[FIR JS] Report WRONG_JS_QUALIFIER for the argument of JsQualifier

core/compiler.common.js/build.gradle.kts

@@ -0,0 +1,15 @@
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
+
+project.configureJvmToolchain(JdkMajorVersion.JDK_1_8)
+
+dependencies {
+    api(project(":core:compiler.common"))
+}
+
+sourceSets {
+    "main" { projectDefault() }
+    "test" {}
+}

core/compiler.common.js/src/org/jetbrains/kotlin/js/JsHelpers.kt

@@ -0,0 +1,15 @@
+/*
+ * 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
+
+fun validateQualifier(qualifier: String): Boolean {
+    val parts = qualifier.split('.')
+    if (parts.isEmpty()) return false
+
+    return parts.all { part ->
+        part.isNotEmpty() && part[0].isJavaIdentifierStart() && part.drop(1).all(Char::isJavaIdentifierPart)
+    }
+}

core/compiler.common.js/src/org/jetbrains/kotlin/name/JsStandardClassIds.kt

@@ -0,0 +1,18 @@
+/*
+ * 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.name
+
+import org.jetbrains.kotlin.name.StandardClassIds.BASE_KOTLIN_PACKAGE
+
+object JsStandardClassIds {
+    val BASE_JS_PACKAGE = BASE_KOTLIN_PACKAGE.child(Name.identifier("js"))
+
+    object Annotations {
+        val JsQualifier = "JsQualifier".jsId()
+    }
+}
+
+private fun String.jsId() = ClassId(JsStandardClassIds.BASE_JS_PACKAGE, Name.identifier(this))