Function on

packages/rrweb/src/utils.ts:19–27

(
  type: string,
  fn: EventListenerOrEventListenerObject,
  target: Document | IWindow = document,
)

export { nowTimestamp } from '@rrweb/utils';

export function on(
  type: string,
  fn: EventListenerOrEventListenerObject,
  target: Document | IWindow = document,
): listenerHandler {
  const options = { capture: true, passive: true };
  target.addEventListener(type, fn, options);
  return () => target.removeEventListener(type, fn, options);
}

// https://github.com/rrweb-io/rrweb/pull/407
const DEPARTED_MIRROR_ACCESS_WARNING =