swift-concurrency

Review, fix, and write concurrent Swift code targeting Swift 6.2+. Apply actor isolation, Sendable safety, and modern concurrency patterns with minimal behavior changes.

Prefer edits that preserve existing behavior while satisfying data-race safety.

| UI-bound type | Annotate the type or relevant members with @MainActor. | | Protocol conformance on MainActor type | Use an isolated conformance: extension Foo: @MainActor Proto. | | Global / static state | Protect with @MainActor or move into an actor. | | Background work needed | Use a @concurrent async function on a nonisolated type. |

Resolve Swift concurrency compiler errors, adopt Swift 6.2 approachable concurrency (SE-0466), and write data-race-safe async code. Use when fixing Sendable conformance errors, actor isolation warnings, or strict concurrency diagnostics; when adopting default MainActor isolation, @concurrent, nonisolated(nonsending), or Task.immediate; when designing actor-based architectures, structured concurrency with TaskGroup, or background work offloading; or when migrating from @preconcurrency to full Swift 6 strict concurrency. Source: dpearson2699/swift-ios-skills.