Slightly better type-safe notifications for Apple platforms

BetterNotification.swift

import Combine
import Foundation

public protocol BetterNotification {}

private extension BetterNotification {
    static var notificationName: Notification.Name {
        Notification.Name(rawValue: "BetterNotification:\(Self.self)")
    }
}

public extension Notification {
    static func better<T: BetterNotification> (
        _ betterNotification: T,
        object: Any? = nil
    ) -> Notification {
        Notification(name: T.notificationName, object: object, userInfo: [
            "betterNotification": betterNotification,
        ])
    }
}

public extension NotificationCenter {
    func publisher<T: BetterNotification>(
        for betterType: T.Type
    ) -> AnyPublisher<T, Never> {
        publisher(for: betterType.notificationName )
            .compactMap { $0.userInfo?["betterNotification"] as? T }
            .eraseToAnyPublisher()
    }
}