# when(platforms:traits:) Creates a target dependency condition. ``` static func when(platforms: [Platform], traits: Set) -> TargetDependencyCondition? ``` ## Parameters `platforms` The applicable platforms for this target dependency condition. `traits` The applicable traits for this target dependency condition. --- 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)