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swift-concurrency

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Resolve Swift concurrency compiler errors, adopt 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.

When to use

• Fixing Sendable conformance errors
• Resolving actor isolation warnings
• Addressing strict concurrency diagnostics
• Adopting default MainActor isolation
• Using @concurrent and nonisolated(nonsending)
• Designing actor-based architectures
• Implementing structured concurrency with TaskGroup
• Migrating from @preconcurrency to Swift 6 strict concurrency

When not to use

• Adding Thread Sanitizer
• Broad migration ordering
• Architecture advice unless requested

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