Is there a recommended way of programmatically adding a component to an Integrant config? I have two components, handler and processor, which both depend on a common component, state. This state is simply an atom of an empty map, nothing fancy. I was able to get this to work with an edn file that in part looks like this:

{:state {}
 :handler   {:state #ig/ref :state}
 :processor {:state #ig/ref :state}}

at some point you’re gonna need to write the equivalent of (assoc ig-state :state {}), right? Either it’s in the config file as you have it, or it’s in a line of code you write in a preprocessor. At least when it’s in the config file it’s explicit and lets you see the path of dependencies, unlike something that hides how it actually works (which would happen if you, say, changed the resolution system to create nil fields when referencing an non-existent field).

Right. I had just hoped that ig/init-key could look for the multimethod without needing to find a match in the edn file, but I suppose it's just not there. And you're right - better to show the dependency at the cost of a tiny bit of extra config. Thanks!

something i’ve come to do is leave all of those as nil so it’s very obvious that they aren’t passing anything interesting in

I like that idea. It looks very clear.