Missing official guide for safe migration of iOS projects from Objective-C to Swift

[coldSeattle]

Missing official guide for safe migration of iOS projects from Objective-C to Swift
Description
Many React Native apps that were created before RN 0.77 still use Objective-C in the iOS folder (AppDelegate, native modules, etc.).

Starting from RN 0.77+, the default iOS template switched to Swift with RCTAppDelegate, and RN 0.79 introduces Swift-friendly module registration via ios.modulesProvider.

However, there is no official documentation or migration guide that explains:

Whether developers should migrate their existing Obj-C iOS projects to Swift at all – is it optional, recommended for future compatibility, or required in upcoming releases?
How to do this migration safely, for example:
Converting AppDelegate from Obj-C to Swift (using RCTAppDelegate)
Handling projects that have a mix of Obj-C + Swift code (bridging-header best practices)
Migrating existing native modules (written in Obj-C) to the new Swift-friendly registration
Potential pitfalls with Pods, Xcode targets, build settings, deployment targets
Expected benefits vs. risks of migrating – maintenance, future upgrades, new architecture support.
At the moment, developers have to rely on Upgrade Helper diffs and community blog posts, which don’t provide a safe, step-by-step path for this transition.

Request
It would be extremely helpful if the React Native team could:

📘 Publish an official migration guide in the docs or blog for transitioning iOS projects from Obj-C to Swift.
❓ Clarify if / when Obj-C support might be deprecated so teams can plan accordingly.
💻 Provide sample code or templates for common scenarios:
Swift AppDelegate using RCTAppDelegate
Mixed Obj-C / Swift native modules
Bridging-header setup
⚠️ Highlight known pitfalls (Pods, build settings, deployment target changes).
Such guidance would save teams significant effort and reduce the risk of breaking changes during upgrades.

Environment
Current project: React Native 0.78 (iOS folder mostly Obj-C)
Target upgrade: React Native 0.79 (with Swift-friendly modules)
Xcode 15+, iOS 15+ deployment target
Project contains custom native modules written in Obj-C and plans to adopt Swift going forward.
Motivation
Upgrading from 0.78 → 0.79 leaves developers without a clear path for migrating the iOS folder to Swift.
An official guide would clarify whether migration is necessary, how to do it safely, and what benefits it brings.

[liamjones]

There was some info in the 0.77 release blog post re this: https://reactnative.dev/blog/2025/01/21/version-0.77#community-template-swift-as-programming-language-for-ios-apps