Add Support for Swift 6

[woutergoossens]

Context 🕵️‍♀️

Our Design System (fully built in SwiftUI) is a separate Swift Package and is optimized for Swift 6.
We use the PrefireTestsPlugin for preview tests.

What 🌱

When I update our swift-tools-version to 6.0 I receive the following errors:

Proposal 🎉

Is it possible to update Prefire to Swift 6 and make it compatible with Swift Concurrency?

[woutergoossens]

Hi @BarredEwe Thanks for the update. But I still get the same issues with I run the preview tests? In the PreviewTests file.. Should I update the stencil file?

[woutergoossens]

And we get that issue because we have components that are marked with @mainactor

[BarredEwe]

@woutergoossens Can you attach an example View with this error?

[woutergoossens]

Yes, created an example.
You need to enable PrefireExample app to use Swift Language version 6.

If you add this ButtonTestView, it will fail
ButtonTestView.swift.zip

To make the code compile, we can add @mainactor above the static func Contained. But then the preview tests will fail.

[BarredEwe]

Thank you very much for your contribution to the project! The example helped to fix these errors. Added the fix to the latest release

[woutergoossens]

Hi! Updated to the latest release but now I get the following errors with Xcode 16.2 ->

I don't use the PlayBookView, only the PrefireTestsPlugin..

[BarredEwe]

Hi! This problem is reproduced only in Xcode 16.2. I had to update and immediately got it fixed!
Done in the latest release.

[woutergoossens]

Indeed, was only with the Xcode 16.2.. Thanks for the fast update!
Updated and works. Thanks!!

[woutergoossens]

Only some warnings now regarding deprecation.

[woutergoossens]

In the PreviewTests also a warning when Swift 6 is enabled..