Proof

react-native-get-device-locale

native-seam only — upstream TurboModule/NativeModules selection and default-locale error handling run from the bundle; GetDeviceLocale returns the Intl locale in the package underscore format

90%

API coverage

No visual proof cases have been published for this package yet. The registry summary below describes what the compat layer implements.

Working

getDeviceLocale resolves values such as en_US

Missing

no per-app iOS language override beyond the browser Intl locale