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Hermes V1 as default Hermes V1 is now the default JavaScript engine on both iOS and Android, bringing improved execution speed and reduced memory usage. No migration required — if you're already using Hermes (the default since 0.70), you'll automatically get Hermes V1.

Precompiled binaries on iOS by default React Native 0.84 now ships precompiled binaries on iOS by default. No more compiling React Native core from source on every clean build. The precompiled .xcframework binaries are automatically downloaded during pod install.

Legacy Architecture removal continues Building on 0.82's work to make the New Architecture the only runtime option, React Native 0.84 removes more Legacy Architecture code from both iOS and Android — reducing build time and app size.