# AnyPublisher A publisher that performs type erasure by wrapping another publisher. ``` @frozen struct AnyPublisher where Failure : Error ``` ## Overview [`AnyPublisher`](/documentation/Combine/AnyPublisher) is a concrete implementation of [`Publisher`](/documentation/Combine/Publisher) that has no significant properties of its own, and passes through elements and completion values from its upstream publisher. Use [`AnyPublisher`](/documentation/Combine/AnyPublisher) to wrap a publisher whose type has details you don’t want to expose across API boundaries, such as different modules. Wrapping a [`Subject`](/documentation/Combine/Subject) with [`AnyPublisher`](/documentation/Combine/AnyPublisher) also prevents callers from accessing its [`send(_:)`](/documentation/Combine/Subject/send(_:)) method. When you use type erasure this way, you can change the underlying publisher implementation over time without affecting existing clients. You can use Combine’s [`eraseToAnyPublisher()`](/documentation/Combine/Publisher/eraseToAnyPublisher()) operator to wrap a publisher with [`AnyPublisher`](/documentation/Combine/AnyPublisher). ## Topics ### Creating a type-erased publisher [`init(_:)`](/documentation/Combine/AnyPublisher/init(_:)) Creates a type-erasing publisher to wrap the provided publisher. ## Relationships ### Conforms To [`Publisher`](/documentation/Combine/Publisher) [`CustomPlaygroundDisplayConvertible`](/documentation/Swift/CustomPlaygroundDisplayConvertible) [`Escapable`](/documentation/Swift/Escapable) [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) [`Copyable`](/documentation/Swift/Copyable) --- 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)