3. Konfigurasi di Xcode

Xcode → Project → Target → Build Settings
└── Cari: "Swift Language Version"
    ├── Pilih "Swift 5"   → tetap Swift 5
    └── Pilih "Swift 6"   → aktifkan Swift 6 mode

Build Settings
├── Swift Compiler - Language
│   ├── Swift Language Version    [Swift 5] ← ubah ini
│   └── ...
└── Swift Compiler - Upcoming Features
    ├── Strict Concurrency Checking  [Minimal/Targeted/Complete]
    └── ...

Build Settings → Swift Compiler - Upcoming Features
└── Strict Concurrency Checking
    ├── Minimal   → hanya warning minimal (hampir tidak ada)
    ├── Targeted  → warning pada kode yang jelas concurrent ← REKOMENDASI untuk migrasi
    └── Complete  → semua warning Swift 6 (tapi masih warning, bukan error)

// xcconfig file
SWIFT_STRICT_CONCURRENCY = targeted

OTHER_SWIFT_FLAGS = -enable-upcoming-feature StrictConcurrency
                    -enable-upcoming-feature TypedThrows
                    -enable-upcoming-feature ExistentialAny

// MyApp.xcconfig
OTHER_SWIFT_FLAGS = $(inherited) -enable-upcoming-feature StrictConcurrency

MyApp (Xcode Project)
├── MyApp Target          → SWIFT_VERSION = 5  (UI layer, belum disentuh)
├── MyAppCore Target      → SWIFT_VERSION = 6  (business logic, sudah dimigrasikan)
│   └── Dependencies: MyAppLegacy
├── MyAppLegacy Target    → SWIFT_VERSION = 5  (kode lama yang belum dimigrasikan)
└── MyAppTests Target     → SWIFT_VERSION = 6  (test baru pakai Swift Testing)