Nukes in Star Wars?

Considering the tech level we’re dealing with in SW, it seems like a lot of worlds — especially in the Core — would’ve had the ability to enrich uranium (or an in-universe equivalent). But I can’t recall nuclear weapons ever being mentioned in Star Wars, even in the weirdest Legends books. Was there a strict no-nukes policy in place at the production/publishing level, or some other reason why they didn’t exist in the galaxy far, far away?