I +1 MobX wherever I see it mentioned, but I have to disagree here:

> having logic and state in the view layer leads to spaghetti code

Sometimes it makes sense to put logic and state in your view components, and the wonderful thing about MobX is that it doesn't care. It lets you freely move your state around to wherever you want it to live: inside components, outside components, in a module-scoped object, in a global store, all of the above. It's just JavaScript objects.

For those fighting with hooks: one of the best things about MobX is that it does all dependency-tracking (for effects, but also for components) automatically and flawlessly. An entire problem-space that's usually easy to mess up just vanishes in front of your eyes. Going back to anything else feels like going back to the dark ages.