How to serialise a unique identifier for a JavaScript method?

I need to serialize a JavaScript method and its contents to send to a web client, and if the text is modified in the web client, I would like to apply those changes to IntelliJ in real-time. Therefore I need a way to locate the 'method which is being edited in the web client', in IntelliJ.

I get the method (a `JSPropertyImpl` in my case - I'm using CoffeeScript), from a `FileEditorManager.selectionChanged` event like so:

```
val offset = editor.getCaretModel.getOffset()
val el = psiFile.getViewProvider.findElementAt(offset)
val method = PsiTreeUtil.getParentOfType(el, classOf[JSPropertyImpl])
```

My question is what is the best way to locate this `JSPropertyImpl` again?

My first idea is to send `psiFile.getVirtualFile.getCanonicalPath` and `method.getTextOffset` to the web client along with `method.getText`.

I could then look for open editors matching the canonical path and then use `psiFile.findElementAt(<text offset from client>)`.

I would prefer to be able to uniquely identify the JSPropertyImpl than relying on text offset of the element in a file. Is this possible?

Thanks!