how can I migrate to swift 6 easily

Generated on 9/26/2024

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To migrate to Swift 6 easily, you can follow a structured approach as outlined in the WWDC session "Migrate your app to Swift 6". Here are some key steps to consider:

  1. Enable Complete Concurrency Checking: Start by enabling complete concurrency checking for each module in your project. This will keep your project in Swift 5 mode but will provide warnings for code that would fail under Swift 6's enforced data isolation. This step helps you identify and resolve potential issues before fully migrating.

  2. Resolve Warnings: Go through the warnings generated by the concurrency checking and resolve them. This process will guide you in making your code safe for Swift 6's data isolation features.

  3. Enable Swift 6 Mode: Once you have resolved the warnings for a module, enable Swift 6 mode for that module. This locks in your changes and prevents future regressions to unsafe states.

  4. Incremental Migration: Migrate your project incrementally, one module at a time. This allows you to manage the migration process more effectively and ensures that you can interoperate with dependencies that may not yet be migrated to Swift 6.

  5. Refactor as Needed: After enabling Swift 6 mode, consider refactoring your code to take full advantage of Swift 6's features and to remove any unsafe opt-outs you may have used during the migration.

For a detailed walkthrough, you can refer to the session Migrate your app to Swift 6 (07:26) which provides a step-by-step guide on the migration process.

Additionally, the session "What’s new in Swift" discusses the new Swift 6 language mode and its benefits, such as data race safety, which can be a valuable resource for understanding the improvements and how they can be applied to your codebase.