title: Utils package in Chart.js
body: <p>I'm trying reproducing this example from chart.js documentation:
  <a href="https://www.chartjs.org/docs/latest/samples/line/interpolation.html" rel="noreferrer">https://www.chartjs.org/docs/latest/samples/line/interpolation.html</a></p>
  <p>But I keep getting this error:</p>
  <blockquote>
  <p>Uncaught ReferenceError: Utils is not defined</p>
  </blockquote>
  <p>I tried searching for &quot;Utils&quot; in Chart.js documentation but with no success.
  Any idea how can I use it correctly? I'm obviously missing something basic.</p>