报错解决历程dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.64.dylib Referenced from: /...

我的解决办法是文章末尾的brew update && brew upgrade一行命令解决的，前边的可以跳过不看。
要解决的问题：

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执行brew upgrade npm

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没用！

继续......
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brew update
没用！

继续.......
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brew info icu4c

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然后
cd /usr/local/Cellar/icu4c/66.1/lib
cp ./libicui18n.66.dylib /usr/local/opt/icu4c/lib/
提示

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附注Linuxcp命令

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没用！

继续......
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brew reinstall yarn
有报错

Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink share/doc/node/gdbinit
Target /usr/local/share/doc/node/gdbinit
is a symlink belonging to node@12. You can unlink it:
  brew unlink node@12

如图

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然后1、rm -rf /usr/local/lib/node_modules/npm，再2、brew link node
在第二步报错

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然后我执行了brew unlink node@12
重新尝试brew link node，输出了Linking /usr/local/Cellar/node/14.3.0... 204 symlinks created
但，还是没有解决掉我的问题！

继续......
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brew update && brew upgrade

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庆祝
踏破铁鞋无觅处，蓦然回首，那人却在灯火阑珊处
兜兜转转，这一行命令就解决了问题