JS: allow to omit delegated constructor call for external classes in common FE. Prohibit delegated constructor call for external classes in JS FE.

compiler/testData/diagnostics/testsWithJsStdLib/native/delegatedConstructorCall.kt

@@ -0,0 +1,18 @@
+// !DIAGNOSTICS: -DEBUG_INFO_MISSING_UNRESOLVED
+
+external open class Base(x: Int) {
+    constructor(x: String) : <!EXTERNAL_DELEGATED_CONSTRUCTOR_CALL!>this<!>(23)
+
+    constructor(x: String, y: String) : <!EXTERNAL_DELEGATED_CONSTRUCTOR_CALL!>this<!>("")
+}
+
+external open class Derived1() : Base<!EXTERNAL_DELEGATED_CONSTRUCTOR_CALL!>(23)<!> {
+    constructor(x: Byte) : <!EXTERNAL_DELEGATED_CONSTRUCTOR_CALL!>super<!>(23)
+
+    constructor(x: String) : <!EXTERNAL_DELEGATED_CONSTRUCTOR_CALL!>super<!>("")
+
+    constructor(x: String, y: String) : <!EXTERNAL_DELEGATED_CONSTRUCTOR_CALL!>super<!>("")
+}
+
+external open class Derived2() : Base<!EXTERNAL_DELEGATED_CONSTRUCTOR_CALL!>("")<!>
+

compiler/testData/diagnostics/testsWithJsStdLib/native/delegatedConstructorCall.txt

@@ -0,0 +1,27 @@
+package
+
+public external open class Base {
+    public constructor Base(/*0*/ x: kotlin.Int)
+    public constructor Base(/*0*/ x: kotlin.String)
+    public constructor Base(/*0*/ x: kotlin.String, /*1*/ y: kotlin.String)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public external open class Derived1 : Base {
+    public constructor Derived1()
+    public constructor Derived1(/*0*/ x: kotlin.Byte)
+    public constructor Derived1(/*0*/ x: kotlin.String)
+    public constructor Derived1(/*0*/ x: kotlin.String, /*1*/ y: kotlin.String)
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public external open class Derived2 : Base {
+    public constructor Derived2()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJsStdLib/native/delegation.kt

@@ -0,0 +1,18 @@
+external interface I
+
+external object O : I
+
+
+class Delegate {
+    operator fun getValue(thisRef: Any?, property: Any): String = ""
+
+    operator fun setValue(thisRef: Any?, property: Any, value: String) {}
+}
+
+external class A : <!EXTERNAL_DELEGATION!>I by O<!> {
+    val prop <!EXTERNAL_DELEGATION!>by Delegate()<!>
+
+    var mutableProp <!EXTERNAL_DELEGATION!>by Delegate()<!>
+}
+
+external val topLevelProp <!EXTERNAL_DELEGATION!>by Delegate()<!>

compiler/testData/diagnostics/testsWithJsStdLib/native/delegation.txt

@@ -0,0 +1,34 @@
+package
+
+public external val topLevelProp: kotlin.String
+
+public external final class A : I {
+    public constructor A()
+    public final var mutableProp: kotlin.String
+    public final val prop: kotlin.String
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class Delegate {
+    public constructor Delegate()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final operator fun getValue(/*0*/ thisRef: kotlin.Any?, /*1*/ property: kotlin.Any): kotlin.String
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final operator fun setValue(/*0*/ thisRef: kotlin.Any?, /*1*/ property: kotlin.Any, /*2*/ value: kotlin.String): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public external interface I {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public external object O : I {
+    private constructor O()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

compiler/testData/diagnostics/testsWithJsStdLib/native/inheritance.kt

@@ -6,9 +6,9 @@ interface I
 
 external open class B
 
-external class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>C<!> : A()
+external class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>C<!> : A
 
-external class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>D<!> : B(), I
+external class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>D<!> : B, I
 
 @native class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>N<!> : A()
 

compiler/testData/diagnostics/testsWithJsStdLib/native/overrideOptionalParam.kt

@@ -6,7 +6,7 @@ class B : A() {
     <!OVERRIDING_EXTERNAL_FUN_WITH_OPTIONAL_PARAMS!>override fun f(x: Int)<!> {}
 }
 
-external class C : A() {
+external class C : A {
     override fun f(x: Int)
 }
 
@@ -31,7 +31,7 @@ class F : D(), I {
     <!OVERRIDING_EXTERNAL_FUN_WITH_OPTIONAL_PARAMS!>override fun f(x: Int)<!> {}
 }
 
-external class G : D(), I {
+external class G : D, I {
     override fun f(x: Int)
 }
 
@@ -45,6 +45,6 @@ open external class XE {
 
 class <!OVERRIDING_EXTERNAL_FUN_WITH_OPTIONAL_PARAMS_WITH_FAKE!>Y<!> : X(), I
 
-external class YE: XE(), I
+external class YE: XE, I
 
 class Z : X(), J