When should I migrate to Swift 6?

Generated on 7/31/2024

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You should consider migrating to Swift 6 when you are ready to tackle data races in your code. The new Swift 6 language mode introduces compile-time data race safety, which may involve changes to your code. Here are some key points to help you decide when to migrate:

  1. Incremental Migration: You can migrate to Swift 6 incrementally, one module at a time. This means you don't need to wait for all your dependencies to migrate before you start (Platforms State of the Union).

  2. Compiler Diagnostics: The Swift 6 compiler diagnostics will guide you towards the places in your code that need fixing, helping you methodically eliminate data races (Migrate your app to Swift 6).

  3. Concurrency Improvements: If you are actively working on integrating more concurrency to improve responsiveness and performance, adopting Swift 6 mode can ensure that those changes don't risk introducing new data races (Migrate your app to Swift 6).

  4. Public Swift Packages: If you maintain a public Swift package, adopting Swift 6 as soon as possible can help your users who want to migrate their codebases (Migrate your app to Swift 6).

  5. Community Contribution: Every module that migrates to Swift 6 contributes to the community-wide transition to bring data race safety to the Swift software ecosystem. Updating your open-source packages to Swift 6 can help the broader community (Platforms State of the Union).

For a detailed step-by-step guide on how to migrate, you can refer to the session Migrate your app to Swift 6.