React Portals with Helix

I’m just about to attempt to figure out how to use React Portals (Cf createPortal) in a Helix project. I haven’t found any mention of it in the Helix repo. If anybody has any pointers (say, to documentation), it would be appreciated.

UPDATE: It turns out to be straightforward. createPortal (required from "react-dom") is simply used as a child in the declaration of a Helix component, eg:

(defnc my-component []
    (d/p "The following text will be mounted in the body element:")
    (createPortal (d/p "This text is a child of the body element.")
                  (.. js/document -body))))