Function dispatchEvent

docs/index.js:17987–18070

(
  domEventName,
  eventSystemFlags,
  targetContainer,
  nativeEvent
)

  }
}
function dispatchEvent(
  domEventName,
  eventSystemFlags,
  targetContainer,
  nativeEvent
) {
  if (_enabled) {
    var blockedOn = findInstanceBlockingEvent(nativeEvent);
    if (null === blockedOn)
      dispatchEventForPluginEventSystem(
        domEventName,
        eventSystemFlags,
        nativeEvent,
        return_targetInst,
        targetContainer
      ),
        clearIfContinuousEvent(domEventName, nativeEvent);
    else if (
      queueIfContinuousEvent(
        blockedOn,
        domEventName,
        eventSystemFlags,
        targetContainer,
        nativeEvent
      )
    )
      nativeEvent.stopPropagation();
    else if (
      (clearIfContinuousEvent(domEventName, nativeEvent),
      eventSystemFlags & 4 &&
        -1 < discreteReplayableEvents.indexOf(domEventName))
    ) {
      for (; null !== blockedOn; ) {
        var fiber = getInstanceFromNode(blockedOn);
        if (null !== fiber)
          switch (fiber.tag) {
            case 3:
              fiber = fiber.stateNode;
              if (fiber.current.memoizedState.isDehydrated) {
                var lanes = getHighestPriorityLanes(fiber.pendingLanes);
                if (0 !== lanes) {
                  var root = fiber;
                  root.pendingLanes |= 2;
                  for (root.entangledLanes |= 2; lanes; ) {
                    var lane = 1 << (31 - clz32(lanes));
                    root.entanglements[1] |= lane;
                    lanes &= ~lane;
                  }
                  ensureRootIsScheduled(fiber);
                  0 === (executionContext & 6) &&
                    ((workInProgressRootRenderTargetTime = now() + 500),
                    flushSyncWorkAcrossRoots_impl(0, !1));
                }
              }
              break;
            case 13:
              (root = enqueueConcurrentRenderForLane(fiber, 2)),
                null !== root && scheduleUpdateOnFiber(root, fiber, 2),