Is there a significant difference between React-Native useEffect [] and a custom function inside iOS didFinishLaunchingWithOptions?

I am building a React-Native SDK library based on Swift/Kotlin modules, and I want to deliver the best UX to those, who will use it.

I could not notice how AppDelegate didFinishLaunchingWithOptions is similar to React useEffect, so I've really started to wonder whether we can replicate such behavior inside the JS code.

I did some tests, comparing useEffect inside a core component with a function inside didFinishLaunchingWithOptions, so the only difference I found is:

• useEffect certainly executes only after the application started, while the iOS function would be executed during startup

I presumed, that useEffect would execute a closure every time the app is opened, but in a core component, it seems to behave the right way.

So how different is creating an SDK initialization inside, for example, useEffect and calling it from where they always put it: didFinishLaunchingWithOptions inside AppDelegate