swift-concurrency-6-2

To migrate to Swift 6.2 concurrency, enable MainActor default inference to make your app single-threaded by default, then progressively annotate CPU-heavy hot paths with @concurrent to maintain global state safety via actor isolation.

MainActor default inference is a Swift 6.2 mode that isolates code to the main thread by default, reducing boilerplate annotations in app targets and preventing unintended background work and data races.

You should use @concurrent in Swift 6.2 when offloading CPU-heavy tasks from the default single-threaded execution context, ensuring explicit opt-in concurrency without causing data races.

Yes, Swift 6.2 isolated conformances enable MainActor-isolated types to safely implement protocols, maintaining actor isolation while satisfying protocol requirements without breaking global state safety.

The best way to adopt Swift 6.2 actor isolation for legacy code is to enable features progressively during platform adoption, starting with MainActor default inference before applying explicit concurrency annotations.

Unintended background work in Swift projects stems from implicit offloading in earlier concurrency models; adopting Swift 6.2 approachable concurrency makes code single-threaded by default to eliminate these subtle bugs.