Currently, there’s nothing like this in JS… only for Jython. Once OH is compatible with JDK9, which has ES6, I plan to build the same functionality into the JS helper libraries. This could probably be done now, but will be easier with class support. But I’ll also be working on a new scripting API that will replace the need for using the helper libraries too. Not sure which will come first. The raw API is ugly!
If you’re not set on JS, try Jython! 