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Continuous integration for React Native should do more than run npm test.
A useful pipeline protects every pull request, builds signed release artifacts
from clean commits, keeps secrets out of the repository, and makes app store
submission repeatable.
Biometric authentication can make a React Native app feel faster and safer, but it should be designed as a local unlock step, not as a replacement for your account system. The device verifies the enrolled fingerprint or face; your app decides what to unlock after that verification succeeds.
Expo's expo-local-authentication package gives React Native apps access to
Face ID, Touch ID, Android Biometric Prompt, and device passcode fallback.