https://twitter.com/therealyashsriv/status/1219691914523545601

We shouldn't generate code that might cause browser or linting to complain.

https://github.com/facebook/react/blob/0cf22a56a18790ef34c71bef14f64695c0498619/packages/legacy-events/SyntheticEvent.js#L259

It's also just a confusing pattern at best.
const EventConstructor = this;
  invariant(
    event instanceof EventConstructor,
    'Trying to release an event instance into a pool of a different type.',
  );
  event.destructor();
  if (EventConstructor.eventPool.length < EVENT_POOL_SIZE) {
    EventConstructor.eventPool.push(event);
  }
}
function addEventPoolingTo(EventConstructor) {
  EventConstructor.getPooled = createOrGetPooledEvent;
  EventConstructor.eventPool = [];
  EventConstructor.release = releasePooledEvent;
}
export default SyntheticEvent;