title: How can I allow use es2018 regex in JavaScript/TypeScript in IDEA
body: <p>How can I allow to use es2018 regex in JavaScript/TypeScript in IntelliJ IDEA or disable this error notice only?</p>
  
  <p><code>(?&lt;=)</code> is es2018 look-behind</p>
  
  <p>I have tried adding <code>///&lt;reference lib="es2018.regexp"/&gt;</code> but this error notice still exists.</p>
  
  <ul>
  <li>IntelliJ IDEA/WebStorm is an IDE (can be used for JavaScript/TypeScript development)</li>
  <li>My env is Node.js 10 (support es2018.regexp)</li>
  <li>My script is run in Node.js, not browser</li>
  </ul>