swift-concurrency-expert

原文涵盖的主题

• Swift Concurrency Expert
• Overview
• When to Use
• Workflow
• 1. Triage the issue
• 2. Apply the smallest safe fix
• 3. Verify the fix
• Examples

Review and fix Swift Concurrency issues in Swift 6.2+ codebases by applying actor isolation, Sendable safety, and modern concurrency patterns with minimal behavior changes. When the user asks to review Swift concurrency usage or fix compiler diagnostics. When you need guidance on actor isolation, Sendable, @MainActor, or async migration. Capture the exact compiler diagnostics and the offending symbol(s). Check project concurrency settings: Swift language version (6.2+), strict concurrency level, and whether approachable concurrency (default actor isolation / main-actor-by-default) is enabled. Identify the current actor context (@MainActor, actor, nonisolated) and whether a default actor isolation mode is enabled. Confirm whether the code is UI-bound or intended to run off the main actor. Prefer edits that preserve existing behavior while satisfying data-race safety. Common fixes: UI-bound types: annotate the type or relevant members with @MainActor. Protocol conformance on main actor types: make the conformance isolated (e.g., extension Foo: @MainActor SomeProtocol). Global/static state: protect with @MainActor or move into an actor. Background work: move expensive work into a @con

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