[K/JS] Remove trivial JS constructors from JS AST

js/js.inliner/src/org/jetbrains/kotlin/js/inline/clean/ClassPostProcessor.kt

@@ -20,7 +20,7 @@ import org.jetbrains.kotlin.js.backend.ast.JsClass
 
 class ClassPostProcessor(val root: JsClass) {
     val optimizations = listOf(
-        { EmptyConstructorRemoval(root).apply() }
+        { TrivialConstructorRemoval(root).apply() }
     )
 
     fun apply() {

js/js.inliner/src/org/jetbrains/kotlin/js/inline/clean/EmptyConstructorRemoval.kt

@@ -1,16 +0,0 @@
-/*
- * Copyright 2010-2023 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.inline.clean
-
-import org.jetbrains.kotlin.js.backend.ast.JsClass
-
-class EmptyConstructorRemoval(private val klass: JsClass) {
-    fun apply(): Boolean {
-        if (klass.constructor?.body?.statements?.isEmpty() != true) return false
-        klass.constructor = null
-        return true
-    }
-}

js/js.inliner/src/org/jetbrains/kotlin/js/inline/clean/TrivialConstructorRemoval.kt

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2010-2023 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.inline.clean
+
+import org.jetbrains.kotlin.js.backend.ast.JsClass
+import org.jetbrains.kotlin.js.backend.ast.JsExpressionStatement
+import org.jetbrains.kotlin.js.backend.ast.JsFunction
+import org.jetbrains.kotlin.js.backend.ast.JsInvocation
+import org.jetbrains.kotlin.js.backend.ast.JsNameRef
+import org.jetbrains.kotlin.js.backend.ast.JsSuperRef
+
+class TrivialConstructorRemoval(private val klass: JsClass) {
+    fun apply(): Boolean {
+        if (klass.constructor?.isTrivial() != true) return false
+        klass.constructor = null
+        return true
+    }
+
+    private fun JsFunction.isTrivial(): Boolean {
+        return body.statements.all { statement ->
+            val expressionStatement = statement as? JsExpressionStatement
+            val invocation = expressionStatement?.expression as? JsInvocation
+            invocation?.qualifier is JsSuperRef && invocation.arguments.size == parameters.size && invocation.arguments.withIndex()
+                .all { (index, argument) -> argument is JsNameRef && argument.name === parameters[index].name }
+        }
+    }
+}