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rails s すると Could not find a JavaScript runtime

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#問題
rails s を実行すると

/Users/username/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/execjs-2.7.0/lib/execjs/runtimes.rb:58:in `autodetect': 
Could not find a JavaScript runtime.
https://github.com/rails/execjs for a list of available runtimes.

となり、実行できない

rubyからjavascriptを呼び出せていない

#解決
Gemfileにある

# gem 'therubyracer', platforms: :ruby

のコメントアウトを解除する。

therubyracerはjavascriptのv8エンジンを使用して、javascriptを有効にできるGem
therubyracer参考
v8エンジン参考

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