title: How to use process.hrtime.bigint
body: <p>When I write </p>
  
  <pre><code>const a = process.hrtime.bigint();
  </code></pre>
  
  <p>Linting suggests that it is fine, but I see the compilation error </p>
  
  <pre><code>error TS2339: Property 'bigint' does not exist on type 'HRTime'.
  </code></pre>
  
  <p>Which seems peculiar when I read the docs
  <a href="https://nodejs.org/api/process.html" rel="nofollow noreferrer">https://nodejs.org/api/process.html</a>
  So how can I use bigint() in typescript? My node version is 10.16.2. I am at a loss to understand why typescript doesn't allow this. </p>