Understanding and comparing fingerprints in Expo apps
Blog post from Expo
Expo SDK 52 has introduced automatic fingerprinting for builds and updates, significantly enhancing compatibility between native code and the JavaScript bundle of an application. This feature is complemented by new CLI tools, eas fingerprint:generate and eas fingerprint:compare, which facilitate tracking changes in the native layer to prevent crashes due to mismatches. A fingerprint, a unique hash representing native dependencies, is automatically calculated during builds and updates, ensuring compatibility and preventing issues when JavaScript updates are incompatible with existing native binaries. The eas fingerprint:generate command allows developers to create and upload a fingerprint from their local project for easy access, while eas fingerprint:compare helps detect differences between builds or updates, simplifying debugging. These tools provide developers with increased insight and control over their app's native layer, reducing guesswork, improving stability, and enabling more confident updates, ensuring synchronization between JavaScript and native code and enhancing user experience.
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