[FIR JS] Support NON_EXTERNAL_DECLARATION_IN_INAPPROPRIATE_FILE

compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/diagnostics/FirJsDiagnosticsList.kt

@@ -76,6 +76,9 @@ object JS_DIAGNOSTICS_LIST : DiagnosticList("FirJsErrors") {
         val INLINE_CLASS_IN_EXTERNAL_DECLARATION by error<KtElement>(PositioningStrategy.DECLARATION_SIGNATURE_OR_DEFAULT)
         val EXTENSION_FUNCTION_IN_EXTERNAL_DECLARATION by error<KtElement>(PositioningStrategy.DECLARATION_SIGNATURE_OR_DEFAULT)
         val NON_ABSTRACT_MEMBER_OF_EXTERNAL_INTERFACE by error<KtExpression>(PositioningStrategy.DECLARATION_SIGNATURE_OR_DEFAULT)
+        val NON_EXTERNAL_DECLARATION_IN_INAPPROPRIATE_FILE by error<KtElement>(PositioningStrategy.DECLARATION_SIGNATURE_OR_DEFAULT) {
+            parameter<ConeKotlinType>("type")
+        }
     }
 
     val DYNAMICS by object : DiagnosticGroup("Dynamics") {

compiler/fir/checkers/checkers.js/gen/org/jetbrains/kotlin/fir/analysis/diagnostics/js/FirJsErrors.kt

@@ -67,6 +67,7 @@ object FirJsErrors {
     val INLINE_CLASS_IN_EXTERNAL_DECLARATION by error0<KtElement>(SourceElementPositioningStrategies.DECLARATION_SIGNATURE_OR_DEFAULT)
     val EXTENSION_FUNCTION_IN_EXTERNAL_DECLARATION by error0<KtElement>(SourceElementPositioningStrategies.DECLARATION_SIGNATURE_OR_DEFAULT)
     val NON_ABSTRACT_MEMBER_OF_EXTERNAL_INTERFACE by error0<KtExpression>(SourceElementPositioningStrategies.DECLARATION_SIGNATURE_OR_DEFAULT)
+    val NON_EXTERNAL_DECLARATION_IN_INAPPROPRIATE_FILE by error1<KtElement, ConeKotlinType>(SourceElementPositioningStrategies.DECLARATION_SIGNATURE_OR_DEFAULT)
 
     // Dynamics
     val DELEGATION_BY_DYNAMIC by error0<KtElement>()

compiler/fir/checkers/checkers.js/src/org/jetbrains/kotlin/fir/analysis/diagnostics/js/FirJsErrorsDefaultMessages.kt

@@ -36,6 +36,7 @@ import org.jetbrains.kotlin.fir.analysis.diagnostics.js.FirJsErrors.NATIVE_SETTE
 import org.jetbrains.kotlin.fir.analysis.diagnostics.js.FirJsErrors.NESTED_CLASS_IN_EXTERNAL_INTERFACE
 import org.jetbrains.kotlin.fir.analysis.diagnostics.js.FirJsErrors.NESTED_EXTERNAL_DECLARATION
 import org.jetbrains.kotlin.fir.analysis.diagnostics.js.FirJsErrors.NON_ABSTRACT_MEMBER_OF_EXTERNAL_INTERFACE
+import org.jetbrains.kotlin.fir.analysis.diagnostics.js.FirJsErrors.NON_EXTERNAL_DECLARATION_IN_INAPPROPRIATE_FILE
 import org.jetbrains.kotlin.fir.analysis.diagnostics.js.FirJsErrors.OVERRIDING_EXTERNAL_FUN_WITH_OPTIONAL_PARAMS
 import org.jetbrains.kotlin.fir.analysis.diagnostics.js.FirJsErrors.OVERRIDING_EXTERNAL_FUN_WITH_OPTIONAL_PARAMS_WITH_FAKE
 import org.jetbrains.kotlin.fir.analysis.diagnostics.js.FirJsErrors.RUNTIME_ANNOTATION_NOT_SUPPORTED
@@ -129,6 +130,11 @@ object FirJsErrorsDefaultMessages : BaseDiagnosticRendererFactory() {
             KtDiagnosticRenderers.TO_STRING,
             CommonRenderers.STRING
         )
+        map.put(
+            NON_EXTERNAL_DECLARATION_IN_INAPPROPRIATE_FILE,
+            "Can''t put non-external declarations in file marked with {0} annotation",
+            FirDiagnosticRenderers.RENDER_TYPE
+        )
 
         map.checkMissingMessages(FirJsErrors)
     }

compiler/fir/checkers/checkers.js/src/org/jetbrains/kotlin/fir/analysis/js/checkers/JsDeclarationCheckers.kt

@@ -25,6 +25,7 @@ object JsDeclarationCheckers : DeclarationCheckers() {
             FirJsModuleChecker,
             FirJsRuntimeAnnotationChecker,
             FirJsExternalChecker,
+            FirJsExternalFileChecker,
         )
 
     override val classCheckers: Set<FirClassChecker>

compiler/fir/checkers/checkers.js/src/org/jetbrains/kotlin/fir/analysis/js/checkers/declaration/FirJsExternalFileChecker.kt

@@ -0,0 +1,45 @@
+/*
+ * 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.fir.analysis.js.checkers.declaration
+
+import org.jetbrains.kotlin.diagnostics.DiagnosticReporter
+import org.jetbrains.kotlin.diagnostics.reportOn
+import org.jetbrains.kotlin.fir.analysis.checkers.closestNonLocalWith
+import org.jetbrains.kotlin.fir.analysis.checkers.context.CheckerContext
+import org.jetbrains.kotlin.fir.analysis.checkers.declaration.FirBasicDeclarationChecker
+import org.jetbrains.kotlin.fir.analysis.js.checkers.isNativeObject
+import org.jetbrains.kotlin.fir.analysis.checkers.isTopLevel
+import org.jetbrains.kotlin.fir.analysis.diagnostics.js.FirJsErrors
+import org.jetbrains.kotlin.fir.declarations.FirDeclaration
+import org.jetbrains.kotlin.fir.declarations.FirFile
+import org.jetbrains.kotlin.fir.declarations.fullyExpandedClassId
+import org.jetbrains.kotlin.fir.types.coneType
+import org.jetbrains.kotlin.name.JsStandardClassIds
+import org.jetbrains.kotlin.utils.addToStdlib.lastIsInstanceOrNull
+
+object FirJsExternalFileChecker : FirBasicDeclarationChecker() {
+    override fun check(declaration: FirDeclaration, context: CheckerContext, reporter: DiagnosticReporter) {
+        val closestNonLocal = context.closestNonLocalWith(declaration)?.symbol ?: return
+
+        if (closestNonLocal.isNativeObject(context) || !context.isTopLevel) {
+            return
+        }
+
+        val targetAnnotations = context.containingDeclarations
+            .lastIsInstanceOrNull<FirFile>()
+            ?.annotations
+            ?.firstOrNull { it.fullyExpandedClassId(context.session) in JsStandardClassIds.Annotations.annotationsRequiringExternal }
+
+        if (targetAnnotations != null) {
+            reporter.reportOn(
+                declaration.source,
+                FirJsErrors.NON_EXTERNAL_DECLARATION_IN_INAPPROPRIATE_FILE,
+                targetAnnotations.typeRef.coneType,
+                context
+            )
+        }
+    }
+}

compiler/testData/diagnostics/testsWithJsStdLib/module/jsModuleNonExternal.fir.kt

@@ -1,9 +0,0 @@
-@file:JsModule("lib")
-
-class A {
-    class B
-
-    fun bar() {}
-}
-
-fun foo() = "OK"

compiler/testData/diagnostics/testsWithJsStdLib/module/jsModuleNonExternal.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 @file:JsModule("lib")
 
 class <!NON_EXTERNAL_DECLARATION_IN_INAPPROPRIATE_FILE!>A<!> {

compiler/testData/diagnostics/testsWithJsStdLib/qualifier/jsQualifierNonExternal.fir.kt

@@ -1,9 +0,0 @@
-@file:JsQualifier("a.b")
-
-class A {
-    class B
-
-    fun bar() {}
-}
-
-fun foo() = "OK"

compiler/testData/diagnostics/testsWithJsStdLib/qualifier/jsQualifierNonExternal.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 @file:JsQualifier("a.b")
 
 class <!NON_EXTERNAL_DECLARATION_IN_INAPPROPRIATE_FILE!>A<!> {