swift-concurrency-6-2
Swift 6.2 Approachable Concurrency — single-threaded by default, @concurrent for explicit background offloading, isolated conformances for main actor types. Use when adopting Swift 6.2 concurrency — offloading with @concurrent or resolving main-actor isolation.
- Kind
- Skill
- Works with
- Claude Code, Codex
- Languages
- Swift
- Source
- affaan-m/ECC @ d3b8a3e90890
- Path
- skills/swift-concurrency-6-2/SKILL.md
- License
- MIT
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# Swift 6.2 Approachable Concurrency
Patterns for adopting Swift 6.2's concurrency model where code runs single-threaded by default and concurrency is introduced explicitly. Eliminates common data-race errors without sacrificing performance.
## When to Activate
- Migrating Swift 5.x or 6.0/6.1 projects to Swift 6.2
- Resolving data-race safety compiler errors
- Designing MainActor-based app architecture
- Offloading CPU-intensive work to background threads
- Implementing protocol conformances on MainActor-isolated types
- Enabling Approachable Concurrency build settings in Xcode 26
## Core Problem: Implicit Background Offloading
In Swift 6.1 and earlier, async functions could be implicitly offloaded to background threads, causing data-race errors even in seemingly safe code:
```swift
// Swift 6.1: ERROR
@MainActor
final class StickerModel {
let photoProcessor = PhotoProcessor()
func extractSticker(_ item: PhotosPickerItem) async throws -> Sticker? {
guard let data = try await item.loadTransferable(type: Data.self) else { return nil }
// Error: Sending 'self.photoProcessor' risks causing data races
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