[K/JS] Prepare JS Plain Objects plugin to publication

plugins/js-plain-objects/runtime/build.gradle.kts

@@ -0,0 +1,42 @@
+import plugins.configureDefaultPublishing
+import plugins.configureKotlinPomAttributes
+
+description = "Runtime library for the JS Plain Objects compiler plugin"
+
+plugins {
+    kotlin("js")
+    `maven-publish`
+}
+
+group = "org.jetbrains.kotlin"
+
+kotlin {
+    js {
+        browser()
+        nodejs()
+        compilations["main"].defaultSourceSet {
+            dependencies {
+                compileOnly(kotlin("stdlib-js"))
+            }
+        }
+    }
+}
+
+val emptyJavadocJar by tasks.registering(Jar::class) {
+    archiveClassifier.set("javadoc")
+}
+
+configureDefaultPublishing()
+
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            artifactId = "kotlin-js-plain-objects"
+            from(components["kotlin"])
+            configureKotlinPomAttributes(project, "Annotations library for the JS Plain Objects compiler plugin", packaging = "klib")
+        }
+        withType<MavenPublication> {
+            artifact(emptyJavadocJar)
+        }
+    }
+}

plugins/js-plain-objects/runtime/src/main/kotlin/JsPlainObject.kt

@@ -0,0 +1,11 @@
+/*
+ * 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 kotlinx.js
+
+
+@Target(AnnotationTarget.CLASS)
+@Retention(AnnotationRetention.BINARY)
+public annotation class JsPlainObject