Function addEvent

packages/react-aria/src/utils/domHelpers.ts:72–93

(
  target: T | EventTarget[] | null,
  event: Extract<K, string> | (string & {}),
  listener?: (this: T, ev: EventMapType<Exclude<T, null>>[K]) => any,
  options?: boolean | AddEventListenerOptions
)

 * Attaches an event listener on target(s) and returns a cleanup function.
 */
export function addEvent<T extends EventTarget, K extends keyof EventMapType<Exclude<T, null>>>(
  target: T | EventTarget[] | null,
  event: Extract<K, string> | (string & {}),
  listener?: (this: T, ev: EventMapType<Exclude<T, null>>[K]) => any,
  options?: boolean | AddEventListenerOptions
): () => void {
  if (listener == null || target == null) {
    return () => {};
  }

  let eventTargets = Array.isArray(target) ? target : [target];

  for (let eventTarget of eventTargets) {
    eventTarget.addEventListener(event, listener as EventListener, options);
  }

  return () => {
    for (let eventTarget of eventTargets) {
      eventTarget.removeEventListener(event, listener as EventListener, options);
    }
  };
}