title: How to print a red left middle bracket '[' in console in typescript?
body: <p>I want to print a red '[' in the option, but I face an error.</p>
  <pre><code>program
    .option('\x1b[31m--bcc [string]', 'bcc email address.');
  </code></pre>
  <p>When I remove the '[', it ran successfully. Does anyone know how to print it?</p>