根据案例，通过create-react-native-app新建的项目启动报错

[jonerose]

错误信息如下：
15:54:29: Unable to start server
See https://git.io/v5vcn for more information, either install watchman or run the following snippet:
sudo sysctl -w kern.maxfiles=5242880
sudo sysctl -w kern.maxfilesperproc=524288

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my-app@0.1.0 ios: react-native-scripts ios
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the my-app@0.1.0 ios script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

有人遇到这问题吗？重新安装了依赖也不起作用

[cncolder]

如果是OSX, 最好是安装 watchman brew install watchman, create-react-app 需要这个监视文件改动, 如果没有的话会使用 node 自带的 fs 模块监视文件, 但是因为文件太多, 超过了系统允许的最大数量, 所以无法启动(Unable to start server)

错误信息中已经提醒你如果不想安装 watchman 可以改动系统参数, 但我记得重启就会失效.

sudo sysctl -w kern.maxfiles=5242880
sudo sysctl -w kern.maxfilesperproc=524288