diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt
index b2794736a76..7a5f04e2c56 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsLoweringPhases.kt
@@ -709,6 +709,86 @@ val loweringList = listOf<Lowering>(
     validateIrAfterLowering
 )
 
+val es6LoweringList = listOf<Lowering>(
+    scriptRemoveReceiverLowering,
+    validateIrBeforeLowering,
+    testGenerationPhase,
+    expectDeclarationsRemovingPhase,
+    stripTypeAliasDeclarationsPhase,
+    arrayConstructorPhase,
+    lateinitNullableFieldsPhase,
+    lateinitDeclarationLoweringPhase,
+    lateinitUsageLoweringPhase,
+    sharedVariablesLoweringPhase,
+    localClassesInInlineLambdasPhase,
+    localClassesInInlineFunctionsPhase,
+    localClassesExtractionFromInlineFunctionsPhase,
+    functionInliningPhase,
+    copyInlineFunctionBodyLoweringPhase,
+    createScriptFunctionsPhase,
+    callableReferenceLowering,
+    singleAbstractMethodPhase,
+    tailrecLoweringPhase,
+    enumClassConstructorLoweringPhase,
+    enumClassConstructorBodyLoweringPhase,
+    localDelegatedPropertiesLoweringPhase,
+    localDeclarationsLoweringPhase,
+    localClassExtractionPhase,
+    innerClassesLoweringPhase,
+    innerClassesMemberBodyLoweringPhase,
+    innerClassConstructorCallsLoweringPhase,
+    propertiesLoweringPhase,
+    primaryConstructorLoweringPhase,
+    delegateToPrimaryConstructorLoweringPhase,
+    annotationConstructorLowering,
+    initializersLoweringPhase,
+    initializersCleanupLoweringPhase,
+    kotlinNothingValueExceptionPhase,
+    // Common prefix ends
+    enumEntryInstancesLoweringPhase,
+    enumEntryInstancesBodyLoweringPhase,
+    enumClassCreateInitializerLoweringPhase,
+    enumEntryCreateGetInstancesFunsLoweringPhase,
+    enumSyntheticFunsLoweringPhase,
+    enumUsageLoweringPhase,
+    enumEntryRemovalLoweringPhase,
+    suspendFunctionsLoweringPhase,
+    propertyReferenceLoweringPhase,
+    interopCallableReferenceLoweringPhase,
+    returnableBlockLoweringPhase,
+    forLoopsLoweringPhase,
+    primitiveCompanionLoweringPhase,
+    propertyAccessorInlinerLoweringPhase,
+    foldConstantLoweringPhase,
+    privateMembersLoweringPhase,
+    privateMemberUsagesLoweringPhase,
+    defaultArgumentStubGeneratorPhase,
+    defaultArgumentPatchOverridesPhase,
+    defaultParameterInjectorPhase,
+    defaultParameterCleanerPhase,
+    jsDefaultCallbackGeneratorPhase,
+    removeInlineFunctionsWithReifiedTypeParametersLoweringPhase,
+    throwableSuccessorsLoweringPhase,
+    es6AddInternalParametersToConstructorPhase,
+    es6ConstructorLowering,
+    varargLoweringPhase,
+    multipleCatchesLoweringPhase,
+    bridgesConstructionPhase,
+    typeOperatorLoweringPhase,
+    secondaryFactoryInjectorLoweringPhase,
+    classReferenceLoweringPhase,
+    inlineClassDeclarationLoweringPhase,
+    inlineClassUsageLoweringPhase,
+    autoboxingTransformerPhase,
+    blockDecomposerLoweringPhase,
+    constLoweringPhase,
+    objectDeclarationLoweringPhase,
+    objectUsageLoweringPhase,
+    callsLoweringPhase,
+    cleanupLoweringPhase,
+    validateIrAfterLowering
+)
+
 // TODO comment? Eliminate MouduleLowering's? Don't filter them here?
 val pirLowerings = loweringList.filter { it is DeclarationLowering || it is BodyLowering } + staticMembersLoweringPhase
 
@@ -719,4 +799,12 @@ val jsPhases = namedIrModulePhase(
     lower = loweringList.drop(1).fold(loweringList[0].modulePhase) { acc: CompilerPhase<JsIrBackendContext, IrModuleFragment, IrModuleFragment>, lowering ->
         acc.then(lowering.modulePhase)
     }
-)
\ No newline at end of file
+)
+
+val jsEs6Phases = namedIrModulePhase(
+    name = "ES6IrModuleLowering",
+    description = "ES6 IR module lowering",
+    lower = es6LoweringList.drop(1).fold(es6LoweringList[0].modulePhase) { acc: CompilerPhase<JsIrBackendContext, IrModuleFragment, IrModuleFragment>, lowering ->
+        acc.then(lowering.modulePhase)
+    }
+)
diff --git a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/compiler.kt b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/compiler.kt
index 51267fd08a0..a557184f5cc 100644
--- a/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/compiler.kt
+++ b/compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/compiler.kt
@@ -98,7 +98,8 @@ fun compile(
         val transformer = IrModuleToJsTransformer(context, mainFunction, mainArguments)
         return transformer.generateModule(moduleFragment, fullJs = true, dceJs = false)
     } else {
-        jsPhases.invokeToplevel(phaseConfig, context, moduleFragment)
+        val phases = if (es6mode) jsEs6Phases else jsPhases
+        phases.invokeToplevel(phaseConfig, context, moduleFragment)
         val transformer = IrModuleToJsTransformer(context, mainFunction, mainArguments)
         return transformer.generateModule(moduleFragment, generateFullJs, generateDceJs)
     }