react-native项目启动报错 Error: `fsevents` unavailable (this watcher can only be used on Darwin)

react-native项目启动报错——watchman安装问题(mac pro)

 

Looking for JS files in
/Users/你的名称/Documents/project/文件夹名

Loading dependency graph.../Users/你的名称/Documents/project/文件夹名/node_modules/metro/node_modules/sane/src/fsevents_watcher.js:37
throw new Error(
^

Error: `fsevents` unavailable (this watcher can only be used on Darwin)

解决办法：

npm install -g fsevents
npm r -g watchman 
brew install watchman  
#第三步时间会很长，要安装许多软件
brew upgrade watchman

执行完之后再去执行 下面运行命令就可以了

npm run start