Support for Es6 was introduced to Kony Visualizer Android and iOS apps starting with version 7.3. This is a Kony app that tests support for a few of those Es6 features.
When running the app directly into an iOS emulator from Visualizer the javascript files are not properly loaded and functions runTests and runTemplateLiteralTests are left undefined. However if the app is run from Xcode the javascript modules are loaded without an issue.