JS Union type members should have inherit corresponding marker interface

libraries/tools/idl2k/src/main/kotlin/gen.kt

@@ -170,7 +170,7 @@ fun generateUnions(ifaces: List<GenerateTraitOrClass>, typedefs: Iterable<Typede
             .filter { it.value.memberTypes.all { type -> type in declaredTypes } }
     val typedefsMarkersMap = typedefsToBeGenerated.groupBy { it.name }.mapValues { mapUnionType(it.value.first().value).copy(name = it.key) }
 
-    val typeNamesToUnions = anonymousUnionTypes.flatMap { unionType -> unionType.memberTypes.map { unionMember -> unionMember to unionType.name } }.toMultiMap() +
+    val typeNamesToUnions = anonymousUnionTypes.flatMap { unionType -> unionType.memberTypes.map { unionMember -> unionMember to unionType.name } }.toMultiMap() merge
             typedefsToBeGenerated.flatMap { typedef -> typedef.value.memberTypes.map { unionMember -> unionMember to typedef.name } }.toMultiMap()
 
     return GenerateUnionTypes(

libraries/tools/idl2k/src/main/kotlin/main.kt

@@ -13,8 +13,6 @@ fun main(args: Array<String>) {
         System.exit(1)
         return
     }
-    outDir.deleteRecursively()
-    outDir.mkdirs()
 
     val repository = srcDir.walkTopDown().filter { it.isDirectory() || it.extension == "idl" }.asSequence().filter { it.isFile() }.fold(Repository(emptyMap(), emptyMap(), emptyMap(), emptyMap())) { acc, e ->
         val fileRepository = parseIDL(ANTLRFileStream(e.getAbsolutePath(), "UTF-8"))
@@ -31,6 +29,9 @@ fun main(args: Array<String>) {
     val unions = generateUnions(definitions, repository.typeDefs.values())
     val allPackages = definitions.map { it.namespace }.distinct().sort()
 
+    outDir.deleteRecursively()
+    outDir.mkdirs()
+
     allPackages.forEach { pkg ->
         File(outDir, pkg + ".kt").bufferedWriter().use { w ->
             w.appendln("/*")

libraries/tools/idl2k/src/main/kotlin/typeMappings.kt

@@ -102,6 +102,7 @@ private fun mapType(repository: Repository, type: String): String =
         type.startsWith("unrestricted") -> mapType(repository, type.substring(12))
         type.startsWith("sequence<") -> "Array<${mapType(repository, type.removePrefix("sequence<").removeSuffix(">").trim())}>"
         type.startsWith("sequence") -> "Array<dynamic>"
+        type.startsWith("Union<") -> "Union<" + splitUnionType(type).map { mapType(repository, it) }.join(",") + ">"
         type in repository.typeDefs -> mapTypedef(repository, type)
         type in repository.enums -> "String"
         type.contains("->") -> {