ah I found https://day8.github.io/re-frame/External-Resources/

There's a third way, where you cache the value manually under some key in app-db. Global interceptors can help with that.

Note that the subscription injector you’ve linked will also cache miss if you decide to use it. IIRC there is a chance of caching when a component is already deferring the sub

There are two approaches I usually see: • if no components use the sub, bite the bullet and compute the sub — the db is always with you in an event handler • if a component uses the sub, find a way to pass the value into the event vector

Cache miss only if there are no components subscribing to it, right?

Yes.

I am using this, and I am getting "Subscribe was called outside of a reactive context." warnings on js console. How do I remove this? (I have a vague sense I want to use meta for this, but not sure which)

Also, can you elaborate on using global interceptors for caching values? Would it be something like if values A or B changed, recompute C (which depends on A and B)?

Dunno about the warning, haven't looked into it. I know the reason for it but now how to suppress it. But people have asked this before, specifically in this context - maybe there's something in the issue tracker of that project or maybe you can find something in here. Regarding global interceptors - yes, exactly.

Interceptors definitely make the implementation a lot simpler. Thanks