notification.swift

import Foundation

extension NotificationCenter {
	public func addOIsolatedObserver<Payload>(
		forName name: Notification.Name,
		object obj: Any? = nil,
		isolation: (any Actor)? = #isolation,
		process: @Sendable @escaping (Notification) -> Payload,
		using block: @Sendable @escaping (Payload) -> Void
	) -> any NSObjectProtocol where Payload : Sendable {
		return self.addObserver(forName: name, object: obj, queue: .main) { note in
			let payload = process(note)

			isolation?.assumeIsolated { _ in
				block(payload)
			}
		}
	}
}

Optional is clearly a bug…

I wrote this when I was tried and it is very wrong.