[Rails] What to do if you get an error saying "Could not find a JavaScript runtime." When executing the rails s command on Catalina

error contents

Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)

approach

gem'therubyracer' is easy to get hooked on, so you should stop it. Install Node.js https://nodejs.org/en/

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