# add(key:dependency:) ``` final func add(key: AnyHashable? = nil, dependency dependencyProvider: @autoclosure @escaping () -> @Sendable () throws -> Dependency) where Dependency : Sendable ``` --- 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)