chromium/third_party/blink/web_tests/http/tests/worklet/resources/worklet-test-utils.js

// Returns a reference to a worklet object corresponding to a given type.
function get_worklet(type) {
  if (type == 'animation')
    return CSS.animationWorklet;
  if (type == 'layout')
    return CSS.layoutWorklet;
  if (type == 'paint')
    return CSS.paintWorklet;
  return undefined;
}