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    brew install nodeでの結果

    brew install node それでこれでた。

    Updating Homebrew...
    ==> Auto-updated Homebrew!
    Updated 1 tap (homebrew/core).
    ==> Updated Formulae
    Updated 1 formula.
    
    ==> Downloading https://homebrew.bintray.com/bottles/icu4c-67.1.big_sur.bottle.tar.gz
    ==> Downloading from https://d29vzk4ow07wi7.cloudfront.net/114cce72e22c5eb713f56b9f91a076b2f2d5930152d3638a95c6decee511aa3e?response-content-disposition=attachment%3Bfilename%3D%22icu4
    ######################################################################## 100.0%
    ==> Downloading https://homebrew.bintray.com/bottles/node-15.5.0.big_sur.bottle.tar.gz
    ==> Downloading from https://d29vzk4ow07wi7.cloudfront.net/05a1a6c4ac9994ab88fe176769d9f139cf5dc3a22a6a1f81a33cf805a5dfff52?response-content-disposition=attachment%3Bfilename%3D%22node
    ######################################################################## 100.0%
    ==> Installing dependencies for node: icu4c
    ==> Installing node dependency: icu4c
    ==> Pouring icu4c-67.1.big_sur.bottle.tar.gz
    ==> Caveats
    icu4c is keg-only, which means it was not symlinked into /usr/local,
    because macOS provides libicucore.dylib (but nothing else).
    
    If you need to have icu4c first in your PATH run:
      echo 'export PATH="/usr/local/opt/icu4c/bin:$PATH"' >> ~/.zshrc
      echo 'export PATH="/usr/local/opt/icu4c/sbin:$PATH"' >> ~/.zshrc
    
    For compilers to find icu4c you may need to set:
      export LDFLAGS="-L/usr/local/opt/icu4c/lib"
      export CPPFLAGS="-I/usr/local/opt/icu4c/include"
    
    For pkg-config to find icu4c you may need to set:
      export PKG_CONFIG_PATH="/usr/local/opt/icu4c/lib/pkgconfig"
    
    ==> Summary
    🍺  /usr/local/Cellar/icu4c/67.1: 258 files, 71.8MB
    ==> Installing node
    ==> Pouring node-15.5.0.big_sur.bottle.tar.gz
    🍺  /usr/local/Cellar/node/15.5.0: 3,291 files, 55.5MB
    ==> Caveats
    ==> icu4c
    icu4c is keg-only, which means it was not symlinked into /usr/local,
    because macOS provides libicucore.dylib (but nothing else).
    
    If you need to have icu4c first in your PATH run:
      echo 'export PATH="/usr/local/opt/icu4c/bin:$PATH"' >> ~/.zshrc
      echo 'export PATH="/usr/local/opt/icu4c/sbin:$PATH"' >> ~/.zshrc
    
    For compilers to find icu4c you may need to set:
      export LDFLAGS="-L/usr/local/opt/icu4c/lib"
      export CPPFLAGS="-I/usr/local/opt/icu4c/include"
    
    For pkg-config to find icu4c you may need to set:

    icu4cって? ICUはInternational Components for Unicodeの略で、その名の通りUnicodeに関するあれこれを扱ってくれるライブラリです。

    これでパス通しておけばいいのかも?

    echo 'export PATH="/usr/local/opt/icu4c/bin:$PATH"' >> ~/.zshrc
    echo 'export PATH="/usr/local/opt/icu4c/sbin:$PATH"' >> ~/.zshrc