我的英语有点生疏，我很抱歉。
当我在 iOS 模拟器上启动 react-native 项目时出现错误。
为了排除与我的代码的任何冲突，我开始了一个新项目
react-native init demo
react-native start
react-native run-ios --simulator="iPhone 6"
现在是当我收到消息错误时
Loading dependency graph, done.
error: bundling failed: Error: Unable to resolve module `warnOnce` from `node_modules/react-native/Libraries/react-native/react-native-implementation.js`: warnOnce could not be found within the project.
If you are sure the module exists, try these steps:
1. Clear watchman watches: watchman watch-del-all
2. Delete node_modules: rm -rf node_modules and run yarn install
3. Reset Metro's cache: yarn start --reset-cache
4. Remove the cache: rm -rf /tmp/metro-* …