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The trick is to use the same JS script as you’re running in, and catch the exception when you access `window`. That will throw a `ReferenceError`, but since that isn’t exposed to the Kotlin/JS API, you have to catch `Throwable` instead. Now you know if you’re running in the window or as a service worker

I'm not aware of any progress towards Service Workers. But we've got a person working on integration with Web Workers as a 20% project. I can put you in touch with him if you wish.

My colleague suggested that what you actually want is to put the worker code into a separate `.js`  file.

The only way to do that at the moment is to move the worker code to a separate module.

Yeah, that was my next step. Do I just add a project dependency to my main module then and the runBrowser task will give me two files?

Something like that, yes. My understanding is that you want to end up with 2 self-sufficient bundles. Then you pass the second one as the worker.