diff --git a/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt b/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt
index 3ab3df2ed30..428c0be0b9b 100644
--- a/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt
+++ b/compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt
@@ -176,6 +176,9 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xir-per-file", description = "Splits generated .js per-file")
     var irPerFile: Boolean by FreezableVar(false)
 
+    @Argument(value = "-Xir-new-ir2js", description = "New fragment-based ir2js")
+    var irNewIr2Js: Boolean by FreezableVar(false)
+
     @Argument(
         value = "-Xinclude",
         valueDescription = "<path>",
diff --git a/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt b/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt
index a92ff8abceb..728d8c1b88c 100644
--- a/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt
+++ b/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt
@@ -43,6 +43,7 @@ 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.backend.js.transformers.irToJs.IrModuleToJsTransformerTmp
 import org.jetbrains.kotlin.ir.declarations.persistent.PersistentIrFactory
 import org.jetbrains.kotlin.js.analyzer.JsAnalysisResult
 import org.jetbrains.kotlin.js.config.*
@@ -381,16 +382,29 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
                 granularity = granularity
             )
 
-            val transformer = IrModuleToJsTransformer(
-                ir.context,
-                mainCallArguments,
-                fullJs = true,
-                dceJs = arguments.irDce,
-                multiModule = arguments.irPerModule,
-                relativeRequirePath = false,
-                generateGlobalThisPolyfill = configuration.languageVersionSettings.supportsFeature(LanguageFeature.JsAllowInvalidCharsIdentifiersEscaping)
-            )
-            val compiledModule: CompilerResult = transformer.generateModule(ir.allModules)
+            val compiledModule: CompilerResult = if (arguments.irNewIr2Js) {
+                val transformer = IrModuleToJsTransformerTmp(
+                    ir.context,
+                    mainCallArguments,
+                    fullJs = true,
+                    dceJs = arguments.irDce,
+                    multiModule = arguments.irPerModule,
+                    relativeRequirePath = false,
+                )
+
+                transformer.generateModule(ir.allModules)
+            } else {
+                val transformer = IrModuleToJsTransformer(
+                    ir.context,
+                    mainCallArguments,
+                    fullJs = true,
+                    dceJs = arguments.irDce,
+                    multiModule = arguments.irPerModule,
+                    relativeRequirePath = false
+                )
+
+                transformer.generateModule(ir.allModules)
+            }
 
             messageCollector.report(INFO, "Executable production duration: ${System.currentTimeMillis() - start}ms")
 
diff --git a/compiler/testData/cli/js/jsExtraHelp.out b/compiler/testData/cli/js/jsExtraHelp.out
index ec445738014..fd5916c22c3 100644
--- a/compiler/testData/cli/js/jsExtraHelp.out
+++ b/compiler/testData/cli/js/jsExtraHelp.out
@@ -19,6 +19,7 @@ where advanced options include:
   -Xir-dce-runtime-diagnostic={log|exception}
                              Enable runtime diagnostics when performing DCE instead of removing declarations
   -Xir-module-name=<name>    Specify a compilation module name for IR backend
+  -Xir-new-ir2js             New fragment-based ir2js
   -Xir-only                  Disables pre-IR backend
   -Xir-per-file              Splits generated .js per-file
   -Xir-per-module            Splits generated .js per-module
diff --git a/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/directives/JsEnvironmentConfigurationDirectives.kt b/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/directives/JsEnvironmentConfigurationDirectives.kt
index 452d5fb3f53..ed1c076cd9c 100644
--- a/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/directives/JsEnvironmentConfigurationDirectives.kt
+++ b/compiler/tests-common-new/tests/org/jetbrains/kotlin/test/directives/JsEnvironmentConfigurationDirectives.kt
@@ -234,4 +234,9 @@ object JsEnvironmentConfigurationDirectives : SimpleDirectivesContainer() {
         description = "",
         applicability = DirectiveApplicability.Global
     )
+
+    val RUN_NEW_IR_2_JS by directive(
+        description = "",
+        applicability = DirectiveApplicability.Global
+    )
 }
diff --git a/js/js.tests/test/org/jetbrains/kotlin/js/test/converters/JsIrBackendFacade.kt b/js/js.tests/test/org/jetbrains/kotlin/js/test/converters/JsIrBackendFacade.kt
index 931fe0591fc..ce2674b1687 100644
--- a/js/js.tests/test/org/jetbrains/kotlin/js/test/converters/JsIrBackendFacade.kt
+++ b/js/js.tests/test/org/jetbrains/kotlin/js/test/converters/JsIrBackendFacade.kt
@@ -133,19 +133,34 @@ class JsIrBackendFacade(
             .run { if (shouldBeGenerated()) arguments() else null }
         val runIrDce = JsEnvironmentConfigurationDirectives.RUN_IR_DCE in module.directives
         val esModules = JsEnvironmentConfigurationDirectives.ES_MODULES in module.directives
+        val runNewIr2Js = JsEnvironmentConfigurationDirectives.RUN_NEW_IR_2_JS in module.directives
 
         val outputFile = File(JsEnvironmentConfigurator.getJsModuleArtifactPath(testServices, module.name) + ".js")
         val dceOutputFile = File(JsEnvironmentConfigurator.getDceJsArtifactPath(testServices, module.name) + ".js")
         if (!esModules) {
-            val transformer = IrModuleToJsTransformerTmp(
-                loweredIr.context,
-                mainArguments,
-                fullJs = true,
-                dceJs = runIrDce,
-                multiModule = granularity == JsGenerationGranularity.PER_MODULE,
-                relativeRequirePath = false
-            )
-            return BinaryArtifacts.Js.JsIrArtifact(outputFile, transformer.generateModule(loweredIr.allModules)).dump(module)
+            if (runNewIr2Js) {
+                val transformer = IrModuleToJsTransformerTmp(
+                    loweredIr.context,
+                    mainArguments,
+                    fullJs = true,
+                    dceJs = runIrDce,
+                    multiModule = granularity == JsGenerationGranularity.PER_MODULE,
+                    relativeRequirePath = false
+                )
+
+                return BinaryArtifacts.Js.JsIrArtifact(outputFile, transformer.generateModule(loweredIr.allModules)).dump(module)
+            } else {
+                val transformer = IrModuleToJsTransformer(
+                    loweredIr.context,
+                    mainArguments,
+                    fullJs = true,
+                    dceJs = runIrDce,
+                    multiModule = granularity == JsGenerationGranularity.PER_MODULE,
+                    relativeRequirePath = false
+                )
+
+                return BinaryArtifacts.Js.JsIrArtifact(outputFile, transformer.generateModule(loweredIr.allModules)).dump(module)
+            }
         }
 
         val options = JsGenerationOptions(generatePackageJson = true, generateTypeScriptDefinitions = generateDts)
diff --git a/js/js.tests/test/org/jetbrains/kotlin/js/test/ir/AbstractJsIrTest.kt b/js/js.tests/test/org/jetbrains/kotlin/js/test/ir/AbstractJsIrTest.kt
index d3a29ad8fa9..79f13606da6 100644
--- a/js/js.tests/test/org/jetbrains/kotlin/js/test/ir/AbstractJsIrTest.kt
+++ b/js/js.tests/test/org/jetbrains/kotlin/js/test/ir/AbstractJsIrTest.kt
@@ -57,6 +57,7 @@ abstract class AbstractJsIrTest(
                 if (getBoolean("kotlin.js.ir.klibMainModule")) +JsEnvironmentConfigurationDirectives.KLIB_MAIN_MODULE
                 if (getBoolean("kotlin.js.ir.perModule")) +JsEnvironmentConfigurationDirectives.PER_MODULE
                 if (getBoolean("kotlin.js.ir.dce", true)) +JsEnvironmentConfigurationDirectives.RUN_IR_DCE
+                if (getBoolean("kotlin.js.ir.newIr2Js", false)) +JsEnvironmentConfigurationDirectives.RUN_NEW_IR_2_JS
             }
 
             configureJsArtifactsHandlersStep {