ReactNative报错Error watching file for changes: EMFILE

错误截图

RN项目之前一直运行OK,换了新的Mac,操作系统10.13.6,再次运行项目时报错。

该错误同样出现在升级Mac系统时。

原因:watchman需要重装
直接install watchman提示watchman已经安装,那就使用升级命令:brew upgrade watchman

➜  mywork brew install watchman
Error: watchman 4.9.0 is already installed
To upgrade to 4.9.0_2, run `brew upgrade watchman`
➜  mywork brew upgrade watchman

安装后,项目运行正常。

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