# init(_:) Creates a type-erasing subscriber to wrap an existing subscriber. ``` init(_ s: S) where Input == S.Output, Failure == S.Failure, S : Subject ``` ## Parameters `s` The subscriber to type-erase. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)