text: /* eslint no-restricted-globals: 1 */
  /* eslint no-undef: 1 */
  // TODO: https://github.com/airbnb/javascript/issues/1632
  
  const ctx = self
  
  ctx.onmessage = ({ data: { message } }) => {
      setTimeout(() => ctx.postMessage({ message: `Received a ${message} and sending a Pong!` }), 1550)
  };
  