I have the following,

(reagent/create-class
     {:should-component-update
      (fn [this old new]
        (println "should-component-update" old new)
        false)
      :reagent-render
      (fn [_]
        (println "reagent-render")
        [component])})

My understanding is that should-component-update should fire before reagent-render is called.

Hmm, something must be wrong with my metaphor, the subscription I create in a outer let binding is derefed (not shown here) in component... How could :should-component-update's function be aware of a derefed subscrition value in :reagent-render's function?

apologies, now I am mixing my re-frame and my reagent problems. 🙂

I believe reagent calls forceUpdate when it reacts to a ratom change, which would route around :should-component-update

are hooks integrated with reagent fully?

no, you cannot use hooks in reagent components right now

there are several other libraries that have integrated with hooks, if you’re interested in trying them out