React Native Brownfield 3.10 integrates iOS prebuilts (available since React Native 0.83 and Expo 55) into the packaging pipeline, eliminating the need to compile React Native core from source on every build. The change involves conditional CocoaPods dependencies, Xcode build flag adjustments, @rpath install name fixes for Expo-generated frameworks, and interface-only helper frameworks to avoid duplicate symbol errors. Benchmarks across 10 runs show statistically significant build time reductions: up to 39% faster for Expo projects and ~11–29% for vanilla React Native apps. On RN 0.84+ and Expo 55+, prebuilts are enabled by default; RN 0.83 requires an explicit flag.
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What is packaged with Brownfield?Enabling prebuiltsWhat changed under the hoodAnalysis of build times before vs afterTry itConclusions845 Impressions