compile_glob

# 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