EventConvertible sketch.

event_convertible.swift

protocol EventConvertible {
	associatedtype Output
	associatedtype Failure: Error

	var event: Event<Output, Failure> { get }
}

extension Event: EventConvertible {
	var event: Event<Output, Failure> { self }
}

extension Publisher where Output: EventConvertible {
	func values() -> AnyPublisher<Output.Output, Never> { /// (1) With type-erased placeholders, for now.
		fatalError("To be implemented.")
	}

	func errors() -> AnyPublisher<Output.Failure, Never> { /// (2) Same here.
		fatalError("To be implemented.")
	}
}