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FAQ

Swift 6 compile error: function type mismatch … has_value (#718)

If Xcode fails with errors similar to function type mismatch, declared as '@convention(method) (__ObjC.std.__1.optional<>) -> Swift.Bool' and duplicate symbols for has_value, you are running into the Swift 6 compiler bug tracked in issue #718. The bug affects Apple toolchains shipped with Xcode 16.4 and earlier when compiling the generated Nitrogen bindings.

Recommended fix: upgrade to the latest Xcode (16.4 or newer). Apple resolved the problem in newer toolchains, so updating Xcode removes the duplicate symbol clash. After upgrading:

  1. Delete node_modules, ios/Pods, and the Xcode DerivedData folder.
  2. Reinstall dependencies (yarn install) and run pod install --clean-install inside ios.
  3. Build again with the updated Xcode.

Should problems persist after the upgrade, please attach your full build log and toolchain versions when commenting on the issue.