App ran fine on React Native 0.35.0. After updating to 0.40.0 via react-native-git-upgrade I get a number of lexical/preprocessor issues when trying to build/ru
react-native-git-upgrade
If you use pod, maybe you can try this solution:
Go to Header Search Paths: Pods -> TARGETS -> (YOUR TARGET, like my target is RNGL) -> Build Settings -> All -> Search Paths -> Header Search Paths
Pods -> TARGETS -> (YOUR TARGET, like my target is RNGL) -> Build Settings -> All -> Search Paths -> Header Search Paths
add a path: "${PODS_ROOT}/Headers/Public/React" non-recursive
"${PODS_ROOT}/Headers/Public/React"