diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/ResolvePhaseUtils.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/ResolvePhaseUtils.kt
index 4986fc81287..506b7ea9c37 100644
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/ResolvePhaseUtils.kt
+++ b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/ResolvePhaseUtils.kt
@@ -12,7 +12,6 @@ import org.jetbrains.kotlin.fir.resolve.ScopeSession
 import org.jetbrains.kotlin.fir.resolve.transformers.body.resolve.FirBodyResolveTransformerAdapter
 import org.jetbrains.kotlin.fir.resolve.transformers.body.resolve.FirImplicitTypeBodyResolveTransformerAdapter
 import org.jetbrains.kotlin.fir.resolve.transformers.contracts.FirContractResolveTransformerAdapter
-import org.jetbrains.kotlin.fir.resolve.transformers.plugin.FirFirstGenerationTransformer
 import org.jetbrains.kotlin.fir.resolve.transformers.plugin.FirPluginAnnotationsResolveTransformer
 import org.jetbrains.kotlin.fir.visitors.FirTransformer
 
@@ -22,7 +21,7 @@ fun FirResolvePhase.createTransformerByPhase(session: FirSession, scopeSession:
     return when (this) {
         RAW_FIR -> throw AssertionError("Raw FIR building phase does not have a transformer")
         ANNOTATIONS_FOR_PLUGINS -> FirPluginAnnotationsResolveTransformer(session, scopeSession)
-        FIRST_PLUGIN_GENERATION -> FirFirstGenerationTransformer()
+//        FIRST_PLUGIN_GENERATION -> FirFirstGenerationTransformer()
         IMPORTS -> FirImportResolveTransformer(session)
         SUPER_TYPES -> FirSupertypeResolverTransformer(session, scopeSession)
         SEALED_CLASS_INHERITORS -> FirSealedClassInheritorsTransformer()
diff --git a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/plugin/FirFirstGenerationTransformer.kt b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/plugin/FirFirstGenerationTransformer.kt
deleted file mode 100644
index 5672594daca..00000000000
--- a/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/plugin/FirFirstGenerationTransformer.kt
+++ /dev/null
@@ -1,104 +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.fir.resolve.transformers.plugin
-
-import org.jetbrains.kotlin.fir.FirAnnotationContainer
-import org.jetbrains.kotlin.fir.FirElement
-import org.jetbrains.kotlin.fir.FirSession
-import org.jetbrains.kotlin.fir.declarations.*
-import org.jetbrains.kotlin.fir.expressions.FirStatement
-import org.jetbrains.kotlin.fir.extensions.FirClassGenerationExtension
-import org.jetbrains.kotlin.fir.extensions.classGenerationExtensions
-import org.jetbrains.kotlin.fir.extensions.oldExtensionsService
-import org.jetbrains.kotlin.fir.extensions.hasExtensions
-import org.jetbrains.kotlin.fir.visitors.CompositeTransformResult
-import org.jetbrains.kotlin.fir.visitors.FirDefaultTransformer
-import org.jetbrains.kotlin.fir.visitors.compose
-
-class FirFirstGenerationTransformer : FirDefaultTransformer<Nothing?>() {
-    private lateinit var session: FirSession
-    private val generatedDeclarations: MutableList<FirClassGenerationExtension.GeneratedClass> = mutableListOf()
-    private lateinit var file: FirFile
-    private val extensionPointService get() = session.oldExtensionsService
-
-    override fun transformFile(file: FirFile, data: Nothing?): CompositeTransformResult<FirDeclaration> {
-        session = file.session
-        if (!extensionPointService.hasExtensions) return file.compose()
-        file.replaceResolvePhase(FirResolvePhase.FIRST_PLUGIN_GENERATION)
-        generatedDeclarations.clear()
-        this.file = file
-
-        file.transformDeclarations(this, data)
-        visitAnnotatedDeclaration(file)
-        addGeneratedClasses()
-        return file.compose()
-    }
-
-    private fun addGeneratedClasses() {
-        for ((generatedClass, owner) in generatedDeclarations) {
-            when (owner) {
-                is FirFile -> owner.addDeclaration(generatedClass)
-                is FirRegularClass -> owner.addDeclaration(generatedClass)
-                else -> throw IllegalStateException()
-            }
-        }
-    }
-
-    private fun <T> visitAnnotatedDeclaration(declaration: T) where T : FirDeclaration, T : FirAnnotationContainer {
-        val extensions = extensionPointService.classGenerationExtensions.forDeclaration(declaration, emptyList())
-        extensions.flatMapTo(generatedDeclarations) { it.generateClass(file, declaration) }
-    }
-
-    override fun transformProperty(property: FirProperty, data: Nothing?): CompositeTransformResult<FirDeclaration> {
-        visitAnnotatedDeclaration(property)
-        return property.compose()
-    }
-
-    override fun transformRegularClass(
-        regularClass: FirRegularClass,
-        data: Nothing?
-    ): CompositeTransformResult<FirStatement> {
-        regularClass.transformDeclarations(this, data)
-        regularClass.transformCompanionObject(this, data)
-        visitAnnotatedDeclaration(regularClass)
-        return regularClass.compose()
-    }
-
-    override fun transformSimpleFunction(
-        simpleFunction: FirSimpleFunction,
-        data: Nothing?
-    ): CompositeTransformResult<FirDeclaration> {
-        simpleFunction.transformValueParameters(this, data)
-        visitAnnotatedDeclaration(simpleFunction)
-        return simpleFunction.compose()
-    }
-
-    override fun transformConstructor(
-        constructor: FirConstructor,
-        data: Nothing?
-    ): CompositeTransformResult<FirDeclaration> {
-        constructor.transformValueParameters(this, data)
-        visitAnnotatedDeclaration(constructor)
-        return constructor.compose()
-    }
-
-    override fun transformValueParameter(
-        valueParameter: FirValueParameter,
-        data: Nothing?
-    ): CompositeTransformResult<FirStatement> {
-        visitAnnotatedDeclaration(valueParameter)
-        return valueParameter.compose()
-    }
-
-    override fun transformTypeAlias(typeAlias: FirTypeAlias, data: Nothing?): CompositeTransformResult<FirDeclaration> {
-        visitAnnotatedDeclaration(typeAlias)
-        return typeAlias.compose()
-    }
-
-    override fun <E : FirElement> transformElement(element: E, data: Nothing?): CompositeTransformResult<E> {
-        return element.compose()
-    }
-}
\ No newline at end of file
diff --git a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirResolvePhase.kt b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirResolvePhase.kt
index b1c170bf7a8..2d8f32542e3 100644
--- a/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirResolvePhase.kt
+++ b/compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirResolvePhase.kt
@@ -8,7 +8,7 @@ package org.jetbrains.kotlin.fir.declarations
 enum class FirResolvePhase {
     RAW_FIR,
     ANNOTATIONS_FOR_PLUGINS, // run only if some extensions are registered
-    FIRST_PLUGIN_GENERATION, // plugin phase
+//    FIRST_PLUGIN_GENERATION, // plugin phase
     IMPORTS,
     SUPER_TYPES,
     SEALED_CLASS_INHERITORS,