Check: facebook/react-native#20774
If you get any file not found errors, and you're sure you could compile the project prior to upgrading to Xcode 10, try the following:
- Navigate to
node_modules/react-native/third-party/glog-0.3.4 - ../../scripts/ios-configure-glog.sh
- Under
Libraries(in workspace), selectRCTWebSocket.xcodeproj. - Remove and add back
libfishhook.aunderBuild Phases > Link Binary With Libraries.