[Gradle][Minor] Move Kotlin2JsPlugin into separate source file

KT-54312

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/Kotlin2JsPlugin.kt

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2010-2022 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.gradle.plugin
+
+import org.gradle.api.Project
+import org.gradle.tooling.provider.model.ToolingModelBuilderRegistry
+import org.jetbrains.kotlin.gradle.dsl.*
+import org.jetbrains.kotlin.gradle.dsl.CompilerJsOptionsDefault
+import org.jetbrains.kotlin.gradle.plugin.mpp.AbstractKotlinCompilation
+import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinWithJavaTarget
+import org.jetbrains.kotlin.gradle.tasks.KotlinTasksProvider
+
+@Deprecated(
+    message = "Should be removed with Js platform plugin",
+    level = DeprecationLevel.ERROR
+)
+internal open class Kotlin2JsPlugin(
+    registry: ToolingModelBuilderRegistry
+) : AbstractKotlinPlugin(KotlinTasksProvider(), registry) {
+
+    companion object {
+        private const val targetName = "2Js"
+    }
+
+    override fun buildSourceSetProcessor(
+        project: Project,
+        compilation: AbstractKotlinCompilation<*>
+    ): KotlinSourceSetProcessor<*> =
+        Kotlin2JsSourceSetProcessor(tasksProvider, compilation)
+
+    override fun apply(project: Project) {
+        @Suppress("UNCHECKED_CAST")
+        val target = project.objects.newInstance(
+            KotlinWithJavaTarget::class.java,
+            project,
+            KotlinPlatformType.js,
+            targetName,
+            {
+                object : HasCompilerOptions<CompilerJsOptions> {
+                    override val options: CompilerJsOptions =
+                        project.objects.newInstance(CompilerJsOptionsDefault::class.java)
+                }
+            },
+            { compilerOptions: CompilerJsOptions ->
+                object : KotlinJsOptions {
+                    override val options: CompilerJsOptions
+                        get() = compilerOptions
+                }
+            }
+        ) as KotlinWithJavaTarget<KotlinJsOptions, CompilerJsOptions>
+
+        (project.kotlinExtension as Kotlin2JsProjectExtension).setTarget(target)
+        super.apply(project)
+    }
+}

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt

@@ -80,50 +80,6 @@ internal open class KotlinPlugin(
     }
 }
 
-@Deprecated(
-    message = "Should be removed with Js platform plugin",
-    level = DeprecationLevel.ERROR
-)
-internal open class Kotlin2JsPlugin(
-    registry: ToolingModelBuilderRegistry
-) : AbstractKotlinPlugin(KotlinTasksProvider(), registry) {
-
-    companion object {
-        private const val targetName = "2Js"
-    }
-
-    override fun buildSourceSetProcessor(
-        project: Project,
-        compilation: AbstractKotlinCompilation<*>
-    ): KotlinSourceSetProcessor<*> =
-        Kotlin2JsSourceSetProcessor(tasksProvider, compilation)
-
-    override fun apply(project: Project) {
-        @Suppress("UNCHECKED_CAST")
-        val target = project.objects.newInstance(
-            KotlinWithJavaTarget::class.java,
-            project,
-            KotlinPlatformType.js,
-            targetName,
-            {
-                object : HasCompilerOptions<KotlinJsCompilerOptions> {
-                    override val options: KotlinJsCompilerOptions =
-                        project.objects.newInstance(KotlinJsCompilerOptionsDefault::class.java)
-                }
-            },
-            { compilerOptions: KotlinJsCompilerOptions ->
-                object : KotlinJsOptions {
-                    override val options: KotlinJsCompilerOptions
-                        get() = compilerOptions
-                }
-            }
-        ) as KotlinWithJavaTarget<KotlinJsOptions, KotlinJsCompilerOptions>
-
-        (project.kotlinExtension as Kotlin2JsProjectExtension).setTarget(target)
-        super.apply(project)
-    }
-}
-
 internal open class KotlinAndroidPlugin(
     private val registry: ToolingModelBuilderRegistry
 ) : Plugin<Project> {