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compile_glob(hash) private

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# File activesupport/lib/active_support/file_update_checker.rb, line 142
      def compile_glob(hash)
        hash.freeze # Freeze so changes aren't accidentally pushed
        return if hash.empty?

        globs = hash.map do |key, value|
          "#{escape(key)}/**/*#{compile_ext(value)}"
        end
        "{#{globs.join(",")}}"
      end
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