ReactNativeでキャッシュを綺麗にするコマンド

 watchman watch-del-all && rm -rf $TMPDIR/react-native-packager-cache-* && rm -rf $TMPDIR/metro-bundler-cache-* && rm -rf node_modules/ && yarn cache clean

react-native start --reset-cache

追記：

watchman watch-del-all && lsof -n -P -i :8081 -t | xargs kill && 
rm -rf $TMPDIR/metro-bundler-cache-* &&
rm -rf ~/Library/Developer/Xcode/DerivedData && 
sudo rm -rf '~/Library/Developer/Xcode/iOS\ DeviceSupport/*' && 
cd android && 
./gradlew clean cleanBuildCache && ./gradlew --stop &&
cd .. &&
rm -rf ios/build android/app/build ios/Pods node_modules