server.rb

    def start
      write_webpack_config
      stdin, stdout_and_stderr, _ = Open3.popen2e(webpack_command)

      begin
        Timeout::timeout(1) {
          while !stdout_and_stderr.eof?
            puts stdout_and_stderr.read_nonblock(128)
          end
        }
      rescue Timeout::Error
        Signal.trap("INT") { exit }
        retry
      end

    ensure
      stdin.close
      stdout_and_stderr.close
      File.delete config_path
    end