Add explicit imports of kotlin.js.* to generated files.

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

@@ -61,6 +61,7 @@ fun main(args: Array<String>) {
             w.appendln("package $pkg")
             w.appendln()
 
+            w.appendln("import kotlin.js.*")
             allPackages.filter { it != pkg }.forEach { import ->
                 w.appendln("import $import.*")
             }

libraries/tools/kotlin-stdlib-gen/src/generators/GenerateStandardLib.kt

@@ -99,6 +99,9 @@ private fun List<ConcreteFunction>.writeTo(file: File, sourceFile: SourceFile, p
 
         writer.append("package ${sourceFile.packageName ?: "kotlin"}\n\n")
         writer.append("$COMMON_AUTOGENERATED_WARNING\n\n")
+        if (platform == Platform.JS) {
+            writer.appendln("import kotlin.js.*")
+        }
         writer.append("import kotlin.comparisons.*\n\n")
 
         for (f in this) {