React Native 0.84 makes Hermes V1 the default JavaScript engine, delivering automatic performance improvements and reduced memory usage. The release enables precompiled iOS binaries by default to speed up build times, continues removing Legacy Architecture code from both platforms, and requires Node.js 22.11 minimum. Additional

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Hermes V1 as Default ​Precompiled Binaries on iOS by Default ​Legacy Architecture Components Removed ​Node.js 22 Minimum ​Other Changes ​Deprecations ​Acknowledgements ​Upgrade to 0.84 ​

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