() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/native/inheritanceInNativeClass.kt");
+            }
+        }
+    }
+
     @TestMetadata("js/js.translator/testData/box/examples")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)
@@ -2385,21 +2873,11 @@ public class IrBoxJsTestGenerated extends AbstractIrBoxJsTest {
                 runTest("js/js.translator/testData/box/expression/function/manglingClashFunctionsAndClasses.kt");
             }
 
-            @TestMetadata("manglingClashWithFunctionsWithoutParameters.kt")
-            public void testManglingClashWithFunctionsWithoutParameters() throws Exception {
-                runTest("js/js.translator/testData/box/expression/function/manglingClashWithFunctionsWithoutParameters.kt");
-            }
-
             @TestMetadata("manglingImportedFromObjectWithNI.kt")
             public void testManglingImportedFromObjectWithNI() throws Exception {
                 runTest("js/js.translator/testData/box/expression/function/manglingImportedFromObjectWithNI.kt");
             }
 
-            @TestMetadata("manglingStability.kt")
-            public void testManglingStability() throws Exception {
-                runTest("js/js.translator/testData/box/expression/function/manglingStability.kt");
-            }
-
             @TestMetadata("namedArguments.kt")
             public void testNamedArguments() throws Exception {
                 runTest("js/js.translator/testData/box/expression/function/namedArguments.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/semantics/IrJsCodegenBoxTestGenerated.java

@@ -19551,11 +19551,6 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
             runTest("compiler/testData/codegen/box/properties/lazyInitializationOrder.kt");
         }
 
-        @TestMetadata("lazyInitializationPure.kt")
-        public void testLazyInitializationPure() throws Exception {
-            runTest("compiler/testData/codegen/box/properties/lazyInitializationPure.kt");
-        }
-
         @TestMetadata("lazyInitializationSplitPerModule.kt")
         public void testLazyInitializationSplitPerModule() throws Exception {
             runTest("compiler/testData/codegen/box/properties/lazyInitializationSplitPerModule.kt");

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/BoxJsTestGenerated.java

@@ -1592,6 +1592,159 @@ public class BoxJsTestGenerated extends AbstractBoxJsTest {
         }
     }
 
+    @TestMetadata("js/js.translator/testData/box/esModules")
+    @TestDataPath("$PROJECT_ROOT")
+    @RunWith(JUnit3RunnerWithInners.class)
+    public static class EsModules extends AbstractBoxJsTest {
+        private void runTest(String testDataFilePath) throws Exception {
+            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+        }
+
+        public void testAllFilesPresentInEsModules() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/crossModuleRef")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class CrossModuleRef extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInCrossModuleRef() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/crossModuleRef"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/crossModuleRefPerFile")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class CrossModuleRefPerFile extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInCrossModuleRefPerFile() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/crossModuleRefPerFile"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/crossModuleRefPerModule")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class CrossModuleRefPerModule extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInCrossModuleRefPerModule() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/crossModuleRefPerModule"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/export")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Export extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInExport() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+
+            @TestMetadata("overriddenExternalMethodWithSameStableNameMethod.kt")
+            public void testOverriddenExternalMethodWithSameStableNameMethod() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/overriddenExternalMethodWithSameStableNameMethod.kt");
+            }
+
+            @TestMetadata("reservedModuleName.kt")
+            public void testReservedModuleName() throws Exception {
+                runTest("js/js.translator/testData/box/esModules/export/reservedModuleName.kt");
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/incremental")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Incremental extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInIncremental() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/incremental"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/inline")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Inline extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInInline() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/inline"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/jsExport")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class JsExport extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInJsExport() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/jsExport"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/jsModule")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class JsModule extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInJsModule() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/jsModule"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/jsName")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class JsName extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInJsName() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/jsName"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+        }
+
+        @TestMetadata("js/js.translator/testData/box/esModules/native")
+        @TestDataPath("$PROJECT_ROOT")
+        @RunWith(JUnit3RunnerWithInners.class)
+        public static class Native extends AbstractBoxJsTest {
+            private void runTest(String testDataFilePath) throws Exception {
+                KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
+            }
+
+            public void testAllFilesPresentInNative() throws Exception {
+                KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/box/esModules/native"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
+            }
+        }
+    }
+
     @TestMetadata("js/js.translator/testData/box/examples")
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/semantics/LegacyJsTypeScriptExportTestGenerated.java

@@ -1,181 +0,0 @@
-/*
- * Copyright 2010-2021 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.js.test.semantics;
-
-import com.intellij.testFramework.TestDataPath;
-import org.jetbrains.kotlin.test.JUnit3RunnerWithInners;
-import org.jetbrains.kotlin.test.KotlinTestUtils;
-import org.jetbrains.kotlin.test.util.KtTestUtil;
-import org.jetbrains.kotlin.test.TargetBackend;
-import org.jetbrains.kotlin.test.TestMetadata;
-import org.junit.runner.RunWith;
-
-import java.io.File;
-import java.util.regex.Pattern;
-
-/** This class is generated by {@link org.jetbrains.kotlin.generators.tests.TestsPackage}. DO NOT MODIFY MANUALLY */
-@SuppressWarnings("all")
-@TestMetadata("js/js.translator/testData/typescript-export")
-@TestDataPath("$PROJECT_ROOT")
-@RunWith(JUnit3RunnerWithInners.class)
-public class LegacyJsTypeScriptExportTestGenerated extends AbstractLegacyJsTypeScriptExportTest {
-    private void runTest(String testDataFilePath) throws Exception {
-        KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
-    }
-
-    public void testAllFilesPresentInTypescript_export() throws Exception {
-        KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/typescript-export"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
-    }
-
-    @TestMetadata("js/js.translator/testData/typescript-export/constructors")
-    @TestDataPath("$PROJECT_ROOT")
-    @RunWith(JUnit3RunnerWithInners.class)
-    public static class Constructors extends AbstractLegacyJsTypeScriptExportTest {
-        private void runTest(String testDataFilePath) throws Exception {
-            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
-        }
-
-        public void testAllFilesPresentInConstructors() throws Exception {
-            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/typescript-export/constructors"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
-        }
-    }
-
-    @TestMetadata("js/js.translator/testData/typescript-export/declarations")
-    @TestDataPath("$PROJECT_ROOT")
-    @RunWith(JUnit3RunnerWithInners.class)
-    public static class Declarations extends AbstractLegacyJsTypeScriptExportTest {
-        private void runTest(String testDataFilePath) throws Exception {
-            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
-        }
-
-        public void testAllFilesPresentInDeclarations() throws Exception {
-            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/typescript-export/declarations"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
-        }
-
-        @TestMetadata("declarations.kt")
-        public void testDeclarations() throws Exception {
-            runTest("js/js.translator/testData/typescript-export/declarations/declarations.kt");
-        }
-    }
-
-    @TestMetadata("js/js.translator/testData/typescript-export/inheritance")
-    @TestDataPath("$PROJECT_ROOT")
-    @RunWith(JUnit3RunnerWithInners.class)
-    public static class Inheritance extends AbstractLegacyJsTypeScriptExportTest {
-        private void runTest(String testDataFilePath) throws Exception {
-            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
-        }
-
-        public void testAllFilesPresentInInheritance() throws Exception {
-            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/typescript-export/inheritance"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
-        }
-
-        @TestMetadata("inheritance.kt")
-        public void testInheritance() throws Exception {
-            runTest("js/js.translator/testData/typescript-export/inheritance/inheritance.kt");
-        }
-    }
-
-    @TestMetadata("js/js.translator/testData/typescript-export/moduleSystems")
-    @TestDataPath("$PROJECT_ROOT")
-    @RunWith(JUnit3RunnerWithInners.class)
-    public static class ModuleSystems extends AbstractLegacyJsTypeScriptExportTest {
-        private void runTest(String testDataFilePath) throws Exception {
-            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
-        }
-
-        public void testAllFilesPresentInModuleSystems() throws Exception {
-            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/typescript-export/moduleSystems"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
-        }
-
-        @TestMetadata("commonjs.kt")
-        public void testCommonjs() throws Exception {
-            runTest("js/js.translator/testData/typescript-export/moduleSystems/commonjs.kt");
-        }
-
-        @TestMetadata("plain.kt")
-        public void testPlain() throws Exception {
-            runTest("js/js.translator/testData/typescript-export/moduleSystems/plain.kt");
-        }
-
-        @TestMetadata("umd.kt")
-        public void testUmd() throws Exception {
-            runTest("js/js.translator/testData/typescript-export/moduleSystems/umd.kt");
-        }
-    }
-
-    @TestMetadata("js/js.translator/testData/typescript-export/namespaces")
-    @TestDataPath("$PROJECT_ROOT")
-    @RunWith(JUnit3RunnerWithInners.class)
-    public static class Namespaces extends AbstractLegacyJsTypeScriptExportTest {
-        private void runTest(String testDataFilePath) throws Exception {
-            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
-        }
-
-        public void testAllFilesPresentInNamespaces() throws Exception {
-            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/typescript-export/namespaces"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
-        }
-
-        @TestMetadata("namespaces.kt")
-        public void testNamespaces() throws Exception {
-            runTest("js/js.translator/testData/typescript-export/namespaces/namespaces.kt");
-        }
-    }
-
-    @TestMetadata("js/js.translator/testData/typescript-export/primitives")
-    @TestDataPath("$PROJECT_ROOT")
-    @RunWith(JUnit3RunnerWithInners.class)
-    public static class Primitives extends AbstractLegacyJsTypeScriptExportTest {
-        private void runTest(String testDataFilePath) throws Exception {
-            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
-        }
-
-        public void testAllFilesPresentInPrimitives() throws Exception {
-            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/typescript-export/primitives"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
-        }
-
-        @TestMetadata("primitives.kt")
-        public void testPrimitives() throws Exception {
-            runTest("js/js.translator/testData/typescript-export/primitives/primitives.kt");
-        }
-    }
-
-    @TestMetadata("js/js.translator/testData/typescript-export/selectiveExport")
-    @TestDataPath("$PROJECT_ROOT")
-    @RunWith(JUnit3RunnerWithInners.class)
-    public static class SelectiveExport extends AbstractLegacyJsTypeScriptExportTest {
-        private void runTest(String testDataFilePath) throws Exception {
-            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
-        }
-
-        public void testAllFilesPresentInSelectiveExport() throws Exception {
-            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/typescript-export/selectiveExport"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
-        }
-
-        @TestMetadata("selectiveExport.kt")
-        public void testSelectiveExport() throws Exception {
-            runTest("js/js.translator/testData/typescript-export/selectiveExport/selectiveExport.kt");
-        }
-    }
-
-    @TestMetadata("js/js.translator/testData/typescript-export/visibility")
-    @TestDataPath("$PROJECT_ROOT")
-    @RunWith(JUnit3RunnerWithInners.class)
-    public static class Visibility extends AbstractLegacyJsTypeScriptExportTest {
-        private void runTest(String testDataFilePath) throws Exception {
-            KotlinTestUtils.runTest0(this::doTest, TargetBackend.JS, testDataFilePath);
-        }
-
-        public void testAllFilesPresentInVisibility() throws Exception {
-            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("js/js.translator/testData/typescript-export/visibility"), Pattern.compile("^([^_](.+))\\.kt$"), null, TargetBackend.JS, true);
-        }
-
-        @TestMetadata("visibility.kt")
-        public void testVisibility() throws Exception {
-            runTest("js/js.translator/testData/typescript-export/visibility/visibility.kt");
-        }
-    }
-}

js/js.translator/src/org/jetbrains/kotlin/js/translate/general/ModuleWrapperTranslation.kt

@@ -31,6 +31,7 @@ object ModuleWrapperTranslation {
             ModuleKind.COMMON_JS -> wrapCommonJs(function, importedModules, program)
             ModuleKind.UMD -> wrapUmd(moduleId, function, importedModules, program)
             ModuleKind.PLAIN -> wrapPlain(moduleId, function, importedModules, program)
+            ModuleKind.ES -> error("ES modules are not supported in legacy wrapper")
         }
     }
 

js/js.translator/testData/box/esModules/crossModuleRef/callableObjectRef.kt

@@ -0,0 +1,27 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+object O {
+    operator fun invoke() = "OK"
+}
+
+inline fun callO() = O()
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = O()
+    if (a != "OK") return "fail: simple: $a"
+
+    val b = callO()
+    if (b != "OK") return "fail: inline: $a"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRef/constructor.kt

@@ -0,0 +1,72 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+class A(val x: Int) {
+    constructor(a: Int, b: Int) : this(a + b)
+}
+
+external class B(x: Int) {
+    constructor(a: Int, b: Int)
+
+    val x: Int
+}
+
+// TODO: may be useful after implementing local classes in inline functions
+/*
+inline fun foo(p: Int, q: Int, r: Int): Pair<Int, Int> {
+    class C(val x : Int) {
+        constructor(a: Int, b: Int) : this(a + b)
+    }
+    return Pair(C(p).x, C(q, r).x)
+}
+*/
+
+inline fun callPrimaryConstructor(x: Int) = A(x).x
+
+inline fun callSecondaryConstructor(x: Int, y: Int) = A(x, y).x
+
+// FILE: lib.js
+
+function B(x, y) {
+    this.x = x;
+    if (typeof y !== 'undefined') {
+        this.x += y;
+    }
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = A(23).x
+    if (a != 23) return "fail: primary constructor: $a"
+
+    val b = A(40, 2).x
+    if (b != 42) return "fail: secondary constructor: $b"
+
+    val c = B(99).x
+    if (c != 99) return "fail: native primary constructor: $c"
+
+    val d = B(100, 11).x
+    if (d != 111) return "fail: native secondary constructor: $d"
+
+    /*
+    val (e, f) = foo(123, 320, 1)
+    if (e != 123) return "fail: local primary constructor: $e"
+    if (f != 321) return "fail: local secondary constructor: $f"
+    */
+
+    val g = callPrimaryConstructor(55)
+    if (g != 55) return "fail: primary constructor from inline function: $g"
+
+    val h = callSecondaryConstructor(990, 9)
+    if (h != 999) return "fail: secondary constructor from inline function: $h"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRef/inheritance.kt

@@ -0,0 +1,27 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+open class A {
+    fun foo() = 23
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+import lib.A
+
+class B : A() {
+    fun bar() = foo() + 1
+}
+
+fun box(): String {
+    val result = B().bar()
+    if (result != 24) return "fail: $result"
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRef/inlineJsModule.kt

@@ -0,0 +1,20 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// FILE: lib1.mjs
+export default function() {
+    return "OK";
+}
+
+// MODULE: lib2
+// FILE: lib2.kt
+@JsModule("./lib1.mjs")
+external fun foo(): String
+
+// MODULE: lib3(lib2)
+// FILE: lib3.kt
+inline fun bar() = foo()
+
+// MODULE: main(lib3)
+// FILE: main.kt
+
+fun box() = bar()

js/js.translator/testData/box/esModules/crossModuleRef/inlineJsModuleNonIdentifier.kt

@@ -0,0 +1,20 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// FILE: lib-1.mjs
+export default function foo() {
+    return "OK";
+}
+
+// MODULE: lib2
+// FILE: lib2.kt
+@JsModule("./lib-1.mjs")
+external fun foo(): String
+
+// MODULE: lib3(lib2)
+// FILE: lib3.kt
+inline fun bar() = foo()
+
+// MODULE: main(lib3)
+// FILE: main.kt
+
+fun box() = bar()

js/js.translator/testData/box/esModules/crossModuleRef/inlineJsModulePackage.kt

@@ -0,0 +1,21 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// FILE: lib1.mjs
+export function foo() {
+    return "OK";
+}
+
+// MODULE: lib2
+// FILE: lib2.kt
+@file:JsModule("./lib1.mjs")
+
+external fun foo(): String
+
+// MODULE: lib3(lib2)
+// FILE: lib3.kt
+inline fun bar() = foo()
+
+// MODULE: main(lib3)
+// FILE: main.kt
+
+fun box() = bar()

js/js.translator/testData/box/esModules/crossModuleRef/inlineModule.kt

@@ -0,0 +1,16 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib1
+// FILE: lib1.kt
+
+fun foo() = "OK"
+
+// MODULE: lib2(lib1)
+// FILE: lib2.kt
+
+inline fun bar() = foo()
+
+// MODULE: main(lib1, lib2)
+// FILE: main.kt
+
+fun box() = bar()

js/js.translator/testData/box/esModules/crossModuleRef/inlineModuleNonIndentifier.kt

@@ -0,0 +1,16 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: 1
+// FILE: lib1.kt
+
+fun foo() = "OK"
+
+// MODULE: 2(1)
+// FILE: lib2.kt
+
+inline fun bar() = foo()
+
+// MODULE: main(2)
+// FILE: main.kt
+
+fun box() = bar()

js/js.translator/testData/box/esModules/crossModuleRef/lambda.kt

@@ -0,0 +1,19 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+fun bar(f: () -> String) = f()
+
+inline fun foo(): String {
+    return bar { "OK" }
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box() = foo()

js/js.translator/testData/box/esModules/crossModuleRef/object.kt

@@ -0,0 +1,37 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+var log = ""
+
+object O {
+    init {
+        log += "O.init;"
+    }
+
+    fun result() = "OK"
+}
+
+fun getResult(): String {
+    log += "before;"
+    val result = O.result()
+    log += "after;"
+    return result
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val result = getResult()
+    if (result != "OK") return "fail: unexpected result: $result"
+
+    if (log != "before;O.init;after;") return "fail: wrong evaluation order: $log"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRef/objectInInlineClosure.kt

@@ -0,0 +1,27 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+object O {
+    val result = "OK"
+
+    inline fun foo(): String {
+        val o = object {
+            fun bar() = O
+        }
+        return fetch(o.bar())
+    }
+}
+
+fun fetch(o: O) = o.result
+
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box() = O.foo()

js/js.translator/testData/box/esModules/crossModuleRef/objectIsObject.kt

@@ -0,0 +1,21 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+object O
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    var o: Any = O
+    if (o !is O) return "fail1"
+    if (!(o is O)) return "fail2"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRef/topLevelExtension.kt

@@ -0,0 +1,44 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+class A(val x: Int)
+
+fun A.foo() = 23 + x
+
+inline fun A.baz() = 99 + x
+
+inline fun A.callFoo() = foo()
+
+inline fun A.buzz(): Int {
+    val o = object {
+        fun f() = 111 + x
+    }
+    return o.f()
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = A(1).foo()
+    if (a != 24) return "fail: simple function: $a"
+
+    val c = A(1).baz()
+    if (c != 100) return "fail: inline function: $c"
+
+    val d = A(1).buzz()
+    if (d != 112) return "fail: inline function with object expression: $d"
+
+    val e = A(2).callFoo()
+    if (e != 25) return "fail: inline function calling another function: $e"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRef/topLevelFunction.kt

@@ -0,0 +1,51 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+fun foo() = 23
+
+external fun bar(): Int = definedExternally
+
+inline fun baz() = 99
+
+inline fun callFoo() = foo()
+
+inline fun buzz(): Int {
+    val o = object {
+        fun f() = 111
+    }
+    return o.f()
+}
+
+// FILE: lib.js
+
+function bar() {
+    return 42;
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+fun box(): String {
+    val a = lib.foo()
+    if (a != 23) return "fail: simple function: $a"
+
+    val b = lib.bar()
+    if (b != 42) return "fail: native function: $b"
+
+    val c = lib.baz()
+    if (c != 99) return "fail: inline function: $c"
+
+    val d = lib.buzz()
+    if (d != 111) return "fail: inline function with object expression: $d"
+
+    val e = lib.callFoo()
+    if (e != 23) return "fail: inline function calling another function: $e"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRef/topLevelMutableProperty.kt

@@ -0,0 +1,38 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+var foo = 23
+
+var bar: Int = 42
+    get() = field
+    set(value) {
+        field = value
+    }
+
+@JsName("faz") var baz = 99
+
+// MODULE: main(lib)
+// FILE: lib.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    if (foo != 23) return "fail: simple property initial value: $foo"
+    foo = 24
+    if (foo != 24) return "fail: simple property new value: $foo"
+
+    if (bar != 42) return "fail: property with accessor initial value: $bar"
+    bar = 43
+    if (bar != 43) return "fail: property with accessor new value: $bar"
+
+    if (baz != 99) return "fail: renamed property initial value: $baz"
+    baz = 100
+    if (baz != 100) return "fail: renamed property new value: $baz"
+
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRef/topLevelProperty.kt

@@ -0,0 +1,48 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+val foo = 23
+
+val boo: Int
+    get() = 42
+
+external val bar: Int = definedExternally
+
+external val far: Int
+    get() = definedExternally
+
+// TODO: annotations like this are not serialized properly. Uncomment after KT-14529 gets fixed
+/*
+val fuzz: Int
+    @JsName("getBuzz") get() = 55
+    */
+
+inline fun fetchFoo() = foo
+
+@JsName("fee")
+val tee = 2525
+
+// FILE: lib.js
+
+var bar = 99
+var far = 111
+
+// MODULE: main(lib)
+// FILE: lib.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    if (foo != 23) return "fail: simple property: $foo"
+    if (boo != 42) return "fail: property with accessor: $boo"
+    if (bar != 99) return "fail: native property: $bar"
+    if (far != 111) return "fail: native property with accessor: $far"
+    //if (fuzz != 55) return "fail: property with JsName on accessor: $fuzz"
+    if (tee != 2525) return "fail: native property with JsName: $tee"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerFile/callableObjectRef.kt

@@ -0,0 +1,29 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1289
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+object O {
+    operator fun invoke() = "OK"
+}
+
+inline fun callO() = O()
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = O()
+    if (a != "OK") return "fail: simple: $a"
+
+    val b = callO()
+    if (b != "OK") return "fail: inline: $a"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerFile/constructor.kt

@@ -0,0 +1,74 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1291
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+class A(val x: Int) {
+    constructor(a: Int, b: Int) : this(a + b)
+}
+
+external class B(x: Int) {
+    constructor(a: Int, b: Int)
+
+    val x: Int
+}
+
+// TODO: may be useful after implementing local classes in inline functions
+/*
+inline fun foo(p: Int, q: Int, r: Int): Pair<Int, Int> {
+    class C(val x : Int) {
+        constructor(a: Int, b: Int) : this(a + b)
+    }
+    return Pair(C(p).x, C(q, r).x)
+}
+*/
+
+inline fun callPrimaryConstructor(x: Int) = A(x).x
+
+inline fun callSecondaryConstructor(x: Int, y: Int) = A(x, y).x
+
+// FILE: lib.js
+
+function B(x, y) {
+    this.x = x;
+    if (typeof y !== 'undefined') {
+        this.x += y;
+    }
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = A(23).x
+    if (a != 23) return "fail: primary constructor: $a"
+
+    val b = A(40, 2).x
+    if (b != 42) return "fail: secondary constructor: $b"
+
+    val c = B(99).x
+    if (c != 99) return "fail: native primary constructor: $c"
+
+    val d = B(100, 11).x
+    if (d != 111) return "fail: native secondary constructor: $d"
+
+    /*
+    val (e, f) = foo(123, 320, 1)
+    if (e != 123) return "fail: local primary constructor: $e"
+    if (f != 321) return "fail: local secondary constructor: $f"
+    */
+
+    val g = callPrimaryConstructor(55)
+    if (g != 55) return "fail: primary constructor from inline function: $g"
+
+    val h = callSecondaryConstructor(990, 9)
+    if (h != 999) return "fail: secondary constructor from inline function: $h"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerFile/inheritance.kt

@@ -0,0 +1,29 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1292
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+open class A {
+    fun foo() = 23
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+import lib.A
+
+class B : A() {
+    fun bar() = foo() + 1
+}
+
+fun box(): String {
+    val result = B().bar()
+    if (result != 24) return "fail: $result"
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerFile/inlineModule.kt

@@ -0,0 +1,18 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1283
+// MODULE: lib1
+// FILE: lib1.kt
+
+fun foo() = "OK"
+
+// MODULE: lib2(lib1)
+// FILE: lib2.kt
+
+inline fun bar() = foo()
+
+// MODULE: main(lib1, lib2)
+// FILE: main.kt
+
+fun box() = bar()

js/js.translator/testData/box/esModules/crossModuleRefPerFile/inlineModuleNonIndentifier.kt

@@ -0,0 +1,18 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1283
+// MODULE: 1
+// FILE: lib1.kt
+
+fun foo() = "OK"
+
+// MODULE: 2(1)
+// FILE: lib2.kt
+
+inline fun bar() = foo()
+
+// MODULE: main(2)
+// FILE: main.kt
+
+fun box() = bar()

js/js.translator/testData/box/esModules/crossModuleRefPerFile/lambda.kt

@@ -0,0 +1,21 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1283
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+fun bar(f: () -> String) = f()
+
+inline fun foo(): String {
+    return bar { "OK" }
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box() = foo()

js/js.translator/testData/box/esModules/crossModuleRefPerFile/object.kt

@@ -0,0 +1,39 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1289
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+var log = ""
+
+object O {
+    init {
+        log += "O.init;"
+    }
+
+    fun result() = "OK"
+}
+
+fun getResult(): String {
+    log += "before;"
+    val result = O.result()
+    log += "after;"
+    return result
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val result = getResult()
+    if (result != "OK") return "fail: unexpected result: $result"
+
+    if (log != "before;O.init;after;") return "fail: wrong evaluation order: $log"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerFile/objectInInlineClosure.kt

@@ -0,0 +1,29 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1382
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+object O {
+    val result = "OK"
+
+    inline fun foo(): String {
+        val o = object {
+            fun bar() = O
+        }
+        return fetch(o.bar())
+    }
+}
+
+fun fetch(o: O) = o.result
+
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box() = O.foo()

js/js.translator/testData/box/esModules/crossModuleRefPerFile/objectIsObject.kt

@@ -0,0 +1,23 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1284
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+object O
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    var o: Any = O
+    if (o !is O) return "fail1"
+    if (!(o is O)) return "fail2"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelExtension.kt

@@ -0,0 +1,46 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1290
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+class A(val x: Int)
+
+fun A.foo() = 23 + x
+
+inline fun A.baz() = 99 + x
+
+inline fun A.callFoo() = foo()
+
+inline fun A.buzz(): Int {
+    val o = object {
+        fun f() = 111 + x
+    }
+    return o.f()
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = A(1).foo()
+    if (a != 24) return "fail: simple function: $a"
+
+    val c = A(1).baz()
+    if (c != 100) return "fail: inline function: $c"
+
+    val d = A(1).buzz()
+    if (d != 112) return "fail: inline function with object expression: $d"
+
+    val e = A(2).callFoo()
+    if (e != 25) return "fail: inline function calling another function: $e"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelFunction.kt

@@ -0,0 +1,53 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1287
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+fun foo() = 23
+
+external fun bar(): Int = definedExternally
+
+inline fun baz() = 99
+
+inline fun callFoo() = foo()
+
+inline fun buzz(): Int {
+    val o = object {
+        fun f() = 111
+    }
+    return o.f()
+}
+
+// FILE: lib.js
+
+function bar() {
+    return 42;
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+fun box(): String {
+    val a = lib.foo()
+    if (a != 23) return "fail: simple function: $a"
+
+    val b = lib.bar()
+    if (b != 42) return "fail: native function: $b"
+
+    val c = lib.baz()
+    if (c != 99) return "fail: inline function: $c"
+
+    val d = lib.buzz()
+    if (d != 111) return "fail: inline function with object expression: $d"
+
+    val e = lib.callFoo()
+    if (e != 23) return "fail: inline function calling another function: $e"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelMutableProperty.kt

@@ -0,0 +1,40 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1286
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+var foo = 23
+
+var bar: Int = 42
+    get() = field
+    set(value) {
+        field = value
+    }
+
+@JsName("faz") var baz = 99
+
+// MODULE: main(lib)
+// FILE: lib.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    if (foo != 23) return "fail: simple property initial value: $foo"
+    foo = 24
+    if (foo != 24) return "fail: simple property new value: $foo"
+
+    if (bar != 42) return "fail: property with accessor initial value: $bar"
+    bar = 43
+    if (bar != 43) return "fail: property with accessor new value: $bar"
+
+    if (baz != 99) return "fail: renamed property initial value: $baz"
+    baz = 100
+    if (baz != 100) return "fail: renamed property new value: $baz"
+
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerFile/topLevelProperty.kt

@@ -0,0 +1,50 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_FILE
+// EXPECTED_REACHABLE_NODES: 1287
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+val foo = 23
+
+val boo: Int
+    get() = 42
+
+external val bar: Int = definedExternally
+
+external val far: Int
+    get() = definedExternally
+
+// TODO: annotations like this are not serialized properly. Uncomment after KT-14529 gets fixed
+/*
+val fuzz: Int
+    @JsName("getBuzz") get() = 55
+    */
+
+inline fun fetchFoo() = foo
+
+@JsName("fee")
+val tee = 2525
+
+// FILE: lib.js
+
+var bar = 99
+var far = 111
+
+// MODULE: main(lib)
+// FILE: lib.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    if (foo != 23) return "fail: simple property: $foo"
+    if (boo != 42) return "fail: property with accessor: $boo"
+    if (bar != 99) return "fail: native property: $bar"
+    if (far != 111) return "fail: native property with accessor: $far"
+    //if (fuzz != 55) return "fail: property with JsName on accessor: $fuzz"
+    if (tee != 2525) return "fail: native property with JsName: $tee"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerModule/callableObjectRef.kt

@@ -0,0 +1,29 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1289
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+object O {
+    operator fun invoke() = "OK"
+}
+
+inline fun callO() = O()
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = O()
+    if (a != "OK") return "fail: simple: $a"
+
+    val b = callO()
+    if (b != "OK") return "fail: inline: $a"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerModule/constructor.kt

@@ -0,0 +1,74 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1291
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+class A(val x: Int) {
+    constructor(a: Int, b: Int) : this(a + b)
+}
+
+external class B(x: Int) {
+    constructor(a: Int, b: Int)
+
+    val x: Int
+}
+
+// TODO: may be useful after implementing local classes in inline functions
+/*
+inline fun foo(p: Int, q: Int, r: Int): Pair<Int, Int> {
+    class C(val x : Int) {
+        constructor(a: Int, b: Int) : this(a + b)
+    }
+    return Pair(C(p).x, C(q, r).x)
+}
+*/
+
+inline fun callPrimaryConstructor(x: Int) = A(x).x
+
+inline fun callSecondaryConstructor(x: Int, y: Int) = A(x, y).x
+
+// FILE: lib.js
+
+function B(x, y) {
+    this.x = x;
+    if (typeof y !== 'undefined') {
+        this.x += y;
+    }
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = A(23).x
+    if (a != 23) return "fail: primary constructor: $a"
+
+    val b = A(40, 2).x
+    if (b != 42) return "fail: secondary constructor: $b"
+
+    val c = B(99).x
+    if (c != 99) return "fail: native primary constructor: $c"
+
+    val d = B(100, 11).x
+    if (d != 111) return "fail: native secondary constructor: $d"
+
+    /*
+    val (e, f) = foo(123, 320, 1)
+    if (e != 123) return "fail: local primary constructor: $e"
+    if (f != 321) return "fail: local secondary constructor: $f"
+    */
+
+    val g = callPrimaryConstructor(55)
+    if (g != 55) return "fail: primary constructor from inline function: $g"
+
+    val h = callSecondaryConstructor(990, 9)
+    if (h != 999) return "fail: secondary constructor from inline function: $h"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerModule/inheritance.kt

@@ -0,0 +1,29 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1292
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+open class A {
+    fun foo() = 23
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+import lib.A
+
+class B : A() {
+    fun bar() = foo() + 1
+}
+
+fun box(): String {
+    val result = B().bar()
+    if (result != 24) return "fail: $result"
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerModule/inlineModule.kt

@@ -0,0 +1,18 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1283
+// MODULE: lib1
+// FILE: lib1.kt
+
+fun foo() = "OK"
+
+// MODULE: lib2(lib1)
+// FILE: lib2.kt
+
+inline fun bar() = foo()
+
+// MODULE: main(lib1, lib2)
+// FILE: main.kt
+
+fun box() = bar()

js/js.translator/testData/box/esModules/crossModuleRefPerModule/inlineModuleNonIndentifier.kt

@@ -0,0 +1,18 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1283
+// MODULE: 1
+// FILE: lib1.kt
+
+fun foo() = "OK"
+
+// MODULE: 2(1)
+// FILE: lib2.kt
+
+inline fun bar() = foo()
+
+// MODULE: main(2)
+// FILE: main.kt
+
+fun box() = bar()

js/js.translator/testData/box/esModules/crossModuleRefPerModule/lambda.kt

@@ -0,0 +1,21 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1283
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+fun bar(f: () -> String) = f()
+
+inline fun foo(): String {
+    return bar { "OK" }
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box() = foo()

js/js.translator/testData/box/esModules/crossModuleRefPerModule/object.kt

@@ -0,0 +1,39 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1289
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+var log = ""
+
+object O {
+    init {
+        log += "O.init;"
+    }
+
+    fun result() = "OK"
+}
+
+fun getResult(): String {
+    log += "before;"
+    val result = O.result()
+    log += "after;"
+    return result
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    val result = getResult()
+    if (result != "OK") return "fail: unexpected result: $result"
+
+    if (log != "before;O.init;after;") return "fail: wrong evaluation order: $log"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerModule/objectInInlineClosure.kt

@@ -0,0 +1,29 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1382
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+object O {
+    val result = "OK"
+
+    inline fun foo(): String {
+        val o = object {
+            fun bar() = O
+        }
+        return fetch(o.bar())
+    }
+}
+
+fun fetch(o: O) = o.result
+
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box() = O.foo()

js/js.translator/testData/box/esModules/crossModuleRefPerModule/objectIsObject.kt

@@ -0,0 +1,23 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1284
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+object O
+
+// MODULE: main(lib)
+// FILE: main.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    var o: Any = O
+    if (o !is O) return "fail1"
+    if (!(o is O)) return "fail2"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelExtension.kt

@@ -0,0 +1,46 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1290
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+class A(val x: Int)
+
+fun A.foo() = 23 + x
+
+inline fun A.baz() = 99 + x
+
+inline fun A.callFoo() = foo()
+
+inline fun A.buzz(): Int {
+    val o = object {
+        fun f() = 111 + x
+    }
+    return o.f()
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+import lib.*
+
+fun box(): String {
+    val a = A(1).foo()
+    if (a != 24) return "fail: simple function: $a"
+
+    val c = A(1).baz()
+    if (c != 100) return "fail: inline function: $c"
+
+    val d = A(1).buzz()
+    if (d != 112) return "fail: inline function with object expression: $d"
+
+    val e = A(2).callFoo()
+    if (e != 25) return "fail: inline function calling another function: $e"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelFunction.kt

@@ -0,0 +1,53 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1287
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+fun foo() = 23
+
+external fun bar(): Int = definedExternally
+
+inline fun baz() = 99
+
+inline fun callFoo() = foo()
+
+inline fun buzz(): Int {
+    val o = object {
+        fun f() = 111
+    }
+    return o.f()
+}
+
+// FILE: lib.js
+
+function bar() {
+    return 42;
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+package main
+
+fun box(): String {
+    val a = lib.foo()
+    if (a != 23) return "fail: simple function: $a"
+
+    val b = lib.bar()
+    if (b != 42) return "fail: native function: $b"
+
+    val c = lib.baz()
+    if (c != 99) return "fail: inline function: $c"
+
+    val d = lib.buzz()
+    if (d != 111) return "fail: inline function with object expression: $d"
+
+    val e = lib.callFoo()
+    if (e != 23) return "fail: inline function calling another function: $e"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelMutableProperty.kt

@@ -0,0 +1,40 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1286
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+var foo = 23
+
+var bar: Int = 42
+    get() = field
+    set(value) {
+        field = value
+    }
+
+@JsName("faz") var baz = 99
+
+// MODULE: main(lib)
+// FILE: lib.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    if (foo != 23) return "fail: simple property initial value: $foo"
+    foo = 24
+    if (foo != 24) return "fail: simple property new value: $foo"
+
+    if (bar != 42) return "fail: property with accessor initial value: $bar"
+    bar = 43
+    if (bar != 43) return "fail: property with accessor new value: $bar"
+
+    if (baz != 99) return "fail: renamed property initial value: $baz"
+    baz = 100
+    if (baz != 100) return "fail: renamed property new value: $baz"
+
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/crossModuleRefPerModule/topLevelProperty.kt

@@ -0,0 +1,50 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+// SPLIT_PER_MODULE
+// EXPECTED_REACHABLE_NODES: 1287
+// MODULE: lib
+// FILE: lib.kt
+package lib
+
+val foo = 23
+
+val boo: Int
+    get() = 42
+
+external val bar: Int = definedExternally
+
+external val far: Int
+    get() = definedExternally
+
+// TODO: annotations like this are not serialized properly. Uncomment after KT-14529 gets fixed
+/*
+val fuzz: Int
+    @JsName("getBuzz") get() = 55
+    */
+
+inline fun fetchFoo() = foo
+
+@JsName("fee")
+val tee = 2525
+
+// FILE: lib.js
+
+var bar = 99
+var far = 111
+
+// MODULE: main(lib)
+// FILE: lib.kt
+package main
+
+import lib.*
+
+fun box(): String {
+    if (foo != 23) return "fail: simple property: $foo"
+    if (boo != 42) return "fail: property with accessor: $boo"
+    if (bar != 99) return "fail: native property: $bar"
+    if (far != 111) return "fail: native property with accessor: $far"
+    //if (fuzz != 55) return "fail: property with JsName on accessor: $fuzz"
+    if (tee != 2525) return "fail: native property with JsName: $tee"
+
+    return "OK"
+}

js/js.translator/testData/box/esModules/export/exportAllFile.kt

@@ -0,0 +1,23 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// EXPECTED_REACHABLE_NODES: 1252
+// INFER_MAIN_MODULE
+// ES_MODULES
+
+// MODULE: export-all-file
+// FILE: lib.kt
+@file:JsExport
+
+abstract class A {
+    abstract fun foo(k: String): String
+}
+
+class B : A() {
+    override fun foo(k: String): String {
+        return "O" + k
+    }
+}
+
+// FILE: entry.mjs
+// ENTRY_ES_MODULE
+import { B } from "./export-all-file/index.js";
+console.assert(new B().foo("K") == "OK");

js/js.translator/testData/box/esModules/export/nonIndetifierModuleName.kt

@@ -0,0 +1,16 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// SKIP_MINIFICATION
+// INFER_MAIN_MODULE
+// SKIP_NODE_JS
+// ES_MODULES
+
+// MODULE: non-identifier-module-name
+// FILE: lib.kt
+@JsName("foo")
+@JsExport
+public fun foo(k: String): String = "O$k"
+
+// FILE: entry.mjs
+// ENTRY_ES_MODULE
+import { foo } from "./non-identifier-module-name/index.js";
+console.assert(foo("K") == "OK");

js/js.translator/testData/box/esModules/export/overriddenChainNonExportIntermediate.kt

@@ -0,0 +1,39 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// EXPECTED_REACHABLE_NODES: 1252
+// INFER_MAIN_MODULE
+
+// ES_MODULES
+// MODULE: overriden-chain-non-export-intermediate
+// FILE: lib.kt
+@JsExport
+abstract class A {
+    abstract fun foo(): String
+
+    abstract fun bar(): String
+}
+
+abstract class B : A() {
+    abstract fun baz(): String
+
+    override fun foo(): String = "foo"
+}
+
+@JsExport
+class C : B() {
+    override fun bar(): String = "bar"
+    override fun baz(): String = "baz"
+
+    fun bay(): String = "bay"
+}
+
+// FILE: entry.mjs
+// ENTRY_ES_MODULE
+import { C } from "./overriden-chain-non-export-intermediate/index.js";
+
+function test(c) {
+    if (c.foo() === "foo" && c.bar() === "bar" && c.bay() == "bay") return "OK"
+
+    return "fail"
+}
+
+console.assert(test(new C()) == "OK");

js/js.translator/testData/box/esModules/export/overriddenExternalMethodWithSameNameMethod.kt

@@ -0,0 +1,41 @@
+// EXPECTED_REACHABLE_NODES: 1252
+// INFER_MAIN_MODULE
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+
+// MODULE: overriden-external-method-with-same-name-method
+// FILE: lib.kt
+external abstract class Foo {
+    abstract fun o(): String
+}
+
+abstract class Bar : Foo() {
+    abstract fun String.o(): String
+
+    override fun o(): String {
+        return "O".o()
+    }
+}
+
+@JsExport
+class Baz : Bar() {
+    override fun String.o(): String {
+        return this
+    }
+}
+
+// FILE: foo.js
+function Foo() {}
+Foo.prototype.k = function() {
+    return "K"
+}
+
+// FILE: entry.mjs
+// ENTRY_ES_MODULE
+import { Baz } from "./overriden-external-method-with-same-name-method/index.js";
+
+function test(foo) {
+    return foo.o() + foo.k()
+}
+
+console.assert(test(new Baz())  == "OK");

js/js.translator/testData/box/esModules/export/overriddenExternalMethodWithSameStableNameMethod.kt

@@ -0,0 +1,44 @@
+// EXPECTED_REACHABLE_NODES: 1252
+// IGNORE_BACKEND: JS
+// INFER_MAIN_MODULE
+// ES_MODULES
+
+// MODULE: overriden-external-method-with-same-stable-name-method
+// FILE: lib.kt
+external abstract class Foo {
+    abstract fun o(): String
+}
+
+abstract class Bar : Foo() {
+    @JsName("oStable")
+    abstract fun String.o(): String
+
+    override fun o(): String {
+        return "O".o()
+    }
+}
+
+@JsExport
+class Baz : Bar() {
+    override fun String.o(): String {
+        return this
+    }
+}
+
+// FILE: foo.js
+function Foo() {}
+Foo.prototype.k = function() {
+    return "K"
+}
+
+// FILE: entry.mjs
+// ENTRY_ES_MODULE
+import { Baz } from "./overriden-external-method-with-same-stable-name-method/index.js";
+
+function test(foo) {
+    const oStable = foo.oStable("OK")
+    if (oStable !== "OK") return "false: " + oStable
+    return foo.o() + foo.k()
+}
+
+console.assert(test(new Baz()) == "OK");

js/js.translator/testData/box/esModules/export/reservedModuleName.kt

@@ -0,0 +1,17 @@
+// IGNORE_BACKEND: JS
+// EXPECTED_REACHABLE_NODES: 1270
+// SKIP_MINIFICATION
+// INFER_MAIN_MODULE
+// ES_MODULES
+
+// MODULE: if
+// FILE: lib.kt
+@JsName("foo")
+@JsExport
+public fun foo(k: String): String = "O$k"
+
+// FILE: entry.mjs
+// ENTRY_ES_MODULE
+import { foo } from "./if/index.js";
+
+console.assert(foo("K") == "OK");

js/js.translator/testData/box/esModules/incremental/jsModule.kt

@@ -0,0 +1,41 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+
+// MODULE: lib
+// FILE: a.kt
+@file:JsModule("./foo.mjs")
+
+external fun fooF(): String
+
+// FILE: b.kt
+@file:JsModule("./bar.mjs")
+
+external fun barF(): String
+
+// FILE: c.kt
+// RECOMPILE
+fun dummyF() = "dummy"
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+fun box(): String {
+    val foo = fooF()
+    if (foo != "foo") return "fail1: $foo"
+
+    val bar = barF()
+    if (bar != "bar") return "fail2: $bar"
+
+    return "OK"
+}
+
+
+// FILE: foo.mjs
+export function fooF() {
+    return "foo";
+}
+
+// FILE: bar.mjs
+export function barF() {
+    return "bar";
+}

js/js.translator/testData/box/esModules/inline/inlinedObjectLiteralIsCheck.kt

@@ -0,0 +1,35 @@
+// DONT_TARGET_EXACT_BACKEND: JS
+// ES_MODULES
+
+// FILE: main.kt
+interface I {
+    fun ok(): String
+}
+
+inline fun ok(): I {
+    return object : I {
+        override fun ok() = "OK"
+    }
+}
+
+@JsName("convolutedOk")
+@JsExport
+inline fun convolutedOk(): I {
+    val fail = object : I {
+        override fun ok() = "fail"
+    }.ok()
+
+    return ok()
+}
+
+@JsExport
+fun testOk(ok: Any): String {
+    if (ok !is I) return "fail"
+    return ok.ok()
+}
+
+// FILE: entry.mjs
+// ENTRY_ES_MODULE
+import { convolutedOk, testOk } from "./JS_TESTS/index.js";
+
+console.assert(testOk(convolutedOk()) == "OK");