[JS FE] Prohibit external inline classes

#KT-26138 Fixed

js/js.frontend/src/org/jetbrains/kotlin/js/resolve/diagnostics/JsExternalChecker.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2018 JetBrains s.r.o. 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.resolve.diagnostics
@@ -28,8 +17,8 @@ import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
-import org.jetbrains.kotlin.resolve.checkers.DeclarationCheckerContext
 import org.jetbrains.kotlin.resolve.checkers.DeclarationChecker
+import org.jetbrains.kotlin.resolve.checkers.DeclarationCheckerContext
 import org.jetbrains.kotlin.resolve.descriptorUtil.*
 import org.jetbrains.kotlin.resolve.source.getPsi
 import org.jetbrains.kotlin.types.TypeUtils
@@ -59,6 +48,9 @@ object JsExternalChecker : DeclarationChecker {
         else if (descriptor is ClassDescriptor && descriptor.isInner) {
             trace.report(ErrorsJs.WRONG_EXTERNAL_DECLARATION.on(declaration, "inner class"))
         }
+        else if (descriptor is ClassDescriptor && descriptor.isInline) {
+            trace.report(ErrorsJs.WRONG_EXTERNAL_DECLARATION.on(declaration, "inline class"))
+        }
         else if (isPrivateMemberOfExternalClass(descriptor)) {
             trace.report(ErrorsJs.WRONG_EXTERNAL_DECLARATION.on(declaration, "private member of class"))
         }