[Announcement] Deprecation of PromiseKit in Swift 6 Generator

[4brunu]

With the transition to Swift 6 and the maturity of native async/await, we suspect that PromiseKit usage within the generator has significantly declined.

To gauge community reliance on this integration and streamline the codebase, we are taking the following steps:

The Plan

• Deprecation: PromiseKit will be formally marked as deprecated in the next release. The deprecation warning will include a link leading back to this issue for context.

• Feedback Period: We are looking for community input. If your project still relies on PromiseKit integration within the Swift 6 generator, please leave a comment below explaining your use case.

• Timeline: If there is no significant feedback or objection by the end of 2026, we plan to permanently remove PromiseKit support in early 2027.

Why this change?

As Swift 6 emphasizes structured concurrency, maintaining legacy promise libraries increases maintenance overhead. We want to ensure the generator remains modern and efficient while still providing a window for users to transition their projects.

We value your feedback—please let us know if this change impacts your workflow!