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0、在使用运行 react-native for ios 时，在终端可能遇到 ERROR watchman–no-pretty

1、查看watchman的版本时，可能会输出一下信息

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$ watchman --version
dyld: Library not loaded: /usr/local/opt/pcre/lib/libpcre.1.dylib
  Referenced from: /usr/local/Cellar/watchman/4.4.0/libexec/bin/watchman
  Reason: image not found
Trace/BPT trap: 5

2、使用brew软件安装watchman，可能会遇到一下信息

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$ brew install watchman
Error: You must `brew link pcre` before watchman can be installed

3、输入 brew link pcre，提示一下信息

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$ brew link pcre
Linking /usr/local/Cellar/pcre/8.38... 
Error: Could not symlink lib/libpcre.1.dylib
/usr/local/lib is not writable.

4、使用 brew doctor 命令，进行查错

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$ brew doctor //会提示错误信息
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry and just ignore them. Thanks!

5、输入以上的 Warning 提示

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$ sudo chown -R $(whoami) /usr/local/lib

6、安装 pcre ，pcre是 watchman 的依赖安装包

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$ brew link pcre
Linking /usr/local/Cellar/pcre/8.38... 133 symlinks created

7、再次安装 watchman，提示安装成功

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$ brew install watchman
==> Downloading https://homebrew.bintray.com/bottles/watchman-4.4.0.el_capitan.b
Already downloaded: /Library/Caches/Homebrew/watchman-4.4.0.el_capitan.bottle.tar.gz
==> Pouring watchman-4.4.0.el_capitan.bottle.tar.gz
🍺  /usr/local/Cellar/watchman/4.4.0: 20 files, 343.7K

参考资料

0、Brew error: Could not symlink, path is not writable

1、watchman : unknown option –no-pretty error while npm start

2、HomeBrew-Readme

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