It is a Jest-ism that shouldn't be in our open source package.
People using Jest can implement a similar pattern directly.
[DOMTopLevelEventTypes.TOP_RATE_CHANGE, 'rateChange'],
  [DOMTopLevelEventTypes.TOP_SCROLL, 'scroll'],
  [DOMTopLevelEventTypes.TOP_SEEKED, 'seeked'],
  [DOMTopLevelEventTypes.TOP_SEEKING, 'seeking'],
  [DOMTopLevelEventTypes.TOP_SELECTION_CHANGE, 'selectionChange'],
  [DOMTopLevelEventTypes.TOP_STALLED, 'stalled'],
  [DOMTopLevelEventTypes.TOP_SUSPEND, 'suspend'],
  [DOMTopLevelEventTypes.TOP_TEXT_INPUT, 'textInput'],
  [DOMTopLevelEventTypes.TOP_TIME_UPDATE, 'timeUpdate'],
  [DOMTopLevelEventTypes.TOP_TOGGLE, 'toggle'],
  [DOMTopLevelEventTypes.TOP_TOUCH_CANCEL, 'touchCancel'],
  [DOMTopLevelEventTypes.TOP_TOUCH_END, 'touchEnd'],
  [DOMTopLevelEventTypes.TOP_TOUCH_MOVE, 'touchMove'],
  [DOMTopLevelEventTypes.TOP_TOUCH_START, 'touchStart'],
  [DOMTopLevelEventTypes.TOP_TRANSITION_END, 'transitionEnd'],
  [DOMTopLevelEventTypes.TOP_VOLUME_CHANGE, 'volumeChange'],
  [DOMTopLevelEventTypes.TOP_WAITING, 'waiting'],
  [DOMTopLevelEventTypes.TOP_WHEEL, 'wheel'],
].forEach(([topLevelType, eventType]) => {
  /**
   * @param {!Element|ReactDOMComponent} domComponentOrNode
   * @param {?Event} nativeEventData Fake native event to use in SyntheticEvent.
   */
  ReactTestUtils.SimulateNative[eventType] = makeNativeSimulator(
    eventType,
    topLevelType,
  );
});
export default ReactTestUtils;