[K/JS] Support companion objects in external and exported declarations

js/js.translator/testData/box/esModules/jsExport/interfaceWithCompanion.kt

@@ -0,0 +1,24 @@
+// SKIP_MINIFICATION
+// ES_MODULES
+
+// FILE: api.kt
+package api
+
+@JsExport
+interface A {
+    companion object {
+        fun ok() = "OK"
+    }
+}
+
+// FILE: main.kt
+external interface JsResult {
+    val res: String
+}
+
+@JsModule("./interfaceWithCompanion.mjs")
+external fun jsBox(): JsResult
+
+fun box(): String {
+    return jsBox().res
+}

js/js.translator/testData/box/esModules/jsExport/interfaceWithCompanion.mjs

@@ -0,0 +1,7 @@
+import * as api from "./interfaceWithCompanion_v5.mjs";
+
+export default function() {
+    return {
+        "res": api.A.getInstance().ok()
+    };
+};